use crate::{ clipboard::{get_clipboard_provider, ClipboardProvider}, document::SCRATCH_BUFFER_NAME, graphics::{CursorKind, Rect}, theme::{self, Theme}, tree::{self, Tree}, Document, DocumentId, View, ViewId, }; use futures_util::future; use std::{ collections::BTreeMap, io::stdin, num::NonZeroUsize, path::{Path, PathBuf}, pin::Pin, sync::Arc, }; use tokio::time::{sleep, Duration, Instant, Sleep}; use anyhow::{bail, Context, Error}; pub use helix_core::diagnostic::Severity; pub use helix_core::register::Registers; use helix_core::syntax; use helix_core::{Position, Selection}; use serde::Deserialize; fn deserialize_duration_millis<'de, D>(deserializer: D) -> Result where D: serde::Deserializer<'de>, { let millis = u64::deserialize(deserializer)?; Ok(Duration::from_millis(millis)) } #[derive(Debug, Clone, PartialEq, 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 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, parents: true, ignore: true, git_ignore: true, git_global: true, git_exclude: true, max_depth: None, } } } #[derive(Debug, Clone, PartialEq, 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, /// Middle click paste support. Defaults to true. pub middle_click_paste: bool, /// Smart case: Case insensitive searching unless pattern contains upper case characters. Defaults to true. pub smart_case: bool, /// Automatic insertion of pairs to parentheses, brackets, etc. Defaults to true. pub auto_pairs: bool, /// Automatic auto-completion, automatically pop up without user trigger. Defaults to true. pub auto_completion: bool, /// Time in milliseconds since last keypress before idle timers trigger. Used for autocompletion, set to 0 for instant. Defaults to 400ms. #[serde(skip_serializing, deserialize_with = "deserialize_duration_millis")] pub idle_timeout: Duration, pub completion_trigger_len: u8, /// Whether to display infoboxes. Defaults to true. pub auto_info: bool, pub file_picker: FilePickerConfig, } #[derive(Debug, Copy, Clone, PartialEq, Eq, Deserialize)] #[serde(rename_all = "kebab-case")] pub enum LineNumber { /// Show absolute line number Absolute, /// Show relative line number to the primary cursor Relative, } 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, middle_click_paste: true, smart_case: true, auto_pairs: true, auto_completion: true, idle_timeout: Duration::from_millis(400), completion_trigger_len: 2, auto_info: true, file_picker: FilePickerConfig::default(), } } } pub struct Motion(pub Box); impl Motion { pub fn run(&self, e: &mut Editor) { (self.0)(e) } } impl std::fmt::Debug for Motion { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.write_str("motion") } } #[derive(Debug)] pub struct Editor { pub tree: Tree, pub next_document_id: DocumentId, pub documents: BTreeMap, pub count: Option, pub selected_register: Option, pub registers: Registers, pub theme: Theme, pub language_servers: helix_lsp::Registry, pub clipboard_provider: Box, pub syn_loader: Arc, pub theme_loader: Arc, pub status_msg: Option<(String, Severity)>, pub config: Config, pub idle_timer: Pin>, pub last_motion: Option, pub exit_code: i32, } #[derive(Debug, Copy, Clone)] pub enum Action { Load, Replace, HorizontalSplit, VerticalSplit, } impl Editor { pub fn new( mut area: Rect, theme_loader: Arc, syn_loader: Arc, config: Config, ) -> Self { let language_servers = helix_lsp::Registry::new(); // HAXX: offset the render area height by 1 to account for prompt/commandline area.height -= 1; Self { tree: Tree::new(area), next_document_id: DocumentId::default(), documents: BTreeMap::new(), count: None, selected_register: None, theme: theme_loader.default(), language_servers, syn_loader, theme_loader, registers: Registers::default(), clipboard_provider: get_clipboard_provider(), status_msg: None, idle_timer: Box::pin(sleep(config.idle_timeout)), last_motion: None, config, exit_code: 0, } } 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) { self.idle_timer .as_mut() .reset(Instant::now() + self.config.idle_timeout); } pub fn clear_status(&mut self) { self.status_msg = None; } pub fn set_status(&mut self, status: String) { self.status_msg = Some((status, Severity::Info)); } pub fn set_error(&mut self, error: String) { self.status_msg = Some((error, Severity::Error)); } pub fn set_theme(&mut self, theme: Theme) { // `ui.selection` is the only scope required to be able to render a theme. if theme.find_scope_index("ui.selection").is_none() { self.set_error("Invalid theme: `ui.selection` required".to_owned()); return; } let scopes = theme.scopes(); for config in self .syn_loader .language_configs_iter() .filter(|cfg| cfg.is_highlight_initialized()) { config.reconfigure(scopes); } self.theme = theme; self._refresh(); } pub fn set_theme_from_name(&mut self, theme: &str) -> anyhow::Result<()> { let theme = self .theme_loader .load(theme.as_ref()) .with_context(|| format!("failed setting theme `{}`", theme))?; self.set_theme(theme); Ok(()) } /// Refreshes the language server for a given document pub fn refresh_language_server(&mut self, doc_id: DocumentId) -> Option<()> { let doc = self.documents.get_mut(&doc_id)?; doc.detect_language(Some(&self.theme), &self.syn_loader); Self::launch_language_server(&mut self.language_servers, doc) } /// Launch a language server for a given document fn launch_language_server(ls: &mut helix_lsp::Registry, doc: &mut Document) -> Option<()> { // try to find a language server based on the language name let language_server = doc.language.as_ref().and_then(|language| { ls.get(language) .map_err(|e| { log::error!( "Failed to initialize the LSP for `{}` {{ {} }}", language.scope(), e ) }) .ok() }); if let Some(language_server) = language_server { // only spawn a new lang server if the servers aren't the same if Some(language_server.id()) != doc.language_server().map(|server| server.id()) { if let Some(language_server) = doc.language_server() { tokio::spawn(language_server.text_document_did_close(doc.identifier())); } let language_id = doc .language() .and_then(|s| s.split('.').last()) // source.rust .map(ToOwned::to_owned) .unwrap_or_default(); // TODO: this now races with on_init code if the init happens too quickly tokio::spawn(language_server.text_document_did_open( doc.url().unwrap(), doc.version(), doc.text(), language_id, )); doc.set_language_server(Some(language_server)); } } Some(()) } fn _refresh(&mut self) { for (view, _) in self.tree.views_mut() { let doc = &self.documents[&view.doc]; view.ensure_cursor_in_view(doc, self.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 = Position::default(); let doc = self.documents.get_mut(&doc_id).unwrap(); // initialize selection for view doc.selections .entry(view.id) .or_insert_with(|| Selection::point(0)); // TODO: reuse align_view let pos = doc .selection(view.id) .primary() .cursor(doc.text().slice(..)); let line = doc.text().char_to_line(pos); view.offset.row = line.saturating_sub(view.inner_area().height as usize / 2); } 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; } 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 = view_mut!(self); 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); } else { let jump = (view.doc, doc.selection(view.id).clone()); view.jumps.push(jump); view.last_accessed_doc = Some(view.doc); } let view_id = view.id; self.replace_document_in_view(view_id, id); return; } Action::Load => { let view_id = view!(self).id; let doc = self.documents.get_mut(&id).unwrap(); if doc.selections().is_empty() { doc.selections.insert(view_id, Selection::point(0)); } return; } Action::HorizontalSplit | Action::VerticalSplit => { let view = View::new(id); let view_id = self.tree.split( view, match action { Action::HorizontalSplit => Layout::Horizontal, Action::VerticalSplit => Layout::Vertical, _ => unreachable!(), }, ); // initialize selection for view let doc = self.documents.get_mut(&id).unwrap(); doc.selections.insert(view_id, Selection::point(0)); } } self._refresh(); } /// Generate an id for a new document and register it. fn new_document(&mut self, mut doc: Document) -> DocumentId { 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); 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()) } pub fn new_file_from_stdin(&mut self, action: Action) -> Result { let (rope, encoding) = crate::document::from_reader(&mut stdin(), None)?; Ok(self.new_file_from_document(action, Document::from(rope, Some(encoding)))) } pub fn open(&mut self, path: PathBuf, 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.theme), Some(&self.syn_loader))?; let _ = Self::launch_language_server(&mut self.language_servers, &mut doc); self.new_document(doc) }; self.switch(id, action); Ok(id) } pub fn close(&mut self, id: ViewId) { let view = self.tree.get(self.tree.focus); // remove selection self.documents .get_mut(&view.doc) .unwrap() .selections .remove(&id); self.tree.remove(id); self._refresh(); } pub fn close_document(&mut self, doc_id: DocumentId, force: bool) -> anyhow::Result<()> { let doc = match self.documents.get(&doc_id) { Some(doc) => doc, None => bail!("document does not exist"), }; if !force && doc.is_modified() { bail!( "buffer {:?} is modified", doc.relative_path() .map(|path| path.to_string_lossy().to_string()) .unwrap_or_else(|| SCRATCH_BUFFER_NAME.into()) ); } if let Some(language_server) = doc.language_server() { tokio::spawn(language_server.text_document_did_close(doc.identifier())); } let views_to_close = self .tree .views() .filter_map(|(view, _focus)| { if view.doc == doc_id { Some(view.id) } else { None } }) .collect::>(); for view_id in views_to_close { self.close(view_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())); let view = View::new(doc_id); let view_id = self.tree.insert(view); let doc = self.documents.get_mut(&doc_id).unwrap(); doc.selections.insert(view_id, Selection::point(0)); } self._refresh(); Ok(()) } pub fn resize(&mut self, area: Rect) { if self.tree.resize(area) { self._refresh(); }; } pub fn focus_next(&mut self) { self.tree.focus_next(); } pub fn focus_right(&mut self) { self.tree.focus_direction(tree::Direction::Right); } pub fn focus_left(&mut self) { self.tree.focus_direction(tree::Direction::Left); } pub fn focus_up(&mut self) { self.tree.focus_direction(tree::Direction::Up); } pub fn focus_down(&mut self) { self.tree.focus_direction(tree::Direction::Down); } pub fn should_close(&self) -> bool { self.tree.is_empty() } pub fn ensure_cursor_in_view(&mut self, id: ViewId) { let view = self.tree.get_mut(id); let doc = &self.documents[&view.doc]; view.ensure_cursor_in_view(doc, self.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)) } pub fn cursor(&self) -> (Option, CursorKind) { let (view, doc) = current_ref!(self); let cursor = doc .selection(view.id) .primary() .cursor(doc.text().slice(..)); if let Some(mut pos) = view.screen_coords_at_pos(doc, doc.text().slice(..), cursor) { let inner = view.inner_area(); pos.col += inner.x as usize; pos.row += inner.y as usize; (Some(pos), CursorKind::Hidden) } else { (None, CursorKind::Hidden) } } /// Closes language servers with timeout. The default timeout is 500 ms, use /// `timeout` parameter to override this. pub async fn close_language_servers( &self, timeout: Option, ) -> Result<(), tokio::time::error::Elapsed> { tokio::time::timeout( Duration::from_millis(timeout.unwrap_or(500)), future::join_all( self.language_servers .iter_clients() .map(|client| client.force_shutdown()), ), ) .await .map(|_| ()) } }