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// use editor::{Cursor, HighlightedRange, HighlightedRangeLine};
// use gpui::{
// point, transparent_black, AnyElement, AppContext, Bounds, Component, CursorStyle, Element,
// FontStyle, FontWeight, HighlightStyle, Hsla, LayoutId, Line, ModelContext, MouseButton,
// Overlay, Pixels, Point, Quad, TextStyle, Underline, ViewContext, WeakModel, WindowContext,
// };
// use itertools::Itertools;
// use language::CursorShape;
// use ordered_float::OrderedFloat;
// use settings::Settings;
// use terminal::{
// alacritty_terminal::{
// ansi::{Color as AnsiColor, Color::Named, CursorShape as AlacCursorShape, NamedColor},
// grid::Dimensions,
// index::Point as AlacPoint,
// term::{cell::Flags, TermMode},
// },
// // mappings::colors::convert_color,
// terminal_settings::TerminalSettings,
// IndexedCell,
// Terminal,
// TerminalContent,
// TerminalSize,
// };
// use theme::ThemeSettings;
// use workspace::ElementId;
// use std::mem;
// use std::{fmt::Debug, ops::RangeInclusive};
// use crate::TerminalView;
// ///The information generated during layout that is necessary for painting
// pub struct LayoutState {
// cells: Vec<LayoutCell>,
// rects: Vec<LayoutRect>,
// relative_highlighted_ranges: Vec<(RangeInclusive<AlacPoint>, Hsla)>,
// cursor: Option<Cursor>,
// background_color: Hsla,
// size: TerminalSize,
// mode: TermMode,
// display_offset: usize,
// hyperlink_tooltip: Option<AnyElement<TerminalView>>,
// gutter: f32,
// }
// ///Helper struct for converting data between alacritty's cursor points, and displayed cursor points
// struct DisplayCursor {
// line: i32,
// col: usize,
// }
// impl DisplayCursor {
// fn from(cursor_point: AlacPoint, display_offset: usize) -> Self {
// Self {
// line: cursor_point.line.0 + display_offset as i32,
// col: cursor_point.column.0,
// }
// }
// pub fn line(&self) -> i32 {
// self.line
// }
// pub fn col(&self) -> usize {
// self.col
// }
// }
// #[derive(Clone, Debug, Default)]
// struct LayoutCell {
// point: AlacPoint<i32, i32>,
// text: Line,
// }
// impl LayoutCell {
// fn new(point: AlacPoint<i32, i32>, text: Line) -> LayoutCell {
// LayoutCell { point, text }
// }
// fn paint(
// &self,
// origin: Point<Pixels>,
// layout: &LayoutState,
// _visible_bounds: Bounds<Pixels>,
// _view: &mut TerminalView,
// cx: &mut WindowContext,
// ) {
// let pos = {
// let point = self.point;
// Point::new(
// (origin.x + point.column as f32 * layout.size.cell_width).floor(),
// origin.y + point.line as f32 * layout.size.line_height,
// )
// };
// self.text.paint(pos, layout.size.line_height, cx);
// }
// }
// #[derive(Clone, Debug, Default)]
// struct LayoutRect {
// point: AlacPoint<i32, i32>,
// num_of_cells: usize,
// color: Hsla,
// }
// impl LayoutRect {
// fn new(point: AlacPoint<i32, i32>, num_of_cells: usize, color: Hsla) -> LayoutRect {
// LayoutRect {
// point,
// num_of_cells,
// color,
// }
// }
// fn extend(&self) -> Self {
// LayoutRect {
// point: self.point,
// num_of_cells: self.num_of_cells + 1,
// color: self.color,
// }
// }
// fn paint(
// &self,
// origin: Point<Pixels>,
// layout: &LayoutState,
// _view: &mut TerminalView,
// cx: &mut ViewContext<TerminalView>,
// ) {
// let position = {
// let alac_point = self.point;
// point(
// (origin.x + alac_point.column as f32 * layout.size.cell_width).floor(),
// origin.y + alac_point.line as f32 * layout.size.line_height,
// )
// };
// let size = point(
// (layout.size.cell_width * self.num_of_cells as f32).ceil(),
// layout.size.line_height,
// )
// .into();
// cx.paint_quad(
// Bounds::new(position, size),
// Default::default(),
// self.color,
// Default::default(),
// transparent_black(),
// );
// }
// }
// ///The GPUI element that paints the terminal.
// ///We need to keep a reference to the view for mouse events, do we need it for any other terminal stuff, or can we move that to connection?
// pub struct TerminalElement {
// terminal: WeakModel<Terminal>,
// focused: bool,
// cursor_visible: bool,
// can_navigate_to_selected_word: bool,
// }
// impl TerminalElement {
// pub fn new(
// terminal: WeakModel<Terminal>,
// focused: bool,
// cursor_visible: bool,
// can_navigate_to_selected_word: bool,
// ) -> TerminalElement {
// TerminalElement {
// terminal,
// focused,
// cursor_visible,
// can_navigate_to_selected_word,
// }
// }
// //Vec<Range<AlacPoint>> -> Clip out the parts of the ranges
// fn layout_grid(
// grid: &Vec<IndexedCell>,
// text_style: &TextStyle,
// terminal_theme: &TerminalStyle,
// text_layout_cache: &TextLayoutCache,
// font_cache: &FontCache,
// hyperlink: Option<(HighlightStyle, &RangeInclusive<AlacPoint>)>,
// ) -> (Vec<LayoutCell>, Vec<LayoutRect>) {
// let mut cells = vec![];
// let mut rects = vec![];
// let mut cur_rect: Option<LayoutRect> = None;
// let mut cur_alac_color = None;
// let linegroups = grid.into_iter().group_by(|i| i.point.line);
// for (line_index, (_, line)) in linegroups.into_iter().enumerate() {
// for cell in line {
// let mut fg = cell.fg;
// let mut bg = cell.bg;
// if cell.flags.contains(Flags::INVERSE) {
// mem::swap(&mut fg, &mut bg);
// }
// //Expand background rect range
// {
// if matches!(bg, Named(NamedColor::Background)) {
// //Continue to next cell, resetting variables if necessary
// cur_alac_color = None;
// if let Some(rect) = cur_rect {
// rects.push(rect);
// cur_rect = None
// }
// } else {
// match cur_alac_color {
// Some(cur_color) => {
// if bg == cur_color {
// cur_rect = cur_rect.take().map(|rect| rect.extend());
// } else {
// cur_alac_color = Some(bg);
// if cur_rect.is_some() {
// rects.push(cur_rect.take().unwrap());
// }
// cur_rect = Some(LayoutRect::new(
// AlacPoint::new(
// line_index as i32,
// cell.point.column.0 as i32,
// ),
// 1,
// convert_color(&bg, &terminal_theme),
// ));
// }
// }
// None => {
// cur_alac_color = Some(bg);
// cur_rect = Some(LayoutRect::new(
// AlacPoint::new(line_index as i32, cell.point.column.0 as i32),
// 1,
// convert_color(&bg, &terminal_theme),
// ));
// }
// }
// }
// }
// //Layout current cell text
// {
// let cell_text = &cell.c.to_string();
// if !is_blank(&cell) {
// let cell_style = TerminalElement::cell_style(
// &cell,
// fg,
// terminal_theme,
// text_style,
// font_cache,
// hyperlink,
// );
// let layout_cell = text_layout_cache.layout_str(
// cell_text,
// text_style.font_size,
// &[(cell_text.len(), cell_style)],
// );
// cells.push(LayoutCell::new(
// AlacPoint::new(line_index as i32, cell.point.column.0 as i32),
// layout_cell,
// ))
// };
// }
// }
// if cur_rect.is_some() {
// rects.push(cur_rect.take().unwrap());
// }
// }
// (cells, rects)
// }
// // Compute the cursor position and expected block width, may return a zero width if x_for_index returns
// // the same position for sequential indexes. Use em_width instead
// fn shape_cursor(
// cursor_point: DisplayCursor,
// size: TerminalSize,
// text_fragment: &Line,
// ) -> Option<(Point<Pixels>, Pixels)> {
// if cursor_point.line() < size.total_lines() as i32 {
// let cursor_width = if text_fragment.width == Pixels::ZERO {
// size.cell_width()
// } else {
// text_fragment.width
// };
// //Cursor should always surround as much of the text as possible,
// //hence when on pixel boundaries round the origin down and the width up
// Some((
// point(
// (cursor_point.col() as f32 * size.cell_width()).floor(),
// (cursor_point.line() as f32 * size.line_height()).floor(),
// ),
// cursor_width.ceil(),
// ))
// } else {
// None
// }
// }
// ///Convert the Alacritty cell styles to GPUI text styles and background color
// fn cell_style(
// indexed: &IndexedCell,
// fg: terminal::alacritty_terminal::ansi::Color,
// style: &TerminalStyle,
// text_style: &TextStyle,
// font_cache: &FontCache,
// hyperlink: Option<(HighlightStyle, &RangeInclusive<AlacPoint>)>,
// ) -> RunStyle {
// let flags = indexed.cell.flags;
// let fg = convert_color(&fg, &style);
// let mut underline = flags
// .intersects(Flags::ALL_UNDERLINES)
// .then(|| Underline {
// color: Some(fg),
// squiggly: flags.contains(Flags::UNDERCURL),
// thickness: OrderedFloat(1.),
// })
// .unwrap_or_default();
// if indexed.cell.hyperlink().is_some() {
// if underline.thickness == OrderedFloat(0.) {
// underline.thickness = OrderedFloat(1.);
// }
// }
// let mut properties = Properties::new();
// if indexed.flags.intersects(Flags::BOLD | Flags::DIM_BOLD) {
// properties = *properties.weight(FontWeight::BOLD);
// }
// if indexed.flags.intersects(Flags::ITALIC) {
// properties = *properties.style(FontStyle::Italic);
// }
// let font_id = font_cache
// .select_font(text_style.font_family, &properties)
// .unwrap_or(text_style.font_id);
// let mut result = RunStyle {
// color: fg,
// font_id,
// underline,
// };
// if let Some((style, range)) = hyperlink {
// if range.contains(&indexed.point) {
// if let Some(underline) = style.underline {
// result.underline = underline;
// }
// if let Some(color) = style.color {
// result.color = color;
// }
// }
// }
// result
// }
// fn generic_button_handler<E>(
// connection: WeakModel<Terminal>,
// origin: Point<Pixels>,
// f: impl Fn(&mut Terminal, Point<Pixels>, E, &mut ModelContext<Terminal>),
// ) -> impl Fn(E, &mut TerminalView, &mut EventContext<TerminalView>) {
// move |event, _: &mut TerminalView, cx| {
// cx.focus_parent();
// if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, cx| {
// f(terminal, origin, event, cx);
// cx.notify();
// })
// }
// }
// }
// fn attach_mouse_handlers(
// &self,
// origin: Point<Pixels>,
// visible_bounds: Bounds<Pixels>,
// mode: TermMode,
// cx: &mut ViewContext<TerminalView>,
// ) {
// let connection = self.terminal;
// let mut region = MouseRegion::new::<Self>(cx.view_id(), 0, visible_bounds);
// // Terminal Emulator controlled behavior:
// region = region
// // Start selections
// .on_down(MouseButton::Left, move |event, v: &mut TerminalView, cx| {
// let terminal_view = cx.handle();
// cx.focus(&terminal_view);
// v.context_menu.update(cx, |menu, _cx| menu.delay_cancel());
// if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, cx| {
// terminal.mouse_down(&event, origin);
// cx.notify();
// })
// }
// })
// // Update drag selections
// .on_drag(MouseButton::Left, move |event, _: &mut TerminalView, cx| {
// if event.end {
// return;
// }
// if cx.is_self_focused() {
// if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, cx| {
// terminal.mouse_drag(event, origin);
// cx.notify();
// })
// }
// }
// })
// // Copy on up behavior
// .on_up(
// MouseButton::Left,
// TerminalElement::generic_button_handler(
// connection,
// origin,
// move |terminal, origin, e, cx| {
// terminal.mouse_up(&e, origin, cx);
// },
// ),
// )
// // Context menu
// .on_click(
// MouseButton::Right,
// move |event, view: &mut TerminalView, cx| {
// let mouse_mode = if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, _cx| terminal.mouse_mode(event.shift))
// } else {
// // If we can't get the model handle, probably can't deploy the context menu
// true
// };
// if !mouse_mode {
// view.deploy_context_menu(event.position, cx);
// }
// },
// )
// .on_move(move |event, _: &mut TerminalView, cx| {
// if cx.is_self_focused() {
// if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, cx| {
// terminal.mouse_move(&event, origin);
// cx.notify();
// })
// }
// }
// })
// .on_scroll(move |event, _: &mut TerminalView, cx| {
// if let Some(conn_handle) = connection.upgrade() {
// conn_handle.update(cx, |terminal, cx| {
// terminal.scroll_wheel(event, origin);
// cx.notify();
// })
// }
// });
// // Mouse mode handlers:
// // All mouse modes need the extra click handlers
// if mode.intersects(TermMode::MOUSE_MODE) {
// region = region
// .on_down(
// MouseButton::Right,
// TerminalElement::generic_button_handler(
// connection,
// origin,
// move |terminal, origin, e, _cx| {
// terminal.mouse_down(&e, origin);
// },
// ),
// )
// .on_down(
// MouseButton::Middle,
// TerminalElement::generic_button_handler(
// connection,
// origin,
// move |terminal, origin, e, _cx| {
// terminal.mouse_down(&e, origin);
// },
// ),
// )
// .on_up(
// MouseButton::Right,
// TerminalElement::generic_button_handler(
// connection,
// origin,
// move |terminal, origin, e, cx| {
// terminal.mouse_up(&e, origin, cx);
// },
// ),
// )
// .on_up(
// MouseButton::Middle,
// TerminalElement::generic_button_handler(
// connection,
// origin,
// move |terminal, origin, e, cx| {
// terminal.mouse_up(&e, origin, cx);
// },
// ),
// )
// }
// cx.scene().push_mouse_region(region);
// }
// }
// impl Element<TerminalView> for TerminalElement {
// type ElementState = LayoutState;
// fn layout(
// &mut self,
// view_state: &mut TerminalView,
// element_state: Option<Self::ElementState>,
// cx: &mut ViewContext<TerminalView>,
// ) -> (LayoutId, Self::ElementState) {
// let settings = ThemeSettings::get_global(cx);
// let terminal_settings = TerminalSettings::get_global(cx);
// //Setup layout information
// let terminal_theme = settings.theme.terminal.clone(); //TODO: Try to minimize this clone.
// let link_style = settings.theme.editor.link_definition;
// let tooltip_style = settings.theme.tooltip.clone();
// let font_cache = cx.font_cache();
// let font_size = font_size(&terminal_settings, cx).unwrap_or(settings.buffer_font_size(cx));
// let font_family_name = terminal_settings
// .font_family
// .as_ref()
// .unwrap_or(&settings.buffer_font_family_name);
// let font_features = terminal_settings
// .font_features
// .as_ref()
// .unwrap_or(&settings.buffer_font_features);
// let family_id = font_cache
// .load_family(&[font_family_name], &font_features)
// .log_err()
// .unwrap_or(settings.buffer_font_family);
// let font_id = font_cache
// .select_font(family_id, &Default::default())
// .unwrap();
// let text_style = TextStyle {
// color: settings.theme.editor.text_color,
// font_family_id: family_id,
// font_family_name: font_cache.family_name(family_id).unwrap(),
// font_id,
// font_size,
// font_properties: Default::default(),
// underline: Default::default(),
// soft_wrap: false,
// };
// let selection_color = settings.theme.editor.selection.selection;
// let match_color = settings.theme.search.match_background;
// let gutter;
// let dimensions = {
// let line_height = text_style.font_size * terminal_settings.line_height.value();
// let cell_width = font_cache.em_advance(text_style.font_id, text_style.font_size);
// gutter = cell_width;
// let size = constraint.max - point(gutter, 0.);
// TerminalSize::new(line_height, cell_width, size)
// };
// let search_matches = if let Some(terminal_model) = self.terminal.upgrade() {
// terminal_model.read(cx).matches.clone()
// } else {
// Default::default()
// };
// let background_color = terminal_theme.background;
// let terminal_handle = self.terminal.upgrade().unwrap();
// let last_hovered_word = terminal_handle.update(cx, |terminal, cx| {
// terminal.set_size(dimensions);
// terminal.try_sync(cx);
// if self.can_navigate_to_selected_word && terminal.can_navigate_to_selected_word() {
// terminal.last_content.last_hovered_word.clone()
// } else {
// None
// }
// });
// let hyperlink_tooltip = last_hovered_word.clone().map(|hovered_word| {
// let mut tooltip = Overlay::new(
// Empty::new()
// .contained()
// .constrained()
// .with_width(dimensions.width())
// .with_height(dimensions.height())
// .with_tooltip::<TerminalElement>(
// hovered_word.id,
// hovered_word.word,
// None,
// tooltip_style,
// cx,
// ),
// )
// .with_position_mode(gpui::OverlayPositionMode::Local)
// .into_any();
// tooltip.layout(
// SizeConstraint::new(Point::zero(), cx.window_size()),
// view_state,
// cx,
// );
// tooltip
// });
// let TerminalContent {
// cells,
// mode,
// display_offset,
// cursor_char,
// selection,
// cursor,
// ..
// } = { &terminal_handle.read(cx).last_content };
// // searches, highlights to a single range representations
// let mut relative_highlighted_ranges = Vec::new();
// for search_match in search_matches {
// relative_highlighted_ranges.push((search_match, match_color))
// }
// if let Some(selection) = selection {
// relative_highlighted_ranges.push((selection.start..=selection.end, selection_color));
// }
// // then have that representation be converted to the appropriate highlight data structure
// let (cells, rects) = TerminalElement::layout_grid(
// cells,
// &text_style,
// &terminal_theme,
// cx.text_layout_cache(),
// cx.font_cache(),
// last_hovered_word
// .as_ref()
// .map(|last_hovered_word| (link_style, &last_hovered_word.word_match)),
// );
// //Layout cursor. Rectangle is used for IME, so we should lay it out even
// //if we don't end up showing it.
// let cursor = if let AlacCursorShape::Hidden = cursor.shape {
// None
// } else {
// let cursor_point = DisplayCursor::from(cursor.point, *display_offset);
// let cursor_text = {
// let str_trxt = cursor_char.to_string();
// let color = if self.focused {
// terminal_theme.background
// } else {
// terminal_theme.foreground
// };
// cx.text_layout_cache().layout_str(
// &str_trxt,
// text_style.font_size,
// &[(
// str_trxt.len(),
// RunStyle {
// font_id: text_style.font_id,
// color,
// underline: Default::default(),
// },
// )],
// )
// };
// let focused = self.focused;
// TerminalElement::shape_cursor(cursor_point, dimensions, &cursor_text).map(
// move |(cursor_position, block_width)| {
// let (shape, text) = match cursor.shape {
// AlacCursorShape::Block if !focused => (CursorShape::Hollow, None),
// AlacCursorShape::Block => (CursorShape::Block, Some(cursor_text)),
// AlacCursorShape::Underline => (CursorShape::Underscore, None),
// AlacCursorShape::Beam => (CursorShape::Bar, None),
// AlacCursorShape::HollowBlock => (CursorShape::Hollow, None),
// //This case is handled in the if wrapping the whole cursor layout
// AlacCursorShape::Hidden => unreachable!(),
// };
// Cursor::new(
// cursor_position,
// block_width,
// dimensions.line_height,
// terminal_theme.cursor,
// shape,
// text,
// )
// },
// )
// };
// //Done!
// (
// constraint.max,
// Self::ElementState {
// cells,
// cursor,
// background_color,
// size: dimensions,
// rects,
// relative_highlighted_ranges,
// mode: *mode,
// display_offset: *display_offset,
// hyperlink_tooltip,
// gutter,
// },
// )
// }
// fn paint(
// &mut self,
// bounds: Bounds<Pixels>,
// view_state: &mut TerminalView,
// element_state: &mut Self::ElementState,
// cx: &mut ViewContext<TerminalView>,
// ) {
// let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
// //Setup element stuff
// let clip_bounds = Some(visible_bounds);
// cx.paint_layer(clip_bounds, |cx| {
// let origin = bounds.origin + point(element_state.gutter, 0.);
// // Elements are ephemeral, only at paint time do we know what could be clicked by a mouse
// self.attach_mouse_handlers(origin, visible_bounds, element_state.mode, cx);
// cx.scene().push_cursor_region(gpui::CursorRegion {
// bounds,
// style: if element_state.hyperlink_tooltip.is_some() {
// CursorStyle::AlacPointingHand
// } else {
// CursorStyle::IBeam
// },
// });
// cx.paint_layer(clip_bounds, |cx| {
// //Start with a background color
// cx.scene().push_quad(Quad {
// bounds,
// background: Some(element_state.background_color),
// border: Default::default(),
// corner_radii: Default::default(),
// });
// for rect in &element_state.rects {
// rect.paint(origin, element_state, view_state, cx);
// }
// });
// //Draw Highlighted Backgrounds
// cx.paint_layer(clip_bounds, |cx| {
// for (relative_highlighted_range, color) in
// element_state.relative_highlighted_ranges.iter()
// {
// if let Some((start_y, highlighted_range_lines)) = to_highlighted_range_lines(
// relative_highlighted_range,
// element_state,
// origin,
// ) {
// let hr = HighlightedRange {
// start_y, //Need to change this
// line_height: element_state.size.line_height,
// lines: highlighted_range_lines,
// color: color.clone(),
// //Copied from editor. TODO: move to theme or something
// corner_radius: 0.15 * element_state.size.line_height,
// };
// hr.paint(bounds, cx);
// }
// }
// });
// //Draw the text cells
// cx.paint_layer(clip_bounds, |cx| {
// for cell in &element_state.cells {
// cell.paint(origin, element_state, visible_bounds, view_state, cx);
// }
// });
// //Draw cursor
// if self.cursor_visible {
// if let Some(cursor) = &element_state.cursor {
// cx.paint_layer(clip_bounds, |cx| {
// cursor.paint(origin, cx);
// })
// }
// }
// if let Some(element) = &mut element_state.hyperlink_tooltip {
// element.paint(origin, visible_bounds, view_state, cx)
// }
// });
// }
// fn element_id(&self) -> Option<ElementId> {
// todo!()
// }
// // todo!() remove?
// // fn metadata(&self) -> Option<&dyn std::any::Any> {
// // None
// // }
// // fn debug(
// // &self,
// // _: Bounds<Pixels>,
// // _: &Self::ElementState,
// // _: &Self::PaintState,
// // _: &TerminalView,
// // _: &gpui::ViewContext<TerminalView>,
// // ) -> gpui::serde_json::Value {
// // json!({
// // "type": "TerminalElement",
// // })
// // }
// // fn rect_for_text_range(
// // &self,
// // _: Range<usize>,
// // bounds: Bounds<Pixels>,
// // _: Bounds<Pixels>,
// // layout: &Self::ElementState,
// // _: &Self::PaintState,
// // _: &TerminalView,
// // _: &gpui::ViewContext<TerminalView>,
// // ) -> Option<Bounds<Pixels>> {
// // // Use the same origin that's passed to `Cursor::paint` in the paint
// // // method bove.
// // let mut origin = bounds.origin() + point(layout.size.cell_width, 0.);
// // // TODO - Why is it necessary to move downward one line to get correct
// // // positioning? I would think that we'd want the same rect that is
// // // painted for the cursor.
// // origin += point(0., layout.size.line_height);
// // Some(layout.cursor.as_ref()?.bounding_rect(origin))
// // }
// }
// impl Component<TerminalView> for TerminalElement {
// fn render(self) -> AnyElement<TerminalView> {
// todo!()
// }
// }
// fn is_blank(cell: &IndexedCell) -> bool {
// if cell.c != ' ' {
// return false;
// }
// if cell.bg != AnsiColor::Named(NamedColor::Background) {
// return false;
// }
// if cell.hyperlink().is_some() {
// return false;
// }
// if cell
// .flags
// .intersects(Flags::ALL_UNDERLINES | Flags::INVERSE | Flags::STRIKEOUT)
// {
// return false;
// }
// return true;
// }
// fn to_highlighted_range_lines(
// range: &RangeInclusive<AlacPoint>,
// layout: &LayoutState,
// origin: Point<Pixels>,
// ) -> Option<(Pixels, Vec<HighlightedRangeLine>)> {
// // Step 1. Normalize the points to be viewport relative.
// // When display_offset = 1, here's how the grid is arranged:
// //-2,0 -2,1...
// //--- Viewport top
// //-1,0 -1,1...
// //--------- Terminal Top
// // 0,0 0,1...
// // 1,0 1,1...
// //--- Viewport Bottom
// // 2,0 2,1...
// //--------- Terminal Bottom
// // Normalize to viewport relative, from terminal relative.
// // lines are i32s, which are negative above the top left corner of the terminal
// // If the user has scrolled, we use the display_offset to tell us which offset
// // of the grid data we should be looking at. But for the rendering step, we don't
// // want negatives. We want things relative to the 'viewport' (the area of the grid
// // which is currently shown according to the display offset)
// let unclamped_start = AlacPoint::new(
// range.start().line + layout.display_offset,
// range.start().column,
// );
// let unclamped_end =
// AlacPoint::new(range.end().line + layout.display_offset, range.end().column);
// // Step 2. Clamp range to viewport, and return None if it doesn't overlap
// if unclamped_end.line.0 < 0 || unclamped_start.line.0 > layout.size.num_lines() as i32 {
// return None;
// }
// let clamped_start_line = unclamped_start.line.0.max(0) as usize;
// let clamped_end_line = unclamped_end.line.0.min(layout.size.num_lines() as i32) as usize;
// //Convert the start of the range to pixels
// let start_y = origin.y + clamped_start_line as f32 * layout.size.line_height;
// // Step 3. Expand ranges that cross lines into a collection of single-line ranges.
// // (also convert to pixels)
// let mut highlighted_range_lines = Vec::new();
// for line in clamped_start_line..=clamped_end_line {
// let mut line_start = 0;
// let mut line_end = layout.size.columns();
// if line == clamped_start_line {
// line_start = unclamped_start.column.0 as usize;
// }
// if line == clamped_end_line {
// line_end = unclamped_end.column.0 as usize + 1; //+1 for inclusive
// }
// highlighted_range_lines.push(HighlightedRangeLine {
// start_x: origin.x + line_start as f32 * layout.size.cell_width,
// end_x: origin.x + line_end as f32 * layout.size.cell_width,
// });
// }
// Some((start_y, highlighted_range_lines))
// }
// fn font_size(terminal_settings: &TerminalSettings, cx: &mut AppContext) -> Option<Pixels> {
// terminal_settings
// .font_size
// .map(|size| theme::adjusted_font_size(size, cx))
// }