use crate::{ commands, compositor::{Component, Context, EventResult}, key, keymap::{KeymapResult, Keymaps}, ui::{Completion, ProgressSpinners}, }; use helix_core::{ coords_at_pos, graphemes::{ensure_grapheme_boundary_next, next_grapheme_boundary, prev_grapheme_boundary}, syntax::{self, HighlightEvent}, unicode::segmentation::UnicodeSegmentation, unicode::width::UnicodeWidthStr, LineEnding, Position, Range, Selection, }; use helix_view::{ document::Mode, graphics::{CursorKind, Modifier, Rect, Style}, info::Info, input::KeyEvent, keyboard::{KeyCode, KeyModifiers}, Document, Editor, Theme, View, }; use std::borrow::Cow; use crossterm::event::{Event, MouseButton, MouseEvent, MouseEventKind}; use tui::buffer::Buffer as Surface; pub struct EditorView { keymaps: Keymaps, on_next_key: Option>, last_insert: (commands::Command, Vec), completion: Option, spinners: ProgressSpinners, pub autoinfo: Option, } const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter impl Default for EditorView { fn default() -> Self { Self::new(Keymaps::default()) } } impl EditorView { pub fn new(keymaps: Keymaps) -> Self { Self { keymaps, on_next_key: None, last_insert: (commands::Command::normal_mode, Vec::new()), completion: None, spinners: ProgressSpinners::default(), autoinfo: None, } } pub fn spinners_mut(&mut self) -> &mut ProgressSpinners { &mut self.spinners } #[allow(clippy::too_many_arguments)] pub fn render_view( &self, doc: &Document, view: &View, viewport: Rect, surface: &mut Surface, theme: &Theme, is_focused: bool, loader: &syntax::Loader, ) { let area = Rect::new( view.area.x + OFFSET, view.area.y, view.area.width - OFFSET, view.area.height.saturating_sub(1), ); // - 1 for statusline self.render_buffer(doc, view, area, surface, theme, is_focused, loader); // if we're not at the edge of the screen, draw a right border if viewport.right() != view.area.right() { let x = area.right(); let border_style = theme.get("ui.window"); for y in area.top()..area.bottom() { surface .get_mut(x, y) .set_symbol(tui::symbols::line::VERTICAL) //.set_symbol(" ") .set_style(border_style); } } self.render_diagnostics(doc, view, area, surface, theme, is_focused); let area = Rect::new( view.area.x, view.area.y + view.area.height.saturating_sub(1), view.area.width, 1, ); self.render_statusline(doc, view, area, surface, theme, is_focused); } #[allow(clippy::too_many_arguments)] pub fn render_buffer( &self, doc: &Document, view: &View, viewport: Rect, surface: &mut Surface, theme: &Theme, is_focused: bool, loader: &syntax::Loader, ) { let text = doc.text().slice(..); let last_line = view.last_line(doc); let range = { // calculate viewport byte ranges let start = text.line_to_byte(view.first_line); let end = text.line_to_byte(last_line + 1); start..end }; // TODO: range doesn't actually restrict source, just highlight range let highlights: Vec<_> = match doc.syntax() { Some(syntax) => { let scopes = theme.scopes(); syntax .highlight_iter(text.slice(..), Some(range), None, |language| { loader .language_config_for_scope(&format!("source.{}", language)) .and_then(|language_config| { let config = language_config.highlight_config(scopes)?; let config_ref = config.as_ref(); // SAFETY: the referenced `HighlightConfiguration` behind // the `Arc` is guaranteed to remain valid throughout the // duration of the highlight. let config_ref = unsafe { std::mem::transmute::< _, &'static syntax::HighlightConfiguration, >(config_ref) }; Some(config_ref) }) }) .collect() // TODO: we collect here to avoid holding the lock, fix later } None => vec![Ok(HighlightEvent::Source { start: range.start, end: range.end, })], }; let mut spans = Vec::new(); let mut visual_x = 0u16; let mut line = 0u16; let tab_width = doc.tab_width(); let tab = " ".repeat(tab_width); let highlights = highlights.into_iter().map(|event| match event.unwrap() { // convert byte offsets to char offset HighlightEvent::Source { start, end } => { let start = ensure_grapheme_boundary_next(text, text.byte_to_char(start)); let end = ensure_grapheme_boundary_next(text, text.byte_to_char(end)); HighlightEvent::Source { start, end } } event => event, }); let selections = doc.selection(view.id); let primary_idx = selections.primary_index(); let selection_scope = theme .find_scope_index("ui.selection") .expect("no selection scope found!"); let base_cursor_scope = theme .find_scope_index("ui.cursor") .unwrap_or(selection_scope); let cursor_scope = match doc.mode() { Mode::Insert => theme.find_scope_index("ui.cursor.insert"), Mode::Select => theme.find_scope_index("ui.cursor.select"), Mode::Normal => Some(base_cursor_scope), } .unwrap_or(base_cursor_scope); let highlights: Box> = if is_focused { // TODO: primary + insert mode patching: // (ui.cursor.primary).patch(mode).unwrap_or(cursor) let primary_cursor_scope = theme .find_scope_index("ui.cursor.primary") .unwrap_or(cursor_scope); let primary_selection_scope = theme .find_scope_index("ui.selection.primary") .unwrap_or(selection_scope); // inject selections as highlight scopes let mut spans: Vec<(usize, std::ops::Range)> = Vec::new(); for (i, range) in selections.iter().enumerate() { let (cursor_scope, selection_scope) = if i == primary_idx { (primary_cursor_scope, primary_selection_scope) } else { (cursor_scope, selection_scope) }; // Special-case: cursor at end of the rope. if range.head == range.anchor && range.head == text.len_chars() { spans.push((cursor_scope, range.head..range.head + 1)); continue; } let range = range.min_width_1(text); if range.head > range.anchor { // Standard case. let cursor_start = prev_grapheme_boundary(text, range.head); spans.push((selection_scope, range.anchor..cursor_start)); spans.push((cursor_scope, cursor_start..range.head)); } else { // Reverse case. let cursor_end = next_grapheme_boundary(text, range.head); spans.push((cursor_scope, range.head..cursor_end)); spans.push((selection_scope, cursor_end..range.anchor)); } } Box::new(syntax::merge(highlights, spans)) } else { Box::new(highlights) }; // diagnostic injection let diagnostic_scope = theme.find_scope_index("diagnostic").unwrap_or(cursor_scope); let highlights = Box::new(syntax::merge( highlights, doc.diagnostics() .iter() .map(|diagnostic| { ( diagnostic_scope, diagnostic.range.start..diagnostic.range.end, ) }) .collect(), )); 'outer: for event in highlights { match event { HighlightEvent::HighlightStart(span) => { spans.push(span); } HighlightEvent::HighlightEnd => { spans.pop(); } HighlightEvent::Source { start, end } => { // `unwrap_or_else` part is for off-the-end indices of // the rope, to allow cursor highlighting at the end // of the rope. let text = text.get_slice(start..end).unwrap_or_else(|| " ".into()); use helix_core::graphemes::{grapheme_width, RopeGraphemes}; let style = spans.iter().fold(theme.get("ui.text"), |acc, span| { let style = theme.get(theme.scopes()[span.0].as_str()); acc.patch(style) }); for grapheme in RopeGraphemes::new(text) { let out_of_bounds = visual_x < view.first_col as u16 || visual_x >= viewport.width + view.first_col as u16; if LineEnding::from_rope_slice(&grapheme).is_some() { if !out_of_bounds { // we still want to render an empty cell with the style surface.set_string( viewport.x + visual_x - view.first_col as u16, viewport.y + line, " ", style, ); } visual_x = 0; line += 1; // TODO: with proper iter this shouldn't be necessary if line >= viewport.height { break 'outer; } } else { let grapheme = Cow::from(grapheme); let (grapheme, width) = if grapheme == "\t" { // make sure we display tab as appropriate amount of spaces (tab.as_str(), tab_width) } else { // Cow will prevent allocations if span contained in a single slice // which should really be the majority case let width = grapheme_width(&grapheme); (grapheme.as_ref(), width) }; if !out_of_bounds { // if we're offscreen just keep going until we hit a new line surface.set_string( viewport.x + visual_x - view.first_col as u16, viewport.y + line, grapheme, style, ); } visual_x = visual_x.saturating_add(width as u16); } } } } } // render gutters let linenr: Style = theme.get("ui.linenr"); let warning: Style = theme.get("warning"); let error: Style = theme.get("error"); let info: Style = theme.get("info"); let hint: Style = theme.get("hint"); // Whether to draw the line number for the last line of the // document or not. We only draw it if it's not an empty line. let draw_last = text.line_to_byte(last_line) < text.len_bytes(); for (i, line) in (view.first_line..(last_line + 1)).enumerate() { use helix_core::diagnostic::Severity; if let Some(diagnostic) = doc.diagnostics().iter().find(|d| d.line == line) { surface.set_stringn( viewport.x - OFFSET, viewport.y + i as u16, "●", 1, match diagnostic.severity { Some(Severity::Error) => error, Some(Severity::Warning) | None => warning, Some(Severity::Info) => info, Some(Severity::Hint) => hint, }, ); } // Line numbers having selections are rendered // differently, further below. let line_number_text = if line == last_line && !draw_last { " ~".into() } else { format!("{:>5}", line + 1) }; surface.set_stringn( viewport.x + 1 - OFFSET, viewport.y + i as u16, line_number_text, 5, linenr, ); } // render selections and selected linenr(s) let linenr_select: Style = theme .try_get("ui.linenr.selected") .unwrap_or_else(|| theme.get("ui.linenr")); if is_focused { let screen = { let start = text.line_to_char(view.first_line); let end = text.line_to_char(last_line + 1) + 1; // +1 for cursor at end of text. Range::new(start, end) }; let selection = doc.selection(view.id); for selection in selection.iter().filter(|range| range.overlaps(&screen)) { let head = view.screen_coords_at_pos( doc, text, if selection.head > selection.anchor { selection.head - 1 } else { selection.head }, ); if let Some(head) = head { // Draw line number for selected lines. let line_number = view.first_line + head.row; let line_number_text = if line_number == last_line && !draw_last { " ~".into() } else { format!("{:>5}", line_number + 1) }; surface.set_stringn( viewport.x + 1 - OFFSET, viewport.y + head.row as u16, line_number_text, 5, linenr_select, ); // TODO: set cursor position for IME if let Some(syntax) = doc.syntax() { use helix_core::match_brackets; let pos = doc .selection(view.id) .primary() .cursor(doc.text().slice(..)); let pos = match_brackets::find(syntax, doc.text(), pos) .and_then(|pos| view.screen_coords_at_pos(doc, text, pos)); if let Some(pos) = pos { // ensure col is on screen if (pos.col as u16) < viewport.width + view.first_col as u16 && pos.col >= view.first_col { let style = theme.try_get("ui.cursor.match").unwrap_or_else(|| { Style::default() .add_modifier(Modifier::REVERSED) .add_modifier(Modifier::DIM) }); surface .get_mut( viewport.x + pos.col as u16, viewport.y + pos.row as u16, ) .set_style(style); } } } } } } } pub fn render_diagnostics( &self, doc: &Document, view: &View, viewport: Rect, surface: &mut Surface, theme: &Theme, _is_focused: bool, ) { use helix_core::diagnostic::Severity; use tui::{ layout::Alignment, text::Text, widgets::{Paragraph, Widget}, }; let cursor = doc .selection(view.id) .primary() .cursor(doc.text().slice(..)); let diagnostics = doc.diagnostics().iter().filter(|diagnostic| { diagnostic.range.start <= cursor && diagnostic.range.end >= cursor }); let warning: Style = theme.get("warning"); let error: Style = theme.get("error"); let info: Style = theme.get("info"); let hint: Style = theme.get("hint"); // Vec::with_capacity(diagnostics.len()); // rough estimate let mut lines = Vec::new(); for diagnostic in diagnostics { let text = Text::styled( &diagnostic.message, match diagnostic.severity { Some(Severity::Error) => error, Some(Severity::Warning) | None => warning, Some(Severity::Info) => info, Some(Severity::Hint) => hint, }, ); lines.extend(text.lines); } let paragraph = Paragraph::new(lines).alignment(Alignment::Right); let width = 80.min(viewport.width); let height = 15.min(viewport.height); paragraph.render( Rect::new( viewport.right() - width, viewport.y as u16 + 1, width, height, ), surface, ); } #[allow(clippy::too_many_arguments)] pub fn render_statusline( &self, doc: &Document, view: &View, viewport: Rect, surface: &mut Surface, theme: &Theme, is_focused: bool, ) { //------------------------------- // Left side of the status line. //------------------------------- let mode = match doc.mode() { Mode::Insert => "INS", Mode::Select => "SEL", Mode::Normal => "NOR", }; let progress = doc .language_server() .and_then(|srv| { self.spinners .get(srv.id()) .and_then(|spinner| spinner.frame()) }) .unwrap_or(""); let style = if is_focused { theme.get("ui.statusline") } else { theme.get("ui.statusline.inactive") }; // statusline surface.set_style(Rect::new(viewport.x, viewport.y, viewport.width, 1), style); if is_focused { surface.set_string(viewport.x + 1, viewport.y, mode, style); } surface.set_string(viewport.x + 5, viewport.y, progress, style); if let Some(path) = doc.relative_path() { let path = path.to_string_lossy(); let title = format!("{}{}", path, if doc.is_modified() { "[+]" } else { "" }); surface.set_stringn( viewport.x + 8, viewport.y, title, viewport.width.saturating_sub(6) as usize, style, ); } //------------------------------- // Right side of the status line. //------------------------------- // Compute the individual info strings. let diag_count = format!("{}", doc.diagnostics().len()); // let indent_info = match doc.indent_style { // IndentStyle::Tabs => "tabs", // IndentStyle::Spaces(1) => "spaces:1", // IndentStyle::Spaces(2) => "spaces:2", // IndentStyle::Spaces(3) => "spaces:3", // IndentStyle::Spaces(4) => "spaces:4", // IndentStyle::Spaces(5) => "spaces:5", // IndentStyle::Spaces(6) => "spaces:6", // IndentStyle::Spaces(7) => "spaces:7", // IndentStyle::Spaces(8) => "spaces:8", // _ => "indent:ERROR", // }; let position_info = { let pos = coords_at_pos( doc.text().slice(..), doc.selection(view.id) .primary() .cursor(doc.text().slice(..)), ); format!("{}:{}", pos.row + 1, pos.col + 1) // convert to 1-indexing }; // Render them to the status line together. let right_side_text = format!( "{} {} ", &diag_count[..diag_count.len().min(4)], // indent_info, position_info ); let text_len = right_side_text.len() as u16; surface.set_string( viewport.x + viewport.width.saturating_sub(text_len), viewport.y, right_side_text, style, ); } /// Handle events by looking them up in `self.keymaps`. Returns None /// if event was handled (a command was executed or a subkeymap was /// activated). Only KeymapResult::{NotFound, Cancelled} is returned /// otherwise. fn handle_keymap_event( &mut self, mode: Mode, cxt: &mut commands::Context, event: KeyEvent, ) -> Option { self.autoinfo = None; match self.keymaps.get_mut(&mode).unwrap().get(event) { KeymapResult::Matched(command) => command.execute(cxt), KeymapResult::Pending(node) => self.autoinfo = Some(node.into()), k @ KeymapResult::NotFound | k @ KeymapResult::Cancelled(_) => return Some(k), } None } fn insert_mode(&mut self, cx: &mut commands::Context, event: KeyEvent) { if let Some(keyresult) = self.handle_keymap_event(Mode::Insert, cx, event) { match keyresult { KeymapResult::NotFound => { if let Some(ch) = event.char() { commands::insert::insert_char(cx, ch) } } KeymapResult::Cancelled(pending) => { for ev in pending { match ev.char() { Some(ch) => commands::insert::insert_char(cx, ch), None => { if let KeymapResult::Matched(command) = self.keymaps.get_mut(&Mode::Insert).unwrap().get(ev) { command.execute(cx); } } } } } _ => unreachable!(), } } } fn command_mode(&mut self, mode: Mode, cxt: &mut commands::Context, event: KeyEvent) { match event { // count handling key!(i @ '0'..='9') => { let i = i.to_digit(10).unwrap() as usize; cxt.editor.count = std::num::NonZeroUsize::new(cxt.editor.count.map_or(i, |c| c.get() * 10 + i)); } // special handling for repeat operator key!('.') => { // first execute whatever put us into insert mode self.last_insert.0.execute(cxt); // then replay the inputs for &key in &self.last_insert.1.clone() { self.insert_mode(cxt, key) } } _ => { // set the count cxt.count = cxt.editor.count; // TODO: edge case: 0j -> reset to 1 // if this fails, count was Some(0) // debug_assert!(cxt.count != 0); // set the register cxt.selected_register = cxt.editor.selected_register.take(); self.handle_keymap_event(mode, cxt, event); if self.keymaps.pending().is_empty() { cxt.editor.count = None } } } } pub fn set_completion( &mut self, items: Vec, offset_encoding: helix_lsp::OffsetEncoding, trigger_offset: usize, size: Rect, ) { let mut completion = Completion::new(items, offset_encoding, trigger_offset); // TODO : propagate required size on resize to completion too completion.required_size((size.width, size.height)); self.completion = Some(completion); } } impl Component for EditorView { fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult { match event { Event::Resize(width, height) => { // HAXX: offset the render area height by 1 to account for prompt/commandline cx.editor.resize(Rect::new(0, 0, width, height - 1)); EventResult::Consumed(None) } Event::Key(key) => { let mut key = KeyEvent::from(key); canonicalize_key(&mut key); // clear status cx.editor.status_msg = None; let (_, doc) = current!(cx.editor); let mode = doc.mode(); let mut cxt = commands::Context { selected_register: helix_view::RegisterSelection::default(), editor: &mut cx.editor, count: None, callback: None, on_next_key_callback: None, jobs: cx.jobs, }; if let Some(on_next_key) = self.on_next_key.take() { // if there's a command waiting input, do that first on_next_key(&mut cxt, key); } else { match mode { Mode::Insert => { // record last_insert key self.last_insert.1.push(key); // let completion swallow the event if necessary let mut consumed = false; if let Some(completion) = &mut self.completion { // use a fake context here let mut cx = Context { editor: cxt.editor, jobs: cxt.jobs, scroll: None, }; let res = completion.handle_event(event, &mut cx); if let EventResult::Consumed(callback) = res { consumed = true; if callback.is_some() { // assume close_fn self.completion = None; } } } // if completion didn't take the event, we pass it onto commands if !consumed { self.insert_mode(&mut cxt, key); // lastly we recalculate completion if let Some(completion) = &mut self.completion { completion.update(&mut cxt); if completion.is_empty() { self.completion = None; } } } } mode => self.command_mode(mode, &mut cxt, key), } } self.on_next_key = cxt.on_next_key_callback.take(); // appease borrowck let callback = cxt.callback.take(); // if the command consumed the last view, skip the render. // on the next loop cycle the Application will then terminate. if cx.editor.should_close() { return EventResult::Ignored; } let (view, doc) = current!(cx.editor); view.ensure_cursor_in_view(doc); // mode transitions match (mode, doc.mode()) { (Mode::Normal, Mode::Insert) => { // HAXX: if we just entered insert mode from normal, clear key buf // and record the command that got us into this mode. // how we entered insert mode is important, and we should track that so // we can repeat the side effect. self.last_insert.0 = match self.keymaps.get_mut(&mode).unwrap().get(key) { KeymapResult::Matched(command) => command, // FIXME: insert mode can only be entered through single KeyCodes _ => unimplemented!(), }; self.last_insert.1.clear(); } (Mode::Insert, Mode::Normal) => { // if exiting insert mode, remove completion self.completion = None; } _ => (), } EventResult::Consumed(callback) } Event::Mouse(MouseEvent { kind: MouseEventKind::Down(MouseButton::Left), row, column, modifiers, .. }) => { let editor = &mut cx.editor; let result = editor.tree.views().find_map(|(view, _focus)| { view.pos_at_screen_coords(&editor.documents[view.doc], row, column) .map(|pos| (pos, view.id)) }); if let Some((pos, view_id)) = result { let doc = &mut editor.documents[editor.tree.get(view_id).doc]; if modifiers == crossterm::event::KeyModifiers::ALT { let selection = doc.selection(view_id).clone(); doc.set_selection(view_id, selection.push(Range::point(pos))); } else { doc.set_selection(view_id, Selection::point(pos)); } editor.tree.focus = view_id; return EventResult::Consumed(None); } EventResult::Ignored } Event::Mouse(MouseEvent { kind: MouseEventKind::Drag(MouseButton::Left), row, column, .. }) => { let (view, doc) = current!(cx.editor); let pos = match view.pos_at_screen_coords(doc, row, column) { Some(pos) => pos, None => return EventResult::Ignored, }; let mut selection = doc.selection(view.id).clone(); let primary = selection.primary_mut(); *primary = Range::new(primary.anchor, pos); doc.set_selection(view.id, selection); EventResult::Consumed(None) } Event::Mouse(_) => EventResult::Ignored, } } fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) { // clear with background color surface.set_style(area, cx.editor.theme.get("ui.background")); // if the terminal size suddenly changed, we need to trigger a resize cx.editor .resize(Rect::new(area.x, area.y, area.width, area.height - 1)); // - 1 to account for commandline for (view, is_focused) in cx.editor.tree.views() { let doc = cx.editor.document(view.doc).unwrap(); let loader = &cx.editor.syn_loader; self.render_view( doc, view, area, surface, &cx.editor.theme, is_focused, loader, ); } if let Some(ref info) = self.autoinfo { info.render(area, surface, cx); } let key_width = 15u16; // for showing pending keys let mut status_msg_width = 0; // render status msg if let Some((status_msg, severity)) = &cx.editor.status_msg { status_msg_width = status_msg.width(); use helix_view::editor::Severity; let style = if *severity == Severity::Error { cx.editor.theme.get("error") } else { cx.editor.theme.get("ui.text") }; surface.set_string( area.x, area.y + area.height.saturating_sub(1), status_msg, style, ); } if area.width.saturating_sub(status_msg_width as u16) > key_width { let mut disp = String::new(); if let Some(count) = cx.editor.count { disp.push_str(&count.to_string()) } for key in self.keymaps.pending() { let s = key.to_string(); if s.graphemes(true).count() > 1 { disp.push_str(&format!("<{}>", s)); } else { disp.push_str(&s); } } surface.set_string( area.x + area.width.saturating_sub(key_width), area.y + area.height.saturating_sub(1), disp.get(disp.len().saturating_sub(key_width as usize)..) .unwrap_or(&disp), cx.editor.theme.get("ui.text"), ); } if let Some(completion) = &self.completion { completion.render(area, surface, cx); } } fn cursor(&self, _area: Rect, editor: &Editor) -> (Option, CursorKind) { // match view.doc.mode() { // Mode::Insert => write!(stdout, "\x1B[6 q"), // mode => write!(stdout, "\x1B[2 q"), // }; editor.cursor() } } fn canonicalize_key(key: &mut KeyEvent) { if let KeyEvent { code: KeyCode::Char(_), modifiers: _, } = key { key.modifiers.remove(KeyModifiers::SHIFT) } }