use helix_core::{merge_toml_values, syntax}; use helix_lsp::{lsp, util::lsp_pos_to_pos, LspProgressMap}; use helix_view::{theme, Editor}; use crate::{args::Args, compositor::Compositor, config::Config, job::Jobs, ui}; use log::{error, warn}; use std::{ io::{stdout, Write}, sync::Arc, time::{Duration, Instant}, }; use anyhow::Error; use crossterm::{ event::{DisableMouseCapture, EnableMouseCapture, Event, EventStream}, execute, terminal, }; #[cfg(not(windows))] use { signal_hook::{consts::signal, low_level}, signal_hook_tokio::Signals, }; #[cfg(windows)] type Signals = futures_util::stream::Empty<()>; pub struct Application { compositor: Compositor, editor: Editor, // TODO should be separate to take only part of the config config: Config, // Currently never read from. Remove the `allow(dead_code)` when // that changes. #[allow(dead_code)] theme_loader: Arc, // Currently never read from. Remove the `allow(dead_code)` when // that changes. #[allow(dead_code)] syn_loader: Arc, signals: Signals, jobs: Jobs, lsp_progress: LspProgressMap, } impl Application { pub fn new(args: Args, mut config: Config) -> Result { use helix_view::editor::Action; let mut compositor = Compositor::new()?; let size = compositor.size(); let conf_dir = helix_core::config_dir(); let theme_loader = std::sync::Arc::new(theme::Loader::new(&conf_dir, &helix_core::runtime_dir())); // load default and user config, and merge both let def_lang_conf: toml::Value = toml::from_slice(include_bytes!("../../languages.toml")) .expect("Could not parse built-in languages.toml, something must be very wrong"); let user_lang_conf: Option = std::fs::read(conf_dir.join("languages.toml")) .ok() .map(|raw| toml::from_slice(&raw).expect("Could not parse user languages.toml")); let lang_conf = match user_lang_conf { Some(value) => merge_toml_values(def_lang_conf, value), None => def_lang_conf, }; let theme = if let Some(theme) = &config.theme { match theme_loader.load(theme) { Ok(theme) => theme, Err(e) => { log::warn!("failed to load theme `{}` - {}", theme, e); theme_loader.default() } } } else { theme_loader.default() }; let syn_loader_conf: helix_core::syntax::Configuration = lang_conf .try_into() .expect("Could not parse merged (built-in + user) languages.toml"); let syn_loader = std::sync::Arc::new(syntax::Loader::new(syn_loader_conf)); let mut editor = Editor::new( size, theme_loader.clone(), syn_loader.clone(), config.editor.clone(), ); let editor_view = Box::new(ui::EditorView::new(std::mem::take(&mut config.keys))); compositor.push(editor_view); if !args.files.is_empty() { let first = &args.files[0]; // we know it's not empty if first.is_dir() { std::env::set_current_dir(&first)?; editor.new_file(Action::VerticalSplit); compositor.push(Box::new(ui::file_picker(first.clone()))); } else { let nr_of_files = args.files.len(); editor.open(first.to_path_buf(), Action::VerticalSplit)?; for file in args.files { if file.is_dir() { return Err(anyhow::anyhow!( "expected a path to file, found a directory. (to open a directory pass it as first argument)" )); } else { editor.open(file.to_path_buf(), Action::Load)?; } } editor.set_status(format!("Loaded {} files.", nr_of_files)); } } else { editor.new_file(Action::VerticalSplit); } editor.set_theme(theme); #[cfg(windows)] let signals = futures_util::stream::empty(); #[cfg(not(windows))] let signals = Signals::new(&[signal::SIGTSTP, signal::SIGCONT])?; let app = Self { compositor, editor, config, theme_loader, syn_loader, signals, jobs: Jobs::new(), lsp_progress: LspProgressMap::new(), }; Ok(app) } fn render(&mut self) { let editor = &mut self.editor; let compositor = &mut self.compositor; let jobs = &mut self.jobs; let mut cx = crate::compositor::Context { editor, jobs, scroll: None, }; compositor.render(&mut cx); } pub async fn event_loop(&mut self) { let mut reader = EventStream::new(); let mut last_render = Instant::now(); let deadline = Duration::from_secs(1) / 60; self.render(); loop { if self.editor.should_close() { self.jobs.finish(); break; } use futures_util::StreamExt; tokio::select! { biased; event = reader.next() => { self.handle_terminal_events(event) } Some(signal) = self.signals.next() => { self.handle_signals(signal).await; } Some((id, call)) = self.editor.language_servers.incoming.next() => { self.handle_language_server_message(call, id).await; // limit render calls for fast language server messages let last = self.editor.language_servers.incoming.is_empty(); if last || last_render.elapsed() > deadline { self.render(); last_render = Instant::now(); } } Some(callback) = self.jobs.futures.next() => { self.jobs.handle_callback(&mut self.editor, &mut self.compositor, callback); self.render(); } Some(callback) = self.jobs.wait_futures.next() => { self.jobs.handle_callback(&mut self.editor, &mut self.compositor, callback); self.render(); } _ = &mut self.editor.idle_timer => { // idle timeout self.editor.clear_idle_timer(); self.handle_idle_timeout(); } } } } #[cfg(windows)] // no signal handling available on windows pub async fn handle_signals(&mut self, _signal: ()) {} #[cfg(not(windows))] pub async fn handle_signals(&mut self, signal: i32) { use helix_view::graphics::Rect; match signal { signal::SIGTSTP => { self.compositor.save_cursor(); self.restore_term().unwrap(); low_level::emulate_default_handler(signal::SIGTSTP).unwrap(); } signal::SIGCONT => { self.claim_term().await.unwrap(); // redraw the terminal let Rect { width, height, .. } = self.compositor.size(); self.compositor.resize(width, height); self.compositor.load_cursor(); self.render(); } _ => unreachable!(), } } pub fn handle_idle_timeout(&mut self) { use crate::commands::{completion, Context}; use helix_view::document::Mode; if doc_mut!(self.editor).mode != Mode::Insert || !self.config.editor.auto_completion { return; } let editor_view = self .compositor .find(std::any::type_name::()) .expect("expected at least one EditorView"); let editor_view = editor_view .as_any_mut() .downcast_mut::() .unwrap(); if editor_view.completion.is_some() { return; } let mut cx = Context { register: None, editor: &mut self.editor, jobs: &mut self.jobs, count: None, callback: None, on_next_key_callback: None, }; completion(&mut cx); self.render(); } pub fn handle_terminal_events(&mut self, event: Option>) { let mut cx = crate::compositor::Context { editor: &mut self.editor, jobs: &mut self.jobs, scroll: None, }; // Handle key events let should_redraw = match event { Some(Ok(Event::Resize(width, height))) => { self.compositor.resize(width, height); self.compositor .handle_event(Event::Resize(width, height), &mut cx) } Some(Ok(event)) => self.compositor.handle_event(event, &mut cx), Some(Err(x)) => panic!("{}", x), None => panic!(), }; if should_redraw && !self.editor.should_close() { self.render(); } } pub async fn handle_language_server_message( &mut self, call: helix_lsp::Call, server_id: usize, ) { use helix_lsp::{Call, MethodCall, Notification}; match call { Call::Notification(helix_lsp::jsonrpc::Notification { method, params, .. }) => { let notification = match Notification::parse(&method, params) { Some(notification) => notification, None => return, }; match notification { Notification::Initialized => { let language_server = match self.editor.language_servers.get_by_id(server_id) { Some(language_server) => language_server, None => { warn!("can't find language server with id `{}`", server_id); return; } }; let docs = self.editor.documents().filter(|doc| { doc.language_server().map(|server| server.id()) == Some(server_id) }); // trigger textDocument/didOpen for docs that are already open for doc in docs { // TODO: extract and share with editor.open let language_id = doc .language() .and_then(|s| s.split('.').last()) // source.rust .map(ToOwned::to_owned) .unwrap_or_default(); tokio::spawn(language_server.text_document_did_open( doc.url().unwrap(), doc.version(), doc.text(), language_id, )); } } Notification::PublishDiagnostics(params) => { let path = params.uri.to_file_path().unwrap(); let doc = self.editor.document_by_path_mut(&path); if let Some(doc) = doc { let text = doc.text(); let diagnostics = params .diagnostics .into_iter() .filter_map(|diagnostic| { use helix_core::{ diagnostic::{Range, Severity::*}, Diagnostic, }; use lsp::DiagnosticSeverity; let language_server = doc.language_server().unwrap(); // TODO: convert inside server let start = if let Some(start) = lsp_pos_to_pos( text, diagnostic.range.start, language_server.offset_encoding(), ) { start } else { log::warn!("lsp position out of bounds - {:?}", diagnostic); return None; }; let end = if let Some(end) = lsp_pos_to_pos( text, diagnostic.range.end, language_server.offset_encoding(), ) { end } else { log::warn!("lsp position out of bounds - {:?}", diagnostic); return None; }; Some(Diagnostic { range: Range { start, end }, line: diagnostic.range.start.line as usize, message: diagnostic.message, severity: diagnostic.severity.map( |severity| match severity { DiagnosticSeverity::Error => Error, DiagnosticSeverity::Warning => Warning, DiagnosticSeverity::Information => Info, DiagnosticSeverity::Hint => Hint, }, ), // code // source }) }) .collect(); doc.set_diagnostics(diagnostics); } } Notification::ShowMessage(params) => { log::warn!("unhandled window/showMessage: {:?}", params); } Notification::LogMessage(params) => { log::info!("window/logMessage: {:?}", params); } Notification::ProgressMessage(params) if !self .compositor .has_component(std::any::type_name::()) => { let editor_view = self .compositor .find(std::any::type_name::()) .expect("expected at least one EditorView"); let editor_view = editor_view .as_any_mut() .downcast_mut::() .unwrap(); let lsp::ProgressParams { token, value } = params; let lsp::ProgressParamsValue::WorkDone(work) = value; let parts = match &work { lsp::WorkDoneProgress::Begin(lsp::WorkDoneProgressBegin { title, message, percentage, .. }) => (Some(title), message, percentage), lsp::WorkDoneProgress::Report(lsp::WorkDoneProgressReport { message, percentage, .. }) => (None, message, percentage), lsp::WorkDoneProgress::End(lsp::WorkDoneProgressEnd { message }) => { if message.is_some() { (None, message, &None) } else { self.lsp_progress.end_progress(server_id, &token); if !self.lsp_progress.is_progressing(server_id) { editor_view.spinners_mut().get_or_create(server_id).stop(); } self.editor.clear_status(); // we want to render to clear any leftover spinners or messages return; } } }; let token_d: &dyn std::fmt::Display = match &token { lsp::NumberOrString::Number(n) => n, lsp::NumberOrString::String(s) => s, }; let status = match parts { (Some(title), Some(message), Some(percentage)) => { format!("[{}] {}% {} - {}", token_d, percentage, title, message) } (Some(title), None, Some(percentage)) => { format!("[{}] {}% {}", token_d, percentage, title) } (Some(title), Some(message), None) => { format!("[{}] {} - {}", token_d, title, message) } (None, Some(message), Some(percentage)) => { format!("[{}] {}% {}", token_d, percentage, message) } (Some(title), None, None) => { format!("[{}] {}", token_d, title) } (None, Some(message), None) => { format!("[{}] {}", token_d, message) } (None, None, Some(percentage)) => { format!("[{}] {}%", token_d, percentage) } (None, None, None) => format!("[{}]", token_d), }; if let lsp::WorkDoneProgress::End(_) = work { self.lsp_progress.end_progress(server_id, &token); if !self.lsp_progress.is_progressing(server_id) { editor_view.spinners_mut().get_or_create(server_id).stop(); } } else { self.lsp_progress.update(server_id, token, work); } if self.config.lsp.display_messages { self.editor.set_status(status); } } Notification::ProgressMessage(_params) => { // do nothing } } } Call::MethodCall(helix_lsp::jsonrpc::MethodCall { method, params, id, .. }) => { let language_server = match self.editor.language_servers.get_by_id(server_id) { Some(language_server) => language_server, None => { warn!("can't find language server with id `{}`", server_id); return; } }; let call = match MethodCall::parse(&method, params) { Some(call) => call, None => { error!("Method not found {}", method); // language_server.reply( // call.id, // // TODO: make a Into trait that can cast to Err(jsonrpc::Error) // Err(helix_lsp::jsonrpc::Error { // code: helix_lsp::jsonrpc::ErrorCode::MethodNotFound, // message: "Method not found".to_string(), // data: None, // }), // ); return; } }; match call { MethodCall::WorkDoneProgressCreate(params) => { self.lsp_progress.create(server_id, params.token); let editor_view = self .compositor .find(std::any::type_name::()) .expect("expected at least one EditorView"); let editor_view = editor_view .as_any_mut() .downcast_mut::() .unwrap(); let spinner = editor_view.spinners_mut().get_or_create(server_id); if spinner.is_stopped() { spinner.start(); } tokio::spawn(language_server.reply(id, Ok(serde_json::Value::Null))); } } } e => unreachable!("{:?}", e), } } async fn claim_term(&mut self) -> Result<(), Error> { terminal::enable_raw_mode()?; let mut stdout = stdout(); execute!(stdout, terminal::EnterAlternateScreen)?; if self.config.editor.mouse { execute!(stdout, EnableMouseCapture)?; } Ok(()) } fn restore_term(&mut self) -> Result<(), Error> { let mut stdout = stdout(); // reset cursor shape write!(stdout, "\x1B[2 q")?; execute!(stdout, DisableMouseCapture)?; execute!(stdout, terminal::LeaveAlternateScreen)?; terminal::disable_raw_mode()?; Ok(()) } pub async fn run(&mut self) -> Result<(), Error> { self.claim_term().await?; // Exit the alternate screen and disable raw mode before panicking let hook = std::panic::take_hook(); std::panic::set_hook(Box::new(move |info| { // We can't handle errors properly inside this closure. And it's // probably not a good idea to `unwrap()` inside a panic handler. // So we just ignore the `Result`s. let _ = execute!(std::io::stdout(), DisableMouseCapture); let _ = execute!(std::io::stdout(), terminal::LeaveAlternateScreen); let _ = terminal::disable_raw_mode(); hook(info); })); self.event_loop().await; if self.editor.close_language_servers(None).await.is_err() { log::error!("Timed out waiting for language servers to shutdown"); }; self.restore_term()?; Ok(()) } }