CUSTOM_COMMAND_SIG(byp_startup)
CUSTOM_DOC("Responding to a startup event")
{
    ProfileScope(app, "byp startup");
    User_Input input = get_current_input(app);
    if(match_core_code(&input, CoreCode_Startup)){
    String_Const_u8_Array file_names = input.event.core.file_names;
    load_themes_default_folder(app);

    print_message(app, string_u8_litexpr("Welcome to " VERSION "\n"));
    Scratch_Block scratch(app);

    Face_Description description = get_face_description(app, 0);
    load_config_and_apply(app, &global_config_arena, description.parameters.pt_size, description.parameters.hinting);

    // open command line files
    Buffer_ID buffer = 0;
    String_Const_u8 hot_directory = push_hot_directory(app, scratch);
    for (i32 i = 0; i < file_names.count; i += 1){
    Temp_Memory_Block temp(scratch);
    String_Const_u8 input_name = file_names.vals[i];
    String_Const_u8 full_name = push_u8_stringf(scratch, "%S/%S", hot_directory, input_name);
    Buffer_ID new_buffer = create_buffer(app, full_name, BufferCreate_NeverNew|BufferCreate_MustAttachToFile);
    if (new_buffer == 0){
    new_buffer = create_buffer(app, input_name, 0);
    }
    if (new_buffer != 0 && buffer == 0){
    buffer = new_buffer;
    }
    }
    if (buffer == 0){
    buffer = buffer_identifier_to_id(app, buffer_identifier(string_u8_litexpr("*scratch*")));
    }

    View_ID view = get_active_view(app, Access_Always);
    new_view_settings(app, view);
    view_set_buffer(app, view, buffer, 0);
    vim_set_file_register(app, buffer);

    // NOTE/TODO: (BYP) This is a hack until buffer_peek has it's own View_ID (allows comp jump list)
    byp_get_or_open_build_panel(app); // Disabled to use regular build panel

    if(def_get_config_b32(vars_save_string_lit("automatically_load_project"))){
    load_project(app);
    }
    }

    // NOTE(nasr): disable audio
    // def_audio_init();

    def_enable_virtual_whitespace = def_get_config_b32(vars_save_string_lit("enable_virtual_whitespace"));
    clear_all_layouts(app);

    Face_Description desc = get_global_face_description(app);
    desc.parameters.pt_size -= 2;
    desc.parameters.bold = 1;
    desc.parameters.italic = 1;
    desc.parameters.hinting = 0;
    byp_small_italic_face = try_create_new_face(app, &desc);

    desc.parameters.pt_size = 0;
    desc.parameters.bold = 0;
    byp_minimal_face = try_create_new_face(app, &desc);

    // NOTE(nasr): disabled fullscreen
    system_set_fullscreen(false);
    set_window_title(app, string_u8_litexpr("4coder - nasr"));

    byp_relative_numbers = 1;
    byp_show_hex_colors = 1;
    byp_show_scrollbars = 0;

    Color_Table *table = get_color_table_by_name(string_u8_litexpr("theme-nasr"));
    if(table == 0){ table = &default_color_table; }
    target_color_table = byp_init_color_table(app);
    cached_color_table = byp_init_color_table(app);
    byp_copy_color_table(&target_color_table, *table);
    byp_copy_color_table(&cached_color_table, *table);
    active_color_table = cached_color_table;
    }

    function void
    byp_tick(Application_Links *app, Frame_Info frame_info){
    ProfileScope(app, "byp tick");
    code_index_update_tick(app);
    if(tick_all_fade_ranges(app, frame_info.animation_dt)){
    animate_in_n_milliseconds(app, 0);
    }

    vim_animate_filebar(app, frame_info);
    vim_animate_cursor(app, frame_info);
    fold_tick(app, frame_info);
    byp_tick_colors(app, frame_info);

    vim_cursor_blink += frame_info.animation_dt;

    b32 enable_virtual_whitespace = def_get_config_b32(vars_save_string_lit("enable_virtual_whitespace"));
    if(enable_virtual_whitespace != def_enable_virtual_whitespace){
    def_enable_virtual_whitespace = enable_virtual_whitespace;
    clear_all_layouts(app);
    }
    }


    function void
    byp_render_caller(Application_Links *app, Frame_Info frame_info, View_ID view_id){
    ProfileScope(app, "byp render caller");

    Buffer_ID buffer = view_get_buffer(app, view_id, Access_Always);
    Face_ID face_id = get_face_id(app, 0);
    Face_Metrics face_metrics = get_face_metrics(app, face_id);
    f32 line_height = face_metrics.line_height;
    f32 digit_advance = face_metrics.decimal_digit_advance;

    Rect_f32 region = view_get_screen_rect(app, view_id);
    Rect_f32 prev_clip = draw_set_clip(app, region);

    Rect_f32 global_rect = global_get_screen_rectangle(app);
    f32 filebar_y = global_rect.y1 - 2.f*line_height - vim_cur_filebar_offset;
    {
        Rect_f32 back_rect = region;
        if(vim_lister_view_id != 0 && vim_lister_view_id != view_id){
            back_rect.y1 = Min(back_rect.y1, filebar_y);
        }
        draw_rectangle_fcolor(app, back_rect, 0.f, fcolor_id(defcolor_back));
    }

    if(region.y1 >= filebar_y){ region.y1 = filebar_y; }

    region = vim_draw_query_bars(app, region, view_id, face_id);

    {
    Rect_f32_Pair pair = layout_file_bar_on_bot(region, line_height);
    pair.b = rect_split_top_bottom(pair.b, line_height).a;
    vim_draw_filebar(app, view_id, buffer, frame_info, face_id, pair.b);
    region = pair.a;
    }

    Rect_f32_Pair scrollbar_pair = byp_layout_scrollbars(region, digit_advance);
    i64 show_scrollbar = false;
    view_get_setting(app, view_id, ViewSetting_ShowScrollbar, &show_scrollbar);
    show_scrollbar &= byp_show_scrollbars;
    if(show_scrollbar){
    region = scrollbar_pair.a;
    }
    draw_set_clip(app, region);

    // Draw borders
    if(region.x0 > global_rect.x0){
    Rect_f32_Pair border_pair = rect_split_left_right(region, 2.f);
    draw_rectangle_fcolor(app, border_pair.a, 0.f, fcolor_id(defcolor_margin));
    region = border_pair.b;
    }
    if(region.x1 < global_rect.x1){
    Rect_f32_Pair border_pair = rect_split_left_right_neg(region, 2.f);
    draw_rectangle_fcolor(app, border_pair.b, 0.f, fcolor_id(defcolor_margin));
    region = border_pair.a;
    }
    region.y0 += 3.f;


    if(show_fps_hud){
    Rect_f32_Pair pair = layout_fps_hud_on_bottom(region, line_height);
    draw_fps_hud(app, frame_info, face_id, pair.max);
    region = pair.min;
    animate_in_n_milliseconds(app, 1000);
    }


    Rect_f32_Pair pair = {};

    // NOTE(allen): layout line numbers
    b32 show_line_number_margins = def_get_config_b32(vars_save_string_lit("show_line_number_margins"));
    pair = (show_line_number_margins ?
    (byp_relative_numbers ?
    vim_line_number_margin(app, buffer, region, digit_advance) :
    layout_line_number_margin(app, buffer, region, digit_advance)) :
    rect_split_left_right(region, digit_advance));
    Rect_f32 line_number_rect = pair.min;
    region = pair.max;

    Buffer_Scroll scroll = view_get_buffer_scroll(app, view_id);
    Buffer_Point_Delta_Result delta = delta_apply(app, view_id, frame_info.animation_dt, scroll);
    if(!block_match_struct(&scroll.position, &delta.point)){
    Vec2_f32 d = view_point_difference(app, view_id, delta.point, scroll.position);
    vim_cur_cursor_pos -= d;
    vim_nxt_cursor_pos -= d;
    block_copy_struct(&scroll.position, &delta.point);
    view_set_buffer_scroll(app, view_id, scroll, SetBufferScroll_NoCursorChange);
    }
    if(delta.still_animating){ animate_in_n_milliseconds(app, 0); }
    Text_Layout_ID text_layout_id = text_layout_create(app, buffer, region, scroll.position);

    if(show_line_number_margins){
    if(byp_relative_numbers)
    vim_draw_rel_line_number_margin(app, view_id, buffer, face_id, text_layout_id, line_number_rect);
    else
    vim_draw_line_number_margin(app, view_id, buffer, face_id, text_layout_id, line_number_rect);
    }else{
    draw_rectangle_fcolor(app, line_number_rect, 0.f, fcolor_id(defcolor_back));
    }

    if(show_scrollbar){
    byp_draw_scrollbars(app, view_id, buffer, text_layout_id, scrollbar_pair.b);
    }

    byp_render_buffer(app, view_id, face_id, buffer, text_layout_id, region, frame_info);

    text_layout_free(app, text_layout_id);
    draw_set_clip(app, prev_clip);
    }

    function Rect_f32
    byp_buffer_region(Application_Links *app, View_ID view_id, Rect_f32 region){
    ProfileScope(app, "byp buffer region");
    Buffer_ID buffer = view_get_buffer(app, view_id, Access_Always);
    Face_ID face_id = get_face_id(app, 0);
    Face_Metrics metrics = get_face_metrics(app, face_id);
    f32 line_height = metrics.line_height;
    f32 digit_advance = metrics.decimal_digit_advance;

    Rect_f32 global_rect = global_get_screen_rectangle(app);
    f32 filebar_y = global_rect.y1 - 2.f*line_height - vim_cur_filebar_offset;
    if(region.y1 >= filebar_y){ region.y1 = filebar_y; }

    Query_Bar *space[32];
    Query_Bar_Ptr_Array query_bars = {};
    query_bars.ptrs = space;
    if(get_active_query_bars(app, view_id, ArrayCount(space), &query_bars)){
    region = layout_query_bar_on_bot(region, line_height, query_bars.count).min;
    }

    region = layout_file_bar_on_bot(region, line_height).min;

    i64 show_scrollbar = false;
    view_get_setting(app, view_id, ViewSetting_ShowScrollbar, &show_scrollbar);
    if(byp_show_scrollbars && show_scrollbar){
    region = byp_layout_scrollbars(region, digit_advance).a;
    }

    if(region.x0 > global_rect.x0){
    region = rect_split_left_right(region, 2.f).b;
    }
    if(region.x1 < global_rect.x1){
    region = rect_split_left_right_neg(region, 2.f).a;
    }
    region.y0 += 3.f;

    if(show_fps_hud){
    region = layout_fps_hud_on_bottom(region, line_height).min;
    }

    b32 show_line_number_margins = def_get_config_b32(vars_save_string_lit("show_line_number_margins"));
    region = (show_line_number_margins ?
    (byp_relative_numbers ?
    vim_line_number_margin(app, buffer, region, digit_advance) :
    layout_line_number_margin(app, buffer, region, digit_advance)) :
    rect_split_left_right(region, digit_advance)).max;

    return region;
    }

    BUFFER_HOOK_SIG(byp_file_save){
    #if 1
    b32 auto_indent = def_get_config_b32(vars_save_string_lit("automatically_indent_text_on_save"));
    b32 is_virtual = def_get_config_b32(vars_save_string_lit("enable_virtual_whitespace"));
    if (auto_indent && is_virtual){
    auto_indent_buffer(app, buffer_id, buffer_range(app, buffer_id));
    // byp_reformat_buffer(app, buffer_id);
    }
    b32 clear_blanks = def_get_config_b32(vars_save_string_lit("clear_blank_lines"));
    Clean_All_Lines_Mode mode = (clear_blanks ? CleanAllLinesMode_RemoveBlankLines : CleanAllLinesMode_LeaveBlankLines);
    clean_all_lines_buffer(app, buffer_id, mode);

    vim_file_save(app, buffer_id);

    Scratch_Block scratch(app);
    String_Const_u8 path = push_buffer_file_name(app, scratch, buffer_id);
    String_Const_u8 name = string_front_of_path(path);

    if (byp_is_theme(name)){
    Color_Table color_table = make_color_table(app, &global_theme_arena);
    Config *config = theme_parse__buffer(app, scratch, buffer_id, &global_theme_arena, &color_table);
    String_Const_u8 error_text = config_stringize_errors(app, scratch, config);
    comp_error(app, error_text);

    if (error_text.size > 0){
    print_message(app, error_text);
    printf_message(app, scratch, "There appears to be a problem parsing %S; no theme change applied\n", path);
    }
    else{
    print_message(app, string_u8_litexpr("Copied color theme\n"));
    byp_copy_color_table(&target_color_table, color_table);
    }
    }

    if (string_match(name, string_u8_litexpr("config.4coder"))){
    View_ID view = get_active_view(app, Access_Always);
    view_enqueue_command_function(app, view, byp_reload_config);
    }

    if (string_match(name, string_u8_litexpr("project.4coder"))){
    View_ID view = get_active_view(app, Access_Always);
    view_enqueue_command_function(app, view, zbyp_reload_project);
    }

    #endif
    return 0;
    }

    BUFFER_HOOK_SIG(byp_begin_buffer){
    ProfileScope(app, "byp begin buffer");

    Scratch_Block scratch(app);

    b32 treat_as_code = false;
    String_Const_u8 file_name = push_buffer_file_name(app, scratch, buffer_id);
    if (file_name.size > 0){
    String_Const_u8 treat_as_code_string = def_get_config_string(scratch, vars_save_string_lit("treat_as_code"));
    String_Const_u8_Array extensions = parse_extension_line_to_extension_list(app, scratch, treat_as_code_string);
    String_Const_u8 ext = string_file_extension(file_name);
    for (i32 i = 0; i < extensions.count; ++i){
    if (string_match(ext, extensions.strings[i])){
    if (string_match(ext, string_u8_litexpr("cpp"))    ||
    string_match(ext, string_u8_litexpr("h"))      ||
    string_match(ext, string_u8_litexpr("c"))      ||
    string_match(ext, string_u8_litexpr("hpp"))    ||
    string_match(ext, string_u8_litexpr("rs"))     ||
    string_match(ext, string_u8_litexpr("jr"))     ||
    string_match(ext, string_u8_litexpr("hlsl"))   ||
    string_match(ext, string_u8_litexpr("4coder")) ||
    string_match(ext, string_u8_litexpr("cc"))
    ){
    treat_as_code = true;
    }
    treat_as_code = true;
    break;
    }
    }
    }

    String_ID file_map_id = vars_save_string_lit("keys_file");
    String_ID code_map_id = vars_save_string_lit("keys_code");

    Command_Map_ID map_id = (treat_as_code)?(code_map_id):(file_map_id);
    Managed_Scope scope = buffer_get_managed_scope(app, buffer_id);
    Command_Map_ID *map_id_ptr = scope_attachment(app, scope, buffer_map_id, Command_Map_ID);
    *map_id_ptr = map_id;

    Line_Ending_Kind setting = guess_line_ending_kind_from_buffer(app, buffer_id);
    Line_Ending_Kind *eol_setting = scope_attachment(app, scope, buffer_eol_setting, Line_Ending_Kind);
    *eol_setting = setting;

    // NOTE(allen): Decide buffer settings
    b32 wrap_lines = true;
    b32 use_lexer = false;
    if (treat_as_code){
    wrap_lines = def_get_config_b32(vars_save_string_lit("enable_code_wrapping"));
    use_lexer = true;
    }

    String_Const_u8 buffer_name = push_buffer_base_name(app, scratch, buffer_id);
    if (buffer_name.size > 0 && buffer_name.str[0] == '*' && buffer_name.str[buffer_name.size - 1] == '*'){
    wrap_lines = def_get_config_b32(vars_save_string_lit("enable_output_wrapping"));
    }

    if (use_lexer){
    ProfileBlock(app, "begin buffer kick off lexer");
    Async_Task *lex_task_ptr = scope_attachment(app, scope, buffer_lex_task, Async_Task);
    *lex_task_ptr = async_task_no_dep(&global_async_system, do_full_lex_async, make_data_struct(&buffer_id));
    }

    {
    b32 *wrap_lines_ptr = scope_attachment(app, scope, buffer_wrap_lines, b32);
    *wrap_lines_ptr = wrap_lines;
    }

    if (use_lexer){
    buffer_set_layout(app, buffer_id, layout_virt_indent_index_generic);
    }
    else{
    if (treat_as_code){
    buffer_set_layout(app, buffer_id, layout_virt_indent_literal_generic);
    }
    else{
    buffer_set_layout(app, buffer_id, layout_generic);
    }
    }


    fold_begin_buffer_inner(app, buffer_id);
    fold_set_layouts(app, buffer_id, use_lexer, treat_as_code);
    vim_begin_buffer_inner(app, buffer_id);
    return 0;
    }

    BUFFER_HOOK_SIG(byp_new_file){
    Scratch_Block scratch(app);
    String_Const_u8 file_name = push_buffer_base_name(app, scratch, buffer_id);
    if(string_match(string_postfix(file_name, 4), string_u8_litexpr(".bat"))){
    Buffer_Insertion insert = begin_buffer_insertion_at_buffered(app, buffer_id, 0, scratch, KB(16));
    insertf(&insert, "@echo off" "\n");
    end_buffer_insertion(&insert);
    return 0;
    }

    return 0;
}