use crate::{ align_view, document::{DocumentSavedEventFuture, DocumentSavedEventResult, Mode, SavePoint}, graphics::{CursorKind, Rect}, info::Info, input::KeyEvent, register::Registers, theme::{self, Theme}, tree::{self, Tree}, view::ViewPosition, Align, Document, DocumentId, View, ViewId, }; use dap::StackFrame; use helix_vcs::DiffProviderRegistry; use futures_util::stream::select_all::SelectAll; use futures_util::{future, StreamExt}; use helix_lsp::Call; use tokio_stream::wrappers::UnboundedReceiverStream; use std::{ borrow::Cow, cell::Cell, collections::{BTreeMap, HashMap}, io::stdin, num::NonZeroUsize, path::{Path, PathBuf}, pin::Pin, sync::Arc, }; use tokio::{ sync::{ mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender}, oneshot, }, time::{sleep, Duration, Instant, Sleep}, }; use anyhow::{anyhow, bail, Error}; pub use helix_core::diagnostic::Severity; use helix_core::{ auto_pairs::AutoPairs, syntax::{self, AutoPairConfig, SoftWrap}, Change, LineEnding, NATIVE_LINE_ENDING, }; use helix_core::{Position, Selection}; use helix_dap as dap; use helix_lsp::lsp; use serde::{ser::SerializeMap, Deserialize, Deserializer, Serialize, Serializer}; use arc_swap::access::{DynAccess, DynGuard}; fn deserialize_duration_millis<'de, D>(deserializer: D) -> Result where D: serde::Deserializer<'de>, { let millis = u64::deserialize(deserializer)?; Ok(Duration::from_millis(millis)) } fn serialize_duration_millis(duration: &Duration, serializer: S) -> Result where S: Serializer, { serializer.serialize_u64( duration .as_millis() .try_into() .map_err(|_| serde::ser::Error::custom("duration value overflowed u64"))?, ) } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct GutterConfig { /// Gutter Layout pub layout: Vec, /// Options specific to the "line-numbers" gutter pub line_numbers: GutterLineNumbersConfig, } impl Default for GutterConfig { fn default() -> Self { Self { layout: vec![ GutterType::Diagnostics, GutterType::Spacer, GutterType::LineNumbers, GutterType::Spacer, GutterType::Diff, ], line_numbers: GutterLineNumbersConfig::default(), } } } impl From> for GutterConfig { fn from(x: Vec) -> Self { GutterConfig { layout: x, ..Default::default() } } } fn deserialize_gutter_seq_or_struct<'de, D>(deserializer: D) -> Result where D: Deserializer<'de>, { struct GutterVisitor; impl<'de> serde::de::Visitor<'de> for GutterVisitor { type Value = GutterConfig; fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result { write!( formatter, "an array of gutter names or a detailed gutter configuration" ) } fn visit_seq(self, mut seq: S) -> Result where S: serde::de::SeqAccess<'de>, { let mut gutters = Vec::new(); while let Some(gutter) = seq.next_element::()? { gutters.push( gutter .parse::() .map_err(serde::de::Error::custom)?, ) } Ok(gutters.into()) } fn visit_map(self, map: M) -> Result where M: serde::de::MapAccess<'de>, { let deserializer = serde::de::value::MapAccessDeserializer::new(map); Deserialize::deserialize(deserializer) } } deserializer.deserialize_any(GutterVisitor) } #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct GutterLineNumbersConfig { /// Minimum number of characters to use for line number gutter. Defaults to 3. pub min_width: usize, } impl Default for GutterLineNumbersConfig { fn default() -> Self { Self { min_width: 3 } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct FilePickerConfig { /// IgnoreOptions /// Enables ignoring hidden files. /// Whether to hide hidden files in file picker and global search results. Defaults to true. pub hidden: bool, /// Enables following symlinks. /// Whether to follow symbolic links in file picker and file or directory completions. Defaults to true. pub follow_symlinks: bool, /// Hides symlinks that point into the current directory. Defaults to true. pub deduplicate_links: bool, /// Enables reading ignore files from parent directories. Defaults to true. pub parents: bool, /// Enables reading `.ignore` files. /// Whether to hide files listed in .ignore in file picker and global search results. Defaults to true. pub ignore: bool, /// Enables reading `.gitignore` files. /// Whether to hide files listed in .gitignore in file picker and global search results. Defaults to true. pub git_ignore: bool, /// Enables reading global .gitignore, whose path is specified in git's config: `core.excludefile` option. /// Whether to hide files listed in global .gitignore in file picker and global search results. Defaults to true. pub git_global: bool, /// Enables reading `.git/info/exclude` files. /// Whether to hide files listed in .git/info/exclude in file picker and global search results. Defaults to true. pub git_exclude: bool, /// WalkBuilder options /// Maximum Depth to recurse directories in file picker and global search. Defaults to `None`. pub max_depth: Option, } impl Default for FilePickerConfig { fn default() -> Self { Self { hidden: true, follow_symlinks: true, deduplicate_links: true, parents: true, ignore: true, git_ignore: true, git_global: true, git_exclude: true, max_depth: None, } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct ExplorerConfig { pub position: ExplorerPosition, /// explorer column width pub column_width: usize, } #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum ExplorerPosition { Left, Right, } impl Default for ExplorerConfig { fn default() -> Self { Self { position: ExplorerPosition::Left, column_width: 36, } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct Config { /// Padding to keep between the edge of the screen and the cursor when scrolling. Defaults to 5. pub scrolloff: usize, /// Number of lines to scroll at once. Defaults to 3 pub scroll_lines: isize, /// Mouse support. Defaults to true. pub mouse: bool, /// Shell to use for shell commands. Defaults to ["cmd", "/C"] on Windows and ["sh", "-c"] otherwise. pub shell: Vec, /// Line number mode. pub line_number: LineNumber, /// Highlight the lines cursors are currently on. Defaults to false. pub cursorline: bool, /// Highlight the columns cursors are currently on. Defaults to false. pub cursorcolumn: bool, #[serde(deserialize_with = "deserialize_gutter_seq_or_struct")] pub gutters: GutterConfig, /// Middle click paste support. Defaults to true. pub middle_click_paste: bool, /// Automatic insertion of pairs to parentheses, brackets, /// etc. Optionally, this can be a list of 2-tuples to specify a /// global list of characters to pair. Defaults to true. pub auto_pairs: AutoPairConfig, /// Automatic auto-completion, automatically pop up without user trigger. Defaults to true. pub auto_completion: bool, /// Automatic formatting on save. Defaults to true. pub auto_format: bool, /// Automatic save on focus lost. Defaults to false. pub auto_save: bool, /// Set a global text_width pub text_width: usize, /// Time in milliseconds since last keypress before idle timers trigger. /// Used for autocompletion, set to 0 for instant. Defaults to 250ms. #[serde( serialize_with = "serialize_duration_millis", deserialize_with = "deserialize_duration_millis" )] pub idle_timeout: Duration, /// Whether to insert the completion suggestion on hover. Defaults to true. pub preview_completion_insert: bool, pub completion_trigger_len: u8, /// Whether to instruct the LSP to replace the entire word when applying a completion /// or to only insert new text pub completion_replace: bool, /// Whether to display infoboxes. Defaults to true. pub auto_info: bool, pub file_picker: FilePickerConfig, /// Configuration of the statusline elements pub statusline: StatusLineConfig, /// Shape for cursor in each mode pub cursor_shape: CursorShapeConfig, /// Set to `true` to override automatic detection of terminal truecolor support in the event of a false negative. Defaults to `false`. pub true_color: bool, /// Set to `true` to override automatic detection of terminal undercurl support in the event of a false negative. Defaults to `false`. pub undercurl: bool, /// Search configuration. #[serde(default)] pub search: SearchConfig, pub lsp: LspConfig, pub terminal: Option, /// Column numbers at which to draw the rulers. Defaults to `[]`, meaning no rulers. pub rulers: Vec, #[serde(default)] pub whitespace: WhitespaceConfig, /// Persistently display open buffers along the top pub bufferline: BufferLine, /// Vertical indent width guides. pub indent_guides: IndentGuidesConfig, /// Explorer configuration. pub explorer: ExplorerConfig, /// The initial mode for newly opened editors. Defaults to `"normal"`. pub initial_mode: Mode, /// Whether to color modes with different colors. Defaults to `false`. pub color_modes: bool, /// Whether to render rainbow highlights. Defaults to `false`. pub rainbow_brackets: bool, pub soft_wrap: SoftWrap, /// Workspace specific lsp ceiling dirs pub workspace_lsp_roots: Vec, /// Which line ending to choose for new documents. Defaults to `native`. i.e. `crlf` on Windows, otherwise `lf`. pub default_line_ending: LineEndingConfig, /// Whether to automatically insert a trailing line-ending on write if missing. Defaults to `true`. pub insert_final_newline: bool, /// Enables smart tab pub smart_tab: Option, } #[derive(Debug, Clone, PartialEq, Deserialize, Serialize, Eq, PartialOrd, Ord)] #[serde(rename_all = "kebab-case", default)] pub struct SmartTabConfig { pub enable: bool, pub supersede_menu: bool, } impl Default for SmartTabConfig { fn default() -> Self { SmartTabConfig { enable: true, supersede_menu: false, } } } #[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(default, rename_all = "kebab-case", deny_unknown_fields)] pub struct TerminalConfig { pub command: String, #[serde(default)] #[serde(skip_serializing_if = "Vec::is_empty")] pub args: Vec, } #[cfg(windows)] pub fn get_terminal_provider() -> Option { use crate::env::binary_exists; if binary_exists("wt") { return Some(TerminalConfig { command: "wt".to_string(), args: vec![ "new-tab".to_string(), "--title".to_string(), "DEBUG".to_string(), "cmd".to_string(), "/C".to_string(), ], }); } Some(TerminalConfig { command: "conhost".to_string(), args: vec!["cmd".to_string(), "/C".to_string()], }) } #[cfg(not(any(windows, target_os = "wasm32")))] pub fn get_terminal_provider() -> Option { use crate::env::{binary_exists, env_var_is_set}; if env_var_is_set("TMUX") && binary_exists("tmux") { return Some(TerminalConfig { command: "tmux".to_string(), args: vec!["split-window".to_string()], }); } if env_var_is_set("WEZTERM_UNIX_SOCKET") && binary_exists("wezterm") { return Some(TerminalConfig { command: "wezterm".to_string(), args: vec!["cli".to_string(), "split-pane".to_string()], }); } None } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(default, rename_all = "kebab-case", deny_unknown_fields)] pub struct LspConfig { /// Enables LSP pub enable: bool, /// Display LSP progress messages below statusline pub display_messages: bool, /// Enable automatic pop up of signature help (parameter hints) pub auto_signature_help: bool, /// Display docs under signature help popup pub display_signature_help_docs: bool, /// Display inlay hints pub display_inlay_hints: bool, /// Whether to enable snippet support pub snippets: bool, /// Whether to include declaration in the goto reference query pub goto_reference_include_declaration: bool, } impl Default for LspConfig { fn default() -> Self { Self { enable: true, display_messages: false, auto_signature_help: true, display_signature_help_docs: true, display_inlay_hints: false, snippets: true, goto_reference_include_declaration: true, } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct SearchConfig { /// Smart case: Case insensitive searching unless pattern contains upper case characters. Defaults to true. pub smart_case: bool, /// Whether the search should wrap after depleting the matches. Default to true. pub wrap_around: bool, } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct StatusLineConfig { pub left: Vec, pub center: Vec, pub right: Vec, pub separator: String, pub mode: ModeConfig, } impl Default for StatusLineConfig { fn default() -> Self { use StatusLineElement as E; Self { left: vec![ E::Mode, E::Spinner, E::FileName, E::ReadOnlyIndicator, E::FileModificationIndicator, ], center: vec![], right: vec![ E::Diagnostics, E::Selections, E::Register, E::Position, E::FileEncoding, ], separator: String::from("│"), mode: ModeConfig::default(), } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case", default, deny_unknown_fields)] pub struct ModeConfig { pub normal: String, pub insert: String, pub select: String, } impl Default for ModeConfig { fn default() -> Self { Self { normal: String::from("NOR"), insert: String::from("INS"), select: String::from("SEL"), } } } #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum StatusLineElement { /// The editor mode (Normal, Insert, Visual/Selection) Mode, /// The LSP activity spinner Spinner, /// The file basename (the leaf of the open file's path) FileBaseName, /// The relative file path FileName, // The file modification indicator FileModificationIndicator, /// An indicator that shows `"[readonly]"` when a file cannot be written ReadOnlyIndicator, /// The file encoding FileEncoding, /// The file line endings (CRLF or LF) FileLineEnding, /// The file type (language ID or "text") FileType, /// A summary of the number of errors and warnings Diagnostics, /// A summary of the number of errors and warnings on file and workspace WorkspaceDiagnostics, /// The number of selections (cursors) Selections, /// The number of characters currently in primary selection PrimarySelectionLength, /// The cursor position Position, /// The separator string Separator, /// The cursor position as a percent of the total file PositionPercentage, /// The total line numbers of the current file TotalLineNumbers, /// A single space Spacer, /// Current version control information VersionControl, /// Indicator for selected register Register, } // Cursor shape is read and used on every rendered frame and so needs // to be fast. Therefore we avoid a hashmap and use an enum indexed array. #[derive(Debug, Clone, PartialEq, Eq)] pub struct CursorShapeConfig([CursorKind; 3]); impl CursorShapeConfig { pub fn from_mode(&self, mode: Mode) -> CursorKind { self.get(mode as usize).copied().unwrap_or_default() } } impl<'de> Deserialize<'de> for CursorShapeConfig { fn deserialize(deserializer: D) -> Result where D: Deserializer<'de>, { let m = HashMap::::deserialize(deserializer)?; let into_cursor = |mode: Mode| m.get(&mode).copied().unwrap_or_default(); Ok(CursorShapeConfig([ into_cursor(Mode::Normal), into_cursor(Mode::Select), into_cursor(Mode::Insert), ])) } } impl Serialize for CursorShapeConfig { fn serialize(&self, serializer: S) -> Result where S: serde::Serializer, { let mut map = serializer.serialize_map(Some(self.len()))?; let modes = [Mode::Normal, Mode::Select, Mode::Insert]; for mode in modes { map.serialize_entry(&mode, &self.from_mode(mode))?; } map.end() } } impl std::ops::Deref for CursorShapeConfig { type Target = [CursorKind; 3]; fn deref(&self) -> &Self::Target { &self.0 } } impl Default for CursorShapeConfig { fn default() -> Self { Self([CursorKind::Block; 3]) } } /// bufferline render modes #[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum BufferLine { /// Don't render bufferline #[default] Never, /// Always render Always, /// Only if multiple buffers are open Multiple, } #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum LineNumber { /// Show absolute line number Absolute, /// If focused and in normal/select mode, show relative line number to the primary cursor. /// If unfocused or in insert mode, show absolute line number. Relative, } impl std::str::FromStr for LineNumber { type Err = anyhow::Error; fn from_str(s: &str) -> Result { match s.to_lowercase().as_str() { "absolute" | "abs" => Ok(Self::Absolute), "relative" | "rel" => Ok(Self::Relative), _ => anyhow::bail!("Line number can only be `absolute` or `relative`."), } } } #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum GutterType { /// Show diagnostics and other features like breakpoints Diagnostics, /// Show line numbers LineNumbers, /// Show one blank space Spacer, /// Highlight local changes Diff, } impl std::str::FromStr for GutterType { type Err = anyhow::Error; fn from_str(s: &str) -> Result { match s.to_lowercase().as_str() { "diagnostics" => Ok(Self::Diagnostics), "spacer" => Ok(Self::Spacer), "line-numbers" => Ok(Self::LineNumbers), "diff" => Ok(Self::Diff), _ => anyhow::bail!( "Gutter type can only be `diagnostics`, `spacer`, `line-numbers` or `diff`." ), } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(default)] pub struct WhitespaceConfig { pub render: WhitespaceRender, pub characters: WhitespaceCharacters, } impl Default for WhitespaceConfig { fn default() -> Self { Self { render: WhitespaceRender::Basic(WhitespaceRenderValue::None), characters: WhitespaceCharacters::default(), } } } #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(untagged, rename_all = "kebab-case")] pub enum WhitespaceRender { Basic(WhitespaceRenderValue), Specific { default: Option, space: Option, nbsp: Option, tab: Option, newline: Option, }, } #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum WhitespaceRenderValue { None, // TODO // Selection, All, } impl WhitespaceRender { pub fn space(&self) -> WhitespaceRenderValue { match *self { Self::Basic(val) => val, Self::Specific { default, space, .. } => { space.or(default).unwrap_or(WhitespaceRenderValue::None) } } } pub fn nbsp(&self) -> WhitespaceRenderValue { match *self { Self::Basic(val) => val, Self::Specific { default, nbsp, .. } => { nbsp.or(default).unwrap_or(WhitespaceRenderValue::None) } } } pub fn tab(&self) -> WhitespaceRenderValue { match *self { Self::Basic(val) => val, Self::Specific { default, tab, .. } => { tab.or(default).unwrap_or(WhitespaceRenderValue::None) } } } pub fn newline(&self) -> WhitespaceRenderValue { match *self { Self::Basic(val) => val, Self::Specific { default, newline, .. } => newline.or(default).unwrap_or(WhitespaceRenderValue::None), } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(default)] pub struct WhitespaceCharacters { pub space: char, pub nbsp: char, pub tab: char, pub tabpad: char, pub newline: char, } impl Default for WhitespaceCharacters { fn default() -> Self { Self { space: '·', // U+00B7 nbsp: '⍽', // U+237D tab: '→', // U+2192 newline: '⏎', // U+23CE tabpad: ' ', } } } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum RainbowIndentOptions { None, Dim, Normal, } #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(default, rename_all = "kebab-case")] pub struct IndentGuidesConfig { pub render: bool, pub character: char, pub skip_levels: u8, pub rainbow_option: RainbowIndentOptions, } impl Default for IndentGuidesConfig { fn default() -> Self { Self { skip_levels: 0, render: false, character: '│', rainbow_option: RainbowIndentOptions::None, } } } /// Line ending configuration. #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(rename_all = "lowercase")] pub enum LineEndingConfig { /// The platform's native line ending. /// /// `crlf` on Windows, otherwise `lf`. Native, /// Line feed. LF, /// Carriage return followed by line feed. Crlf, /// Form feed. #[cfg(feature = "unicode-lines")] FF, /// Carriage return. #[cfg(feature = "unicode-lines")] CR, /// Next line. #[cfg(feature = "unicode-lines")] Nel, } impl Default for LineEndingConfig { fn default() -> Self { LineEndingConfig::Native } } impl From for LineEnding { fn from(line_ending: LineEndingConfig) -> Self { match line_ending { LineEndingConfig::Native => NATIVE_LINE_ENDING, LineEndingConfig::LF => LineEnding::LF, LineEndingConfig::Crlf => LineEnding::Crlf, #[cfg(feature = "unicode-lines")] LineEndingConfig::FF => LineEnding::FF, #[cfg(feature = "unicode-lines")] LineEndingConfig::CR => LineEnding::CR, #[cfg(feature = "unicode-lines")] LineEndingConfig::Nel => LineEnding::Nel, } } } impl Default for Config { fn default() -> Self { Self { scrolloff: 5, scroll_lines: 3, mouse: true, shell: if cfg!(windows) { vec!["cmd".to_owned(), "/C".to_owned()] } else { vec!["sh".to_owned(), "-c".to_owned()] }, line_number: LineNumber::Absolute, cursorline: false, cursorcolumn: false, gutters: GutterConfig::default(), middle_click_paste: true, auto_pairs: AutoPairConfig::default(), auto_completion: true, auto_format: true, auto_save: false, idle_timeout: Duration::from_millis(250), preview_completion_insert: true, completion_trigger_len: 2, auto_info: true, file_picker: FilePickerConfig::default(), statusline: StatusLineConfig::default(), cursor_shape: CursorShapeConfig::default(), true_color: false, undercurl: false, search: SearchConfig::default(), lsp: LspConfig::default(), terminal: get_terminal_provider(), rulers: Vec::new(), whitespace: WhitespaceConfig::default(), bufferline: BufferLine::default(), indent_guides: IndentGuidesConfig::default(), explorer: ExplorerConfig::default(), initial_mode: Mode::Normal, color_modes: false, rainbow_brackets: false, soft_wrap: SoftWrap { enable: Some(false), ..SoftWrap::default() }, text_width: 80, completion_replace: false, workspace_lsp_roots: Vec::new(), default_line_ending: LineEndingConfig::default(), insert_final_newline: true, smart_tab: Some(SmartTabConfig::default()), } } } impl Default for SearchConfig { fn default() -> Self { Self { wrap_around: true, smart_case: true, } } } #[derive(Debug, Clone, Default)] pub struct Breakpoint { pub id: Option, pub verified: bool, pub message: Option, pub line: usize, pub column: Option, pub condition: Option, pub hit_condition: Option, pub log_message: Option, } use futures_util::stream::{Flatten, Once}; pub struct Editor { /// Current editing mode. pub mode: Mode, pub tree: Tree, pub next_document_id: DocumentId, pub documents: BTreeMap, // We Flatten<> to resolve the inner DocumentSavedEventFuture. For that we need a stream of streams, hence the Once<>. // https://stackoverflow.com/a/66875668 pub saves: HashMap>>, pub save_queue: SelectAll>>>, pub write_count: usize, pub count: Option, pub selected_register: Option, pub registers: Registers, pub macro_recording: Option<(char, Vec)>, pub macro_replaying: Vec, pub language_servers: helix_lsp::Registry, pub diagnostics: BTreeMap>, pub diff_providers: DiffProviderRegistry, pub debugger: Option, pub debugger_events: SelectAll>, pub breakpoints: HashMap>, pub syn_loader: Arc, pub theme_loader: Arc, /// last_theme is used for theme previews. We store the current theme here, /// and if previewing is cancelled, we can return to it. pub last_theme: Option, /// The currently applied editor theme. While previewing a theme, the previewed theme /// is set here. pub theme: Theme, /// The primary Selection prior to starting a goto_line_number preview. This is /// restored when the preview is aborted, or added to the jumplist when it is /// confirmed. pub last_selection: Option, pub status_msg: Option<(Cow<'static, str>, Severity)>, pub autoinfo: Option, pub config: Arc>, pub auto_pairs: Option, pub idle_timer: Pin>, redraw_timer: Pin>, last_motion: Option, pub last_completion: Option, pub exit_code: i32, pub config_events: (UnboundedSender, UnboundedReceiver), pub needs_redraw: bool, /// Cached position of the cursor calculated during rendering. /// The content of `cursor_cache` is returned by `Editor::cursor` if /// set to `Some(_)`. The value will be cleared after it's used. /// If `cursor_cache` is `None` then the `Editor::cursor` function will /// calculate the cursor position. /// /// `Some(None)` represents a cursor position outside of the visible area. /// This will just cause `Editor::cursor` to return `None`. /// /// This cache is only a performance optimization to /// avoid calculating the cursor position multiple /// times during rendering and should not be set by other functions. pub cursor_cache: Cell>>, /// When a new completion request is sent to the server old /// unfinished request must be dropped. Each completion /// request is associated with a channel that cancels /// when the channel is dropped. That channel is stored /// here. When a new completion request is sent this /// field is set and any old requests are automatically /// canceled as a result pub completion_request_handle: Option>, } pub type Motion = Box; #[derive(Debug)] pub enum EditorEvent { DocumentSaved(DocumentSavedEventResult), ConfigEvent(ConfigEvent), LanguageServerMessage((usize, Call)), DebuggerEvent(dap::Payload), IdleTimer, Redraw, } #[derive(Debug, Clone)] pub enum ConfigEvent { Refresh, Update(Box), } enum ThemeAction { Set, Preview, } #[derive(Debug, Clone)] pub enum CompleteAction { Applied { trigger_offset: usize, changes: Vec, }, /// A savepoint of the currently selected completion. The savepoint /// MUST be restored before sending any event to the LSP Selected { savepoint: Arc }, } #[derive(Debug, Copy, Clone)] pub enum Action { Load, Replace, HorizontalSplit, VerticalSplit, } impl Action { /// Whether to align the view to the cursor after executing this action pub fn align_view(&self, view: &View, new_doc: DocumentId) -> bool { !matches!((self, view.doc == new_doc), (Action::Load, false)) } } /// Error thrown on failed document closed pub enum CloseError { /// Document doesn't exist DoesNotExist, /// Buffer is modified BufferModified(String), /// Document failed to save SaveError(anyhow::Error), } impl From for anyhow::Error { fn from(error: CloseError) -> Self { match error { CloseError::DoesNotExist => anyhow::anyhow!("Document doesn't exist"), CloseError::BufferModified(error) => { anyhow::anyhow!(format!("Buffer modified: '{error}'")) } CloseError::SaveError(error) => anyhow::anyhow!(format!("Save error: {error}")), } } } impl Editor { pub fn new( mut area: Rect, theme_loader: Arc, syn_loader: Arc, config: Arc>, ) -> Self { let language_servers = helix_lsp::Registry::new(syn_loader.clone()); let conf = config.load(); let auto_pairs = (&conf.auto_pairs).into(); // HAXX: offset the render area height by 1 to account for prompt/commandline area.height -= 1; Self { mode: Mode::Normal, tree: Tree::new(area), next_document_id: DocumentId::default(), documents: BTreeMap::new(), saves: HashMap::new(), save_queue: SelectAll::new(), write_count: 0, count: None, selected_register: None, macro_recording: None, macro_replaying: Vec::new(), theme: theme_loader.default(), language_servers, diagnostics: BTreeMap::new(), diff_providers: DiffProviderRegistry::default(), debugger: None, debugger_events: SelectAll::new(), breakpoints: HashMap::new(), syn_loader, theme_loader, last_theme: None, last_selection: None, registers: Registers::default(), status_msg: None, autoinfo: None, idle_timer: Box::pin(sleep(conf.idle_timeout)), redraw_timer: Box::pin(sleep(Duration::MAX)), last_motion: None, last_completion: None, config, auto_pairs, exit_code: 0, config_events: unbounded_channel(), needs_redraw: false, cursor_cache: Cell::new(None), completion_request_handle: None, } } pub fn apply_motion(&mut self, motion: F) { motion(self); self.last_motion = Some(Box::new(motion)); } pub fn repeat_last_motion(&mut self, count: usize) { if let Some(motion) = self.last_motion.take() { for _ in 0..count { motion(self); } self.last_motion = Some(motion); } } /// Current editing mode for the [`Editor`]. pub fn mode(&self) -> Mode { self.mode } pub fn config(&self) -> DynGuard { self.config.load() } /// Call if the config has changed to let the editor update all /// relevant members. pub fn refresh_config(&mut self) { let config = self.config(); self.auto_pairs = (&config.auto_pairs).into(); self.reset_idle_timer(); self._refresh(); } pub fn clear_idle_timer(&mut self) { // equivalent to internal Instant::far_future() (30 years) self.idle_timer .as_mut() .reset(Instant::now() + Duration::from_secs(86400 * 365 * 30)); } pub fn reset_idle_timer(&mut self) { let config = self.config(); self.idle_timer .as_mut() .reset(Instant::now() + config.idle_timeout); } pub fn clear_status(&mut self) { self.status_msg = None; } #[inline] pub fn set_status>>(&mut self, status: T) { let status = status.into(); log::debug!("editor status: {}", status); self.status_msg = Some((status, Severity::Info)); } #[inline] pub fn set_error>>(&mut self, error: T) { let error = error.into(); log::error!("editor error: {}", error); self.status_msg = Some((error, Severity::Error)); } #[inline] pub fn get_status(&self) -> Option<(&Cow<'static, str>, &Severity)> { self.status_msg.as_ref().map(|(status, sev)| (status, sev)) } /// Returns true if the current status is an error #[inline] pub fn is_err(&self) -> bool { self.status_msg .as_ref() .map(|(_, sev)| *sev == Severity::Error) .unwrap_or(false) } pub fn unset_theme_preview(&mut self) { if let Some(last_theme) = self.last_theme.take() { self.set_theme(last_theme); } // None likely occurs when the user types ":theme" and then exits before previewing } pub fn set_theme_preview(&mut self, theme: Theme) { self.set_theme_impl(theme, ThemeAction::Preview); } pub fn set_theme(&mut self, theme: Theme) { self.set_theme_impl(theme, ThemeAction::Set); } fn set_theme_impl(&mut self, theme: Theme, preview: ThemeAction) { // `ui.selection` is the only scope required to be able to render a theme. if theme.find_scope_index_exact("ui.selection").is_none() { self.set_error("Invalid theme: `ui.selection` required"); return; } self.syn_loader.set_scopes(theme.scopes().to_vec()); match preview { ThemeAction::Preview => { let last_theme = std::mem::replace(&mut self.theme, theme); // only insert on first preview: this will be the last theme the user has saved self.last_theme.get_or_insert(last_theme); } ThemeAction::Set => { self.last_theme = None; self.theme = theme; } } self._refresh(); } #[inline] pub fn language_server_by_id(&self, language_server_id: usize) -> Option<&helix_lsp::Client> { self.language_servers.get_by_id(language_server_id) } /// Refreshes the language server for a given document pub fn refresh_language_servers(&mut self, doc_id: DocumentId) { self.launch_language_servers(doc_id) } /// Launch a language server for a given document fn launch_language_servers(&mut self, doc_id: DocumentId) { if !self.config().lsp.enable { return; } // if doc doesn't have a URL it's a scratch buffer, ignore it let Some(doc) = self.documents.get_mut(&doc_id) else { return; }; let Some(doc_url) = doc.url() else { return; }; let (lang, path) = (doc.language.clone(), doc.path().cloned()); let config = doc.config.load(); let root_dirs = &config.workspace_lsp_roots; // store only successfully started language servers let language_servers = lang.as_ref().map_or_else(HashMap::default, |language| { self.language_servers .get(language, path.as_ref(), root_dirs, config.lsp.snippets) .filter_map(|(lang, client)| match client { Ok(client) => Some((lang, client)), Err(err) => { log::error!( "Failed to initialize the language servers for `{}` - `{}` {{ {} }}", language.scope(), lang, err ); None } }) .collect::>() }); if language_servers.is_empty() { return; } let language_id = doc.language_id().map(ToOwned::to_owned).unwrap_or_default(); // only spawn new language servers if the servers aren't the same let doc_language_servers_not_in_registry = doc.language_servers.iter().filter(|(name, doc_ls)| { language_servers .get(*name) .map_or(true, |ls| ls.id() != doc_ls.id()) }); for (_, language_server) in doc_language_servers_not_in_registry { tokio::spawn(language_server.text_document_did_close(doc.identifier())); } let language_servers_not_in_doc = language_servers.iter().filter(|(name, ls)| { doc.language_servers .get(*name) .map_or(true, |doc_ls| ls.id() != doc_ls.id()) }); for (_, language_server) in language_servers_not_in_doc { // TODO: this now races with on_init code if the init happens too quickly tokio::spawn(language_server.text_document_did_open( doc_url.clone(), doc.version(), doc.text(), language_id.clone(), )); } doc.language_servers = language_servers; } fn _refresh(&mut self) { let config = self.config(); // Reset the inlay hints annotations *before* updating the views, that way we ensure they // will disappear during the `.sync_change(doc)` call below. // // We can't simply check this config when rendering because inlay hints are only parts of // the possible annotations, and others could still be active, so we need to selectively // drop the inlay hints. if !config.lsp.display_inlay_hints { for doc in self.documents_mut() { doc.reset_all_inlay_hints(); } } for (view, _) in self.tree.views_mut() { let doc = doc_mut!(self, &view.doc); view.sync_changes(doc); view.gutters = config.gutters.clone(); view.ensure_cursor_in_view(doc, config.scrolloff) } } fn replace_document_in_view(&mut self, current_view: ViewId, doc_id: DocumentId) { let view = self.tree.get_mut(current_view); view.doc = doc_id; view.offset = ViewPosition::default(); let doc = doc_mut!(self, &doc_id); doc.ensure_view_init(view.id); view.sync_changes(doc); doc.mark_as_focused(); align_view(doc, view, Align::Center); } pub fn switch(&mut self, id: DocumentId, action: Action) { use crate::tree::Layout; if !self.documents.contains_key(&id) { log::error!("cannot switch to document that does not exist (anymore)"); return; } // this causes tree.rs to panic upon launch. todo: debug // self.enter_normal_mode(); match action { Action::Replace => { let (view, doc) = current_ref!(self); // If the current view is an empty scratch buffer and is not displayed in any other views, delete it. // Boolean value is determined before the call to `view_mut` because the operation requires a borrow // of `self.tree`, which is mutably borrowed when `view_mut` is called. let remove_empty_scratch = !doc.is_modified() // If the buffer has no path and is not modified, it is an empty scratch buffer. && doc.path().is_none() // If the buffer we are changing to is not this buffer && id != doc.id // Ensure the buffer is not displayed in any other splits. && !self .tree .traverse() .any(|(_, v)| v.doc == doc.id && v.id != view.id); let (view, doc) = current!(self); let view_id = view.id; // Append any outstanding changes to history in the old document. doc.append_changes_to_history(view); if remove_empty_scratch { // Copy `doc.id` into a variable before calling `self.documents.remove`, which requires a mutable // borrow, invalidating direct access to `doc.id`. let id = doc.id; self.documents.remove(&id); // Remove the scratch buffer from any jumplists for (view, _) in self.tree.views_mut() { view.remove_document(&id); } } else { let jump = (view.doc, doc.selection(view.id).clone()); view.jumps.push(jump); // Set last accessed doc if it is a different document if doc.id != id { view.add_to_history(view.doc); // Set last modified doc if modified and last modified doc is different if std::mem::take(&mut doc.modified_since_accessed) && view.last_modified_docs[0] != Some(view.doc) { view.last_modified_docs = [Some(view.doc), view.last_modified_docs[0]]; } } } self.replace_document_in_view(view_id, id); return; } Action::Load => { let view_id = view!(self).id; let doc = doc_mut!(self, &id); doc.ensure_view_init(view_id); doc.mark_as_focused(); return; } Action::HorizontalSplit | Action::VerticalSplit => { // copy the current view, unless there is no view yet let view = self .tree .try_get(self.tree.focus) .filter(|v| id == v.doc) // Different Document .cloned() .unwrap_or_else(|| View::new(id, self.config().gutters.clone())); let view_id = self.tree.split( view, match action { Action::HorizontalSplit => Layout::Horizontal, Action::VerticalSplit => Layout::Vertical, _ => unreachable!(), }, ); // initialize selection for view let doc = doc_mut!(self, &id); doc.ensure_view_init(view_id); doc.mark_as_focused(); } } self._refresh(); } /// Generate an id for a new document and register it. fn new_document(&mut self, mut doc: Document) -> DocumentId { self.mode = self.config().initial_mode; let id = self.next_document_id; // Safety: adding 1 from 1 is fine, probably impossible to reach usize max self.next_document_id = DocumentId(unsafe { NonZeroUsize::new_unchecked(self.next_document_id.0.get() + 1) }); doc.id = id; self.documents.insert(id, doc); let (save_sender, save_receiver) = tokio::sync::mpsc::unbounded_channel(); self.saves.insert(id, save_sender); let stream = UnboundedReceiverStream::new(save_receiver).flatten(); self.save_queue.push(stream); id } fn new_file_from_document(&mut self, action: Action, doc: Document) -> DocumentId { let id = self.new_document(doc); self.switch(id, action); id } pub fn new_file(&mut self, action: Action) -> DocumentId { self.new_file_from_document(action, Document::default(self.config.clone())) } pub fn new_file_from_stdin(&mut self, action: Action) -> Result { let (stdin, encoding, has_bom) = crate::document::read_to_string(&mut stdin(), None)?; let doc = Document::from( helix_core::Rope::default(), Some((encoding, has_bom)), self.config.clone(), ); let doc_id = self.new_file_from_document(action, doc); let doc = doc_mut!(self, &doc_id); let view = view_mut!(self); doc.ensure_view_init(view.id); let transaction = helix_core::Transaction::insert(doc.text(), doc.selection(view.id), stdin.into()) .with_selection(Selection::point(0)); doc.apply(&transaction, view.id); doc.append_changes_to_history(view); Ok(doc_id) } // ??? possible use for integration tests pub fn open(&mut self, path: &Path, action: Action) -> Result { let path = helix_core::path::get_canonicalized_path(path); let id = self.document_by_path(&path).map(|doc| doc.id); let id = if let Some(id) = id { id } else { let mut doc = Document::open( &path, None, Some(self.syn_loader.clone()), self.config.clone(), )?; if let Some(diff_base) = self.diff_providers.get_diff_base(&path) { doc.set_diff_base(diff_base); } doc.set_version_control_head(self.diff_providers.get_current_head_name(&path)); let id = self.new_document(doc); self.launch_language_servers(id); id }; self.switch(id, action); Ok(id) } pub fn close(&mut self, id: ViewId) { // Remove selections for the closed view on all documents. for doc in self.documents_mut() { doc.remove_view(id); } self.tree.remove(id); self._refresh(); } pub fn close_document(&mut self, doc_id: DocumentId, force: bool) -> Result<(), CloseError> { let doc = match self.documents.get_mut(&doc_id) { Some(doc) => doc, None => return Err(CloseError::DoesNotExist), }; if !force && doc.is_modified() { return Err(CloseError::BufferModified(doc.display_name().into_owned())); } // This will also disallow any follow-up writes self.saves.remove(&doc_id); for language_server in doc.language_servers() { // TODO: track error tokio::spawn(language_server.text_document_did_close(doc.identifier())); } enum Action { Close(ViewId), ReplaceDoc(ViewId, DocumentId), } let actions: Vec = self .tree .views_mut() .filter_map(|(view, _focus)| { view.remove_document(&doc_id); if view.doc == doc_id { // something was previously open in the view, switch to previous doc if let Some(prev_doc) = view.docs_access_history.pop() { Some(Action::ReplaceDoc(view.id, prev_doc)) } else { // only the document that is being closed was in the view, close it Some(Action::Close(view.id)) } } else { None } }) .collect(); for action in actions { match action { Action::Close(view_id) => { self.close(view_id); } Action::ReplaceDoc(view_id, doc_id) => { self.replace_document_in_view(view_id, doc_id); } } } self.documents.remove(&doc_id); // If the document we removed was visible in all views, we will have no more views. We don't // want to close the editor just for a simple buffer close, so we need to create a new view // containing either an existing document, or a brand new document. if self.tree.views().next().is_none() { let doc_id = self .documents .iter() .map(|(&doc_id, _)| doc_id) .next() .unwrap_or_else(|| self.new_document(Document::default(self.config.clone()))); let view = View::new(doc_id, self.config().gutters.clone()); let view_id = self.tree.insert(view); let doc = doc_mut!(self, &doc_id); doc.ensure_view_init(view_id); doc.mark_as_focused(); } self._refresh(); Ok(()) } pub fn save>( &mut self, doc_id: DocumentId, path: Option

, force: bool, ) -> anyhow::Result<()> { // convert a channel of futures to pipe into main queue one by one // via stream.then() ? then push into main future let path = path.map(|path| path.into()); let doc = doc_mut!(self, &doc_id); let doc_save_future = doc.save(path, force)?; // When a file is written to, notify the file event handler. // Note: This can be removed once proper file watching is implemented. let handler = self.language_servers.file_event_handler.clone(); let future = async move { let res = doc_save_future.await; if let Ok(event) = &res { handler.file_changed(event.path.clone()); } res }; use futures_util::stream; self.saves .get(&doc_id) .ok_or_else(|| anyhow::format_err!("saves are closed for this document!"))? .send(stream::once(Box::pin(future))) .map_err(|err| anyhow!("failed to send save event: {}", err))?; self.write_count += 1; Ok(()) } pub fn resize(&mut self, area: Rect) { if self.tree.resize(area) { self._refresh(); }; } pub fn focus(&mut self, view_id: ViewId) { let prev_id = std::mem::replace(&mut self.tree.focus, view_id); // if leaving the view: mode should reset and the cursor should be // within view if prev_id != view_id { self.enter_normal_mode(); self.ensure_cursor_in_view(view_id); // Update jumplist selections with new document changes. for (view, _focused) in self.tree.views_mut() { let doc = doc_mut!(self, &view.doc); view.sync_changes(doc); } } let view = view!(self, view_id); let doc = doc_mut!(self, &view.doc); doc.mark_as_focused(); } pub fn focus_next(&mut self) { self.focus(self.tree.next()); } pub fn focus_prev(&mut self) { self.focus(self.tree.prev()); } pub fn focus_direction(&mut self, direction: tree::Direction) { let current_view = self.tree.focus; if let Some(id) = self.tree.find_split_in_direction(current_view, direction) { self.focus(id) } } pub fn swap_split_in_direction(&mut self, direction: tree::Direction) { self.tree.swap_split_in_direction(direction); } pub fn transpose_view(&mut self) { self.tree.transpose(); } pub fn should_close(&self) -> bool { self.tree.is_empty() } pub fn ensure_cursor_in_view(&mut self, id: ViewId) { let config = self.config(); let view = self.tree.get_mut(id); let doc = &self.documents[&view.doc]; view.ensure_cursor_in_view(doc, config.scrolloff) } #[inline] pub fn document(&self, id: DocumentId) -> Option<&Document> { self.documents.get(&id) } #[inline] pub fn document_mut(&mut self, id: DocumentId) -> Option<&mut Document> { self.documents.get_mut(&id) } #[inline] pub fn documents(&self) -> impl Iterator { self.documents.values() } #[inline] pub fn documents_mut(&mut self) -> impl Iterator { self.documents.values_mut() } pub fn document_by_path>(&self, path: P) -> Option<&Document> { self.documents() .find(|doc| doc.path().map(|p| p == path.as_ref()).unwrap_or(false)) } pub fn document_by_path_mut>(&mut self, path: P) -> Option<&mut Document> { self.documents_mut() .find(|doc| doc.path().map(|p| p == path.as_ref()).unwrap_or(false)) } /// Gets the primary cursor position in screen coordinates, /// or `None` if the primary cursor is not visible on screen. pub fn cursor(&self) -> (Option, CursorKind) { let config = self.config(); let (view, doc) = current_ref!(self); let cursor = doc .selection(view.id) .primary() .cursor(doc.text().slice(..)); let pos = self .cursor_cache .get() .unwrap_or_else(|| view.screen_coords_at_pos(doc, doc.text().slice(..), cursor)); if let Some(mut pos) = pos { let inner = view.inner_area(doc); pos.col += inner.x as usize; pos.row += inner.y as usize; let cursorkind = config.cursor_shape.from_mode(self.mode); (Some(pos), cursorkind) } else { (None, CursorKind::default()) } } /// Closes language servers with timeout. The default timeout is 10000 ms, use /// `timeout` parameter to override this. pub async fn close_language_servers( &self, timeout: Option, ) -> Result<(), tokio::time::error::Elapsed> { // Remove all language servers from the file event handler. // Note: this is non-blocking. for client in self.language_servers.iter_clients() { self.language_servers .file_event_handler .remove_client(client.id()); } tokio::time::timeout( Duration::from_millis(timeout.unwrap_or(3000)), future::join_all( self.language_servers .iter_clients() .map(|client| client.force_shutdown()), ), ) .await .map(|_| ()) } pub async fn wait_event(&mut self) -> EditorEvent { // the loop only runs once or twice and would be better implemented with a recursion + const generic // however due to limitations with async functions that can not be implemented right now loop { tokio::select! { biased; Some(event) = self.save_queue.next() => { self.write_count -= 1; return EditorEvent::DocumentSaved(event) } Some(config_event) = self.config_events.1.recv() => { return EditorEvent::ConfigEvent(config_event) } Some(message) = self.language_servers.incoming.next() => { return EditorEvent::LanguageServerMessage(message) } Some(event) = self.debugger_events.next() => { return EditorEvent::DebuggerEvent(event) } _ = helix_event::redraw_requested() => { if !self.needs_redraw{ self.needs_redraw = true; let timeout = Instant::now() + Duration::from_millis(33); if timeout < self.idle_timer.deadline() && timeout < self.redraw_timer.deadline(){ self.redraw_timer.as_mut().reset(timeout) } } } _ = &mut self.redraw_timer => { self.redraw_timer.as_mut().reset(Instant::now() + Duration::from_secs(86400 * 365 * 30)); return EditorEvent::Redraw } _ = &mut self.idle_timer => { return EditorEvent::IdleTimer } } } } pub async fn flush_writes(&mut self) -> anyhow::Result<()> { while self.write_count > 0 { if let Some(save_event) = self.save_queue.next().await { self.write_count -= 1; let save_event = match save_event { Ok(event) => event, Err(err) => { self.set_error(err.to_string()); bail!(err); } }; let doc = doc_mut!(self, &save_event.doc_id); doc.set_last_saved_revision(save_event.revision); } } Ok(()) } /// Switches the editor into normal mode. pub fn enter_normal_mode(&mut self) { use helix_core::{graphemes, Range}; if self.mode == Mode::Normal { return; } self.mode = Mode::Normal; let (view, doc) = current!(self); try_restore_indent(doc, view); // if leaving append mode, move cursor back by 1 if doc.restore_cursor { let text = doc.text().slice(..); let selection = doc.selection(view.id).clone().transform(|range| { Range::new( range.from(), graphemes::prev_grapheme_boundary(text, range.to()), ) }); doc.set_selection(view.id, selection); doc.restore_cursor = false; } } pub fn current_stack_frame(&self) -> Option<&StackFrame> { self.debugger .as_ref() .and_then(|debugger| debugger.current_stack_frame()) } } fn try_restore_indent(doc: &mut Document, view: &mut View) { use helix_core::{ chars::char_is_whitespace, line_ending::line_end_char_index, Operation, Transaction, }; fn inserted_a_new_blank_line(changes: &[Operation], pos: usize, line_end_pos: usize) -> bool { if let [Operation::Retain(move_pos), Operation::Insert(ref inserted_str), Operation::Retain(_)] = changes { move_pos + inserted_str.len() == pos && inserted_str.starts_with('\n') && inserted_str.chars().skip(1).all(char_is_whitespace) && pos == line_end_pos // ensure no characters exists after current position } else { false } } let doc_changes = doc.changes().changes(); let text = doc.text().slice(..); let range = doc.selection(view.id).primary(); let pos = range.cursor(text); let line_end_pos = line_end_char_index(&text, range.cursor_line(text)); if inserted_a_new_blank_line(doc_changes, pos, line_end_pos) { // Removes tailing whitespaces. let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { let line_start_pos = text.line_to_char(range.cursor_line(text)); (line_start_pos, pos, None) }); doc.apply(&transaction, view.id); } }