void ToggleFullscreen() {
    if (IsInFullscreen) {
        SDL_SetWindowSize(SDLWindow, FullScreenSizeX, FullScreenSizeY);
        SDL_SetWindowPosition(SDLWindow, FullScreenPositionX, FullScreenPositionY);
    } else {
        SDL_GetWindowSize(SDLWindow, &FullScreenSizeX, &FullScreenSizeY);
        SDL_GetWindowPosition(SDLWindow, &FullScreenPositionX, &FullScreenPositionY);

        SDL_DisplayID          display = SDL_GetDisplayForWindow(SDLWindow);
        const SDL_DisplayMode *dm      = SDL_GetCurrentDisplayMode(display);
        SDL_SetWindowSize(SDLWindow, dm->w, dm->h);
        SDL_SetWindowPosition(SDLWindow, 0, 0);
    }

    IsInFullscreen = !IsInFullscreen;
}

void CheckpointBeforeGoto(Window *window, View *view) {
    Buffer *buffer = GetBuffer(view->active_buffer);
    Add(&window->goto_history, {buffer->id, view->carets[0]});
    window->goto_redo.len = 0;
}

void CheckpointBeforeGoto(Window *window) {
    CheckpointBeforeGoto(window, GetView(window->active_view));
}

GotoCrumb GetCrumb(Array<GotoCrumb> *cr) {
    for (; cr->len;) {
        GotoCrumb c      = Pop(cr);
        Buffer   *buffer = GetBufferStrict(c.buffer_id);
        if (buffer) return c;
    }
    return {};
}

void GotoBackward(Window *window) {
    BSet set = GetBSet(window);
    if (window->goto_history.len <= 0) return;
    Add(&window->goto_redo, {set.buffer->id, set.view->carets[0]});

    GotoCrumb c      = GetCrumb(&window->goto_history);
    Buffer   *buffer = GetBuffer(c.buffer_id);
    View     *view   = WindowOpenBufferView(window, buffer->name);
    view->carets[0]  = c.caret;
    UpdateScroll(window, true);
}

void GotoForward(Window *window) {
    BSet set = GetBSet(window);
    if (window->goto_redo.len <= 0) return;
    Add(&window->goto_history, {set.buffer->id, set.view->carets[0]});

    GotoCrumb c      = GetCrumb(&window->goto_redo);
    Buffer   *buffer = GetBuffer(c.buffer_id);
    View     *view   = WindowOpenBufferView(window, buffer->name);
    view->carets[0]  = c.caret;
    UpdateScroll(window, true);
}

Int ScreenSpaceToBufferPos(Window *window, View *view, Buffer *buffer, Vec2I mouse) {
    Vec2I mworld = mouse - window->document_rect.min + view->scroll;
    double px = (double)mworld.x / (double)FontCharSpacing;
    double py = (double)mworld.y / (double)FontLineSpacing;
    XY    xy     = {(Int)round(px), (Int)floor(py)};
    Int   result = XYToPosWithoutNL(buffer, xy);
    return result;
}

Int ScreenSpaceToBufferPosErrorOutOfBounds(Window *window, View *view, Buffer *buffer, Vec2I mouse) {
    Vec2I mworld = mouse - window->document_rect.min + view->scroll;
    double px = (double)mworld.x / (double)FontCharSpacing;
    double py = (double)mworld.y / (double)FontLineSpacing;
    XY    xy     = {(Int)round(px), (Int)floor(py)};
    Int   result = XYToPosErrorOutOfBounds(buffer, xy);
    return result;
}

void MouseLoadWord(Event event, void (*cmd_function)(String16 string)) {
    Vec2I mouse  = MouseVec2I();
    BSet  active = GetActiveSet();

    bool mouse_in_document = CheckCollisionPointRec(mouse, active.window->document_rect);
    if (mouse_in_document) {
        Int p = ScreenSpaceToBufferPosErrorOutOfBounds(active.window, active.view, active.buffer, mouse);
        if (p != -1) {
            Range enclose = EncloseLoadWord(active.buffer, p);
            if (InBounds(active.view->carets[0].range, p)) enclose = active.view->carets[0].range;
            String16 string = GetString(active.buffer, enclose);

            active.view->carets.len = 1;
            active.view->carets[0]  = MakeCaret(p);
            cmd_function(string);
        }
    }
}

void Command_ReplaceWithoutMovingCarets(View *view, Range range, String16 string) {
    Buffer      *buffer     = GetBuffer(view->active_buffer);
    Array<Caret> caret_copy = Copy(GetSystemAllocator(), view->carets);
    defer {
        Dealloc(&view->carets);
        view->carets = caret_copy;
    };

    Scratch scratch;
    Command_SelectRangeOneCursor(view, range);
    Array<Edit> edits = Command_ReplaceEx(scratch, view, string);
    AdjustCarets(edits, &caret_copy);
}

// @todo: revamp interface since it scrolls ALL VIEWS??? or maybe not??
void Command_Append(View *view, String16 string, bool scroll_to_end_if_cursor_on_last_line) {
    Scratch scratch;
    Buffer *buffer = GetBuffer(view->active_buffer);

    struct ViewInfo {
        View *view;
        Array<Caret> carets;
        bool scroll_to_end;
    };

    Array<ViewInfo> view_info = {scratch};
    for (View *it_view = FirstView; it_view; it_view = it_view->next) {
        if (it_view->active_buffer != buffer->id) {
            continue;
        }

        ViewInfo vi = {it_view};
        if (scroll_to_end_if_cursor_on_last_line) {
            Int line = PosToLine(buffer, GetFront(it_view->carets[0]));
            if (line == buffer->line_starts.len - 1) {
                vi.scroll_to_end = true;
            }
        }

        if (!vi.scroll_to_end) {
            vi.carets = Copy(GetSystemAllocator(), it_view->carets);
        }

        Add(&view_info, vi);
    }

    Command_SelectRangeOneCursor(view, GetEndAsRange(buffer));
    Command_Replace(view, string);

    For (view_info) {
        if (it.scroll_to_end) {
            it.view->carets[0] = MakeCaret(GetEndAsRange(buffer).min);
        } else {
            Dealloc(&it.view->carets);
            it.view->carets = it.carets;
        }
    }
}

void Command_Append(View *view, String string, bool scroll_to_end_if_cursor_on_last_line) {
    Scratch  scratch;
    String16 string16 = ToString16(scratch, string);
    Command_Append(view, string16, scroll_to_end_if_cursor_on_last_line);
}

void Command_Appendf(View *view, const char *fmt, ...) {
    Scratch scratch;
    STRING_FORMAT(scratch, fmt, string);
    Command_Append(view, string, true);
}

void ReportErrorf(const char *fmt, ...) {
    Scratch scratch;
    STRING_FORMAT(scratch, fmt, string);
    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error!", string.data, NULL);
    View *view = GetView(NullViewID);
    Command_Appendf(view, "%.*s\n", FmtString(string));
    ActiveWindow = NullWindowID;
}

void ReportConsolef(const char *fmt, ...) {
    Scratch scratch;
    STRING_FORMAT(scratch, fmt, string);
    View *view = GetView(NullViewID);
    Command_Appendf(view, "%.*s\n", FmtString(string));
}

void ReportWarningf(const char *fmt, ...) {
    Scratch scratch;
    STRING_FORMAT(scratch, fmt, string);
    View *null_view = GetView(NullViewID);
    Command_Appendf(null_view, "%.*s\n", FmtString(string));
    ActiveWindow = NullWindowID;
}

void Command_MoveCursorsByPageSize(Window *window, int direction, bool shift = false) {
    Assert(direction == DIR_UP || direction == DIR_DOWN);
    BSet set = GetBSet(window);
    CheckpointBeforeGoto(window);


    Rect2I visible_cells_rect = GetVisibleCells(window);
    Int    y                  = GetSize(visible_cells_rect).y - 2;
    if (direction == DIR_UP) y = -y;

    For(set.view->carets) {
        XY xy = PosToXY(set.buffer, GetFront(it));
        if (direction == DIR_DOWN && xy.line == set.buffer->line_starts.len - 1) {
            Range line_range = GetLineRange(set.buffer, xy.line);
            xy.col           = line_range.max - line_range.min;
        } else if (direction == DIR_UP && xy.line == 0) {
            xy.col = 0;
        }
        xy.line += y;

        Int pos = XYToPos(set.buffer, xy);
        if (shift) {
            it = SetFront(it, pos);
        } else {
            it = MakeCaret(pos);
        }
    }
}

void Command_MoveCursorsToSide(View *view, int direction, bool shift = false) {
    Assert(direction == DIR_LEFT || direction == DIR_RIGHT);
    Buffer *buffer = GetBuffer(view->active_buffer);

    For(view->carets) {
        Int pos = GetFront(it);
        if (direction == DIR_RIGHT) {
            pos = GetLineEnd(buffer, pos);
        } else {
            Int indent  = GetIndentAtPos(buffer, pos);
            Int new_pos = GetLineStart(buffer, pos);
            if (new_pos + indent != pos) {
                pos = new_pos + indent;
            } else {
                pos = new_pos;
            }
        }

        if (shift) {
            it = SetFront(it, pos);
        } else {
            it.range.max = it.range.min = pos;
        }
    }
}

Caret MoveCaret(Buffer *buffer, Caret it, int direction, bool ctrl = false, bool shift = false) {
    Int front      = GetFront(it);
    Int range_size = GetSize(it.range);
    switch (direction) {
    case DIR_UP: {
        if (ctrl && shift) {
            Int pos = GetPrevEmptyLineStart(buffer, front);
            it      = SetFront(it, pos);
        } else if (ctrl) {
            Int pos = GetPrevEmptyLineStart(buffer, it.range.min);
            it      = MakeCaret(pos);
        } else if (shift) {
            Int pos = OffsetByLine(buffer, front, -1);
            it      = SetFront(it, pos);
        } else {
            if (range_size == 0) {
                Int pos = OffsetByLine(buffer, it.range.min, -1);
                it      = MakeCaret(pos);
            } else {
                it = MakeCaret(it.range.min);
            }
        }
    } break;
    case DIR_DOWN: {
        if (ctrl && shift) {
            Int pos = GetNextEmptyLineStart(buffer, front);
            it      = SetFront(it, pos);
        } else if (ctrl) {
            Int pos = GetNextEmptyLineStart(buffer, it.range.max);
            it      = MakeCaret(pos);
        } else if (shift) {
            Int pos = OffsetByLine(buffer, front, 1);
            it      = SetFront(it, pos);
        } else {
            if (range_size == 0) {
                Int pos = OffsetByLine(buffer, it.range.max, 1);
                it      = MakeCaret(pos);
            } else {
                it = MakeCaret(it.range.max);
            }
        }
    } break;
    case DIR_LEFT: {
        if (ctrl && shift) {
            Int pos = GetPrevWordStart(buffer, front);
            it      = SetFront(it, pos);
        } else if (ctrl) {
            if (range_size != 0 && front != it.range.min) {
                it = MakeCaret(it.range.min);
            } else {
                Int pos = GetPrevWordStart(buffer, it.range.min);
                it      = MakeCaret(pos);
            }
        } else if (shift) {
            Int pos = GetPrevChar(buffer, front);
            it      = SetFront(it, pos);
        } else {
            if (range_size == 0) {
                Int pos = GetPrevChar(buffer, it.range.min);
                it      = MakeCaret(pos);
            } else {
                it = MakeCaret(it.range.min);
            }
        }
    } break;
    case DIR_RIGHT: {
        if (ctrl && shift) {
            Int pos = GetNextWordEnd(buffer, front);
            it      = SetFront(it, pos);
        } else if (ctrl) {
            if (range_size != 0 && front != it.range.max) {
                it = MakeCaret(it.range.max);
            } else {
                Int pos = GetNextWordEnd(buffer, it.range.max);
                it      = MakeCaret(pos);
            }
        } else if (shift) {
            Int pos = GetNextChar(buffer, front);
            it      = SetFront(it, pos);
        } else {
            if (range_size == 0) {
                Int pos = GetNextChar(buffer, it.range.max);
                it      = MakeCaret(pos);
            } else {
                it = MakeCaret(it.range.max);
            }
        }
    } break;
    }
    return it;
}

void Command_Move(View *view, int direction, bool ctrl = false, bool shift = false) {
    Assert(direction < DIR_COUNT);
    Buffer *buffer = GetBuffer(view->active_buffer);
    For(view->carets) {
        it = MoveCaret(buffer, it, direction, ctrl, shift);
    }
}

void Command_MoveLine(View *view, int direction) {
    Assert(direction == DIR_DOWN || direction == DIR_UP);
    Scratch scratch;

    // @todo: this doesn't work well at the end of buffer
    struct XYPair {
        XY front;
        XY back;
    };

    Buffer     *buffer = GetBuffer(view->active_buffer);
    Array<Edit> edits  = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);
    Array<XYPair> saved_xy = {scratch};
    For(view->carets) {
        Int eof_current = 0;
        Range lines_to_move_range = {GetFullLineStart(buffer, it.range.min), GetFullLineEnd(buffer, it.range.max, &eof_current)};
        if (lines_to_move_range.min == 0 && direction == DIR_UP) {
            continue;
        }

        Int eof = 0;
        Int next_line_start = lines_to_move_range.max;
        Int next_line_end   = GetFullLineEnd(buffer, next_line_start, &eof);
        Int prev_line_end   = lines_to_move_range.min - 1;
        Int prev_line_start = GetFullLineStart(buffer, prev_line_end);

        if (direction == DIR_DOWN && eof) {
            continue;
        } else if (direction == DIR_UP && eof_current) {
            continue;
        }

        String16 string = Copy(scratch, GetString(buffer, lines_to_move_range));

        AddEdit(&edits, lines_to_move_range, {});
        if (direction == DIR_DOWN) {
            AddEdit(&edits, Rng(next_line_end), string);
        } else {
            AddEdit(&edits, Rng(prev_line_start), string);
        }

        Add(&saved_xy, {PosToXY(buffer, GetFront(it)), PosToXY(buffer, GetBack(it))});
    }
    EndEdit(buffer, &edits, &view->carets, !KILL_SELECTION);

    Int line_offset = direction == DIR_UP ? -1 : +1;
    for (Int i = 0; i < saved_xy.len; i += 1) {
        Caret  &caret  = view->carets[i];
        XYPair &xypair = saved_xy[i];
        xypair.front.line += line_offset;
        xypair.back.line += line_offset;
        Int front = XYToPos(buffer, xypair.front);
        Int back  = XYToPos(buffer, xypair.back);

        caret = MakeCaret(front, back);
    }
}

Array<Edit> Command_ReplaceEx(Allocator scratch, View *view, String16 string) {
    Buffer     *buffer = GetBuffer(view->active_buffer);
    Array<Edit> edits  = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);
    For(view->carets) AddEdit(&edits, it.range, string);
    EndEdit(buffer, &edits, &view->carets, KILL_SELECTION);
    return edits;
}

void Command_Replace(View *view, String16 string) {
    Scratch scratch;
    Command_ReplaceEx(scratch, view, string);
}

void Command_DuplicateLine(View *view, int direction) {
    Assert(direction == DIR_UP || direction == DIR_DOWN);
    Scratch scratch;

    Buffer *buffer = GetBuffer(view->active_buffer);
    BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);

    Array<Edit> edits = {scratch};
    For(view->carets) {
        Int eof = 0;
        Range range = {};
        range.max = GetFullLineEnd(buffer, it.range.max, &eof);
        range.min = GetFullLineStart(buffer, it.range.min);
        range.min -= Clamp(eof, (Int)0, buffer->len);
        String16 string = Copy(scratch, GetString(buffer, range));

        Int pos = direction == DIR_UP ? range.min : range.max;
        AddEdit(&edits, Rng(pos), string);
    }
    EndEdit(buffer, &edits, &view->carets, !KILL_SELECTION);

    Int coef = direction == DIR_UP ? -1 : 1;
    for (Int i = 0; i < edits.len; i += 1) {
        Edit *edit = edits.data + i;
        Caret *caret = view->carets.data + i;

        XY xymin = PosToXY(buffer, caret->range.min);
        XY xymax = PosToXY(buffer, caret->range.max);
        Int line_count = xymax.line - xymin.line + 1;

        xymin.line += coef * line_count;
        xymax.line += coef * line_count;

        caret->range.min = XYToPos(buffer, xymin);
        caret->range.max = XYToPos(buffer, xymax);
    }
}

Array<Range> GetSelectedLinesSorted(Allocator allocator, View *view) {
    Scratch      scratch(allocator);
    Buffer      *buffer     = GetBuffer(view->active_buffer);
    Array<Caret> caret_copy = TightCopy(scratch, view->carets);
    Array<Caret> temp       = TightCopy(scratch, view->carets);
    if (view->carets.len > 1) MergeSort(view->carets.len, caret_copy.data, temp.data);

    Array<Range> result = {allocator};
    For(caret_copy) {
        Int   min_line   = PosToLine(buffer, it.range.min);
        Int   max_line   = PosToLine(buffer, it.range.max);
        Range line_range = {min_line, max_line + 1};

        if (result.len == 0) {
            Add(&result, line_range);
            continue;
        }

        Range *last = GetLast(result);
        if (AreOverlapping(*last, line_range)) {
            last->max = Max(last->max, line_range.max);
        } else {
            Add(&result, line_range);
        }
    }
    return result;
}

void Command_IndentSelectedLines(View *view, bool shift = false) {
    Scratch scratch;
    Buffer *buffer = GetBuffer(view->active_buffer);

    Array<Edit> edits = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);

    Array<Range> line_ranges_to_indent = GetSelectedLinesSorted(scratch, view);
    For(line_ranges_to_indent) {
        for (Int i = it.min; i < it.max; i += 1) {
            Range pos_range_of_line = GetLineRange(buffer, i);

            if (!shift) {
                String16 whitespace_string = {u"                                      ", StyleIndentSize};
                AddEdit(&edits, {pos_range_of_line.min, pos_range_of_line.min}, whitespace_string);
            } else {
                String16 string         = GetString(buffer, pos_range_of_line);
                Int      whitespace_len = 0;
                for (Int i = 0; i < StyleIndentSize && i < string.len && string.data[i] == ' '; i += 1) {
                    whitespace_len += 1;
                }

                AddEdit(&edits, {pos_range_of_line.min, pos_range_of_line.min + whitespace_len}, u"");
            }
        }
    }
    EndEdit(buffer, &edits, &view->carets, !KILL_SELECTION);
    view->update_scroll = false;
}

void Command_TrimTrailingWhitespace(View *view, bool dont_trim_lines_with_cursor) {
    Scratch scratch;
    Buffer *buffer = GetBuffer(view->active_buffer);

    Array<Edit> edits = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);

    Array<Range> lines_to_skip_triming = {};
    if (dont_trim_lines_with_cursor) lines_to_skip_triming = GetSelectedLinesSorted(scratch, view);

    for (Int i = 0; i < buffer->line_starts.len; i += 1) {
        Int range_index = FindRangeByPos(&lines_to_skip_triming, i);
        if (range_index != -1) continue;

        Range range          = GetLineRangeWithoutNL(buffer, i);
        Int   whitespace_end = range.max;
        for (; whitespace_end > range.min; whitespace_end -= 1) {
            U16  w             = buffer->data[whitespace_end - 1];
            bool is_whitespace = w == ' ' || w == '\t' || w == '\v' || w == '\r';
            if (!is_whitespace) break;
        }

        Range whitespace_range = {whitespace_end, range.max};
        AddEdit(&edits, whitespace_range, u"");
    }

    EndEdit(buffer, &edits, &view->carets, !KILL_SELECTION);
    view->update_scroll = false;
}

void Command_ConvertLineEndings(View *view, bool dont_trim_lines_with_cursor) {
    Scratch scratch;
    Buffer *buffer = GetBuffer(view->active_buffer);

    Array<Edit> edits = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);

    Array<Range> lines_to_skip_triming = {};
    if (dont_trim_lines_with_cursor) lines_to_skip_triming = GetSelectedLinesSorted(scratch, view);

    for (Int i = 0; i < buffer->line_starts.len; i += 1) {
        Int range_index = FindRangeByPos(&lines_to_skip_triming, i);
        if (range_index != -1) continue;

        Range   range = GetLineRangeWithoutNL(buffer, i);
        char16_t cr   = GetChar(buffer, range.max - 1);
        char16_t lf   = GetChar(buffer, range.max);
        if (cr == u'\r' && lf == u'\n') {
            AddEdit(&edits, {range.max - 1, range.max}, u"");
        }
    }
    EndEdit(buffer, &edits, &view->carets, !KILL_SELECTION);
    view->update_scroll = false;
}

bool IsCFile(String name) {
    bool result = EndsWith(name, ".cpp") || EndsWith(name, ".c") || EndsWith(name, ".hpp") || EndsWith(name, ".h");
    return result;
}

void SaveBuffer(View *view) {
    Buffer *buffer                      = GetBuffer(view->active_buffer);
    bool    dont_trim_lines_with_cursor = true;
    Command_ConvertLineEndings(view, dont_trim_lines_with_cursor);
    if (StyleTrimWhitespaceOnSave) {
        Command_TrimTrailingWhitespace(view, dont_trim_lines_with_cursor);
        Assert(view->active_buffer == buffer->id);
    }

    if (StyleClangFormatOnSave && IsCFile(buffer->name)) {
        Scratch scratch;
        String  string      = AllocCharString(scratch, buffer);
        Buffer *temp_buffer = ExecAndWait(scratch, "clang-format", GetDir(buffer), string);
        Command_ReplaceWithoutMovingCarets(view, GetRange(buffer), {temp_buffer->str, temp_buffer->len});
    }

    Scratch scratch;
    String  string  = AllocCharString(scratch, buffer);
    bool    success = WriteFile(buffer->name, string);

    if (success) {
        buffer->file_mod_time = GetFileModTime(buffer->name);
        buffer->dirty         = false;
        buffer->gc            = false;
    } else {
        ReportWarningf("Failed to save file with name: %.*s", FmtString(buffer->name));
    }
}

void Command_KillSelectedLines(View *view) {
    Scratch scratch;
    Buffer *buffer = GetBuffer(view->active_buffer);
    SaveCaretHistoryBeforeBeginEdit(buffer, view->carets);

    For (view->carets) {
        Int eof = 0;
        it.range.max = GetFullLineEnd(buffer, it.range.max, &eof);
        it.range.min = GetFullLineStart(buffer, it.range.min);
        it.range.min -= Clamp(eof, (Int)0, buffer->len);
    }
    Command_Replace(view, u"");
}

void Command_Delete(View *view, int direction, bool ctrl = false) {
    Assert(direction == DIR_LEFT || direction == DIR_RIGHT);
    Scratch scratch;

    Buffer     *buffer = GetBuffer(view->active_buffer);
    Array<Edit> edits  = BeginEdit(scratch, buffer, view->carets);

    // Select things to delete
    For(view->carets) {
        if (GetSize(it.range)) continue;
        if (direction == DIR_LEFT) {

            // Delete indent in multiple of IndentSize
            Range indent_range = GetIndentRangeAtPos(buffer, it.range.min);
            if (ctrl == false && it.range.min > indent_range.min && it.range.max <= indent_range.max) {
                Int offset    = it.range.min - indent_range.min;
                Int to_delete = (offset % (StyleIndentSize));
                if (to_delete == 0) to_delete = StyleIndentSize;
                to_delete = Clamp(to_delete, (Int)1, StyleIndentSize);
                for (Int i = 0; i < to_delete; i += 1) {
                    it = MoveCaret(buffer, it, direction, false, SHIFT_PRESSED);
                }

            } else {
                it = MoveCaret(buffer, it, direction, ctrl, SHIFT_PRESSED);
            }
        } else {
            it = MoveCaret(buffer, it, direction, ctrl, SHIFT_PRESSED);
        }
    }

    MergeCarets(buffer, &view->carets);
    For(view->carets) AddEdit(&edits, it.range, {});
    EndEdit(buffer, &edits, &view->carets, true);
}

void Command_SelectAll(View *view, String16 needle) {
    Buffer  *buffer        = GetBuffer(view->active_buffer);
    String16 string_buffer = GetString(buffer);

    for (Int pos = 0;;) {
        Int      index  = 0;
        String16 medium = Skip(string_buffer, pos);
        if (!Seek(medium, needle, &index)) {
            break;
        }

        Add(&view->carets, MakeCaret(pos + index + needle.len, pos + index));
        pos += needle.len;
    }
    MergeCarets(buffer, &view->carets);
}

void Command_CreateCursorVertical(View *view, int direction) {
    Assert(direction == DIR_UP || direction == DIR_DOWN);
    Buffer *buffer = GetBuffer(view->active_buffer);

    Int line_offset = direction == DIR_UP ? -1 : 1;

    Scratch      scratch;
    Array<Caret> arr = {scratch};
    For(view->carets) {
        if (PosToLine(buffer, it.range.min) == PosToLine(buffer, it.range.max)) {
            Int f = OffsetByLine(buffer, GetFront(it), line_offset);
            Int b = OffsetByLine(buffer, GetBack(it), line_offset);
            Add(&arr, MakeCaret(f, b));
        } else {
            Int   pos   = direction == DIR_UP ? it.range.min : it.range.max;
            Caret caret = MakeCaret(pos);
            caret       = MoveCaret(buffer, caret, direction);
            Add(&arr, caret);
        }
    }
    For(arr) Add(&view->carets, it);
    MergeCarets(buffer, &view->carets);
}

void Command_SelectRangeOneCursor(View *view, Caret caret) {
    view->carets.len = 1;
    view->carets[0]  = caret;
}

void Command_SelectRangeOneCursor(View *view, Range range) {
    Command_SelectRangeOneCursor(view, MakeCaret(range.min, range.max));
}

void Command_SelectEntireBuffer(View *view) {
    Buffer *buffer = GetBuffer(view->active_buffer);
    Command_SelectRangeOneCursor(view, GetRange(buffer));
}

Caret FindPrev(Buffer *buffer, String16 needle, Caret caret) {
    Int      pos    = GetFront(caret);
    String16 medium = GetString(buffer, {0, pos});

    Caret result = caret;
    Int   index  = 0;
    if (Seek(medium, needle, &index, SeekFlag_MatchFindLast)) {
        result = MakeCaret(index, index + needle.len);
    } else {
        medium = GetString(buffer);
        if (Seek(medium, needle, &index, SeekFlag_MatchFindLast)) {
            result = MakeCaret(index, index + needle.len);
        }
    }

    return result;
}

Caret FindNext(Buffer *buffer, String16 needle, Caret caret) {
    Int      pos    = GetFront(caret);
    String16 medium = GetString(buffer, {pos, INT64_MAX});

    Caret result = caret;
    Int   index  = 0;
    if (Seek(medium, needle, &index)) {
        result = MakeCaret(pos + index + needle.len, pos + index);
    } else {
        medium = GetString(buffer);
        if (Seek(medium, needle, &index)) {
            result = MakeCaret(index + needle.len, index);
        }
    }

    return result;
}

void Command_IdentedNewLine(View *view) {
    Buffer     *buffer = GetBuffer(view->active_buffer);
    Scratch     scratch;
    Array<Edit> edits = BeginEdit(scratch, buffer, view->carets);
    MergeCarets(buffer, &view->carets);
    For(view->carets) {
        Int      front    = GetFront(it);
        Int      line     = PosToLine(buffer, front);
        Int      indent   = GetLineIndent(buffer, line);
        String   string   = Format(scratch, "\n%.*s", (int)indent, "                                                       ");
        String16 string16 = ToString16(scratch, string);
        AddEdit(&edits, it.range, string16);
    }
    EndEdit(buffer, &edits, &view->carets, KILL_SELECTION);
}

void Command_Find(View *seek_view, String16 needle, bool forward = true) {
    Buffer *seek_buffer = GetBuffer(seek_view->active_buffer);
    Caret   caret       = seek_view->carets[0];
    if (forward) caret = FindNext(seek_buffer, needle, caret);
    if (!forward) caret = FindPrev(seek_buffer, needle, caret);
    Command_SelectRangeOneCursor(seek_view, caret);

    IF_DEBUG(AssertRanges(seek_view->carets));
}

void Command_GotoNextInList(Window *window, Int line_offset = 1) {
    Assert(line_offset == 1 || line_offset == -1);
    View *active_view = GetView(window->active_view);

    View *view_goto     = GetView(window->active_goto_list);
    window->active_view = view_goto->id;

    Buffer *buffer_goto = GetBuffer(view_goto->active_buffer);
    int64_t pos         = GetFront(view_goto->carets[0]);
    Int     line        = PosToLine(buffer_goto, pos);

    bool opened = false;
    for (Int i = line + line_offset; i >= 0 && i < buffer_goto->line_starts.len; i += line_offset) {
        Range    line_range  = GetLineRangeWithoutNL(buffer_goto, line + line_offset);
        String16 line        = GetString(buffer_goto, line_range);
        view_goto->carets[0] = MakeCaret(line_range.min);
        line                 = Trim(line);

        MergeCarets(buffer_goto, &view_goto->carets);
        IF_DEBUG(AssertRanges(view_goto->carets));
        if (line.len == 0) continue;

        CheckpointBeforeGoto(window, active_view);
        Command_Open(line);
        opened = true;
        break;
    }

    if (!opened) window->active_view = active_view->id;
}

void Command_FuzzySort(View *view, String16 needle) {
    Buffer *buffer = GetBuffer(view->active_buffer);

    Scratch          scratch;
    Array<FuzzyPair> ratings = FuzzySearchLines(scratch, buffer, 0, buffer->line_starts.len, needle);

    Buffer *temp_buffer = CreateTempBuffer(scratch, buffer->cap);
    For(ratings) {
        String16 s = GetLineStringWithoutNL(buffer, it.index);
        if (s.len == 0) continue;
        RawReplaceText(temp_buffer, GetEndAsRange(temp_buffer), s);
        RawReplaceText(temp_buffer, GetEndAsRange(temp_buffer), u"\n");
    }

    Command_SelectEntireBuffer(view);
    Command_Replace(view, GetString(temp_buffer));
    Command_SelectRangeOneCursor(view, Rng(0));
}