function void
byp_draw_tooltip_rect(Application_Links *app, Rect_f32 rect){
  draw_rectangle_fcolor(app, rect, 3.f, fcolor_id(defcolor_back));
  draw_rectangle_outline_fcolor(app, rect, 3.f, 2.f, fcolor_id(defcolor_ghost_character));
}

function Vec2_f32
byp_draw_pos_context_tokens(Application_Links *app, Face_ID face,
                                      String_Const_u8 backing_string,
                                      Token_Array tokens, b32 do_render,
                                      int highlight_arg, Vec2_f32 text_position,
                                      f32 max_x)
{
    Scratch_Block scratch(app);
    Vec2_f32 starting_text_pos = text_position;
    Face_Metrics metrics = get_face_metrics(app, face);

    Token_Iterator_Array it = token_iterator_pos(0, &tokens, 0);
    b32 found_first_open_paren = 0;
    for(int arg_idx = 0;;)
    {
        Token *token = token_it_read(&it);
        if(token == 0) { break; }

        if(token->kind == TokenBaseKind_Whitespace)
        {
            text_position.x += get_string_advance(app, face, string_u8_litexpr(" "));
        }
        else
        {
            ARGB_Color color = finalize_color(defcolor_text_default, 0);
            if(token->kind == TokenBaseKind_StatementClose)
            {
                String_Const_u8 str = string_substring(backing_string, Ii64(token));
                if(string_match(str, S8Lit(",")))
                {
                    arg_idx += 1;
                }
            }
            else if(token->kind == TokenBaseKind_ParentheticalOpen)
            {
                found_first_open_paren = 1;
            }

            // NOTE(rjf): Highlight
            b32 highlight = 0;
            if(found_first_open_paren && arg_idx == highlight_arg &&
               (token->kind == TokenBaseKind_Identifier ||
                token->kind == TokenBaseKind_Operator ||
                token->kind == TokenBaseKind_Keyword))
            {
                color = finalize_color(defcolor_preproc, 0); // TODO: get a different color for this one
                highlight = 1;
            }

            Vec2_f32 start_pos = text_position;
            String_Const_u8 token_string = string_substring(backing_string,
                                                            Ii64(token->pos, token->pos+token->size));
            f32 string_advance = get_string_advance(app, face, token_string);
            if(text_position.x + string_advance >= max_x)
            {
                text_position.x = starting_text_pos.x;
                text_position.y += metrics.line_height;
            }
            if(do_render)
            {
                draw_string(app, face, token_string, text_position, color);
            }
            text_position.x += string_advance;
            if(highlight)
            {
                if(do_render)
                {
                    draw_rectangle(app, Rf32(start_pos.x, start_pos.y + metrics.line_height,
                                             text_position.x, start_pos.y + metrics.line_height + 2.f),
                                   1.f, color);
                }
            }
        }

        if(token_it_inc_all(&it) == 0)
        {
            break;
        }
    }
    return text_position;
}

function b32
byp_code_index_find_function_note(Application_Links *app, String_Const_u8 query, Buffer_ID *out_buffer, Range_i64 *out_pos){
  b32 found = false;
  code_index_lock();
  for(Buffer_ID b = get_buffer_next(app, 0, Access_Always);
      b != 0;
      b = get_buffer_next(app, b, Access_Always))
  {
    Code_Index_File *file = code_index_get_file(b);
    if(file != 0){
      foreach(i, file->note_array.count){
        Code_Index_Note *note = file->note_array.ptrs[i];
        if((note->note_kind == CodeIndexNote_Function || note->note_kind == CodeIndexNote_Macro) &&
           string_match(note->text, query))
        {
          *out_buffer = b;
          *out_pos = note->pos;
          found = true;
          goto done;
        }
      }
    }
  }
  done:;
  code_index_unlock();
  return found;
}

function void
byp_draw_pos_context_call(Application_Links *app, Face_ID face, Face_Metrics metrics, f32 padding,
                          Rect_f32 view_rect, Vec2_f32 *tooltip_position,
                          String_Const_u8 query, i32 arg_idx)
{
  Scratch_Block scratch(app);
  Buffer_ID def_buffer = 0;
  Range_i64 def_pos = {};
  if(!byp_code_index_find_function_note(app, query, &def_buffer, &def_pos)){ return; }

  // NOTE: Find range of definition + params
  Range_i64 definition_range = def_pos;
  {
    Token_Array defbuffer_tokens = get_token_array_from_buffer(app, def_buffer);
    Token_Iterator_Array it = token_iterator_pos(0, &defbuffer_tokens, def_pos.min);
    i32 paren_nest = 0;
    for(;token_it_inc_all(&it);)
    {
      Token *token = token_it_read(&it);
      if(token)
      {
        if(token->kind == TokenBaseKind_ParentheticalOpen)
        {
          paren_nest += 1;
        }
        if(token->kind == TokenBaseKind_ParentheticalClose)
        {
          paren_nest -= 1;
          if(paren_nest == 0)
          {
            definition_range.max = token->pos + token->size;
            break;
          }
        }
      }
    }
  }

  String_Const_u8 definition_string = push_buffer_range(app, scratch, def_buffer, definition_range);
  Token_Array definition_tokens = token_array_from_text(app, scratch, definition_string);

  // NOTE: Calculate needed size for this tooltip.
  f32 max_x = view_rect.x1-view_rect.x0;
  Vec2_f32 end_draw_position = byp_draw_pos_context_tokens(app, face, definition_string, definition_tokens,
                                                            false, 0, V2f32(0, 0), max_x);
  Vec2_f32 needed_size =
  {
    (end_draw_position.y > 0) ? max_x : end_draw_position.x,
    end_draw_position.y,
  };

  Rect_f32 draw_rect =
  {
    tooltip_position->x,
    tooltip_position->y,
    tooltip_position->x + needed_size.x + 2*padding,
    tooltip_position->y + needed_size.y + metrics.line_height + 2*padding,
  };
  if(draw_rect.x1 > view_rect.x1)
  {
    f32 width = rect_width(draw_rect);
    draw_rect.x0 = (f32)(int)(view_rect.x1 - width);
    draw_rect.x1 = view_rect.x1;
  }
  if(draw_rect.y1 > view_rect.y1)
  {
    f32 height = rect_height(draw_rect);
    draw_rect.y0 = (f32)(int)(view_rect.y1 - height);
    draw_rect.y1 = view_rect.y1;
  }

  byp_draw_tooltip_rect(app, draw_rect);

  // NOTE: Render tokens of definition
  Vec2_f32 text_position =
  {
    draw_rect.x0 + padding,
    draw_rect.y0 + padding,
  };
  byp_draw_pos_context_tokens(app, face, definition_string, definition_tokens,
                              true, arg_idx, text_position, view_rect.x1);

  tooltip_position->y += draw_rect.y1 - draw_rect.y0;
}

// NOTE(BYP): direct port of fleury's F4_CPP_PosContext, walking backward from the
// cursor to find (nested) enclosing calls and which comma-separated argument the
// cursor sits in, without going through a per-language dispatch table -- byp only
// ever lexes/indexes C/C++ (see 4coder_default_hooks.cpp), so there's nothing to
// dispatch on.
function void
byp_draw_pos_context(Application_Links *app, View_ID view, Buffer_ID buffer,
                     Text_Layout_ID text_layout_id, i64 pos)
{
  if(def_get_config_b32(vars_save_string_lit("byp_disable_pos_context")))
  {
    return;
  }

  ProfileScope(app, "[BYP] Pos Context Rendering");
  Scratch_Block scratch(app);

  Token_Array tokens = get_token_array_from_buffer(app, buffer);
  if(tokens.tokens == 0){ return; }

  Rect_f32 view_rect = view_get_screen_rect(app, view);
  Face_ID face = byp_small_italic_face;
  Face_Metrics metrics = get_face_metrics(app, face);
  f32 padding = 4.f;

  Vec2_f32 tooltip_position =
  {
    global_cursor_rect.x0,
    global_cursor_rect.y1,
  };

  Token_Iterator_Array it = token_iterator_pos(0, &tokens, pos);
  i32 paren_nest = 0;
  i32 arg_idx = 0;
  for(i32 i = 0, calls_found = 0; calls_found < 4; i += 1)
  {
    Token *token = token_it_read(&it);
    if(token == 0){ break; }

    if(paren_nest == 0 &&
       token->kind == TokenBaseKind_ParentheticalOpen &&
       token_it_dec_non_whitespace(&it))
    {
      Token *name = token_it_read(&it);
      if(name && name->kind == TokenBaseKind_Identifier)
      {
        String_Const_u8 query = push_buffer_range(app, scratch, buffer, Ii64(name));
        byp_draw_pos_context_call(app, face, metrics, padding, view_rect, &tooltip_position, query, arg_idx);
        calls_found += 1;
        arg_idx = 0;
      }
    }
    else if(token->kind == TokenBaseKind_ParentheticalOpen)
    {
      paren_nest -= 1;
    }
    else if(token->kind == TokenBaseKind_ParentheticalClose && i > 0)
    {
      paren_nest += 1;
    }
    else if(paren_nest == 0 && i > 0 && token->kind == TokenBaseKind_StatementClose &&
            buffer_get_char(app, buffer, token->pos) == ',')
    {
      arg_idx += 1;
    }

    if(!token_it_dec_non_whitespace(&it)){ break; }
  }
}

// TODO(BYP): param number underlining (account for variadic ...)
function void
byp_draw_function_preview_inner(Application_Links *app, Buffer_ID buffer, Range_f32 x_range, Range_i64 range, i64 pos, i32 count){
  Scratch_Block scratch(app);
  String_Const_u8 query = push_token_or_word_under_pos(app, scratch, buffer, range.min-1);

  Buffer_ID target_buffer = 0;
  Range_i64 target_range = {};
  if(!byp_code_index_find_function_note(app, query, &target_buffer, &target_range)){ return; }

  target_range.max = vim_scan_bounce(app, target_buffer, target_range.max, Scan_Forward) + 1;

  Range_i64 sig_underline = target_range;

  String_Const_u8 sig = push_buffer_range(app, scratch, target_buffer, target_range);
  sig = string_condense_whitespace(scratch, sig);

  Face_Metrics metrics = get_face_metrics(app, byp_small_italic_face);
  f32 wid = 2.f;
  f32 pad = 2.f;
  Rect_f32 rect = {};
  rect.p0 = vim_cur_cursor_pos + V2f32(0, 2.f + count*(metrics.line_height + pad + 2.f*wid));
  rect.p1 = rect.p0 + V2f32(sig.size*metrics.space_advance, metrics.line_height);
  f32 x_offset = ((rect.x1 > x_range.max)*(rect.x1 - x_range.max) -
                  (rect.x0 < x_range.min)*(rect.x0 - x_range.max));
  rect.x0 -= x_offset;
  rect.x1 -= x_offset;

  Rect_f32 underline = rect;
  underline.x0 += metrics.space_advance*(sig_underline.min - target_range.min);
  underline.x1 = underline.x0 + metrics.space_advance*(range_size(sig_underline));
  underline.y1 -= 1.f;
  underline.y0 = underline.y1 - 1.f;

  rect = rect_inner(rect, -pad);
  draw_rectangle_fcolor(app, rect, 3.f, fcolor_id(defcolor_back));
  rect.x0 -= pad;
  rect.x1 += pad;
  draw_rectangle_outline_fcolor(app, rect, 3.f, wid, fcolor_id(defcolor_ghost_character));
  //draw_rectangle_outline_fcolor(app, underline, 3.f, wid, fcolor_id(defcolor_ghost_character));
  draw_string(app, byp_small_italic_face, sig, rect.p0 + (pad + wid)*V2f32(1,1), fcolor_id(defcolor_ghost_character));
}

function void
byp_draw_function_preview(Application_Links *app, Buffer_ID buffer, Range_f32 x_range, i64 pos){

  Token_Array token_array = get_token_array_from_buffer(app, buffer);
  if(token_array.tokens == 0){ return; }
  Token_Iterator_Array it = token_iterator_pos(0, &token_array, pos);
  Token *token = token_it_read(&it);

  if(token->kind == TokenBaseKind_ParentheticalOpen){ pos = token->pos + token->size; }
  else if(token_it_dec_all(&it)){
    token = token_it_read(&it);
    if(token->kind == TokenBaseKind_ParentheticalClose && pos == token->pos + token->size){
      pos = token->pos;
    }
  }

  Scratch_Block scratch(app);
  Range_i64_Array ranges = get_enclosure_ranges(app, scratch, buffer, pos, FindNest_Paren);
  i32 count = 0;
  foreach(i, ranges.count){
    Token_Iterator_Array cur_it = token_iterator_pos(0, &token_array, ranges.ranges[i].min-1);
    token = token_it_read(&cur_it);
    if(token->kind == TokenBaseKind_Identifier){
      byp_draw_function_preview_inner(app, buffer, x_range, ranges.ranges[i], pos, count++);
    }
  }
}

function void
byp_hex_color_preview(Application_Links *app, Buffer_ID buffer_id, Text_Layout_ID text_layout_id){
  Scratch_Block scratch(app);
  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);
  u8 *text = push_buffer_range(app, scratch, buffer_id, visible_range).str;
  foreach(i, range_size(visible_range)-9){
    byp_hex_scan:
    if(text[i] != '0' || text[i+1] != 'x'){ continue; }
    foreach(j, 8){
      char c = text[i+2+j];
      if(!('0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F')){
        i+=9; goto byp_hex_scan;
      }
    }
    Range_i64 hex_range = Ii64_size(i+visible_range.min, 10);
    u32 c = u32(string_to_integer(SCu8(text+i+2, 8), 16));
    f32 avg = (((c >> 16) & 0xFF) + ((c >> 8) & 0xFF) + (c & 0xFF))/3.f;

    u32 contrast = 0xFF000000 | (i32(avg > 110.f)-1);
    paint_text_color(app, text_layout_id, hex_range, contrast);
    Rect_f32 rect_left  = text_layout_character_on_screen(app, text_layout_id, hex_range.min);
    Rect_f32 rect_right = text_layout_character_on_screen(app, text_layout_id, hex_range.max-1);
    Rect_f32 rect = rect_union(rect_left, rect_right);
    rect = rect_inner(rect, -1.f);
    draw_rectangle(app, rect, 8.f, c);
    draw_rectangle_outline(app, rect_inner(rect, -2.f), 8.f, 2.1f, contrast);
  }
}

function Rect_f32_Pair
byp_layout_scrollbars(Rect_f32 region, f32 digit_advance){ return rect_split_left_right_neg(region, 1.25f*digit_advance); }

function void
byp_draw_scrollbars(Application_Links *app, View_ID view, Buffer_ID buffer, Text_Layout_ID text_layout_id, Rect_f32 region){
  Rect_f32 prev_clip = draw_set_clip(app, region);
  f32 region_height = rect_height(region);
  u64 cursor_roundness_100 = def_get_config_u64(app, vars_save_string_lit("cursor_roundness"));
  f32 roundness = rect_width(region)*cursor_roundness_100*0.0075f;

  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);
  i64 line_count = buffer_get_line_count(app, buffer);
  f32 line_diff_y = clamp(5.f, region_height*(1.f/line_count), 10.f);

  i64 top_line    = get_line_number_from_pos(app, buffer, visible_range.min)-1;
  i64 bot_line    = get_line_number_from_pos(app, buffer, visible_range.max)-1;
  i64 cursor_line = get_line_number_from_pos(app, buffer, view_get_cursor_pos(app, view))-1;
  i64 mark_line   = get_line_number_from_pos(app, buffer, view_get_mark_pos(app, view))-1;

  draw_rectangle_fcolor(app, region, 0.f, fcolor_id(defcolor_highlight_cursor_line));
  {
    f32 top_y = region_height*(f32(top_line)/(line_count));
    f32 bot_y = region_height*(f32(bot_line)/(line_count));
    Rect_f32 rect = Rf32(region.x0, top_y, region.x1, bot_y);
    draw_rectangle_fcolor(app, rect, roundness, fcolor_id(defcolor_line_numbers_text));
  }

  {
    f32 top_y = region_height*(f32(cursor_line)/(line_count));
    f32 bot_y = top_y + 3.f*line_diff_y;
    Rect_f32 rect = Rf32(region.x0, top_y, region.x1, bot_y);
    draw_rectangle_fcolor(app, rect, roundness, fcolor_id(defcolor_cursor));
  }

  {
    f32 top_y = region_height*(f32(mark_line)/(line_count));
    f32 bot_y = top_y + 3.f*line_diff_y;
    Rect_f32 rect = Rf32(region.x0, top_y, region.x1, bot_y);
    draw_rectangle_fcolor(app, rect, roundness, fcolor_id(defcolor_mark));
  }
  draw_set_clip(app, prev_clip);
}

function void
draw_scope_range(Application_Links *app, View_ID view, Buffer_ID buffer, Text_Layout_ID text_layout_id, Range_i64 range, f32 x_off, f32 wid, FColor color){
  range.max -= 1;
  // exclude ifdef scopes
  u8 c0 = buffer_get_char(app, buffer, range.min);
  u8 c1 = buffer_get_char(app, buffer, range.max);
  if((c0 != '{' && c0 != '(') || (c1 != '}' && c1 != ')')){ return; }
  paint_text_color_pos(app, text_layout_id, range.min, color);
  paint_text_color_pos(app, text_layout_id, range.max, color);

  i64 line0 = get_line_number_from_pos(app, buffer, range.min);
  i64 line1 = get_line_number_from_pos(app, buffer, range.max);
  if(line0 == line1){ return; }

  Rect_f32 line_rect = vim_get_abs_block_rect(app, view, buffer, text_layout_id, range);
  line_rect.p0 -= V2f32(3.f, 4.f);
  Rect_f32 region = line_rect;
  region.x1 = region.x0 + x_off;

  Rect_f32 prev_clip = draw_set_clip(app, region);
  draw_set_clip(app, rect_intersect(region, prev_clip));

  draw_rectangle_outline_fcolor(app, line_rect, 1.5f*wid, wid, color);

  draw_set_clip(app, prev_clip);
}

function void
byp_draw_scope_brackets(Application_Links *app, View_ID view, Buffer_ID buffer, Text_Layout_ID text_layout_id, Rect_f32 region, i64 pos){

  Token_Array token_array = get_token_array_from_buffer(app, buffer);
  if(token_array.tokens == 0){ return; }
  {
    Token_Iterator_Array it = token_iterator_pos(0, &token_array, pos);
    Token *token = token_it_read(&it);

    if(token->kind == TokenBaseKind_ScopeOpen){ pos = token->pos + token->size; }
    else if(token_it_dec_all(&it)){
      token = token_it_read(&it);
      if(token->kind == TokenBaseKind_ScopeClose && pos == token->pos + token->size){
        pos = token->pos;
      }
    }
  }

  Scratch_Block scratch(app);
  Range_i64_Array ranges = get_enclosure_ranges(app, scratch, buffer, pos, FindNest_Scope);
  //Range_i64_Array ranges = get_enclosure_ranges(app, scratch, buffer, pos, FindNest_Scope|FindNest_Paren);
  //Range_i64_Array ranges = get_enclosure_ranges(app, scratch, buffer, pos, RangeHighlightKind_CharacterHighlight);
  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);

  region.x0 -= 3.f;
  Rect_f32 prev_clip = draw_set_clip(app, region);

  f32 wid = 2.f;
  f32 x_off = rect_width(text_layout_character_on_screen(app, text_layout_id, pos)) + 1.f;
  draw_scope_range(app, view, buffer, text_layout_id, ranges.ranges[0], x_off, wid, fcolor_id(defcolor_preproc));
  for(i32 i=1; i<ranges.count; i++){
    Range_i64 range = ranges.ranges[i];
    draw_scope_range(app, view, buffer, text_layout_id, range, x_off, wid, fcolor_id(defcolor_ghost_character));
  }
  draw_set_clip(app, prev_clip);

  i32 count = 0;
  Marker *markers = NULL;
  Buffer_ID comp_buffer = get_buffer_by_name(app, string_u8_litexpr("*compilation*"), Access_Always);
  b32 use_error_highlight = def_get_config_b32(vars_save_string_lit("use_error_highlight"));
  if (use_error_highlight && comp_buffer){
    Managed_Scope scopes[2];
    scopes[0] = buffer_get_managed_scope(app, comp_buffer);
    scopes[1] = buffer_get_managed_scope(app, buffer);
    Managed_Scope scope = get_managed_scope_with_multiple_dependencies(app, scopes, 2);
    Managed_Object *markers_object = scope_attachment(app, scope, sticky_jump_marker_handle, Managed_Object);

    if (markers_object){
      count = managed_object_get_item_count(app, *markers_object);
      markers = push_array(scratch, Marker, count);
      managed_object_load_data(app, *markers_object, 0, count, markers);
    }
  }


  /// Basically just fleury end brace annotations
  for(i32 i=ranges.count-1; i >= 0; --i){
    Range_i64 range = ranges.ranges[i];

    i64 start_line_num = get_line_number_from_pos(app, buffer, range.start);
    i64 end_line_num   = get_line_number_from_pos(app, buffer, range.end);
    if(start_line_num == end_line_num || range.end >= visible_range.end){ continue; }

    b32 has_compile_error = false;
    for(i32 j = 0; j < count; j += 1){
      i64 line_error = get_line_number_from_pos(app, buffer, markers[j].pos);
      if(line_error == end_line_num){
        has_compile_error = true;
        break;
      }
    }
    if(has_compile_error){ continue; }

    Token *start_token = 0;
    Token_Iterator_Array it = token_iterator_pos(0, &token_array, range.start-1);
    i32 token_count=0, paren_level=0;

    for(;;){
      Token *token = token_it_read(&it);
      if(token == 0){ break; }
      ++token_count;

      if(0){}
      else if(token->kind == TokenBaseKind_ParentheticalClose){ ++paren_level; }
      else if(token->kind == TokenBaseKind_ParentheticalOpen){  --paren_level; }

      if(paren_level == 0){
        if(token->kind == TokenBaseKind_ScopeClose ||
           (token->kind == TokenBaseKind_StatementClose && token->sub_kind != TokenCppKind_Colon))
        {
          break;
        }
        else if(token->kind == TokenBaseKind_Identifier ||
                token->kind == TokenBaseKind_Keyword ||
                token->kind == TokenBaseKind_Comment ||
                token->kind == byp_TokenKind_ControlFlow)
        {
          start_token = token;
          break;
        }
      }

      if(!token_it_dec_non_whitespace(&it)){ break; }
    }

    if(start_token){
      start_line_num = get_line_number_from_pos(app, buffer, start_token->pos);
      String_Const_u8 start_line_text = push_buffer_line(app, scratch, buffer, start_line_num);

      u64 whitespace_count = 0;
      foreach(j,start_line_text.size){
        if(start_line_text.str[j] > 32){ break; }
        ++whitespace_count;
      }
      start_line_text.str  += whitespace_count;
      start_line_text.size -= whitespace_count;
      start_line_text.size -= (start_line_text.str[start_line_text.size - 1] == 13);

      i64 last_char = get_line_end_pos(app, buffer, end_line_num)-1;
      Rect_f32 last_char_rect = text_layout_character_on_screen(app, text_layout_id, last_char);
      Vec2_f32 string_pos = V2f32(last_char_rect.x1, last_char_rect.y0);
      string_pos += V2f32(2, 4);

      draw_string(app, byp_small_italic_face, start_line_text, string_pos, fcolor_id(defcolor_ghost_character));
    }
  }
}

function void
byp_draw_comments(Application_Links *app, Buffer_ID buffer, Text_Layout_ID text_layout_id, Token_Array *array, Rect_f32 rect){
  Scratch_Block scratch(app);

  b32 use_comment_keyword = def_get_config_b32(vars_save_string_lit("use_comment_keyword"));
  if (use_comment_keyword){
    Comment_Highlight_Pair pairs[] = {
      {string_u8_litexpr("NOTE"),  finalize_color(defcolor_comment_pop, 0)},
      {string_u8_litexpr("TODO"),  finalize_color(defcolor_comment_pop, 1)},
      {string_u8_litexpr("DEBUG"), finalize_color(defcolor_comment_pop, 1)},
      {string_u8_litexpr("ISSUE"), finalize_color(defcolor_comment_pop, 1)},
      {string_u8_litexpr("FIX"),   finalize_color(defcolor_comment_pop, 1)},
    };
    draw_comment_highlights(app, buffer, text_layout_id, array, pairs, ArrayCount(pairs));
  }

  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);
  i64 first_index = token_index_from_pos(array, visible_range.first);
  Token_Iterator_Array it = token_iterator_index(buffer, array, first_index);
  for (;;){
    Temp_Memory_Block temp(scratch);
    Token *token = token_it_read(&it);
    if (token->pos >= visible_range.one_past_last){ break; }
    String_Const_u8 tail = {};
    if (token_it_check_and_get_lexeme(app, scratch, &it, TokenBaseKind_Comment, &tail)){

      // - divider comments
      if (byp_is_divider(tail)){
        f32 y = text_layout_character_on_screen(app, text_layout_id, token->pos).y0;
        Rect_f32 dividor_line = Rf32(rect.x0, y - 1.f, rect.x1, y);
        draw_rectangle_fcolor(app, dividor_line, 0.f, fcolor_id(defcolor_comment));
      }

      // paint @annotations in comments
      for (i64 i = 0; i < token->size; i += 1){
        if (tail.str[i] != '@'){ continue; }
        Range_i64 range = Ii64(i, i+1);
        for (i64 j = i+1; j < token->size; j += 1){
          if (!character_is_alpha_numeric(tail.str[j])){ break; }
          range.max++;
        }

        if (range_size(range) > 1){
          paint_text_color(app, text_layout_id, range + token->pos, 0xFFFF0000);
        }
      }
    }
    if (!token_it_inc_non_whitespace(&it)){ break; }
  }
}

function void
byp_draw_compile_errors(Application_Links *app, Buffer_ID buffer, Text_Layout_ID text_layout_id, Buffer_ID comp_buffer){
  Scratch_Block scratch(app);
  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);
  FColor cl_error = fcolor_blend(fcolor_id(defcolor_highlight_junk), 0.6f, fcolor_id(defcolor_text_default));

  Managed_Scope scopes[2];
  scopes[0] = buffer_get_managed_scope(app, comp_buffer);
  scopes[1] = buffer_get_managed_scope(app, buffer);
  Managed_Scope scope = get_managed_scope_with_multiple_dependencies(app, scopes, 2);
  Managed_Object *markers_object = scope_attachment(app, scope, sticky_jump_marker_handle, Managed_Object);

  i32 count = managed_object_get_item_count(app, *markers_object);
  Marker *markers = push_array(scratch, Marker, count);
  managed_object_load_data(app, *markers_object, 0, count, markers);

  for (i32 i = 0; i < count; i += 1){
    i64 line_number = get_line_number_from_pos(app, buffer, markers[i].pos);
    Range_i64 line_range = get_line_pos_range(app, buffer, line_number);
    if (!range_overlap(visible_range, line_range)){ continue; }

    i64 comp_line_number = markers[i].line;
    String_Const_u8 comp_line_string = push_buffer_line(app, scratch, comp_buffer, comp_line_number);
    Parsed_Jump jump = parse_jump_location(comp_line_string);
    if (!jump.success){ continue; }

    draw_line_highlight(app, text_layout_id, line_number, fcolor_id(defcolor_highlight_junk));
    i64 end_pos = get_line_end_pos(app, buffer, line_number)-1;
    Rect_f32 end_rect = text_layout_character_on_screen(app, text_layout_id, end_pos);
    Vec2_f32 p0 = V2f32(end_rect.x1 + 4.f, end_rect.y0 + 2.f);
    String_Const_u8 error_string = string_skip(comp_line_string, jump.colon_position + 2);

draw_string(app, byp_small_italic_face, error_string, p0, cl_error);
  }
}

function void
byp_render_buffer(Application_Links *app, View_ID view_id, Face_ID face_id, Buffer_ID buffer, Text_Layout_ID text_layout_id, Rect_f32 rect, Frame_Info frame_info = {}){
  ProfileScope(app, "render buffer");
  b32 is_active_view = view_id == get_active_view(app, Access_Always);
  Rect_f32 prev_clip = draw_set_clip(app, rect);

  Range_i64 visible_range = text_layout_get_visible_range(app, text_layout_id);

  Face_Metrics metrics = get_face_metrics(app, face_id);
  u64 cursor_roundness_100 = def_get_config_u64(app, vars_save_string_lit("cursor_roundness"));
  f32 cursor_roundness = metrics.normal_advance*cursor_roundness_100*0.01f;
  f32 mark_thickness = (f32)def_get_config_u64(app, vars_save_string_lit("mark_thickness"));

  i64 cursor_pos = view_correct_cursor(app, view_id);
  view_correct_mark(app, view_id);

  b32 use_scope_highlight = def_get_config_b32(vars_save_string_lit("use_scope_highlight"));
  if(use_scope_highlight){
    Color_Array colors = finalize_color_array(defcolor_back_cycle);
    draw_scope_highlight(app, buffer, text_layout_id, cursor_pos, colors.vals, colors.count);
  }

  b32 highlight_line_at_cursor = def_get_config_b32(vars_save_string_lit("highlight_line_at_cursor"));
  if(highlight_line_at_cursor && is_active_view){
    i64 line_number = get_line_number_from_pos(app, buffer, cursor_pos);
    draw_line_highlight(app, text_layout_id, line_number, fcolor_id(defcolor_highlight_cursor_line));
  }

  if(is_active_view && byp_col_cursor.pos > 0){
    byp_col_cursor = buffer_compute_cursor(app, buffer, seek_line_col(byp_col_cursor.line, byp_col_cursor.col));

    i64 rel_pos = cursor_pos;
    Rect_f32 rel_rect = text_layout_character_on_screen(app, text_layout_id, rel_pos);

    i64 line = get_line_number_from_pos(app, buffer, rel_pos);
    Vec2_f32 col_rel = view_relative_xy_of_pos(app, view_id, line, byp_col_cursor.pos);
    Vec2_f32 rel_point = view_relative_xy_of_pos(app, view_id, line, rel_pos);
    Rect_f32 col_highlight_rect = {};
    col_highlight_rect.p0 = (rel_rect.p0 - rel_point) + col_rel;
    col_highlight_rect.p1 = (rel_rect.p1 - rel_point) + col_rel;
    col_highlight_rect.y0 = rect.y0;
    col_highlight_rect.y1 = rect.y1;

    draw_rectangle_fcolor(app, col_highlight_rect, 0.f, fcolor_id(defcolor_highlight_cursor_line));
  }

  Token_Array token_array = get_token_array_from_buffer(app, buffer);
  if(token_array.tokens == 0){
    paint_text_color_fcolor(app, text_layout_id, visible_range, fcolor_id(defcolor_text_default));
  }else{
    byp_draw_token_colors(app, view_id, buffer, text_layout_id);
    byp_draw_comments(app, buffer, text_layout_id, &token_array, rect);
  }

  b32 use_error_highlight = def_get_config_b32(vars_save_string_lit("use_error_highlight"));
  b32 use_jump_highlight  = def_get_config_b32(vars_save_string_lit("use_jump_highlight"));
  if(use_error_highlight || use_jump_highlight){
    Buffer_ID comp_buffer = get_buffer_by_name(app, string_u8_litexpr("*compilation*"), Access_Always);
    if(use_error_highlight && comp_buffer){
      byp_draw_compile_errors(app, buffer, text_layout_id, comp_buffer);
    }

    if(use_jump_highlight){
      Buffer_ID jump_buffer = get_locked_jump_buffer(app);
      if(jump_buffer != comp_buffer){
        draw_jump_highlights(app, buffer, text_layout_id, jump_buffer, fcolor_id(defcolor_highlight_white));
      }
    }
  }

  b32 use_paren_helper = def_get_config_b32(vars_save_string_lit("use_paren_helper"));
  if(use_paren_helper){
    Color_Array colors = finalize_color_array(defcolor_text_cycle);
    draw_paren_highlight(app, buffer, text_layout_id, cursor_pos, colors.vals, colors.count);
  }

  byp_draw_scope_brackets(app, view_id, buffer, text_layout_id, rect, cursor_pos);

  b64 show_whitespace = false;
  view_get_setting(app, view_id, ViewSetting_ShowWhitespace, &show_whitespace);
  if(show_whitespace){
    if(token_array.tokens == 0){
      draw_whitespace_highlight(app, buffer, text_layout_id, cursor_roundness);
    }else{
      draw_whitespace_highlight(app, text_layout_id, &token_array, cursor_roundness);
    }
  }

  if(byp_show_hex_colors){
    byp_hex_color_preview(app, buffer, text_layout_id);
  }

  if(is_active_view && vim_state.mode == VIM_Visual){
    vim_draw_visual_mode(app, view_id, buffer, face_id, text_layout_id);
  }

  fold_draw(app, buffer, text_layout_id);

  vim_draw_search_highlight(app, view_id, buffer, text_layout_id, cursor_roundness);

  switch(fcoder_mode){
    case FCoderMode_Original:
    vim_draw_cursor(app, view_id, is_active_view, buffer, text_layout_id, cursor_roundness, mark_thickness, frame_info); break;
    case FCoderMode_NotepadLike:
    draw_notepad_style_cursor_highlight(app, view_id, buffer, text_layout_id, cursor_roundness); break;
  }

  paint_fade_ranges(app, text_layout_id, buffer);
  draw_text_layout_default(app, text_layout_id);

  vim_draw_after_text(app, view_id, is_active_view, buffer, text_layout_id, cursor_roundness, mark_thickness, frame_info);
  if(is_active_view){
     byp_draw_function_preview(app, buffer, If32(rect.x0, rect.x1), cursor_pos);
     byp_draw_pos_context(app, view_id, buffer, text_layout_id, cursor_pos);
  }

  draw_set_clip(app, prev_clip);
}