4coder/4ed_file_view.cpp

/*
 * Mr. 4th Dimention - Allen Webster
 *
 * 19.08.2015
 *
 * File editing view for 4coder
 *
 */

// TOP

enum Interactive_Action{
    IAct_Open,
    IAct_Save_As,
    IAct_New,
    IAct_Switch,
    IAct_Kill,
    IAct_Sure_To_Kill,
    IAct_Sure_To_Close
};

enum Interactive_Interaction{
    IInt_Sys_File_List,
    IInt_Live_File_List,
    IInt_Sure_To_Kill,
    IInt_Sure_To_Close
};

struct View_Mode{
    i32 rewrite;
};

enum View_Widget_Type{
    FWIDG_NONE,
    FWIDG_TIMELINES,
    // never below this
    FWIDG_TYPE_COUNT
};

struct View_Widget{
    UI_State state;
    View_Widget_Type type;
    i32 height_;
    struct{
        b32 undo_line;
        b32 history_line;
    } timeline;
};

enum View_UI{
    VUI_None,
    VUI_Theme,
    VUI_Interactive,
    VUI_Menu,
    VUI_Config,
};

enum Color_View_Mode{
    CV_Mode_Library,
    CV_Mode_Import_File,
    CV_Mode_Export_File,
    CV_Mode_Import,
    CV_Mode_Export,
    CV_Mode_Import_Wait,
    CV_Mode_Adjusting
};

struct View{
    View *next, *prev;
    b32 in_use;
    i32 id;

    Models *models;

    Panel *panel;
    Command_Map *map;

    Editing_File *file;

    UI_State ui_state;
    View_UI showing_ui;

    // interactive stuff
    Interactive_Interaction interaction;
    Interactive_Action action;
    b32 finished;
    char query_[256];
    char dest_[256];
    String query;
    String dest;
    i32 user_action;

    // theme stuff
    View *hot_file_view;
    u32 *palette;
    i32 palette_size;
    Color_View_Mode color_mode;
    Super_Color color;
    Color_Highlight highlight;
    b32 p4c_only;
    Style_Library inspecting_styles;
    b8 import_export_check[64];
    i32 import_file_id;

    // file stuff
    i32 font_advance;
    i32 font_height;

    Full_Cursor cursor;
    i32 mark;
    f32 scroll_y, target_y, prev_target_y;
    f32 scroll_x, target_x, prev_target_x;
    f32 preferred_x;
    i32 scroll_i;
    f32 scroll_min_limit;

    Full_Cursor temp_highlight;
    i32 temp_highlight_end_pos;
    b32 show_temp_highlight;

    View_Mode mode, next_mode;
    View_Widget widget;
    Query_Set query_set;
    i32 scrub_max;

    b32 unwrapped_lines;
    b32 show_whitespace;
    b32 file_locked;

    i32 line_count, line_max;
    f32 *line_wrap_y;

    Command_Map *map_for_file;
    b32 reinit_scrolling;
};

struct View_And_ID{
    View *view;
    i32 id;
};

#define LockLevel_Open 0
#define LockLevel_NoWrite 1
#define LockLevel_NoUpdate 2

inline i32
view_lock_level(View *view){
    i32 result = LockLevel_Open;
    if (view->showing_ui != VUI_None) result = LockLevel_NoUpdate;
    else if (view->file_locked ||
            (view->file && view->file->settings.read_only)) result = LockLevel_NoWrite;
    return(result);
}

inline f32
view_compute_width(View *view){
    Panel *panel = view->panel;
    return (f32)(panel->inner.x1 - panel->inner.x0);
}

inline f32
view_compute_height(View *view){
    Panel *panel = view->panel;
    return (f32)(panel->inner.y1 - panel->inner.y0);
}

struct View_Iter{
    View *view;

    Editing_File *file;
    View *skip;
    Panel *used_panels;
    Panel *panel;
};

internal View_Iter
file_view_iter_next(View_Iter iter){
    View *file_view;

    for (iter.panel = iter.panel->next; iter.panel != iter.used_panels; iter.panel = iter.panel->next){
        file_view = iter.panel->view;
        if (file_view != iter.skip && (file_view->file == iter.file || iter.file == 0)){
            iter.view = file_view;
            break;
        }
    }

    return(iter);
}

internal View_Iter
file_view_iter_init(Editing_Layout *layout, Editing_File *file, View *skip){
    View_Iter result;
    result.used_panels = &layout->used_sentinel;
    result.panel = result.used_panels;
    result.file = file;
    result.skip = skip;

    result = file_view_iter_next(result);

    return(result);
}

internal b32
file_view_iter_good(View_Iter iter){
    b32 result = (iter.panel != iter.used_panels);
    return(result);
}

inline b32
starts_new_line(u8 character){
    return (character == '\n');
}

inline void
file_init_strings(Editing_File *file){
    file->name.source_path = make_fixed_width_string(file->name.source_path_);
    file->name.live_name = make_fixed_width_string(file->name.live_name_);
    file->name.extension = make_fixed_width_string(file->name.extension_);
}

inline void
file_set_name(Working_Set *working_set, Editing_File *file, char *filename){
    String f, ext;

    Assert(file->name.live_name.str != 0);

    f = make_string_slowly(filename);
    copy_checked(&file->name.source_path, f);

    file->name.live_name.size = 0;
    get_front_of_directory(&file->name.live_name, f);

    if (file->name.source_path.size == file->name.live_name.size){
        file->name.extension.size = 0;
    }
    else{
        ext = file_extension(f);
        copy(&file->name.extension, ext);
    }

    {
        File_Node *node, *used_nodes;
        Editing_File *file_ptr;
        i32 file_x, original_len;
        b32 hit_conflict;

        used_nodes = &working_set->used_sentinel;
        original_len = file->name.live_name.size;
        hit_conflict = 1;
        file_x = 0;
        while (hit_conflict){
            hit_conflict = 0;
            for (dll_items(node, used_nodes)){
                file_ptr = (Editing_File*)node;
                if (file_ptr != file && file_is_ready(file_ptr)){
                    if (match(file->name.live_name, file_ptr->name.live_name)){
                        ++file_x;
                        hit_conflict = 1;
                        break;
                    }
                }
            }

            if (hit_conflict){
                file->name.live_name.size = original_len;
                append(&file->name.live_name, " <");
                append_int_to_str(file_x, &file->name.live_name);
                append(&file->name.live_name, ">");
            }
        }
    }
}

inline void
file_synchronize_times(System_Functions *system, Editing_File *file, char *filename){
    u64 stamp = system->file_time_stamp(filename);
    if (stamp > 0){
        file->state.last_4ed_write_time = stamp;
        file->state.last_4ed_edit_time = stamp;
        file->state.last_sys_write_time = stamp;
    }
    file->state.sync = buffer_get_sync(file);
}

internal i32
file_save(System_Functions *system, Exchange *exchange, Mem_Options *mem,
    Editing_File *file, char *filename){
    i32 result = 0;

    i32 max, size;
    b32 dos_write_mode = file->settings.dos_write_mode;
    char *data;
    Buffer_Type *buffer = &file->state.buffer;

    if (dos_write_mode)
        max = buffer_size(buffer) + buffer->line_count + 1;
    else
        max = buffer_size(buffer);

    data = (char*)general_memory_allocate(&mem->general, max, 0);
    Assert(data);

    if (dos_write_mode)
        size = buffer_convert_out(buffer, data, max);
    else
        buffer_stringify(buffer, 0, size = max, data);

    result = exchange_save_file(exchange, filename, str_size(filename), (byte*)data, size, max);

    if (result == 0){
        general_memory_free(&mem->general, data);
    }

    file_synchronize_times(system, file, filename);

    return(result);
}

inline b32
file_save_and_set_names(System_Functions *system, Exchange *exchange,
    Mem_Options *mem, Working_Set *working_set, Editing_File *file,
    char *filename){
    b32 result = 0;
    result = file_save(system, exchange, mem, file, filename);
    if (result){
        file_set_name(working_set, file, filename);
    }
    return result;
}

enum File_Bubble_Type{
    BUBBLE_BUFFER = 1,
    BUBBLE_STARTS,
    BUBBLE_WIDTHS,
    BUBBLE_WRAPS,
    BUBBLE_TOKENS,
    BUBBLE_UNDO_STRING,
    BUBBLE_UNDO,
    BUBBLE_UNDO_CHILDREN,
    //
    FILE_BUBBLE_TYPE_END,
};

#define GROW_FAILED 0
#define GROW_NOT_NEEDED 1
#define GROW_SUCCESS 2

internal i32
file_grow_starts_widths_as_needed(General_Memory *general, Buffer_Type *buffer, i32 additional_lines){
    b32 result = GROW_NOT_NEEDED;
    i32 max = buffer->line_max;
    i32 count = buffer->line_count;
    i32 target_lines = count + additional_lines;
    Assert(max == buffer->widths_max);

    if (target_lines > max || max == 0){
        max = LargeRoundUp(target_lines + max, Kbytes(1));

        f32 *new_widths = (f32*)general_memory_reallocate(
            general, buffer->line_widths,
            sizeof(f32)*count, sizeof(f32)*max, BUBBLE_WIDTHS);

        i32 *new_lines = (i32*)general_memory_reallocate(
            general, buffer->line_starts,
            sizeof(i32)*count, sizeof(i32)*max, BUBBLE_STARTS);

        if (new_lines){
            buffer->line_starts = new_lines;
            buffer->line_max = max;
        }
        if (new_widths){
            buffer->line_widths = new_widths;
            buffer->widths_max = max;
        }
        if (new_lines && new_widths){
            result = GROW_SUCCESS;
        }
        else{
            result = GROW_FAILED;
        }
    }

    return(result);
}

internal void
file_measure_starts_widths(System_Functions *system, General_Memory *general,
    Buffer_Type *buffer, float *advance_data){
    ProfileMomentFunction();
    if (!buffer->line_starts){
        i32 max = buffer->line_max = Kbytes(1);
        buffer->line_starts = (i32*)general_memory_allocate(general, max*sizeof(i32), BUBBLE_STARTS);
        TentativeAssert(buffer->line_starts);
        // TODO(allen): when unable to allocate?
    }
    if (!buffer->line_widths){
        i32 max = buffer->widths_max = Kbytes(1);
        buffer->line_widths = (f32*)general_memory_allocate(general, max*sizeof(f32), BUBBLE_STARTS);
        TentativeAssert(buffer->line_starts);
        // TODO(allen): when unable to allocate?
    }

    Buffer_Measure_Starts state = {};
    while (buffer_measure_starts_widths(&state, buffer, advance_data)){
        i32 count = state.count;
        i32 max = buffer->line_max;
        max = ((max + 1) << 1);

        {
            i32 *new_lines = (i32*)general_memory_reallocate(
                general, buffer->line_starts, sizeof(i32)*count, sizeof(i32)*max, BUBBLE_STARTS);

            // TODO(allen): when unable to grow?
            TentativeAssert(new_lines);
            buffer->line_starts = new_lines;
            buffer->line_max = max;
        }

        {
            f32 *new_lines = (f32*)
                general_memory_reallocate(general, buffer->line_widths,
                sizeof(f32)*count, sizeof(f32)*max, BUBBLE_WIDTHS);

            // TODO(allen): when unable to grow?
            TentativeAssert(new_lines);
            buffer->line_widths = new_lines;
            buffer->widths_max = max;
        }

    }
    buffer->line_count = state.count;
    buffer->widths_count = state.count;
}

struct Opaque_Font_Advance{
    void *data;
    int stride;
};

inline Opaque_Font_Advance
get_opaque_font_advance(Render_Font *font){
    Opaque_Font_Advance result;
    result.data = (char*)font->chardata + OffsetOfPtr(font->chardata, xadvance);
    result.stride = sizeof(*font->chardata);
    return result;
}

internal void
file_remeasure_widths_(System_Functions *system,
    General_Memory *general, Buffer_Type *buffer, Render_Font *font,
    i32 line_start, i32 line_end, i32 line_shift){
    ProfileMomentFunction();
    file_grow_starts_widths_as_needed(general, buffer, line_shift);
    buffer_remeasure_widths(buffer, font->advance_data, line_start, line_end, line_shift);
}

inline i32
view_wrapped_line_span(f32 line_width, f32 max_width){
    i32 line_count = CEIL32(line_width / max_width);
    if (line_count == 0) line_count = 1;
    return line_count;
}

internal i32
view_compute_lowest_line(View *view){
    i32 lowest_line = 0;
    i32 last_line = view->line_count - 1;
    if (last_line > 0){
        if (view->unwrapped_lines){
            lowest_line = last_line;
        }
        else{
            f32 wrap_y = view->line_wrap_y[last_line];
            lowest_line = FLOOR32(wrap_y / view->font_height);
            f32 max_width = view_compute_width(view);

            Editing_File *file = view->file;
            Assert(!file->state.is_dummy);
            f32 width = file->state.buffer.line_widths[last_line];
            i32 line_span = view_wrapped_line_span(width, max_width);
            lowest_line += line_span - 1;
        }
    }
    return lowest_line;
}

internal void
view_measure_wraps(System_Functions *system,
    General_Memory *general, View *view){
    ProfileMomentFunction();
    Buffer_Type *buffer;

    buffer = &view->file->state.buffer;
    i32 line_count = buffer->line_count;

    if (view->line_max < line_count){
        i32 max = view->line_max = LargeRoundUp(line_count, Kbytes(1));
        if (view->line_wrap_y){
            view->line_wrap_y = (real32*)
                general_memory_reallocate_nocopy(general, view->line_wrap_y, sizeof(real32)*max, BUBBLE_WRAPS);
        }
        else{
            view->line_wrap_y = (real32*)
                general_memory_allocate(general, sizeof(real32)*max, BUBBLE_WRAPS);
        }
    }

    f32 line_height = (f32)view->font_height;
    f32 max_width = view_compute_width(view);
    buffer_measure_wrap_y(buffer, view->line_wrap_y, line_height, max_width);

    view->line_count = line_count;
}

internal void*
alloc_for_buffer(void *context, int *size){
    *size = LargeRoundUp(*size, Kbytes(4));
    void *data = general_memory_allocate((General_Memory*)context, *size, BUBBLE_BUFFER);
    return data;
}

internal void
file_create_from_string(System_Functions *system, Models *models,
    Editing_File *file, char *filename, String val, b8 read_only = 0){

    Font_Set *font_set = models->font_set;
    Working_Set *working_set = &models->working_set;
    General_Memory *general = &models->mem.general;
    Partition *part = &models->mem.part;
    Buffer_Init_Type init;
    i32 page_size, scratch_size, init_success;

    file->state = {};

    init = buffer_begin_init(&file->state.buffer, val.str, val.size);
    for (; buffer_init_need_more(&init); ){
        page_size = buffer_init_page_size(&init);
        page_size = LargeRoundUp(page_size, Kbytes(4));
        if (page_size < Kbytes(4)) page_size = Kbytes(4);
        void *data = general_memory_allocate(general, page_size, BUBBLE_BUFFER);
        buffer_init_provide_page(&init, data, page_size);
    }

    scratch_size = partition_remaining(part);
    Assert(scratch_size > 0);
    init_success = buffer_end_init(&init, part->base + part->pos, scratch_size);
    AllowLocal(init_success);
    Assert(init_success);

    if (buffer_size(&file->state.buffer) < val.size){
        file->settings.dos_write_mode = 1;
    }

    file_init_strings(file);
    file_set_name(working_set, file, (char*)filename);

    file->state.font_id = models->global_font.font_id;

    file_synchronize_times(system, file, filename);

    Render_Font *font = get_font_info(font_set, file->state.font_id)->font;
    float *advance_data = 0;
    if (font) advance_data = font->advance_data;
    file_measure_starts_widths(system, general, &file->state.buffer, advance_data);

    file->settings.read_only = read_only;
    if (!read_only){
        i32 request_size = Kbytes(64);
        file->state.undo.undo.max = request_size;
        file->state.undo.undo.strings = (u8*)general_memory_allocate(general, request_size, BUBBLE_UNDO_STRING);
        file->state.undo.undo.edit_max = request_size / sizeof(Edit_Step);
        file->state.undo.undo.edits = (Edit_Step*)general_memory_allocate(general, request_size, BUBBLE_UNDO);

        file->state.undo.redo.max = request_size;
        file->state.undo.redo.strings = (u8*)general_memory_allocate(general, request_size, BUBBLE_UNDO_STRING);
        file->state.undo.redo.edit_max = request_size / sizeof(Edit_Step);
        file->state.undo.redo.edits = (Edit_Step*)general_memory_allocate(general, request_size, BUBBLE_UNDO);

        file->state.undo.history.max = request_size;
        file->state.undo.history.strings = (u8*)general_memory_allocate(general, request_size, BUBBLE_UNDO_STRING);
        file->state.undo.history.edit_max = request_size / sizeof(Edit_Step);
        file->state.undo.history.edits = (Edit_Step*)general_memory_allocate(general, request_size, BUBBLE_UNDO);

        file->state.undo.children.max = request_size;
        file->state.undo.children.strings = (u8*)general_memory_allocate(general, request_size, BUBBLE_UNDO_STRING);
        file->state.undo.children.edit_max = request_size / sizeof(Buffer_Edit);
        file->state.undo.children.edits = (Buffer_Edit*)general_memory_allocate(general, request_size, BUBBLE_UNDO);

        file->state.undo.history_block_count = 1;
        file->state.undo.history_head_block = 0;
        file->state.undo.current_block_normal = 1;
    }
}

internal b32
file_create_empty(System_Functions *system,
    Models *models, Editing_File *file, char *filename){

    file_create_from_string(system, models, file, filename, {});
    return (1);
}

internal b32
file_create_read_only(System_Functions *system,
    Models *models, Editing_File *file, char *filename){

    file_create_from_string(system, models, file, filename, {}, 1);
    return (1);
}

internal void
file_close(System_Functions *system, General_Memory *general, Editing_File *file){
    if (file->state.still_lexing){
        system->cancel_job(BACKGROUND_THREADS, file->state.lex_job);
        if (file->state.swap_stack.tokens){
            general_memory_free(general, file->state.swap_stack.tokens);
            file->state.swap_stack.tokens = 0;
        }
    }
    if (file->state.token_stack.tokens){
        general_memory_free(general, file->state.token_stack.tokens);
    }

    Buffer_Type *buffer = &file->state.buffer;
    if (buffer->data){
        general_memory_free(general, buffer->data);
        general_memory_free(general, buffer->line_starts);
        general_memory_free(general, buffer->line_widths);
    }

    if (file->state.undo.undo.edits){
        general_memory_free(general, file->state.undo.undo.strings);
        general_memory_free(general, file->state.undo.undo.edits);

        general_memory_free(general, file->state.undo.redo.strings);
        general_memory_free(general, file->state.undo.redo.edits);

        general_memory_free(general, file->state.undo.history.strings);
        general_memory_free(general, file->state.undo.history.edits);

        general_memory_free(general, file->state.undo.children.strings);
        general_memory_free(general, file->state.undo.children.edits);
    }
}

struct Shift_Information{
    i32 start, end, amount;
};

internal
Job_Callback_Sig(job_full_lex){
    Editing_File *file = (Editing_File*)data[0];
    General_Memory *general = (General_Memory*)data[1];

    Cpp_File cpp_file;
    cpp_file.data = file->state.buffer.data;
    cpp_file.size = file->state.buffer.size;

    Cpp_Token_Stack tokens;
    tokens.tokens = (Cpp_Token*)memory->data;
    tokens.max_count = memory->size / sizeof(Cpp_Token);
    tokens.count = 0;

    Cpp_Lex_Data status = cpp_lex_file_nonalloc(cpp_file, &tokens);

    while (!status.complete){
        system->grow_thread_memory(memory);
        tokens.tokens = (Cpp_Token*)memory->data;
        tokens.max_count = memory->size / sizeof(Cpp_Token);
        status = cpp_lex_file_nonalloc(cpp_file, &tokens, status);
    }

    i32 new_max = LargeRoundUp(tokens.count+1, Kbytes(1));

    system->acquire_lock(FRAME_LOCK);
    {
        Assert(file->state.swap_stack.tokens == 0);
        file->state.swap_stack.tokens = (Cpp_Token*)
            general_memory_allocate(general, new_max*sizeof(Cpp_Token), BUBBLE_TOKENS);
    }
    system->release_lock(FRAME_LOCK);

    u8 *dest = (u8*)file->state.swap_stack.tokens;
    u8 *src = (u8*)tokens.tokens;

    memcpy(dest, src, tokens.count*sizeof(Cpp_Token));

    system->acquire_lock(FRAME_LOCK);
    {
        file->state.token_stack.count = tokens.count;
        file->state.token_stack.max_count = new_max;
        if (file->state.token_stack.tokens)
            general_memory_free(general, file->state.token_stack.tokens);
        file->state.token_stack.tokens = file->state.swap_stack.tokens;
        file->state.swap_stack.tokens = 0;
    }
    system->release_lock(FRAME_LOCK);

    exchange->force_redraw = 1;

    // NOTE(allen): These are outside the locked section because I don't
    // think getting these out of order will cause critical bugs, and I
    // want to minimize what's done in locked sections.
    file->state.tokens_complete = 1;
    file->state.still_lexing = 0;
}


internal void
file_kill_tokens(System_Functions *system,
    General_Memory *general, Editing_File *file){
    file->settings.tokens_exist = 0;
    if (file->state.still_lexing){
        system->cancel_job(BACKGROUND_THREADS, file->state.lex_job);
        if (file->state.swap_stack.tokens){
            general_memory_free(general, file->state.swap_stack.tokens);
            file->state.swap_stack.tokens = 0;
        }
    }
    if (file->state.token_stack.tokens){
        general_memory_free(general, file->state.token_stack.tokens);
    }
    file->state.tokens_complete = 0;
    file->state.token_stack = {};
}

#if BUFFER_EXPERIMENT_SCALPEL <= 0
internal void
file_first_lex_parallel(System_Functions *system,
    General_Memory *general, Editing_File *file){
    file->settings.tokens_exist = 1;

    if (file->state.is_loading == 0 && file->state.still_lexing == 0){
        Assert(file->state.token_stack.tokens == 0);

        file->state.tokens_complete = 0;
        file->state.still_lexing = 1;

        Job_Data job;
        job.callback = job_full_lex;
        job.data[0] = file;
        job.data[1] = general;
        job.memory_request = Kbytes(64);
        file->state.lex_job = system->post_job(BACKGROUND_THREADS, job);
#endif
    }
}

internal void
file_relex_parallel(System_Functions *system,
    Mem_Options *mem, Editing_File *file,
    i32 start_i, i32 end_i, i32 amount){
    General_Memory *general = &mem->general;
    Partition *part = &mem->part;
    if (file->state.token_stack.tokens == 0){
        file_first_lex_parallel(system, general, file);
        return;
    }

    b32 inline_lex = !file->state.still_lexing;
    if (inline_lex){
        Cpp_File cpp_file;
        cpp_file.data = file->state.buffer.data;
        cpp_file.size = file->state.buffer.size;

        Cpp_Token_Stack *stack = &file->state.token_stack;

        Cpp_Relex_State state = 
            cpp_relex_nonalloc_start(cpp_file, stack,
            start_i, end_i, amount, 100);

        Temp_Memory temp = begin_temp_memory(part);
        i32 relex_end;
        Cpp_Token_Stack relex_space;
        relex_space.count = 0;
        relex_space.max_count = state.space_request;
        relex_space.tokens = push_array(part, Cpp_Token, relex_space.max_count);
        if (cpp_relex_nonalloc_main(&state, &relex_space, &relex_end)){
            inline_lex = 0;
        }
        else{
            i32 delete_amount = relex_end - state.start_token_i;
            i32 shift_amount = relex_space.count - delete_amount;

            if (shift_amount != 0){
                int new_count = stack->count + shift_amount;
                if (new_count > stack->max_count){
                    int new_max = LargeRoundUp(new_count, Kbytes(1));
                    stack->tokens = (Cpp_Token*)
                        general_memory_reallocate(general, stack->tokens,
                        stack->count*sizeof(Cpp_Token),
                        new_max*sizeof(Cpp_Token), BUBBLE_TOKENS);
                    stack->max_count = new_max;
                }

                int shift_size = stack->count - relex_end;
                if (shift_size > 0){
                    Cpp_Token *old_base = stack->tokens + relex_end;
                    memmove(old_base + shift_amount, old_base,
                        sizeof(Cpp_Token)*shift_size);
                }

                stack->count += shift_amount;
            }

            memcpy(state.stack->tokens + state.start_token_i, relex_space.tokens,
                sizeof(Cpp_Token)*relex_space.count);
        }

        end_temp_memory(temp);
    }

    if (!inline_lex){
        Cpp_Token_Stack *stack = &file->state.token_stack;
        Cpp_Get_Token_Result get_token_result = cpp_get_token(stack, end_i);
        i32 end_token_i = get_token_result.token_index;
        
        if (end_token_i < 0) end_token_i = 0;
        else if (end_i > stack->tokens[end_token_i].start) ++end_token_i;
        
        cpp_shift_token_starts(stack, end_token_i, amount);
        --end_token_i;
        if (end_token_i >= 0){
            Cpp_Token *token = stack->tokens + end_token_i;
            if (token->start < end_i && token->start + token->size > end_i){
                token->size += amount;
            }
        }

        file->state.still_lexing = 1;

        Job_Data job;
        job.callback = job_full_lex;
        job.data[0] = file;
        job.data[1] = general;
        job.memory_request = Kbytes(64);
        file->state.lex_job = system->post_job(BACKGROUND_THREADS, job);
    }
}

internal void
undo_stack_grow_string(General_Memory *general, Edit_Stack *stack, i32 extra_size){
    i32 old_max = stack->max;
    u8 *old_str = stack->strings;
    i32 new_max = old_max*2 + extra_size;
    u8 *new_str = (u8*)
        general_memory_reallocate(general, old_str, old_max, new_max);
    stack->strings = new_str;
    stack->max = new_max;
}

internal void
undo_stack_grow_edits(General_Memory *general, Edit_Stack *stack){
    i32 old_max = stack->edit_max;
    Edit_Step *old_eds = stack->edits;
    i32 new_max = old_max*2 + 2;
    Edit_Step *new_eds = (Edit_Step*)
        general_memory_reallocate(general, old_eds, old_max*sizeof(Edit_Step), new_max*sizeof(Edit_Step));
    stack->edits = new_eds;
    stack->edit_max = new_max;
}

internal void
child_stack_grow_string(General_Memory *general, Small_Edit_Stack *stack, i32 extra_size){
    i32 old_max = stack->max;
    u8 *old_str = stack->strings;
    i32 new_max = old_max*2 + extra_size;
    u8 *new_str = (u8*)
        general_memory_reallocate(general, old_str, old_max, new_max);
    stack->strings = new_str;
    stack->max = new_max;
}

internal void
child_stack_grow_edits(General_Memory *general, Small_Edit_Stack *stack, i32 amount){
    i32 old_max = stack->edit_max;
    Buffer_Edit *old_eds = stack->edits;
    i32 new_max = old_max*2 + amount;
    Buffer_Edit *new_eds = (Buffer_Edit*)
        general_memory_reallocate(general, old_eds, old_max*sizeof(Buffer_Edit), new_max*sizeof(Buffer_Edit));
    stack->edits = new_eds;
    stack->edit_max = new_max;
}

internal i32
undo_children_push(General_Memory *general, Small_Edit_Stack *children,
    Buffer_Edit *edits, i32 edit_count, u8 *strings, i32 string_size){
    i32 result = children->edit_count;
    if (children->edit_count + edit_count > children->edit_max)
        child_stack_grow_edits(general, children, edit_count);

    if (children->size + string_size > children->max)
        child_stack_grow_string(general, children, string_size);

    memcpy(children->edits + children->edit_count, edits, edit_count*sizeof(Buffer_Edit));
    memcpy(children->strings + children->size, strings, string_size);

    Buffer_Edit *edit = children->edits + children->edit_count;
    i32 start_pos = children->size;
    for (i32 i = 0; i < edit_count; ++i, ++edit){
        edit->str_start += start_pos;
    }

    children->edit_count += edit_count;
    children->size += string_size;

    return result;
}

struct Edit_Spec{
    u8 *str;
    Edit_Step step;
};

internal Edit_Step*
file_post_undo(General_Memory *general, Editing_File *file,
    Edit_Step step, bool32 do_merge, bool32 can_merge){
    if (step.type == ED_NORMAL){
        file->state.undo.redo.size = 0;
        file->state.undo.redo.edit_count = 0;
    }

    Edit_Stack *undo = &file->state.undo.undo;
    Edit_Step *result = 0;

    if (step.child_count == 0){
        if (step.edit.end - step.edit.start + undo->size > undo->max)
            undo_stack_grow_string(general, undo, step.edit.end - step.edit.start);

        Buffer_Edit inv;
        buffer_invert_edit(&file->state.buffer, step.edit, &inv,
            (char*)undo->strings, &undo->size, undo->max);

        Edit_Step inv_step = {};
        inv_step.edit = inv;
        inv_step.pre_pos = step.pre_pos;
        inv_step.post_pos = step.post_pos;
        inv_step.can_merge = (b8)can_merge;
        inv_step.type = ED_UNDO;

        bool32 did_merge = 0;
        if (do_merge && undo->edit_count > 0){
            Edit_Step prev = undo->edits[undo->edit_count-1];
            if (prev.can_merge && inv_step.edit.len == 0 && prev.edit.len == 0){
                if (prev.edit.end == inv_step.edit.start){
                    did_merge = 1;
                    inv_step.edit.start = prev.edit.start;
                    inv_step.pre_pos = prev.pre_pos;
                }
            }
        }

        if (did_merge){
            result = undo->edits + (undo->edit_count-1);
            *result = inv_step;
        }
        else{
            if (undo->edit_count == undo->edit_max)
                undo_stack_grow_edits(general, undo);
            result = undo->edits + (undo->edit_count++);
            *result = inv_step;
        }
    }
    else{
        Edit_Step inv_step = {};
        inv_step.type = ED_UNDO;
        inv_step.first_child = step.inverse_first_child;
        inv_step.inverse_first_child = step.first_child;
        inv_step.special_type = step.special_type;
        inv_step.child_count = step.inverse_child_count;
        inv_step.inverse_child_count = step.child_count;

        if (undo->edit_count == undo->edit_max)
            undo_stack_grow_edits(general, undo);
        result = undo->edits + (undo->edit_count++);
        *result = inv_step;
    }
    return result;
}

inline void
undo_stack_pop(Edit_Stack *stack){
    if (stack->edit_count > 0){
        Edit_Step *edit = stack->edits + (--stack->edit_count);
        stack->size -= edit->edit.len;
    }
}

internal void
file_post_redo(General_Memory *general, Editing_File *file, Edit_Step step){
    Edit_Stack *redo = &file->state.undo.redo;

    if (step.child_count == 0){
        if (step.edit.end - step.edit.start + redo->size > redo->max)
            undo_stack_grow_string(general, redo, step.edit.end - step.edit.start);

        Buffer_Edit inv;
        buffer_invert_edit(&file->state.buffer, step.edit, &inv,
            (char*)redo->strings, &redo->size, redo->max);

        Edit_Step inv_step = {};
        inv_step.edit = inv;
        inv_step.pre_pos = step.pre_pos;
        inv_step.post_pos = step.post_pos;
        inv_step.type = ED_REDO;

        if (redo->edit_count == redo->edit_max)
            undo_stack_grow_edits(general, redo);
        redo->edits[redo->edit_count++] = inv_step;
    }
    else{
        Edit_Step inv_step = {};
        inv_step.type = ED_REDO;
        inv_step.first_child = step.inverse_first_child;
        inv_step.inverse_first_child = step.first_child;
        inv_step.special_type = step.special_type;
        inv_step.child_count = step.inverse_child_count;
        inv_step.inverse_child_count = step.child_count;

        if (redo->edit_count == redo->edit_max)
            undo_stack_grow_edits(general, redo);
        redo->edits[redo->edit_count++] = inv_step;
    }
}

inline void
file_post_history_block(Editing_File *file, i32 pos){
    Assert(file->state.undo.history_head_block < pos);
    Assert(pos < file->state.undo.history.edit_count);

    Edit_Step *history = file->state.undo.history.edits;
    Edit_Step *step = history + file->state.undo.history_head_block;
    step->next_block = pos;
    step = history + pos;
    step->prev_block = file->state.undo.history_head_block;
    file->state.undo.history_head_block = pos;
    ++file->state.undo.history_block_count;
}

inline void
file_unpost_history_block(Editing_File *file){
    Assert(file->state.undo.history_block_count > 1);
    --file->state.undo.history_block_count;
    Edit_Step *old_head = file->state.undo.history.edits + file->state.undo.history_head_block;
    file->state.undo.history_head_block = old_head->prev_block;
}

internal Edit_Step*
file_post_history(General_Memory *general, Editing_File *file,
    Edit_Step step, b32 do_merge, b32 can_merge){
    Edit_Stack *history = &file->state.undo.history;
    Edit_Step *result = 0;

    persist Edit_Type reverse_types[4];
    if (reverse_types[ED_UNDO] == 0){
        reverse_types[ED_NORMAL] = ED_REVERSE_NORMAL;
        reverse_types[ED_REVERSE_NORMAL] = ED_NORMAL;
        reverse_types[ED_UNDO] = ED_REDO;
        reverse_types[ED_REDO] = ED_UNDO;
    }

    if (step.child_count == 0){
        if (step.edit.end - step.edit.start + history->size > history->max)
            undo_stack_grow_string(general, history, step.edit.end - step.edit.start);

        Buffer_Edit inv;
        buffer_invert_edit(&file->state.buffer, step.edit, &inv,
            (char*)history->strings, &history->size, history->max);

        Edit_Step inv_step = {};
        inv_step.edit = inv;
        inv_step.pre_pos = step.pre_pos;
        inv_step.post_pos = step.post_pos;
        inv_step.can_merge = (b8)can_merge;
        inv_step.type = reverse_types[step.type];

        bool32 did_merge = 0;
        if (do_merge && history->edit_count > 0){
            Edit_Step prev = history->edits[history->edit_count-1];
            if (prev.can_merge && inv_step.edit.len == 0 && prev.edit.len == 0){
                if (prev.edit.end == inv_step.edit.start){
                    did_merge = 1;
                    inv_step.edit.start = prev.edit.start;
                    inv_step.pre_pos = prev.pre_pos;
                }
            }
        }

        if (did_merge){
            result = history->edits + (history->edit_count-1);
        }
        else{
            if (history->edit_count == history->edit_max)
                undo_stack_grow_edits(general, history);
            result = history->edits + (history->edit_count++);
        }

        *result = inv_step;
    }
    else{
        Edit_Step inv_step = {};
        inv_step.type = reverse_types[step.type];
        inv_step.first_child = step.inverse_first_child;
        inv_step.inverse_first_child = step.first_child;
        inv_step.special_type = step.special_type;
        inv_step.inverse_child_count = step.child_count;
        inv_step.child_count = step.inverse_child_count;

        if (history->edit_count == history->edit_max)
            undo_stack_grow_edits(general, history);
        result = history->edits + (history->edit_count++);
        *result = inv_step;
    }

    return result;
}

inline Full_Cursor
view_compute_cursor_from_pos(View *view, i32 pos){
    Editing_File *file = view->file;
    Models *models = view->models;
    Render_Font *font = get_font_info(models->font_set, models->global_font.font_id)->font;

    Full_Cursor result = {};
    if (font){
        f32 max_width = view_compute_width(view);
        result = buffer_cursor_from_pos(&file->state.buffer, pos, view->line_wrap_y,
            max_width, (f32)view->font_height, font->advance_data);
    }
    return result;
}

inline Full_Cursor
view_compute_cursor_from_unwrapped_xy(View *view, f32 seek_x, f32 seek_y, b32 round_down = 0){
    Editing_File *file = view->file;
    Models *models = view->models;
    Render_Font *font = get_font_info(models->font_set, models->global_font.font_id)->font;

    Full_Cursor result = {};
    if (font){
        f32 max_width = view_compute_width(view);
        result = buffer_cursor_from_unwrapped_xy(&file->state.buffer, seek_x, seek_y,
            round_down, view->line_wrap_y,
            max_width, (f32)view->font_height, font->advance_data);
    }

    return result;
}

internal Full_Cursor
view_compute_cursor_from_wrapped_xy(View *view, f32 seek_x, f32 seek_y, b32 round_down = 0){
    Editing_File *file = view->file;
    Models *models = view->models;
    Render_Font *font = get_font_info(models->font_set, models->global_font.font_id)->font;

    Full_Cursor result = {};
    if (font){
        f32 max_width = view_compute_width(view);
        result = buffer_cursor_from_wrapped_xy(&file->state.buffer, seek_x, seek_y,
            round_down, view->line_wrap_y,
            max_width, (f32)view->font_height, font->advance_data);
    }

    return (result);
}

internal Full_Cursor
view_compute_cursor_from_line_pos(View *view, i32 line, i32 pos){
    Editing_File *file = view->file;
    Models *models = view->models;
    Render_Font *font = get_font_info(models->font_set, models->global_font.font_id)->font;

    Full_Cursor result = {};
    if (font){
        f32 max_width = view_compute_width(view);
        result = buffer_cursor_from_line_character(&file->state.buffer, line, pos,
            view->line_wrap_y, max_width, (f32)view->font_height, font->advance_data);
    }

    return (result);
}

inline Full_Cursor
view_compute_cursor(View *view, Buffer_Seek seek){
    Full_Cursor result = {};

    switch(seek.type){
        case buffer_seek_pos:
        result = view_compute_cursor_from_pos(view, seek.pos);
        break;

        case buffer_seek_wrapped_xy:
        result = view_compute_cursor_from_wrapped_xy(view, seek.x, seek.y);
        break;

        case buffer_seek_unwrapped_xy:
        result = view_compute_cursor_from_unwrapped_xy(view, seek.x, seek.y);
        break;

        case buffer_seek_line_char:
        result = view_compute_cursor_from_line_pos(view, seek.line, seek.character);
        break;
    }

    return (result);
}

inline Full_Cursor
view_compute_cursor_from_xy(View *view, f32 seek_x, f32 seek_y){
    Full_Cursor result;
    if (view->unwrapped_lines) result = view_compute_cursor_from_unwrapped_xy(view, seek_x, seek_y);
    else result = view_compute_cursor_from_wrapped_xy(view, seek_x, seek_y);
    return result;
}

inline void
view_set_temp_highlight(View *view, i32 pos, i32 end_pos){
    view->temp_highlight = view_compute_cursor_from_pos(view, pos);
    view->temp_highlight_end_pos = end_pos;
    view->show_temp_highlight = 1;
}

inline i32
view_get_cursor_pos(View *view){
    i32 result;
    if (view->show_temp_highlight){
        result = view->temp_highlight.pos;
    }
    else{
        result = view->cursor.pos;
    }
    return result;
}

inline f32
view_get_cursor_x(View *view){
    f32 result;
    Full_Cursor *cursor;
    if (view->show_temp_highlight){
        cursor = &view->temp_highlight;
    }
    else{
        cursor = &view->cursor;
    }
    if (view->unwrapped_lines){
        result = cursor->unwrapped_x;
    }
    else{
        result = cursor->wrapped_x;
    }
    return result;
}

inline f32
view_get_cursor_y(View *view){
    Full_Cursor *cursor;
    f32 result;

    if (view->show_temp_highlight) cursor = &view->temp_highlight;
    else cursor = &view->cursor;

    if (view->unwrapped_lines) result = cursor->unwrapped_y;
    else result = cursor->wrapped_y;

    return result;
}

internal void
view_set_file(
    // NOTE(allen): These parameters are always meaningful
    View *view, Editing_File *file, Models *models,

    // NOTE(allen): Necessary when file != 0
    System_Functions *system, Hook_Function *open_hook, Application_Links *app,

    // other
    b32 set_vui = 1){

    Font_Info *fnt_info;

    // TODO(allen): This belongs somewhere else.
    fnt_info = get_font_info(models->font_set, models->global_font.font_id);
    view->font_advance = fnt_info->advance;
    view->font_height = fnt_info->height;

    // NOTE(allen): Stuff that doesn't assume file exists.
    view->file = file;
    view->cursor = {};

    // NOTE(allen): Stuff that does assume file exists.
    if (file){
        //view->locked = file->settings.super_locked;
        view->unwrapped_lines = file->settings.unwrapped_lines;

        if (file_is_ready(file)){
            view_measure_wraps(system, &models->mem.general, view);
            view->cursor = view_compute_cursor_from_pos(view, file->state.cursor_pos);
            view->reinit_scrolling = 1;
        }
    }

    // TODO(allen): Bypass all this nonsense, it's a hack!  Hooks need parameters!
    // Just accept it and pass the file to the open hook when it is loaded.
    if (file){
        if (open_hook && file->settings.is_initialized == 0){
            models->buffer_param_indices[models->buffer_param_count++] = file->id.id;
            open_hook(app);
            models->buffer_param_count = 0;
            file->settings.is_initialized = 1;
        }
    }

    if (set_vui){
        // TODO(allen): Fix this! There should be a way to easily separate setting a file,
        // and switching to file mode, so that they don't cross over eachother like this.
        view->ui_state = {};
        view->showing_ui = VUI_None;
    }
}

struct Relative_Scrolling{
    f32 scroll_x, scroll_y;
    f32 target_x, target_y;
    f32 scroll_min_limit;
};

internal Relative_Scrolling
view_get_relative_scrolling(View *view){
    Relative_Scrolling result;
    f32 cursor_y;
    cursor_y = view_get_cursor_y(view);
    result.scroll_y = cursor_y - view->scroll_y;
    result.target_y = cursor_y - view->target_y;
    result.scroll_min_limit = view->scroll_min_limit;
    return result;
}

internal void
view_set_relative_scrolling(View *view, Relative_Scrolling scrolling){
    f32 cursor_y;
    cursor_y = view_get_cursor_y(view);
    view->scroll_y = cursor_y - scrolling.scroll_y;
    view->target_y = cursor_y - scrolling.target_y;
    if (view->target_y < scrolling.scroll_min_limit) view->target_y = scrolling.scroll_min_limit;
}

inline void
view_cursor_move(View *view, Full_Cursor cursor){
    view->cursor = cursor;
    view->preferred_x = view_get_cursor_x(view);
    view->file->state.cursor_pos = view->cursor.pos;
    view->show_temp_highlight = 0;
}

inline void
view_cursor_move(View *view, i32 pos){
    Full_Cursor cursor = view_compute_cursor_from_pos(view, pos);
    view_cursor_move(view, cursor);
}

inline void
view_cursor_move(View *view, f32 x, f32 y, b32 round_down = 0){
    Full_Cursor cursor;
    if (view->unwrapped_lines){
        cursor = view_compute_cursor_from_unwrapped_xy(view, x, y, round_down);
    }
    else{
        cursor = view_compute_cursor_from_wrapped_xy(view, x, y, round_down);
    }
    view_cursor_move(view, cursor);
}

inline void
view_cursor_move(View *view, i32 line, i32 pos){
    Full_Cursor cursor = view_compute_cursor_from_line_pos(view, line, pos);
    view_cursor_move(view, cursor);
}

inline void
view_set_widget(View *view, View_Widget_Type type){
    view->widget.type = type;
}


inline i32_Rect
view_widget_rect(View *view, i32 font_height){
    Panel *panel = view->panel;
    i32_Rect result = panel->inner;

    if (view->file){
        result.y0 = result.y0 + font_height + 2;
    }

    return(result);
}

enum History_Mode{
    hist_normal,
    hist_backward,
    hist_forward
};

internal void
file_update_history_before_edit(Mem_Options *mem, Editing_File *file, Edit_Step step, u8 *str,
    History_Mode history_mode){
    if (!file->state.undo.undo.edits) return;
    General_Memory *general = &mem->general;

    b32 can_merge = 0, do_merge = 0;
    switch (step.type){
        case ED_NORMAL:
        {
            if (step.edit.len == 1 && str && char_is_alpha_numeric(*str)) can_merge = 1;
            if (step.edit.len == 1 && str && (can_merge || char_is_whitespace(*str))) do_merge = 1;

            if (history_mode != hist_forward)
                file_post_history(general, file, step, do_merge, can_merge);

            file_post_undo(general, file, step, do_merge, can_merge);
        }break;

        case ED_REVERSE_NORMAL:
        {
            if (history_mode != hist_forward)
                file_post_history(general, file, step, do_merge, can_merge);

            undo_stack_pop(&file->state.undo.undo);

            b32 restore_redos = 0;
            Edit_Step *redo_end = 0;

            if (history_mode == hist_backward && file->state.undo.edit_history_cursor > 0){
                restore_redos = 1;
                redo_end = file->state.undo.history.edits + (file->state.undo.edit_history_cursor - 1);
            }
            else if (history_mode == hist_forward && file->state.undo.history.edit_count > 0){
                restore_redos = 1;
                redo_end = file->state.undo.history.edits + (file->state.undo.history.edit_count - 1);
            }

            if (restore_redos){
                Edit_Step *redo_start = redo_end;
                i32 steps_of_redo = 0;
                i32 strings_of_redo = 0;
                i32 undo_count = 0;
                while (redo_start->type == ED_REDO || redo_start->type == ED_UNDO){
                    if (redo_start->type == ED_REDO){
                        if (undo_count > 0) --undo_count;
                        else{
                            ++steps_of_redo;
                            strings_of_redo += redo_start->edit.len;
                        }
                    }
                    else{
                        ++undo_count;
                    }
                    --redo_start;
                }

                if (redo_start < redo_end){
                    ++redo_start;
                    ++redo_end;

                    if (file->state.undo.redo.edit_count + steps_of_redo > file->state.undo.redo.edit_max)
                        undo_stack_grow_edits(general, &file->state.undo.redo);

                    if (file->state.undo.redo.size + strings_of_redo > file->state.undo.redo.max)
                        undo_stack_grow_string(general, &file->state.undo.redo, strings_of_redo);

                    u8 *str_src = file->state.undo.history.strings + redo_end->edit.str_start;
                    u8 *str_dest_base = file->state.undo.redo.strings;
                    i32 str_redo_pos = file->state.undo.redo.size + strings_of_redo;

                    Edit_Step *edit_src = redo_end;
                    Edit_Step *edit_dest =
                        file->state.undo.redo.edits + file->state.undo.redo.edit_count + steps_of_redo;

                    i32 undo_count = 0;
                    for (i32 i = 0; i < steps_of_redo;){
                        --edit_src;
                        str_src -= edit_src->edit.len;
                        if (edit_src->type == ED_REDO){
                            if (undo_count > 0){
                                --undo_count;
                            }
                            else{
                                ++i;

                                --edit_dest;
                                *edit_dest = *edit_src;

                                str_redo_pos -= edit_dest->edit.len;
                                edit_dest->edit.str_start = str_redo_pos;

                                memcpy(str_dest_base + str_redo_pos, str_src, edit_dest->edit.len);
                            }
                        }
                        else{
                            ++undo_count;
                        }
                    }
                    Assert(undo_count == 0);

                    file->state.undo.redo.size += strings_of_redo;
                    file->state.undo.redo.edit_count += steps_of_redo;
                }
            }
        }break;

        case ED_UNDO:
        {
            if (history_mode != hist_forward)
                file_post_history(general, file, step, do_merge, can_merge);
            file_post_redo(general, file, step);
            undo_stack_pop(&file->state.undo.undo);
        }break;

        case ED_REDO:
        {
            if (step.edit.len == 1 && str && char_is_alpha_numeric(*str)) can_merge = 1;
            if (step.edit.len == 1 && str && (can_merge || char_is_whitespace(*str))) do_merge = 1;

            if (history_mode != hist_forward)
                file_post_history(general, file, step, do_merge, can_merge);

            file_post_undo(general, file, step, do_merge, can_merge);
            undo_stack_pop(&file->state.undo.redo);
        }break;
    }

    if (history_mode != hist_forward){
        if (step.type == ED_UNDO || step.type == ED_REDO){
            if (file->state.undo.current_block_normal){
                file_post_history_block(file, file->state.undo.history.edit_count - 1);
                file->state.undo.current_block_normal = 0;
            }
        }
        else{
            if (!file->state.undo.current_block_normal){
                file_post_history_block(file, file->state.undo.history.edit_count - 1);
                file->state.undo.current_block_normal = 1;
            }
        }
    }
    else{
        if (file->state.undo.history_head_block == file->state.undo.history.edit_count){
            file_unpost_history_block(file);
            file->state.undo.current_block_normal = !file->state.undo.current_block_normal;
        }
    }

    if (history_mode == hist_normal){
        file->state.undo.edit_history_cursor = file->state.undo.history.edit_count;
    }
}

inline void
file_pre_edit_maintenance(System_Functions *system,
    General_Memory *general,
    Editing_File *file){
    if (file->state.still_lexing){
        system->cancel_job(BACKGROUND_THREADS, file->state.lex_job);
        if (file->state.swap_stack.tokens){
            general_memory_free(general, file->state.swap_stack.tokens);
            file->state.swap_stack.tokens = 0;
        }
    }
    file->state.last_4ed_edit_time = system->time();
}

struct Cursor_Fix_Descriptor{
    b32 is_batch;
    union{
        struct{
            Buffer_Edit *batch;
            i32 batch_size;
        };
        struct{
            i32 start, end;
            i32 shift_amount;
        };
    };
};

internal void
file_edit_cursor_fix(System_Functions *system,
    Partition *part, General_Memory *general,
    Editing_File *file, Editing_Layout *layout,
    Cursor_Fix_Descriptor desc){

    Full_Cursor temp_cursor;
    Temp_Memory cursor_temp = begin_temp_memory(part);
    i32 cursor_max = layout->panel_max_count * 2;
    Cursor_With_Index *cursors = push_array(part, Cursor_With_Index, cursor_max);

    f32 y_offset = 0, y_position = 0;
    i32 cursor_count = 0;

    View *view;
    Panel *panel, *used_panels;
    used_panels = &layout->used_sentinel;

    for (dll_items(panel, used_panels)){
        view = panel->view;
        if (view->file == file){
            view_measure_wraps(system, general, view);
            write_cursor_with_index(cursors, &cursor_count, view->cursor.pos);
            write_cursor_with_index(cursors, &cursor_count, view->mark - 1);
            write_cursor_with_index(cursors, &cursor_count, view->scroll_i - 1);
        }
    }

    if (cursor_count > 0){
        buffer_sort_cursors(cursors, cursor_count);
        if (desc.is_batch){
            buffer_batch_edit_update_cursors(cursors, cursor_count,
                desc.batch, desc.batch_size);
        }
        else{
            buffer_update_cursors(cursors, cursor_count,
                desc.start, desc.end,
                desc.shift_amount + (desc.end - desc.start));
        }
        buffer_unsort_cursors(cursors, cursor_count);

        cursor_count = 0;
        for (dll_items(panel, used_panels)){
            view = panel->view;
            if (view && view->file == file){
                view_cursor_move(view, cursors[cursor_count++].pos);
                view->preferred_x = view_get_cursor_x(view);

                view->mark = cursors[cursor_count++].pos + 1;
                i32 new_scroll_i = cursors[cursor_count++].pos + 1;
                if (view->scroll_i != new_scroll_i){
                    view->scroll_i = new_scroll_i;
                    temp_cursor = view_compute_cursor_from_pos(view, view->scroll_i);
                    y_offset = MOD(view->scroll_y, view->font_height);

                    if (view->unwrapped_lines){
                        y_position = temp_cursor.unwrapped_y + y_offset;
                        view->target_y += (y_position - view->scroll_y);
                        view->scroll_y = y_position;
                    }
                    else{
                        y_position = temp_cursor.wrapped_y + y_offset;
                        view->target_y += (y_position - view->scroll_y);
                        view->scroll_y = y_position;
                    }
                }
            }
        }
    }

    end_temp_memory(cursor_temp);
}

internal void
file_do_single_edit(System_Functions *system,
    Models *models, Editing_File *file,
    Edit_Spec spec, History_Mode history_mode, b32 use_high_permission = 0){
    ProfileMomentFunction();
    if (!use_high_permission && file->settings.read_only) return;

    Mem_Options *mem = &models->mem;
    Editing_Layout *layout = &models->layout;

    // NOTE(allen): fixing stuff beforewards????
    file_update_history_before_edit(mem, file, spec.step, spec.str, history_mode);
    file_pre_edit_maintenance(system, &mem->general, file);

    // NOTE(allen): actual text replacement
    i32 shift_amount = 0;
    General_Memory *general = &mem->general;
    Partition *part = &mem->part;

    char *str = (char*)spec.str;
    i32 start = spec.step.edit.start;
    i32 end = spec.step.edit.end;
    i32 str_len = spec.step.edit.len;

    i32 scratch_size = partition_remaining(part);

    Assert(scratch_size > 0);
    i32 request_amount = 0;
    while (buffer_replace_range(&file->state.buffer, start, end, str, str_len, &shift_amount,
            part->base + part->pos, scratch_size, &request_amount)){
        void *new_data = 0;
        if (request_amount > 0){
            new_data = general_memory_allocate(general, request_amount, BUBBLE_BUFFER);
        }
        void *old_data = buffer_edit_provide_memory(&file->state.buffer, new_data, request_amount);
        if (old_data) general_memory_free(general, old_data);
    }

    Buffer_Type *buffer = &file->state.buffer;
    i32 line_start = buffer_get_line_index(&file->state.buffer, start);
    i32 line_end = buffer_get_line_index(&file->state.buffer, end);
    i32 replaced_line_count = line_end - line_start;
    i32 new_line_count = buffer_count_newlines(&file->state.buffer, start, start+str_len);
    i32 line_shift =  new_line_count - replaced_line_count;

    Render_Font *font = get_font_info(models->font_set, file->state.font_id)->font;

    file_grow_starts_widths_as_needed(general, buffer, line_shift);
    buffer_remeasure_starts(buffer, line_start, line_end, line_shift, shift_amount);
    buffer_remeasure_widths(buffer, font->advance_data, line_start, line_end, line_shift);

    Panel *panel, *used_panels;
    used_panels = &layout->used_sentinel;

    for (dll_items(panel, used_panels)){
        View *view = panel->view;
        if (view->file == file){
            view_measure_wraps(system, general, view);
        }
    }

#if BUFFER_EXPERIMENT_SCALPEL <= 0
    // NOTE(allen): fixing stuff afterwards
    if (file->settings.tokens_exist)
        file_relex_parallel(system, mem, file, start, end, shift_amount);
#endif

    Cursor_Fix_Descriptor desc = {};
    desc.start = start;
    desc.end = end;
    desc.shift_amount = shift_amount;

    file_edit_cursor_fix(system, part, general,
        file, layout, desc);
}

internal void
file_do_white_batch_edit(System_Functions *system, Models *models, Editing_File *file,
    Edit_Spec spec, History_Mode history_mode, b32 use_high_permission = 0){
    ProfileMomentFunction();
    if (!use_high_permission && file->settings.read_only) return;

    Mem_Options *mem = &models->mem;
    Editing_Layout *layout = &models->layout;

    // NOTE(allen): fixing stuff "beforewards"???    
    Assert(spec.str == 0);
    file_update_history_before_edit(mem, file, spec.step, 0, history_mode);
    file_pre_edit_maintenance(system, &mem->general, file);

    // NOTE(allen): actual text replacement
    General_Memory *general = &mem->general;
    Partition *part = &mem->part;

    u8 *str_base = file->state.undo.children.strings;
    i32 batch_size = spec.step.child_count;
    Buffer_Edit *batch = file->state.undo.children.edits + spec.step.first_child;

    Assert(spec.step.first_child < file->state.undo.children.edit_count);
    Assert(batch_size >= 0);

    i32 scratch_size = partition_remaining(part);
    Buffer_Batch_State state = {};
    i32 request_amount;
    while (buffer_batch_edit_step(&state, &file->state.buffer, batch,
            (char*)str_base, batch_size, part->base + part->pos,
            scratch_size, &request_amount)){
        void *new_data = 0;
        if (request_amount > 0){
            new_data = general_memory_allocate(general, request_amount, BUBBLE_BUFFER);
        }
        void *old_data = buffer_edit_provide_memory(&file->state.buffer, new_data, request_amount);
        if (old_data) general_memory_free(general, old_data);
    }

    // NOTE(allen): meta data
    {
        Buffer_Measure_Starts state = {};
        Render_Font *font = get_font_info(models->font_set, file->state.font_id)->font;
        float *advance_data = 0;
        if (font) advance_data = font->advance_data;
        buffer_measure_starts_widths(&state, &file->state.buffer, advance_data);
    }

    // NOTE(allen): cursor fixing
    {
        Cursor_Fix_Descriptor desc = {};
        desc.is_batch = 1;
        desc.batch = batch;
        desc.batch_size = batch_size;

        file_edit_cursor_fix(system, part, general, file, layout, desc);
    }

    // NOTE(allen): token fixing
    if (file->state.tokens_complete){
        Cpp_Token_Stack tokens = file->state.token_stack;
        Cpp_Token *token = tokens.tokens;
        Cpp_Token *end_token = tokens.tokens + tokens.count;

        Buffer_Edit *edit = batch;
        Buffer_Edit *end_edit = batch + batch_size;

        i32 shift_amount = 0;
        i32 local_shift = 0;

        for (; token < end_token && edit < end_edit; ++edit){
            local_shift = (edit->len - (edit->end - edit->start));
            for (; token->start < edit->start && edit->start < token->start + token->size &&
                    token < end_token; ++token){
                token->size += local_shift;
            }
            for (; token->start < edit->start && token < end_token; ++token){
                token->start += shift_amount;
            }
            shift_amount += local_shift;
        }
        for (; token < end_token; ++token){
            token->start += shift_amount;
        }
    }
}

inline void
file_replace_range(System_Functions *system, Models *models, Editing_File *file,
    i32 start, i32 end, char *str, i32 len, i32 next_cursor, b32 use_high_permission = 0){
    Edit_Spec spec = {};
    spec.step.type = ED_NORMAL;
    spec.step.edit.start =  start;
    spec.step.edit.end = end;
    spec.step.edit.len = len;
    spec.step.pre_pos = file->state.cursor_pos;
    spec.step.post_pos = next_cursor;
    spec.str = (u8*)str;
    file_do_single_edit(system, models, file, spec, hist_normal, use_high_permission);
}

inline void
file_clear(System_Functions *system, Models *models, Editing_File *file, b32 use_high_permission = 0){
    file_replace_range(system, models, file, 0, buffer_size(&file->state.buffer), 0, 0, 0, use_high_permission);
}

inline void
view_replace_range(System_Functions *system, Models *models, View *view,
    i32 start, i32 end, char *str, i32 len, i32 next_cursor){
    file_replace_range(system, models, view->file, start, end, str, len, next_cursor);
}

inline void
view_post_paste_effect(View *view, i32 ticks, i32 start, i32 size, u32 color){
    Editing_File *file = view->file;

    file->state.paste_effect.start = start;
    file->state.paste_effect.end = start + size;
    file->state.paste_effect.color = color;
    file->state.paste_effect.tick_down = ticks;
    file->state.paste_effect.tick_max = ticks;
}

internal void
view_undo_redo(System_Functions *system,
    Models *models, View *view,
    Edit_Stack *stack, Edit_Type expected_type){
    Editing_File *file = view->file;

    if (stack->edit_count > 0){
        Edit_Step step = stack->edits[stack->edit_count-1];

        Assert(step.type == expected_type);

        Edit_Spec spec = {};
        spec.step = step;

        if (step.child_count == 0){
            spec.step.edit.str_start = 0;
            spec.str = stack->strings + step.edit.str_start;

            file_do_single_edit(system, models, file, spec, hist_normal);

            if (expected_type == ED_UNDO) view_cursor_move(view, step.pre_pos);
            else view_cursor_move(view, step.post_pos);
            view->mark = view->cursor.pos;

            view_post_paste_effect(view, 10, step.edit.start, step.edit.len,
                models->style.main.undo_color);
        }
        else{
            TentativeAssert(spec.step.special_type == 1);
            file_do_white_batch_edit(system, models, view->file, spec, hist_normal);
        }
    }
}

inline void
view_undo(System_Functions *system, Models *models, View *view){
    view_undo_redo(system, models, view, &view->file->state.undo.undo, ED_UNDO);
}

inline void
view_redo(System_Functions *system, Models *models, View *view){
    view_undo_redo(system, models, view, &view->file->state.undo.redo, ED_REDO);
}

inline u8*
write_data(u8 *ptr, void *x, i32 size){
    memcpy(ptr, x, size);
    return (ptr + size);
}

#define UseFileHistoryDump 0

#if UseFileHistoryDump
internal void
file_dump_history(System_Functions *system, Mem_Options *mem, Editing_File *file, char *filename){
    if (!file->state.undo.undo.edits) return;

    i32 size = 0;

    size += sizeof(i32);
    size += file->state.undo.undo.edit_count*sizeof(Edit_Step);
    size += sizeof(i32);
    size += file->state.undo.redo.edit_count*sizeof(Edit_Step);
    size += sizeof(i32);
    size += file->state.undo.history.edit_count*sizeof(Edit_Step);
    size += sizeof(i32);
    size += file->state.undo.children.edit_count*sizeof(Buffer_Edit);

    size += sizeof(i32);
    size += file->state.undo.undo.size;
    size += sizeof(i32);
    size += file->state.undo.redo.size;
    size += sizeof(i32);
    size += file->state.undo.history.size;
    size += sizeof(i32);
    size += file->state.undo.children.size;

    Partition *part = &mem->part;
    i32 remaining = partition_remaining(part);
    if (size < remaining){
        u8 *data, *curs;
        data = (u8*)part->base + part->pos;
        curs = data;
        curs = write_data(curs, &file->state.undo.undo.edit_count, 4);
        curs = write_data(curs, &file->state.undo.redo.edit_count, 4);
        curs = write_data(curs, &file->state.undo.history.edit_count, 4);
        curs = write_data(curs, &file->state.undo.children.edit_count, 4);
        curs = write_data(curs, &file->state.undo.undo.size, 4);
        curs = write_data(curs, &file->state.undo.redo.size, 4);
        curs = write_data(curs, &file->state.undo.history.size, 4);
        curs = write_data(curs, &file->state.undo.children.size, 4);

        curs = write_data(curs, file->state.undo.undo.edits, sizeof(Edit_Step)*file->state.undo.undo.edit_count);
        curs = write_data(curs, file->state.undo.redo.edits, sizeof(Edit_Step)*file->state.undo.redo.edit_count);
        curs = write_data(curs, file->state.undo.history.edits, sizeof(Edit_Step)*file->state.undo.history.edit_count);
        curs = write_data(curs, file->state.undo.children.edits, sizeof(Buffer_Edit)*file->state.undo.children.edit_count);

        curs = write_data(curs, file->state.undo.undo.strings, file->state.undo.undo.size);
        curs = write_data(curs, file->state.undo.redo.strings, file->state.undo.redo.size);
        curs = write_data(curs, file->state.undo.history.strings, file->state.undo.history.size);
        curs = write_data(curs, file->state.undo.children.strings, file->state.undo.children.size);

        Assert((i32)(curs - data) == size);
        system->save_file(filename, data, size);
    }
}
#endif

internal void
view_history_step(System_Functions *system, Models *models, View *view, History_Mode history_mode){
    Assert(history_mode != hist_normal);

    Editing_File *file = view->file;

    b32 do_history_step = 0;
    Edit_Step step = {};
    if (history_mode == hist_backward){
        if (file->state.undo.edit_history_cursor > 0){
            do_history_step = 1;
            step = file->state.undo.history.edits[--file->state.undo.edit_history_cursor];
        }
    }
    else{
        if (file->state.undo.edit_history_cursor < file->state.undo.history.edit_count){
            Assert(((file->state.undo.history.edit_count - file->state.undo.edit_history_cursor) & 1) == 0);
            step = file->state.undo.history.edits[--file->state.undo.history.edit_count];
            file->state.undo.history.size -= step.edit.len;
            ++file->state.undo.edit_history_cursor;
            do_history_step = 1;
        }
    }

    if (do_history_step){
        Edit_Spec spec;
        spec.step = step;

        if (spec.step.child_count == 0){
            spec.step.edit.str_start = 0;
            spec.str = file->state.undo.history.strings + step.edit.str_start;

            file_do_single_edit(system, models, file, spec, history_mode);

            switch (spec.step.type){
                case ED_NORMAL:
                case ED_REDO:
                view_cursor_move(view, step.post_pos);
                break;

                case ED_REVERSE_NORMAL:
                case ED_UNDO:
                view_cursor_move(view, step.pre_pos);
                break;
            }
            view->mark = view->cursor.pos;
        }
        else{
            TentativeAssert(spec.step.special_type == 1);
            file_do_white_batch_edit(system, models, view->file, spec, history_mode);
        }
    }
}

// TODO(allen): write these as streamed operations
internal i32
view_find_end_of_line(View *view, i32 pos){
#if BUFFER_EXPERIMENT_SCALPEL <= 0
    Editing_File *file = view->file;
    char *data = file->state.buffer.data;
    while (pos < file->state.buffer.size && data[pos] != '\n') ++pos;
    if (pos > file->state.buffer.size) pos = file->state.buffer.size;
#endif
    return pos;
}

internal i32
view_find_beginning_of_line(View *view, i32 pos){
#if BUFFER_EXPERIMENT_SCALPEL <= 0
    Editing_File *file = view->file;
    char *data = file->state.buffer.data;
    if (pos > 0){
        --pos;
        while (pos > 0 && data[pos] != '\n') --pos;
        if (pos != 0) ++pos;
    }
#endif
    return pos;
}

internal i32
view_find_beginning_of_next_line(View *view, i32 pos){
#if BUFFER_EXPERIMENT_SCALPEL <= 0
    Editing_File *file = view->file;
    char *data = file->state.buffer.data;
    while (pos < file->state.buffer.size &&
            !starts_new_line(data[pos])){
        ++pos;
    }
    if (pos < file->state.buffer.size){
        ++pos;
    }
#endif
    return pos;
}

internal String*
working_set_next_clipboard_string(General_Memory *general, Working_Set *working, i32 str_size){
    String *result = 0;
    i32 clipboard_current = working->clipboard_current;
    if (working->clipboard_size == 0){
        clipboard_current = 0;
        working->clipboard_size = 1;
    }
    else{
        ++clipboard_current;
        if (clipboard_current >= working->clipboard_max_size){
            clipboard_current = 0;
        }
        else if (working->clipboard_size <= clipboard_current){
            working->clipboard_size = clipboard_current+1;
        }
    }
    result = &working->clipboards[clipboard_current];
    working->clipboard_current = clipboard_current;
    working->clipboard_rolling = clipboard_current;
    char *new_str;
    if (result->str){
        new_str = (char*)general_memory_reallocate(general, result->str, result->size, str_size);
    }
    else{
        new_str = (char*)general_memory_allocate(general, str_size+1);
    }
    // TODO(allen): What if new_str == 0?
    *result = make_string(new_str, 0, str_size);
    return result;
}

internal String*
working_set_clipboard_head(Working_Set *working){
    String *result = 0;
    if (working->clipboard_size > 0){
        i32 clipboard_index = working->clipboard_current;
        working->clipboard_rolling = clipboard_index;
        result = &working->clipboards[clipboard_index];
    }
    return result;
}

internal String*
working_set_clipboard_roll_down(Working_Set *working){
    String *result = 0;
    if (working->clipboard_size > 0){
        i32 clipboard_index = working->clipboard_rolling;
        --clipboard_index;
        if (clipboard_index < 0){
            clipboard_index = working->clipboard_size-1;
        }
        working->clipboard_rolling = clipboard_index;
        result = &working->clipboards[clipboard_index];
    }
    return result;
}

internal void
clipboard_copy(System_Functions *system, General_Memory *general, Working_Set *working, Range range, Editing_File *file){
    i32 size = range.end - range.start;
    String *dest = working_set_next_clipboard_string(general, working, size);
    buffer_stringify(&file->state.buffer, range.start, range.end, dest->str);
    dest->size = size;
    system->post_clipboard(*dest);
}

internal Edit_Spec
file_compute_whitespace_edit(Mem_Options *mem, Editing_File *file, i32 cursor_pos,
    Buffer_Edit *edits, char *str_base, i32 str_size,
    Buffer_Edit *inverse_array, char *inv_str, i32 inv_max,
    i32 edit_count){
    General_Memory *general = &mem->general;

    i32 inv_str_pos = 0;
    Buffer_Invert_Batch state = {};
    if (buffer_invert_batch(&state, &file->state.buffer, edits, edit_count,
            inverse_array, inv_str, &inv_str_pos, inv_max))
        Assert(0);

    i32 first_child =
        undo_children_push(general, &file->state.undo.children,
        edits, edit_count, (u8*)(str_base), str_size);
    i32 inverse_first_child =
        undo_children_push(general, &file->state.undo.children,
        inverse_array, edit_count, (u8*)(inv_str), inv_str_pos);

    Edit_Spec spec = {};
    spec.step.type = ED_NORMAL;
    spec.step.first_child = first_child;
    spec.step.inverse_first_child = inverse_first_child;
    spec.step.special_type = 1;
    spec.step.child_count = edit_count;
    spec.step.inverse_child_count = edit_count;
    spec.step.pre_pos = cursor_pos;
    spec.step.post_pos = cursor_pos;

    return spec;
}

internal void
view_clean_whitespace(System_Functions *system, Models *models, View *view){
    Mem_Options *mem = &models->mem;
    Editing_File *file = view->file;

    Partition *part = &mem->part;
    i32 line_count = file->state.buffer.line_count;
    i32 edit_max = line_count * 2;
    i32 edit_count = 0;

    Assert(file && !file->state.is_dummy);

    Temp_Memory temp = begin_temp_memory(part);
    Buffer_Edit *edits = push_array(part, Buffer_Edit, edit_max);

    char *str_base = (char*)part->base + part->pos;
    i32 str_size = 0;
    for (i32 line_i = 0; line_i < line_count; ++line_i){
        i32 start = file->state.buffer.line_starts[line_i];
        i32 preferred_indentation;
        b32 all_whitespace = 0;
        b32 all_space = 0;
        i32 hard_start =
            buffer_find_hard_start(&file->state.buffer, start, &all_whitespace, &all_space,
            &preferred_indentation, 4);

        if (all_whitespace) preferred_indentation = 0;

        if ((all_whitespace && hard_start > start) || !all_space){
            Buffer_Edit new_edit;
            new_edit.str_start = str_size;
            str_size += preferred_indentation;
            char *str = push_array(part, char, preferred_indentation);
            for (i32 j = 0; j < preferred_indentation; ++j) str[j] = ' ';
            new_edit.len = preferred_indentation;
            new_edit.start = start;
            new_edit.end = hard_start;
            edits[edit_count++] = new_edit;
        }
        Assert(edit_count <= edit_max);
    }

    if (edit_count > 0){
        Assert(buffer_batch_debug_sort_check(edits, edit_count));

        // NOTE(allen): computing edit spec, doing batch edit
        Buffer_Edit *inverse_array = push_array(part, Buffer_Edit, edit_count);
        Assert(inverse_array);

        char *inv_str = (char*)part->base + part->pos;
        Edit_Spec spec =
            file_compute_whitespace_edit(mem, file, view->cursor.pos, edits, str_base, str_size,
            inverse_array, inv_str, part->max - part->pos, edit_count);

        file_do_white_batch_edit(system, models, view->file, spec, hist_normal);
    }

    end_temp_memory(temp);
}

internal void
view_auto_tab_tokens(System_Functions *system,
    Models *models, View *view,
    i32 start, i32 end, b32 empty_blank_lines, b32 use_tabs){
#if BUFFER_EXPERIMENT_SCALPEL <= 0
    Editing_File *file = view->file;
    Mem_Options *mem = &models->mem;
    Partition *part = &mem->part;
    Buffer *buffer = &file->state.buffer;

    Assert(file && !file->state.is_dummy);
    Cpp_Token_Stack tokens = file->state.token_stack;
    Assert(tokens.tokens);

    i32 line_start = buffer_get_line_index(buffer, start);
    i32 line_end = buffer_get_line_index(buffer, end) + 1;

    i32 edit_max = (line_end - line_start) * 2;
    i32 edit_count = 0;

    i32 indent_mark_count = line_end - line_start;

    Temp_Memory temp = begin_temp_memory(part);
    i32 *indent_marks = push_array(part, i32, indent_mark_count);
    {
        i32 current_indent = 0;
        i32 token_i;
        Cpp_Token *token, *self_token;

        {
            i32 start_pos = file->state.buffer.line_starts[line_start];
            Cpp_Get_Token_Result result = cpp_get_token(&tokens, start_pos);
            token_i = result.token_index;
            if (result.in_whitespace) token_i += 1;
            self_token = tokens.tokens + token_i;
        }

        i32 line = line_start - 1;
        for (; line >= 0; --line){
            i32 start = file->state.buffer.line_starts[line];
            b32 all_whitespace = 0;
            b32 all_space = 0;
            buffer_find_hard_start(&file->state.buffer, start,
                &all_whitespace, &all_space, &current_indent, 4);
            if (!all_whitespace) break;
        }

        if (line < 0){
            token_i = 0;
            token = tokens.tokens + token_i;
        }
        else{
            i32 start_pos = file->state.buffer.line_starts[line];
            Cpp_Get_Token_Result result = cpp_get_token(&tokens, start_pos);
            token_i = result.token_index;
            if (result.in_whitespace) token_i += 1;
            token = tokens.tokens + token_i;

            while (token >= tokens.tokens &&
                    token->flags & CPP_TFLAG_PP_DIRECTIVE ||
                    token->flags & CPP_TFLAG_PP_BODY){
                --token;
            }

            if (token < tokens.tokens){
                ++token;
                current_indent = 0;
            }
            else if (token->start < start_pos){
                line = buffer_get_line_index(&file->state.buffer, token->start);
                i32 start = file->state.buffer.line_starts[line];
                b32 all_whitespace = 0;
                b32 all_space = 0;
                buffer_find_hard_start(&file->state.buffer, start,
                    &all_whitespace, &all_space, &current_indent, 4);
                Assert(!all_whitespace);
            }
        }

        indent_marks -= line_start;
        i32 line_i = line_start;
        i32 next_line_start = file->state.buffer.line_starts[line_i];
        switch (token->type){
            case CPP_TOKEN_BRACKET_OPEN: current_indent += 4; break;
            case CPP_TOKEN_PARENTHESE_OPEN: current_indent += 4; break;
            case CPP_TOKEN_BRACE_OPEN: current_indent += 4; break;
        }

        Cpp_Token *prev_token = token;
        ++token;
        for (; line_i < line_end; ++token_i, ++token){
            for (; token->start >= next_line_start && line_i < line_end;){
                i32 this_line_start = next_line_start;
                next_line_start = file->state.buffer.line_starts[line_i+1];
                i32 this_indent;
                if (prev_token && prev_token->type == CPP_TOKEN_COMMENT &&
                        prev_token->start <= this_line_start && prev_token->start + prev_token->size > this_line_start){
                    this_indent = -1;
                }
                else{
                    this_indent = current_indent;
                    if (token->start < next_line_start){
                        if (token->flags & CPP_TFLAG_PP_DIRECTIVE) this_indent = 0;
                        else{
                            switch (token->type){
                                case CPP_TOKEN_BRACKET_CLOSE: this_indent -= 4; break;
                                case CPP_TOKEN_PARENTHESE_CLOSE: this_indent -= 4; break;
                                case CPP_TOKEN_BRACE_CLOSE: this_indent -= 4; break;
                                case CPP_TOKEN_BRACE_OPEN: break;
                                default:
                                if (current_indent > 0 && prev_token){
                                    if (!(prev_token->flags & CPP_TFLAG_PP_BODY ||
                                                prev_token->flags & CPP_TFLAG_PP_DIRECTIVE)){
                                        switch (prev_token->type){
                                            case CPP_TOKEN_BRACKET_OPEN: case CPP_TOKEN_PARENTHESE_OPEN:
                                            case CPP_TOKEN_BRACE_OPEN: case CPP_TOKEN_BRACE_CLOSE:
                                            case CPP_TOKEN_SEMICOLON: case CPP_TOKEN_COLON: break;
                                            case CPP_TOKEN_COMMA: case CPP_TOKEN_COMMENT: break;
                                            default: this_indent += 4;
                                        }
                                    }
                                }
                            }
                        }
                    }
                    if (this_indent < 0) this_indent = 0;
                }
                indent_marks[line_i] = this_indent;
                ++line_i;
            }

            switch (token->type){
                case CPP_TOKEN_BRACKET_OPEN: current_indent += 4; break;
                case CPP_TOKEN_BRACKET_CLOSE: current_indent -= 4; break;
                case CPP_TOKEN_PARENTHESE_OPEN: current_indent += 4; break;
                case CPP_TOKEN_PARENTHESE_CLOSE: current_indent -= 4; break;
                case CPP_TOKEN_BRACE_OPEN: current_indent += 4; break;
                case CPP_TOKEN_BRACE_CLOSE: current_indent -= 4; break;
            }
            prev_token = token;
        }
    }

    Buffer_Edit *edits = push_array(part, Buffer_Edit, edit_max);

    char *str_base = (char*)part->base + part->pos;
    i32 str_size = 0;
    for (i32 line_i = line_start; line_i < line_end; ++line_i){
        i32 start = file->state.buffer.line_starts[line_i];
        i32 preferred_indentation;
        i32 correct_indentation;
        b32 all_whitespace = 0;
        b32 all_space = 0;
        i32 tab_width = 4;
        i32 hard_start =
            buffer_find_hard_start(&file->state.buffer, start, &all_whitespace, &all_space,
                &preferred_indentation, tab_width);

        correct_indentation = indent_marks[line_i];
        if (all_whitespace && empty_blank_lines) correct_indentation = 0;
        if (correct_indentation == -1) correct_indentation = preferred_indentation;

        if ((all_whitespace && hard_start > start) || !all_space || correct_indentation != preferred_indentation){
            Buffer_Edit new_edit;
            new_edit.str_start = str_size;
            str_size += correct_indentation;
            char *str = push_array(part, char, correct_indentation);
            i32 j = 0;
            if (use_tabs){
                i32 i = 0;
                for (; i + tab_width <= correct_indentation; i += tab_width) str[j++] = '\t';
                for (; i < correct_indentation; ++i) str[j++] = ' ';
            }
            else{
                for (; j < correct_indentation; ++j) str[j] = ' ';
            }
            new_edit.len = j;
            new_edit.start = start;
            new_edit.end = hard_start;
            edits[edit_count++] = new_edit;
        }

        Assert(edit_count <= edit_max);
    }

    if (edit_count > 0){
        Assert(buffer_batch_debug_sort_check(edits, edit_count));

        // NOTE(allen): computing edit spec, doing batch edit
        Buffer_Edit *inverse_array = push_array(part, Buffer_Edit, edit_count);
        Assert(inverse_array);

        char *inv_str = (char*)part->base + part->pos;
        Edit_Spec spec =
            file_compute_whitespace_edit(mem, file, view->cursor.pos, edits, str_base, str_size,
            inverse_array, inv_str, part->max - part->pos, edit_count);

        file_do_white_batch_edit(system, models, view->file, spec, hist_normal);
    }

    {
        b32 all_whitespace = 0;
        b32 all_space = 0;
        i32 preferred_indentation;
        i32 start = view->cursor.pos;
        i32 hard_start = buffer_find_hard_start(
            &file->state.buffer, start, &all_whitespace, &all_space,
            &preferred_indentation, 4);

        view_cursor_move(view, hard_start);
    }

    end_temp_memory(temp);
#endif
}

struct Get_Link_Result{
    b32 in_link;
    i32 index;
};

internal u32*
style_get_color(Style *style, Cpp_Token token){
    u32 *result;
    if (token.flags & CPP_TFLAG_IS_KEYWORD){
        if (token.type == CPP_TOKEN_BOOLEAN_CONSTANT){
            result = &style->main.bool_constant_color;
        }
        else{
            result = &style->main.keyword_color;
        }
    }
    else if(token.flags & CPP_TFLAG_PP_DIRECTIVE){
        result = &style->main.preproc_color;
    }
    else{
        switch (token.type){
            case CPP_TOKEN_COMMENT:
            result = &style->main.comment_color;
            break;

            case CPP_TOKEN_STRING_CONSTANT:
            result = &style->main.str_constant_color;
            break;

            case CPP_TOKEN_CHARACTER_CONSTANT:
            result = &style->main.char_constant_color;
            break;

            case CPP_TOKEN_INTEGER_CONSTANT:
            result = &style->main.int_constant_color;
            break;

            case CPP_TOKEN_FLOATING_CONSTANT:
            result = &style->main.float_constant_color;
            break;

            case CPP_TOKEN_INCLUDE_FILE:
            result = &style->main.include_color;
            break;

            default:
            result = &style->main.default_color;
        }
    }
    return result;
}

inline f32
view_compute_max_target_y(i32 lowest_line, i32 line_height, f32 view_height){
    real32 max_target_y = ((lowest_line+.5f)*line_height) - view_height*.5f;
    return max_target_y;
}

internal f32
view_compute_max_target_y(View *view){
    i32 lowest_line = view_compute_lowest_line(view);
    i32 line_height = view->font_height;
    f32 view_height = view_compute_height(view);
    f32 max_target_y = view_compute_max_target_y(
        lowest_line, line_height, view_height);
    return max_target_y;
}

internal void
remeasure_file_view(System_Functions *system, View *view, i32_Rect rect){
    if (file_is_ready(view->file)){
        Relative_Scrolling relative = view_get_relative_scrolling(view);
        view_measure_wraps(system, &view->models->mem.general, view);
        view_cursor_move(view, view->cursor.pos);
        view->preferred_x = view_get_cursor_x(view);
        view_set_relative_scrolling(view, relative);
    }
}

internal void
undo_shit(System_Functions *system, View *view, UI_State *state, UI_Layout *layout,
    i32 total_count, i32 undo_count, i32 scrub_max){

    Editing_File *file = view->file;

    if (view->widget.timeline.undo_line){
        if (do_button(1, state, layout, "- Undo", 1)){
            view->widget.timeline.undo_line = 0;
        }

        if (view->widget.timeline.undo_line){
            Widget_ID wid = make_id(state, 2);
            i32 new_count;
            if (do_undo_slider(wid, state, layout, total_count, undo_count, 0, &new_count)){
                for (i32 i = 0; i < scrub_max && new_count < undo_count; ++i){
                    view_undo(system, view->models, view);
                    --undo_count;
                }
                for (i32 i = 0; i < scrub_max && new_count > undo_count; ++i){
                    view_redo(system, view->models, view);
                    ++undo_count;
                }
            }
        }
    }
    else{
        if (do_button(1, state, layout, "+ Undo", 1)){
            view->widget.timeline.undo_line = 1;
        }
    }

    if (view->widget.timeline.history_line){
        if (do_button(3, state, layout, "- History", 1)){
            view->widget.timeline.history_line = 0;
        }

        Widget_ID wid = make_id(state, 4);
        if (view->widget.timeline.history_line){
            i32 new_count;
            i32 mid = ((file->state.undo.history.edit_count + file->state.undo.edit_history_cursor) >> 1);
            i32 count = file->state.undo.edit_history_cursor;
            if (do_undo_slider(wid, state, layout, mid, count, &file->state.undo, &new_count)){
                for (i32 i = 0; i < scrub_max && new_count < count; ++i){
                    view_history_step(system, view->models, view, hist_backward);
                }
                for (i32 i = 0; i < scrub_max && new_count > count; ++i){
                    view_history_step(system, view->models, view, hist_forward);
                }
            }
        }
    }
    else{
        if (do_button(3, state, layout, "+ History", 1)){
            view->widget.timeline.history_line = 1;
        }
    }
}

internal void
draw_file_view_queries(View *view, UI_State *state, UI_Layout *layout){
    Widget_ID wid;
    Query_Slot *slot;
    Query_Bar *bar;
    i32 i = 1;

    for (slot = view->query_set.used_slot; slot != 0; slot = slot->next){
        wid = make_id(state, i++);
        bar = slot->query_bar;
        do_text_field(wid, state, layout, bar->prompt, bar->string);
    }
}

inline void
view_show_menu(View *fview, Command_Map *gui_map){
    fview->ui_state = {};
    fview->map_for_file = fview->map;
    fview->map = gui_map;
    fview->showing_ui = VUI_Menu;
}

inline void
view_show_config(View *fview, Command_Map *gui_map){
    fview->ui_state = {};
    fview->map_for_file = fview->map;
    fview->map = gui_map;
    fview->showing_ui = VUI_Config;
}

inline void
view_show_interactive(System_Functions *system, View *view, Command_Map *gui_map,
    Interactive_Action action, Interactive_Interaction interaction, String query){

    Models *models = view->models;

    view->ui_state = {};
    view->map_for_file = view->map;
    view->map = gui_map;
    view->showing_ui = VUI_Interactive;
    view->action = action;
    view->interaction = interaction;
    view->finished = 0;

    copy(&view->query, query);
    view->dest.str[0] = 0;
    view->dest.size = 0;

    hot_directory_clean_end(&models->hot_directory);
    hot_directory_reload(system, &models->hot_directory, &models->working_set);
}

inline void
view_show_theme(View *view, Command_Map *gui_map){
    view->ui_state = {};
    view->map_for_file = view->map;
    view->map = gui_map;
    view->showing_ui = VUI_Theme;
    view->color_mode = CV_Mode_Library;
    view->color = super_color_create(0xFF000000);
}

inline void
view_show_file(View *view, Command_Map *file_map){
    view->ui_state = {};
    if (file_map){
        view->map = file_map;
    }
    else{
        view->map = view->map_for_file;
    }
    view->showing_ui = VUI_None;
}

internal void
interactive_view_complete(View *view){
    Models *models = view->models;
    Panel *panel = view->panel;
    Editing_File *old_file = view->file;

    switch (view->action){
        case IAct_Open:
        delayed_open(&models->delay1, models->hot_directory.string, panel);
        delayed_touch_file(&models->delay1, old_file);
        break;

        case IAct_Save_As:
        delayed_save_as(&models->delay1, models->hot_directory.string, panel);
        break;

        case IAct_New:
        if (models->hot_directory.string.size > 0 &&
                !char_is_slash(models->hot_directory.string.str[models->hot_directory.string.size-1])){
            delayed_new(&models->delay1, models->hot_directory.string, panel);
        }
        break;

        case IAct_Switch:
        delayed_switch(&models->delay1, view->dest, panel);
        delayed_touch_file(&models->delay1, old_file);
        break;

        case IAct_Kill:
        delayed_try_kill(&models->delay1, view->dest);
        break;

        case IAct_Sure_To_Close:
        switch (view->user_action){
            case 0:
            delayed_close(&models->delay1);
            break;

            case 1:
            break;

            case 2:
            // TODO(allen): Save all.
            break;
        }
        break;
        
        case IAct_Sure_To_Kill:
        switch (view->user_action){
            case 0:
            delayed_kill(&models->delay1, view->dest);
            break;

            case 1:
            break;

            case 2:
            // TODO(allen): This is fishy! What if the save doesn't happen this time around?
            // We need to ensure delayed acts happen in order I think.
            delayed_save(&models->delay1, view->dest);
            delayed_kill(&models->delay1, view->dest);
            break;
        }
        break;
    }
    view_show_file(view, 0);

    // TODO(allen): This is here to prevent the key press from being passed to the
    // underlying file which is a giant pain.
    view->file = 0;
}

internal void
update_highlighting(View *view){
    View *file_view = view->hot_file_view;
    if (!file_view){
        view->highlight = {};
        return;
    }

    Editing_File *file = file_view->file;
    if (!file || !file_is_ready(file)){
        view->highlight = {};
        return;
    }

    Models *models = view->models;

    Style *style = &models->style;
    i32 pos = view_get_cursor_pos(file_view);
    char c = buffer_get_char(&file->state.buffer, pos);

    if (c == '\r'){
        view->highlight.ids[0] =
            raw_ptr_dif(&style->main.special_character_color, style);
    }

    else if (file->state.tokens_complete){
        Cpp_Token_Stack *tokens = &file->state.token_stack;
        Cpp_Get_Token_Result result = cpp_get_token(tokens, pos);
        Cpp_Token token = tokens->tokens[result.token_index];
        if (!result.in_whitespace){
            u32 *color = style_get_color(style, token);
            view->highlight.ids[0] = raw_ptr_dif(color, style);
            if (token.type == CPP_TOKEN_JUNK){
                view->highlight.ids[1] =
                    raw_ptr_dif(&style->main.highlight_junk_color, style);
            }
            else if (char_is_whitespace(c)){
                view->highlight.ids[1] =
                    raw_ptr_dif(&style->main.highlight_white_color, style);
            }
            else{
                view->highlight.ids[1] = 0;
            }
        }
        else{
            view->highlight.ids[0] = 0;
            view->highlight.ids[1] =
                raw_ptr_dif(&style->main.highlight_white_color, style);
        }
    }

    else{
        if (char_is_whitespace(c)){
            view->highlight.ids[0] = 0;
            view->highlight.ids[1] =
                raw_ptr_dif(&style->main.highlight_white_color, style);
        }
        else{
            view->highlight.ids[0] =
                raw_ptr_dif(&style->main.default_color, style);
            view->highlight.ids[1] = 0;
        }
    }

    if (file_view->show_temp_highlight){
        view->highlight.ids[2] =
            raw_ptr_dif(&style->main.highlight_color, style);
        view->highlight.ids[3] =
            raw_ptr_dif(&style->main.at_highlight_color, style);
    }
    else if (file->state.paste_effect.tick_down > 0){
        view->highlight.ids[2] =
            raw_ptr_dif(&style->main.paste_color, style);
        view->highlight.ids[3] = 0;
    }
    else{
        view->highlight.ids[2] = 0;
        view->highlight.ids[3] = 0;
    }
}

internal b32
theme_library_shit(System_Functions *system, Exchange *exchange,
    View *view, UI_State *state, UI_Layout *layout){

    Models *models = view->models;
    Mem_Options *mem = &models->mem;

    i32 result = 0;

    Library_UI ui;
    ui.state = state;
    ui.layout = layout;

    ui.fonts = models->font_set;
    ui.hot_directory = &models->hot_directory;
    ui.styles = &models->styles;

    Color_View_Mode mode = view->color_mode;

    i32_Rect bar_rect = ui.layout->rect;
    bar_rect.x0 = bar_rect.x1 - 20;
    do_scroll_bar(ui.state, bar_rect);

    ui.layout->y -= FLOOR32(view->ui_state.view_y);
    ui.layout->rect.x1 -= 20;

    b32 case_sensitive = 0;

    switch (mode){
        case CV_Mode_Library:
        {
            do_label(ui.state, ui.layout, literal("Current Theme - Click to Edit"));
            if (do_style_preview(&ui, &models->style)){
                view->color_mode = CV_Mode_Adjusting;
                view->ui_state.selected = {};
                ui.state->view_y = 0;
                result = 1;
            }

            begin_row(ui.layout, 3);
            if (ui.state->style->name.size >= 1){
                if (do_button(-2, ui.state, ui.layout, "Save", 2)){
                    //style_library_add(ui.styles, ui.state->style);
                }
            }
            else{
                do_button(-2, ui.state, ui.layout, "~Need's Name~", 2);
            }
            if (do_button(-3, ui.state, ui.layout, "Import", 2)){
                view->color_mode = CV_Mode_Import_File;
                hot_directory_clean_end(&models->hot_directory);
                hot_directory_reload(system, &models->hot_directory, &models->working_set);
            }
            if (do_button(-4, ui.state, ui.layout, "Export", 2)){
                view->color_mode = CV_Mode_Export;
                hot_directory_clean_end(&models->hot_directory);
                hot_directory_reload(system, &models->hot_directory, &models->working_set);
                memset(view->import_export_check, 0, sizeof(view->import_export_check));
            }

            do_label(ui.state, ui.layout, literal("Theme Library - Click to Select"));

            i32 style_count = models->styles.count;
            Style *style = models->styles.styles;
            for (i32 i = 0; i < style_count; ++i, ++style){
                if (do_style_preview(&ui, style)){
                    style_copy(&models->style, style);
                    result = 1;
                }
            }
        }break;

        case CV_Mode_Import_File:
        {
            do_label(ui.state, ui.layout, literal("Current Theme"));
            do_style_preview(&ui, &models->style);

            b32 file_selected = 0;

            do_label(ui.state, ui.layout, literal("Import Which File?"));
            begin_row(ui.layout, 2);
            if (do_button(-2, ui.state, ui.layout, "*.p4c only", 2, 1, view->p4c_only)){
                view->p4c_only = !view->p4c_only;
            }
            if (do_button(-3, ui.state, ui.layout, "Cancel", 2)){
                view->color_mode = CV_Mode_Library;
            }

            b32 new_dir = 0;
            if (do_file_list_box(system, ui.state, ui.layout,
                    ui.hot_directory, view->p4c_only, 1, case_sensitive,
                    &new_dir, &file_selected, 0)){
                result = 1;
            }

            if (new_dir){
                hot_directory_reload(system, ui.hot_directory, ui.state->working_set);
            }
            if (file_selected){
                memset(&view->inspecting_styles, 0, sizeof(Style_Library));
                memset(view->import_export_check, 1,
                    sizeof(view->import_export_check));

                view->import_file_id = exchange_request_file(exchange,
                    models->hot_directory.string.str,
                    models->hot_directory.string.size);
                view->color_mode = CV_Mode_Import_Wait;

            }
        }break;

        case CV_Mode_Import_Wait:
        {
            Style *styles = view->inspecting_styles.styles;
            Data file = {};
            i32 file_max = 0;

            i32 count = 0;
            i32 max = ArrayCount(view->inspecting_styles.styles);

            AllowLocal(styles);
            AllowLocal(max);

            if (exchange_file_ready(exchange, view->import_file_id,
                    &file.data, &file.size, &file_max)){
                if (file.data){
                    if (0 /* && style_library_import(file, ui.fonts, styles, max, &count) */){
                        view->color_mode = CV_Mode_Import;
                    }
                    else{
                        view->color_mode = CV_Mode_Library;
                    }
                    view->inspecting_styles.count = count;
                }
                else{
                    Assert(!"this shouldn't happen!");
                }

                exchange_free_file(exchange, view->import_file_id);
            }
        }break;

        case CV_Mode_Export_File:
        {
            do_label(ui.state, ui.layout, literal("Current Theme"));
            do_style_preview(&ui, &models->style);

            b32 file_selected = 0;

            do_label(ui.state, ui.layout, literal("Export File Name?"));
            begin_row(ui.layout, 2);
            if (do_button(-2, ui.state, ui.layout, "Finish Export", 2)){
                file_selected = 1;
            }
            if (do_button(-3, ui.state, ui.layout, "Cancel", 2)){
                view->color_mode = CV_Mode_Library;
            }

            b32 new_dir = 0;
            if (do_file_list_box(system, ui.state, ui.layout,
                    ui.hot_directory, 1, 1, case_sensitive,
                    &new_dir, &file_selected, ".p4c")){
                result = 1;
            }

            if (new_dir){
                hot_directory_reload(system,
                    ui.hot_directory, ui.state->working_set);
            }
            if (file_selected){
                i32 count = ui.styles->count;
                Temp_Memory temp = begin_temp_memory(&mem->part);
                Style **styles = push_array(&mem->part, Style*, sizeof(Style*)*count);

                Style *style = ui.styles->styles;
                b8 *export_check = view->import_export_check;
                i32 export_count = 0;
                for (i32 i = 0; i < count; ++i, ++style){
                    if (export_check[i]){
                        styles[export_count++] = style;
                    }
                }
                char *data = push_array(&mem->part, char, ui.hot_directory->string.size + 5);
                String str = make_string(data, 0, ui.hot_directory->string.size + 5);
                copy(&str, ui.hot_directory->string);
                append(&str, make_lit_string(".p4c"));
                /*style_library_export(system, exchange, mem, &target->font_set, str.str, styles, export_count);*/

                end_temp_memory(temp);
                view->color_mode = CV_Mode_Library;
            }
        }break;

        case CV_Mode_Import:
        {
            do_label(ui.state, ui.layout, literal("Current Theme"));
            do_style_preview(&ui, &models->style);

            i32 style_count = view->inspecting_styles.count;
            Style *styles = view->inspecting_styles.styles;
            b8 *import_check = view->import_export_check;

            do_label(ui.state, ui.layout, literal("Pack"));
            begin_row(ui.layout, 2);
            if (do_button(-2, ui.state, ui.layout, "Finish Import", 2)){
                Style *style = styles;
                for (i32 i = 0; i < style_count; ++i, ++style){
                    //if (import_check[i]) style_library_add(ui.styles, style);
                }
                view->color_mode = CV_Mode_Library;
            }
            if (do_button(-3, ui.state, ui.layout, "Cancel", 2)){
                view->color_mode = CV_Mode_Library;
            }

            Style *style = styles;
            for (i32 i = 0; i < style_count; ++i, ++style){
                if (do_style_preview(&ui, style, import_check[i])){
                    import_check[i] = !import_check[i];
                    result = 1;
                }
            }
        }break;

        case CV_Mode_Export:
        {
            do_label(ui.state, ui.layout, literal("Current Theme"));
            do_style_preview(&ui, &models->style);

            do_label(ui.state, ui.layout, literal("Export Which Themes?"));
            begin_row(ui.layout, 2);
            if (do_button(-2, ui.state, ui.layout, "Export", 2)){
                view->color_mode = CV_Mode_Export_File;
            }
            if (do_button(-3, ui.state, ui.layout, "Cancel", 2)){
                view->color_mode = CV_Mode_Library;
            }

            i32 style_count = models->styles.count;
            Style *style = models->styles.styles;
            b8 *export_check = view->import_export_check;
            for (i32 i = 0; i < style_count; ++i, ++style){
                if (do_style_preview(&ui, style, export_check[i])){
                    export_check[i] = !export_check[i];
                    result = 1;
                }
            }
        }break;
    }

    return (result);
}

internal b32
theme_adjusting_shit(View *view, UI_State *state, UI_Layout *layout, Super_Color *color){
    update_highlighting(view);

    Models *models = view->models;

    Style *style = &models->style;
    i32 result = 0;

    Color_UI ui;
    ui.state = state;
    ui.layout = layout;

    ui.fonts = models->font_set;
    ui.global_font = &models->global_font;
    ui.highlight = view->highlight;
    ui.color = view->color;
    ui.has_hover_color = 0;
    ui.state->sub_id1_change = 0;
    ui.hex_advance = font_get_max_width(ui.fonts, ui.state->font_id, "0123456789abcdefx");
    ui.palette = models->palette;
    ui.palette_size = models->palette_size;

    i32_Rect bar_rect = ui.layout->rect;
    bar_rect.x0 = bar_rect.x1 - 20;
    do_scroll_bar(ui.state, bar_rect);

    ui.layout->y -= FLOOR32(view->ui_state.view_y);
    ui.layout->rect.x1 -= 20;

    if (do_button(-1, ui.state, ui.layout, "Back to Library", 2)){
        view->color_mode = CV_Mode_Library;
        ui.state->view_y = 0;
    }

    do_style_name(&ui);
    do_font_switch(&ui);

    do_color_adjuster(&ui, &style->main.back_color,
        style->main.default_color, style->main.back_color,
        "Background");
    do_color_adjuster(&ui, &style->main.margin_color,
        style->main.default_color, style->main.margin_color,
        "Margin");
    do_color_adjuster(&ui, &style->main.margin_hover_color,
        style->main.default_color, style->main.margin_hover_color,
        "Margin Hover");
    do_color_adjuster(&ui, &style->main.margin_active_color,
        style->main.default_color, style->main.margin_active_color,
        "Margin Active");

    do_color_adjuster(&ui, &style->main.cursor_color,
        style->main.at_cursor_color, style->main.cursor_color,
        "Cursor");
    do_color_adjuster(&ui, &style->main.at_cursor_color,
        style->main.at_cursor_color, style->main.cursor_color,
        "Text At Cursor");
    do_color_adjuster(&ui, &style->main.mark_color,
        style->main.mark_color, style->main.back_color,
        "Mark");

    do_color_adjuster(&ui, &style->main.highlight_color,
        style->main.at_highlight_color, style->main.highlight_color,
        "Highlight");
    do_color_adjuster(&ui, &style->main.at_highlight_color,
        style->main.at_highlight_color, style->main.highlight_color,
        "Text At Highlight");

    do_color_adjuster(&ui, &style->main.default_color,
        style->main.default_color, style->main.back_color,
        "Text Default");
    do_color_adjuster(&ui, &style->main.comment_color,
        style->main.comment_color, style->main.back_color,
        "Comment");
    do_color_adjuster(&ui, &style->main.keyword_color,
        style->main.keyword_color, style->main.back_color,
        "Keyword");
    do_color_adjuster(&ui, &style->main.str_constant_color,
        style->main.str_constant_color, style->main.back_color,
        "String Constant");
    do_color_adjuster(&ui, &style->main.char_constant_color,
        style->main.char_constant_color, style->main.back_color,
        "Character Constant");
    do_color_adjuster(&ui, &style->main.int_constant_color,
        style->main.int_constant_color, style->main.back_color,
        "Integer Constant");
    do_color_adjuster(&ui, &style->main.float_constant_color,
        style->main.float_constant_color, style->main.back_color,
        "Float Constant");
    do_color_adjuster(&ui, &style->main.bool_constant_color,
        style->main.bool_constant_color, style->main.back_color,
        "Boolean Constant");
    do_color_adjuster(&ui, &style->main.preproc_color,
        style->main.preproc_color, style->main.back_color,
        "Preprocessor");
    do_color_adjuster(&ui, &style->main.include_color,
        style->main.include_color, style->main.back_color,
        "Include Constant");
    do_color_adjuster(&ui, &style->main.special_character_color,
        style->main.special_character_color, style->main.back_color,
        "Special Character");

    do_color_adjuster(&ui, &style->main.highlight_junk_color,
        style->main.default_color, style->main.highlight_junk_color,
        "Junk Highlight");
    do_color_adjuster(&ui, &style->main.highlight_white_color,
        style->main.default_color, style->main.highlight_white_color,
        "Whitespace Highlight");

    do_color_adjuster(&ui, &style->main.paste_color,
        style->main.paste_color, style->main.back_color,
        "Paste Color");

    Interactive_Style *bar_style = &style->main.file_info_style;
    do_color_adjuster(&ui, &bar_style->bar_color,
        bar_style->base_color, bar_style->bar_color,
        "Bar");
    do_color_adjuster(&ui, &bar_style->base_color,
        bar_style->base_color, bar_style->bar_color,
        "Bar Text");
    do_color_adjuster(&ui, &bar_style->pop1_color,
        bar_style->pop1_color, bar_style->bar_color,
        "Bar Pop 1");
    do_color_adjuster(&ui, &bar_style->pop2_color,
        bar_style->pop2_color, bar_style->bar_color,
        "Bar Pop 2");

    *color = ui.hover_color;

    return (result);
}

internal b32
theme_shit(System_Functions *system, Exchange *exchange,
    View *view, View *active, UI_State *state, UI_Layout *layout, Super_Color *color){
    b32 result = 0;

    if (view != active){
        view->hot_file_view = active;
    }

    switch (view->color_mode){
        case CV_Mode_Library:
        case CV_Mode_Import_File:
        case CV_Mode_Export_File:
        case CV_Mode_Import:
        case CV_Mode_Export:
        case CV_Mode_Import_Wait:
        if (theme_library_shit(system, exchange, view, state, layout)){
            result = 1;
        }
        break;

        case CV_Mode_Adjusting:
        if (theme_adjusting_shit(view, state, layout, color)){
            result = 1;
        }
        break;
    }

    return(result);
}

internal b32
interactive_shit(System_Functions *system, View *view, UI_State *state, UI_Layout *layout){
    b32 result = 0;
    b32 new_dir = 0;
    b32 complete = 0;

    Models *models = view->models;

    do_label(state, layout, view->query, 1.f);

    b32 case_sensitive = 0;

    b32 input_stage = state->input_stage;
    Key_Summary *keys = state->keys;

    switch (view->interaction){
        case IInt_Sys_File_List:
        {
            b32 is_new = (view->action == IAct_New);

            if (do_file_list_box(system, state, layout,
                    &models->hot_directory, 0, !is_new, case_sensitive,
                    &new_dir, &complete, 0)){
                result = 1;
            }
            if (new_dir){
                hot_directory_reload(system, &models->hot_directory, &models->working_set);
            }
        }break;

        case IInt_Live_File_List:
        {
            if (do_live_file_list_box(system, state, layout, &models->working_set, &view->dest, &complete)){
                result = 1;
            }
        }break;

        case IInt_Sure_To_Close:
        {
            i32 action = -1;
            char s_[256];
            String s;
            s = make_fixed_width_string(s_);
            append(&s, "There are unsaved changes in, close anyway?");
            do_label(state, layout, s, 1.f);

            i32 id = 0;
            if (do_list_option(++id, state, layout, make_lit_string("(Y)es"))){
                action = 0;
            }

            if (do_list_option(++id, state, layout, make_lit_string("(N)o"))){
                action = 1;
            }

            if (action == -1 && input_stage){
                i32 key_count = keys->count;
                for (i32 i = 0; i < key_count; ++i){
                    Key_Event_Data key = keys->keys[i];
                    switch (key.character){
                        case 'y': case 'Y': action = 0; break;
                        case 'n': case 'N': action = 1; break;
                    }
                    if (action == -1 && key.keycode == key_esc) action = 1;
                    if (action != -1) break;
                }
            }

            if (action != -1){
                complete = 1;
                view->user_action = action;
            }
        }break;
        
        case IInt_Sure_To_Kill:
        {
            i32 action = -1;
            char s_[256];
            String s;
            s = make_fixed_width_string(s_);
            append(&s, view->dest);
            append(&s, " has unsaved changes, kill it?");
            do_label(state, layout, s, 1.f);

            i32 id = 0;
            if (do_list_option(++id, state, layout, make_lit_string("(Y)es"))){
                action = 0;
            }

            if (do_list_option(++id, state, layout, make_lit_string("(N)o"))){
                action = 1;
            }

            if (do_list_option(++id, state, layout, make_lit_string("(S)ave and kill"))){
                action = 2;
            }

            if (action == -1 && input_stage){
                i32 key_count = keys->count;
                for (i32 i = 0; i < key_count; ++i){
                    Key_Event_Data key = keys->keys[i];
                    switch (key.character){
                        case 'y': case 'Y': action = 0; break;
                        case 'n': case 'N': action = 1; break;
                        case 's': case 'S': action = 2; break;
                    }
                    if (action == -1 && key.keycode == key_esc) action = 1;
                    if (action != -1) break;
                }
            }

            if (action != -1){
                complete = 1;
                view->user_action = action;
            }
        }break;
    }

    if (complete){
        view->finished = 1;
        interactive_view_complete(view);
        result= 1;
    }

    return(result);
}

internal void
menu_shit(View *view, UI_State *state, UI_Layout *layout){
    i32 id = 0;

    do_label(state, layout, literal("Menu"), 2.f);

    if (do_list_option(++id, state, layout, make_lit_string("Theme Options"))){
        view_show_theme(view, view->map);
    }

    if (do_list_option(++id, state, layout, make_lit_string("Keyboard Layout Options"))){
        view_show_config(view, view->map);
    }
}

internal void
config_shit(View *view, UI_State *state, UI_Layout *layout){
    i32 id = 0;
    Models *models = view->models;

    do_label(state, layout, literal("Config"), 2.f);

    if (do_checkbox_list_option(++id, state, layout, make_lit_string("Left Ctrl + Left Alt = AltGr"),
            models->settings.lctrl_lalt_is_altgr)){
        models->settings.lctrl_lalt_is_altgr = !models->settings.lctrl_lalt_is_altgr;
    }
}

struct File_Bar{
    f32 pos_x, pos_y;
    f32 text_shift_x, text_shift_y;
    i32_Rect rect;
    i16 font_id;
};

internal void
intbar_draw_string(Render_Target *target, File_Bar *bar, String str, u32 char_color){
    i16 font_id = bar->font_id;

    draw_string(target, font_id, str,
        (i32)(bar->pos_x + bar->text_shift_x),
        (i32)(bar->pos_y + bar->text_shift_y),
        char_color);
    bar->pos_x += font_string_width(target, font_id, str);
}

internal void
do_file_bar(View *view, Editing_File *file, UI_Layout *layout, Render_Target *target){
    File_Bar bar;
    Models *models = view->models;
    Style_Font *font = &models->global_font;
    i32 line_height = view->font_height;
    Interactive_Style bar_style = models->style.main.file_info_style;

    u32 back_color = bar_style.bar_color;
    u32 base_color = bar_style.base_color;
    u32 pop1_color = bar_style.pop1_color;
    u32 pop2_color = bar_style.pop2_color;

    bar.rect = layout_rect(layout, line_height + 2);

    if (target){
        bar.font_id = font->font_id;
        bar.pos_x = (f32)bar.rect.x0;
        bar.pos_y = (f32)bar.rect.y0;
        bar.text_shift_y = 2;
        bar.text_shift_x = 0;

        draw_rectangle(target, bar.rect, back_color);    
        intbar_draw_string(target, &bar, file->name.live_name, base_color);
        intbar_draw_string(target, &bar, make_lit_string(" -"), base_color);

        if (file->state.is_loading){
            intbar_draw_string(target, &bar, make_lit_string(" loading"), base_color);
        }
        else{
            char line_number_space[30];
            String line_number = make_string(line_number_space, 0, 30);
            append(&line_number, " L#");
            append_int_to_str(view->cursor.line, &line_number);

            intbar_draw_string(target, &bar, line_number, base_color);

            intbar_draw_string(target, &bar, make_lit_string(" -"), base_color);

            if (file->settings.dos_write_mode){
                intbar_draw_string(target, &bar, make_lit_string(" dos"), base_color);
            }
            else{
                intbar_draw_string(target, &bar, make_lit_string(" nix"), base_color);
            }

            if (file->state.still_lexing){
                intbar_draw_string(target, &bar, make_lit_string(" parsing"), pop1_color);
            }

            if (!file->settings.unimportant){
                switch (buffer_get_sync(file)){
                    case SYNC_BEHIND_OS:
                    {
                        persist String out_of_sync = make_lit_string(" !");
                        intbar_draw_string(target, &bar, out_of_sync, pop2_color);
                    }break;

                    case SYNC_UNSAVED:
                    {
                        persist String out_of_sync = make_lit_string(" *");
                        intbar_draw_string(target, &bar, out_of_sync, pop2_color);
                    }break;
                }
            }
        }
    }
}

internal void
view_reinit_scrolling(View *view){
    Editing_File *file = view->file;
    f32 w, h;
    f32 cursor_x, cursor_y;
    f32 target_x, target_y;

    view->reinit_scrolling = 0;

    target_x = 0;
    target_y = 0;

    if (file && file_is_ready(file)){
        cursor_x = view_get_cursor_x(view);
        cursor_y = view_get_cursor_y(view);

        w = view_compute_width(view);
        h = view_compute_height(view);

        if (cursor_x >= target_x + w){
            target_x = (f32)(cursor_x - w*.5f);
        }

        target_y = (f32)FLOOR32(cursor_y - h*.5f);
        if (target_y < view->scroll_min_limit) target_y = view->scroll_min_limit;
    }

    view->target_x = target_x;
    view->target_y = target_y;
    view->scroll_x = target_x;
    view->scroll_y = target_y;
    view->prev_target_x = -1000.f;
    view->prev_target_y = -1000.f;
}

internal i32
step_file_view(System_Functions *system, Exchange *exchange, View *view, i32_Rect rect,
    b32 is_active, Input_Summary *user_input){

    Models *models = view->models;
    i32 result = 0;
    Editing_File *file = view->file;

    i32 widget_height = 0;
    {
        UI_State state = 
            ui_state_init(&view->widget.state, 0, user_input,
            &models->style, models->global_font.font_id, models->font_set, 0, 1);

        UI_Layout layout;
        begin_layout(&layout, rect);

        switch (view->widget.type){
            case FWIDG_NONE:
            {
                if (file && view->showing_ui == VUI_None){
                    do_file_bar(view, file, &layout, 0);
                }

                draw_file_view_queries(view, &state, &layout);
            }break;

            case FWIDG_TIMELINES:
            {
                i32 scrub_max = view->scrub_max;
                i32 undo_count = file->state.undo.undo.edit_count;
                i32 redo_count = file->state.undo.redo.edit_count;
                i32 total_count = undo_count + redo_count;

                undo_shit(system, view, &state, &layout, total_count, undo_count, scrub_max);
            }break;
        }

        widget_height = layout.y - rect.y0;
        if (ui_finish_frame(&view->widget.state, &state, &layout, rect, 0, 0)){
            result = 1;
        }
    }

    view->scroll_min_limit = (f32)-widget_height;
    if (view->reinit_scrolling){
        view_reinit_scrolling(view);
    }

    // TODO(allen): Split this into passive step and step that depends on input
    if (view->showing_ui == VUI_None && file && !file->state.is_loading){
        f32 line_height = (f32)view->font_height;
        f32 cursor_y = view_get_cursor_y(view);
        f32 target_y = view->target_y;
        f32 max_y = view_compute_height(view) - line_height*2;
        i32 lowest_line = view_compute_lowest_line(view);
        f32 max_target_y = view_compute_max_target_y(lowest_line, (i32)line_height, max_y);
        f32 delta_y = 3.f*line_height;
        f32 extra_top = (f32)widget_height;
        f32 taken_top_space = line_height + extra_top;

        if (user_input->mouse.wheel != 0){
            f32 wheel_multiplier = 3.f;
            f32 delta_target_y = delta_y*user_input->mouse.wheel*wheel_multiplier;
            target_y += delta_target_y;

            if (target_y < -taken_top_space) target_y = -taken_top_space;
            if (target_y > max_target_y) target_y = max_target_y;

            f32 old_cursor_y = cursor_y;
            if (cursor_y >= target_y + max_y) cursor_y = target_y + max_y;
            if (cursor_y < target_y + taken_top_space) cursor_y = target_y + taken_top_space;

            if (cursor_y != old_cursor_y){
                view->cursor =
                    view_compute_cursor_from_xy(view,
                    view->preferred_x,
                    cursor_y);
            }

            result = 1;
        }

        if (cursor_y > target_y + max_y){
            target_y = cursor_y - max_y + delta_y;
        }
        if (cursor_y < target_y + taken_top_space){
            target_y = cursor_y - delta_y - taken_top_space;
        }

        if (target_y > max_target_y) target_y = max_target_y;
        if (target_y < -extra_top) target_y = -extra_top;
        view->target_y = target_y;

        f32 cursor_x = view_get_cursor_x(view);
        f32 target_x = view->target_x;
        f32 max_x = view_compute_width(view);
        if (cursor_x < target_x){
            target_x = (f32)Max(0, cursor_x - max_x/2);
        }
        else if (cursor_x >= target_x + max_x){
            target_x = (f32)(cursor_x - max_x/2);
        }

        view->target_x = target_x;

        b32 is_new_target = 0;
        if (view->target_x != view->prev_target_x) is_new_target = 1;
        if (view->target_y != view->prev_target_y) is_new_target = 1;

        if (view->models->scroll_rule(
                view->target_x, view->target_y,
                &view->scroll_x, &view->scroll_y,
                (view->id) + 1, is_new_target)){
            result = 1;
        }

        view->prev_target_x = view->target_x;
        view->prev_target_y = view->target_y;

        if (file->state.paste_effect.tick_down > 0){
            --file->state.paste_effect.tick_down;
            result = 1;
        }

        if (user_input->mouse.press_l && is_active){
            f32 max_y = view_compute_height(view);
            f32 rx = (f32)(user_input->mouse.x - rect.x0);
            f32 ry = (f32)(user_input->mouse.y - rect.y0);

            if (ry >= extra_top){
                view_set_widget(view, FWIDG_NONE);
                if (rx >= 0 && rx < max_x && ry >= 0 && ry < max_y){
                    view_cursor_move(view, rx + view->scroll_x, ry + view->scroll_y, 1);
                    view->mode = {};
                }
            }
            result = 1;
        }

        if (!is_active) view_set_widget(view, FWIDG_NONE);
    }

    {
        UI_State state =
            ui_state_init(&view->ui_state, 0, user_input,
            &models->style, models->global_font.font_id, models->font_set, &models->working_set, 1);

        UI_Layout layout;
        begin_layout(&layout, rect);

        Super_Color color = {};

        switch (view->showing_ui){
            case VUI_None: break;
            case VUI_Theme:
            {
                theme_shit(system, exchange, view, 0, &state, &layout, &color);
            }break;
            case VUI_Interactive:
            {
                if (interactive_shit(system, view, &state, &layout)){
                    result = 1;
                }
            }break;
            case VUI_Menu:
            {
                menu_shit(view, &state, &layout);
            }break;
            case VUI_Config:
            {
                config_shit(view, &state, &layout);
            }break;
        }

        i32 did_activation = 0;
        if (ui_finish_frame(&view->ui_state, &state, &layout, rect, 0, &did_activation)){
            result = 1;
        }
        if (did_activation){
            if (view->showing_ui == VUI_Theme){
                view->color = color;
                result = 1;
            }
        }
    }

    return(result);
}

internal i32
draw_file_loaded(View *view, i32_Rect rect, b32 is_active, Render_Target *target){
    Models *models = view->models;
    Editing_File *file = view->file;
    Style *style = &models->style;
    i32 line_height = view->font_height;

    i32 max_x = rect.x1 - rect.x0;
    i32 max_y = rect.y1 - rect.y0 + line_height;

    Assert(file && !file->state.is_dummy && buffer_good(&file->state.buffer));

    b32 tokens_use = 0;
    Cpp_Token_Stack token_stack = {};
    if (file){
        tokens_use = file->state.tokens_complete && (file->state.token_stack.count > 0);
        token_stack = file->state.token_stack;
    }

    Partition *part = &models->mem.part;

    Temp_Memory temp = begin_temp_memory(part);

    partition_align(part, 4);
    i32 max = partition_remaining(part) / sizeof(Buffer_Render_Item);
    Buffer_Render_Item *items = push_array(part, Buffer_Render_Item, max);

    i16 font_id = models->global_font.font_id;
    Render_Font *font = get_font_info(models->font_set, font_id)->font;
    float *advance_data = 0;
    if (font) advance_data = font->advance_data;

    i32 count;
    Full_Cursor render_cursor;
    Buffer_Render_Options opts = {};

    f32 *wraps = view->line_wrap_y;
    f32 scroll_x = view->scroll_x;
    f32 scroll_y = view->scroll_y;

    {
        render_cursor = buffer_get_start_cursor(&file->state.buffer, wraps, scroll_y,
                                                !view->unwrapped_lines, (f32)max_x, advance_data, (f32)line_height);

        view->scroll_i = render_cursor.pos;

        buffer_get_render_data(&file->state.buffer, items, max, &count,
                               (f32)rect.x0, (f32)rect.y0,
                               scroll_x, scroll_y, render_cursor,
                               !view->unwrapped_lines,
                               (f32)max_x, (f32)max_y,
                               advance_data, (f32)line_height,
                               opts);
    }

    Assert(count > 0);

    i32 cursor_begin, cursor_end;
    u32 cursor_color, at_cursor_color;
    if (view->show_temp_highlight){
        cursor_begin = view->temp_highlight.pos;
        cursor_end = view->temp_highlight_end_pos;
        cursor_color = style->main.highlight_color;
        at_cursor_color = style->main.at_highlight_color;
    }
    else{
        cursor_begin = view->cursor.pos;
        cursor_end = cursor_begin + 1;
        cursor_color = style->main.cursor_color;
        at_cursor_color = style->main.at_cursor_color;
    }

    i32 token_i = 0;
    u32 main_color = style->main.default_color;
    u32 special_color = style->main.special_character_color;
    if (tokens_use){
        Cpp_Get_Token_Result result = cpp_get_token(&token_stack, items->index);
        main_color = *style_get_color(style, token_stack.tokens[result.token_index]);
        token_i = result.token_index + 1;
    }

    u32 mark_color = style->main.mark_color;
    Buffer_Render_Item *item = items;
    i32 prev_ind = -1;
    u32 highlight_color = 0;
    u32 highlight_this_color = 0;

    for (i32 i = 0; i < count; ++i, ++item){
        i32 ind = item->index;
        highlight_this_color = 0;
        if (tokens_use && ind != prev_ind){
            Cpp_Token current_token = token_stack.tokens[token_i-1];

            if (token_i < token_stack.count){
                if (ind >= token_stack.tokens[token_i].start){
                    main_color =
                        *style_get_color(style, token_stack.tokens[token_i]);
                    current_token = token_stack.tokens[token_i];
                    ++token_i;
                }
                else if (ind >= current_token.start + current_token.size){
                    main_color = 0xFFFFFFFF;
                }
            }

            if (current_token.type == CPP_TOKEN_JUNK &&
                i >= current_token.start && i < current_token.start + current_token.size){
                highlight_color = style->main.highlight_junk_color;
            }
            else{
                highlight_color = 0;
            }
        }

        u32 char_color = main_color;
        if (item->flags & BRFlag_Special_Character) char_color = special_color;

        f32_Rect char_rect = f32R(item->x0, item->y0, item->x1, item->y1);
        if (view->show_whitespace && highlight_color == 0 &&
            char_is_whitespace((char)item->glyphid)){
            highlight_this_color = style->main.highlight_white_color;
        }
        else{
            highlight_this_color = highlight_color;
        }

        if (cursor_begin <= ind && ind < cursor_end && (ind != prev_ind || cursor_begin < ind)){
            if (is_active){
                draw_rectangle(target, char_rect, cursor_color);
                char_color = at_cursor_color;
            }
            else{
                if (!view->show_temp_highlight){
                    draw_rectangle_outline(target, char_rect, cursor_color);
                }
            }
        }
        else if (highlight_this_color){
            draw_rectangle(target, char_rect, highlight_this_color);
        }

        u32 fade_color = 0xFFFF00FF;
        f32 fade_amount = 0.f;

        if (file->state.paste_effect.tick_down > 0 &&
            file->state.paste_effect.start <= ind &&
            ind < file->state.paste_effect.end){
            fade_color = file->state.paste_effect.color;
            fade_amount = (f32)(file->state.paste_effect.tick_down) / file->state.paste_effect.tick_max;
        }

        char_color = color_blend(char_color, fade_amount, fade_color);

        if (ind == view->mark && prev_ind != ind){
            draw_rectangle_outline(target, char_rect, mark_color);
        }
        if (item->glyphid != 0){
            font_draw_glyph(target, font_id, (u8)item->glyphid,
                            item->x0, item->y0, char_color);
        }
        prev_ind = ind;
    }

    end_temp_memory(temp);

    return(0);
}

internal i32
draw_file_view(System_Functions *system, Exchange *exchange,
    View *view, View *active, i32_Rect rect, b32 is_active,
    Render_Target *target, Input_Summary *user_input){

    Models *models = view->models;
    Editing_File *file = view->file;
    i32 result = 0;

    i32 widget_height = 0;
    {
        UI_State state =
            ui_state_init(&view->widget.state, target, 0,
            &models->style, models->global_font.font_id, models->font_set, 0, 0);

        UI_Layout layout;
        begin_layout(&layout, rect);

        switch (view->widget.type){
            case FWIDG_NONE:
            {
                if (file && view->showing_ui == VUI_None){
                    do_file_bar(view, file, &layout, target);
                }

                draw_file_view_queries(view, &state, &layout);
            }break;

            case FWIDG_TIMELINES:
            {
                if (file){
                    i32 undo_count = file->state.undo.undo.edit_count;
                    i32 redo_count = file->state.undo.redo.edit_count;
                    i32 total_count = undo_count + redo_count;
                    undo_shit(0, view, &state, &layout, total_count, undo_count, 0);
                }
                else{
                    view->widget.type = FWIDG_NONE;
                }
            }break;
        }

        widget_height = layout.y - rect.y0;
        ui_finish_frame(&view->widget.state, &state, &layout, rect, 0, 0);
    }
    view->scroll_min_limit = (f32)-widget_height;

    {
        rect.y0 += widget_height;
        target->push_clip(target, rect);

        UI_State state =
            ui_state_init(&view->ui_state, target, user_input,
            &models->style, models->global_font.font_id, models->font_set, &models->working_set, 0);

        UI_Layout layout;
        begin_layout(&layout, rect);

        rect.y0 -= widget_height;

        Super_Color color = {};

        switch (view->showing_ui){
            case VUI_None:
            {
                if (file && file_is_ready(file)){
                    if (view->reinit_scrolling){
                        view_reinit_scrolling(view);
                    }
                    result = draw_file_loaded(view, rect, is_active, target);
                }
            }break;

            case VUI_Theme:
            {
                theme_shit(system, exchange, view, active, &state, &layout, &color);
            }break;

            case VUI_Interactive:
            {
                interactive_shit(system, view, &state, &layout);
            }break;
            case VUI_Menu:
            {
                menu_shit(view, &state, &layout);
            }break;
            case VUI_Config:
            {
                config_shit(view, &state, &layout);
            }break;
        }

        ui_finish_frame(&view->ui_state, &state, &layout, rect, 0, 0);

        target->pop_clip(target);
    }


    return (result);
}

// TODO(allen): Passing this hook and app pointer is a hack. It can go as soon as we start
// initializing files independently of setting them to views.
internal void
kill_file(System_Functions *system, Exchange *exchange, Models *models, Editing_File *file,
    Hook_Function *open_hook, Application_Links *app){
    File_Node *node, *used;

    file_close(system, &models->mem.general, file);
    working_set_free_file(&models->working_set, file);

    used = &models->working_set.used_sentinel;
    node = used->next;

    for (View_Iter iter = file_view_iter_init(&models->layout, file, 0);
        file_view_iter_good(iter);
        iter = file_view_iter_next(iter)){
        if (node != used){
            iter.view->file = 0;
            view_set_file(iter.view, (Editing_File*)node, models, system, open_hook, app, 0);
            node = node->next;
        }
        else{
            iter.view->file = 0;
            view_set_file(iter.view, 0, models, system, open_hook, app, 0);
        }
    }
}

inline void
free_file_view(View *view){
    if (view->line_wrap_y)
        general_memory_free(&view->models->mem.general, view->line_wrap_y);
}

struct Search_Range{
    Buffer_Type *buffer;
    i32 start, size;
};

struct Search_Set{
    Search_Range *ranges;
    i32 count, max;
};

struct Search_Iter{
    String word;
    i32 pos;
    i32 i;
};

struct Search_Match{
    Buffer_Type *buffer;
    i32 start, end;
    b32 found_match;
};

internal void
search_iter_init(General_Memory *general, Search_Iter *iter, i32 size){
    i32 str_max;

    if (iter->word.str == 0){
        str_max = size*2;
        iter->word.str = (char*)general_memory_allocate(general, str_max, 0);
        iter->word.memory_size = str_max;
    }
    else if (iter->word.memory_size < size){
        str_max = size*2;
        iter->word.str = (char*)general_memory_reallocate_nocopy(general, iter->word.str, str_max, 0);
        iter->word.memory_size = str_max;
    }

    iter->i = 0;
    iter->pos = 0;
}

internal void
search_set_init(General_Memory *general, Search_Set *set, i32 set_count){
    i32 max;

    if (set->ranges == 0){
        max = set_count*2;
        set->ranges = (Search_Range*)general_memory_allocate(general, sizeof(Search_Range)*max, 0);
        set->max = max;
    }
    else if (set->max < set_count){
        max = set_count*2;
        set->ranges = (Search_Range*)general_memory_reallocate_nocopy(
            general, set->ranges, sizeof(Search_Range)*max, 0);
        set->max = max;
    }

    set->count = set_count;
}

internal void
search_hits_table_alloc(General_Memory *general, Table *hits, i32 table_size){
    void *mem;
    i32 mem_size;
    
    mem_size = table_required_mem_size(table_size, sizeof(Offset_String));
    if (hits->hash_array == 0){
        mem = general_memory_allocate(general, mem_size, 0);
    }
    else{
        mem = general_memory_reallocate_nocopy(general, hits->hash_array, mem_size, 0);
    }
    table_init_memory(hits, mem, table_size, sizeof(Offset_String));
}

internal void
search_hits_init(General_Memory *general, Table *hits, String_Space *str, i32 table_size, i32 str_size){
    void *mem;
    i32 mem_size;

    if (hits->hash_array == 0){
        search_hits_table_alloc(general, hits, table_size);
    }
    else if (hits->max < table_size){
        mem_size = table_required_mem_size(table_size, sizeof(Offset_String));
        mem = general_memory_reallocate_nocopy(general, hits->hash_array, mem_size, 0);
        table_init_memory(hits, mem, table_size, sizeof(Offset_String));
    }

    if (str->space == 0){
        str->space = (char*)general_memory_allocate(general, str_size, 0);
        str->max = str_size;
    }
    else if (str->max < str_size){
        str->space = (char*)general_memory_reallocate_nocopy(general, str->space, str_size, 0);
        str->max = str_size;
    }

    str->pos = str->new_pos = 0;
    table_clear(hits);
}

internal b32
search_hit_add(General_Memory *general, Table *hits, String_Space *space, char *str, i32 len){
    b32 result;
    i32 new_size;
    Offset_String ostring;
    Table new_hits;

    Assert(len != 0);

    ostring = strspace_append(space, str, len);
    if (ostring.size == 0){
        new_size = Max(space->max*2, space->max + len);
        space->space = (char*)general_memory_reallocate(general, space->space, space->new_pos, new_size, 0);
        ostring = strspace_append(space, str, len);
    }

    Assert(ostring.size != 0);

    if (table_at_capacity(hits)){
        search_hits_table_alloc(general, &new_hits, hits->max*2);
        table_clear(&new_hits);
        table_rehash(hits, &new_hits, space->space, tbl_offset_string_hash, tbl_offset_string_compare);
        general_memory_free(general, hits->hash_array);
        *hits = new_hits;
    }

    if (!table_add(hits, &ostring, space->space, tbl_offset_string_hash, tbl_offset_string_compare)){
        result = 1;
        strspace_keep_prev(space);
    }
    else{
        result = 0;
        strspace_discard_prev(space);
    }

    return(result);
}

internal Search_Match
search_next_match(Partition *part, Search_Set *set, Search_Iter *iter_){
    Search_Match result = {};
    Search_Iter iter = *iter_;
    Search_Range *range;
    Temp_Memory temp;
    char *spare;
    i32 start_pos, end_pos, count;

    temp = begin_temp_memory(part);
    spare = push_array(part, char, iter.word.size);

    count = set->count;
    for (; iter.i < count;){
        range = set->ranges + iter.i;

        end_pos = range->start + range->size;

        if (iter.pos + iter.word.size < end_pos){
            start_pos = Max(iter.pos, range->start);
            result.start = buffer_find_string(range->buffer, start_pos, end_pos, iter.word.str, iter.word.size, spare);

            if (result.start < end_pos){
                iter.pos = result.start + 1;
                if (result.start == 0 || !char_is_alpha_numeric(buffer_get_char(range->buffer, result.start - 1))){
                    result.end = buffer_seek_word_right_assume_on_word(range->buffer, result.start);
                    if (result.end < end_pos){
                        result.found_match = 1;
                        result.buffer = range->buffer;
                        iter.pos = result.end;
                        break;
                    }
                }
            }
            else{
                ++iter.i, iter.pos = 0;
            }
        }
        else{
            ++iter.i, iter.pos = 0;
        }
    }
    end_temp_memory(temp);

    *iter_ = iter;

    return(result);
}

inline void
view_change_size(System_Functions *system, General_Memory *general, View *view){
    if (view->file){
        view_measure_wraps(system, general, view);
        view->cursor = view_compute_cursor_from_pos(view, view->cursor.pos);
    }
}

struct Live_Views{
    View *views;
    View free_sentinel;
    i32 count, max;
};

internal View_And_ID
live_set_alloc_view(Live_Views *live_set, Panel *panel, Models *models){
    View_And_ID result = {};

    Assert(live_set->count < live_set->max);
    ++live_set->count;

    result.view = live_set->free_sentinel.next;
    result.id = (i32)(result.view - live_set->views);

    dll_remove(result.view);
    memset(result.view, 0, sizeof(View));
    result.view->id = result.id;

    result.view->in_use = 1;
    panel->view = result.view;
    result.view->panel = panel;

    result.view->models = models;
    result.view->scrub_max = 1;

    // TODO(allen): Make "interactive" mode customizable just like the query bars!
    result.view->query = make_fixed_width_string(result.view->query_);
    result.view->dest = make_fixed_width_string(result.view->dest_);

    init_query_set(&result.view->query_set);

    return(result);
}

inline void
live_set_free_view(System_Functions *system, Exchange *exchange, Live_Views *live_set, View *view){
    Assert(live_set->count > 0);
    --live_set->count;
    free_file_view(view);
    dll_insert(&live_set->free_sentinel, view);
    view->in_use = 0;
}

// BOTTOM