use helix_core::{ comment, coords_at_pos, find_first_non_whitespace_char, find_root, graphemes, indent, match_brackets, movement::{self, Direction}, object, pos_at_coords, regex::{self, Regex}, register, search, selection, words, Change, ChangeSet, Position, Range, Rope, RopeSlice, Selection, SmallVec, Tendril, Transaction, }; use helix_view::{ document::Mode, view::{View, PADDING}, Document, DocumentId, Editor, ViewId, }; use helix_lsp::{ lsp, util::{lsp_pos_to_pos, pos_to_lsp_pos, range_to_lsp_range}, OffsetEncoding, }; use crate::{ compositor::{Callback, Component, Compositor}, ui::{self, Completion, Picker, Popup, Prompt, PromptEvent}, }; use crate::application::{LspCallbackWrapper, LspCallbacks}; use futures_util::FutureExt; use std::future::Future; use std::borrow::Cow; use std::path::{Path, PathBuf}; use crossterm::event::{KeyCode, KeyEvent}; use once_cell::sync::Lazy; pub struct Context<'a> { pub register: helix_view::RegisterSelection, pub _count: Option, pub editor: &'a mut Editor, pub callback: Option, pub on_next_key_callback: Option>, pub callbacks: &'a mut LspCallbacks, } impl<'a> Context<'a> { #[inline] pub fn view(&mut self) -> &mut View { self.editor.view_mut() } #[inline] pub fn doc(&mut self) -> &mut Document { let id = self.editor.view().doc; &mut self.editor.documents[id] } #[inline] pub fn current(&mut self) -> (&mut View, &mut Document) { self.editor.current() } /// Push a new component onto the compositor. pub fn push_layer(&mut self, mut component: Box) { self.callback = Some(Box::new(|compositor: &mut Compositor| { compositor.push(component) })); } #[inline] pub fn on_next_key( &mut self, on_next_key_callback: impl FnOnce(&mut Context, KeyEvent) + 'static, ) { self.on_next_key_callback = Some(Box::new(on_next_key_callback)); } #[inline] pub fn callback( &mut self, call: impl Future> + 'static + Send, callback: F, ) where T: for<'de> serde::Deserialize<'de> + Send + 'static, F: FnOnce(&mut Editor, &mut Compositor, T) + Send + 'static, { let callback = Box::pin(async move { let json = call.await?; let response = serde_json::from_value(json)?; let call: LspCallbackWrapper = Box::new(move |editor: &mut Editor, compositor: &mut Compositor| { callback(editor, compositor, response) }); Ok(call) }); self.callbacks.push(callback); } #[inline] pub fn count(&self) -> usize { self._count.map_or(1, |v| v.get()) } } enum Align { Top, Center, Bottom, } fn align_view(doc: &Document, view: &mut View, align: Align) { let pos = doc.selection(view.id).cursor(); let line = doc.text().char_to_line(pos); let relative = match align { Align::Center => view.area.height as usize / 2, Align::Top => 0, Align::Bottom => view.area.height as usize, }; view.first_line = line.saturating_sub(relative); } /// A command is a function that takes the current state and a count, and does a side-effect on the /// state (usually by creating and applying a transaction). pub type Command = fn(cx: &mut Context); pub fn move_char_left(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_horizontally( text, range, Direction::Backward, count, false, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn move_char_right(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_horizontally( text, range, Direction::Forward, count, false, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn move_line_up(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_vertically( text, range, Direction::Backward, count, false, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn move_line_down(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_vertically( text, range, Direction::Forward, count, false, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn move_line_end(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line = text.char_to_line(range.head); // Line end is pos at the start of next line - 1 // subtract another 1 because the line ends with \n let pos = text.line_to_char(line + 1).saturating_sub(2); Range::new(pos, pos) }); doc.set_selection(view.id, selection); } pub fn move_line_start(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line = text.char_to_line(range.head); // adjust to start of the line let pos = text.line_to_char(line); Range::new(pos, pos) }); doc.set_selection(view.id, selection); } pub fn move_first_nonwhitespace(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line_idx = text.char_to_line(range.head); if let Some(pos) = find_first_non_whitespace_char(text.line(line_idx)) { let pos = pos + text.line_to_char(line_idx); Range::new(pos, pos) } else { range } }); doc.set_selection(view.id, selection); } // TODO: move vs extend could take an extra type Extend/Move that would // Range::new(if Move { pos } if Extend { range.anchor }, pos) // since these all really do the same thing pub fn move_next_word_start(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_next_word_start(text, range.head, count).unwrap_or(range) }); doc.set_selection(view.id, selection); } pub fn move_prev_word_start(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_prev_word_start(text, range.head, count).unwrap_or(range) }); doc.set_selection(view.id, selection); } pub fn move_next_word_end(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc .selection(view.id) .transform(|range| movement::move_next_word_end(text, range.head, count).unwrap_or(range)); doc.set_selection(view.id, selection); } pub fn move_file_start(cx: &mut Context) { push_jump(cx.editor); let (view, doc) = cx.current(); doc.set_selection(view.id, Selection::point(0)); } pub fn move_file_end(cx: &mut Context) { push_jump(cx.editor); let (view, doc) = cx.current(); let text = doc.text(); let last_line = text.line_to_char(text.len_lines().saturating_sub(2)); doc.set_selection(view.id, Selection::point(last_line)); } pub fn extend_next_word_start(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|mut range| { let word = movement::move_next_word_start(text, range.head, count).unwrap_or(range); let pos = word.head; Range::new(range.anchor, pos) }); doc.set_selection(view.id, selection); } pub fn extend_prev_word_start(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|mut range| { let word = movement::move_prev_word_start(text, range.head, count).unwrap_or(range); let pos = word.head; Range::new(range.anchor, pos) }); doc.set_selection(view.id, selection); } pub fn extend_next_word_end(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|mut range| { let word = movement::move_next_word_end(text, range.head, count).unwrap_or(range); let pos = word.head; Range::new(range.anchor, pos) }); doc.set_selection(view.id, selection); } #[inline] fn _find_char(cx: &mut Context, search_fn: F, inclusive: bool, extend: bool) where // TODO: make an options struct for and abstract this Fn into a searcher type // use the definition for w/b/e too F: Fn(RopeSlice, char, usize, usize, bool) -> Option + 'static, { // TODO: count is reset to 1 before next key so we move it into the closure here. // Would be nice to carry over. let count = cx.count(); // need to wait for next key cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|mut range| { search_fn(text, ch, range.head, count, inclusive).map_or(range, |pos| { if extend { Range::new(range.anchor, pos) } else { // select Range::new(range.head, pos) } // or (pos, pos) to move to found val }) }); doc.set_selection(view.id, selection); } }) } pub fn find_till_char(cx: &mut Context) { _find_char( cx, search::find_nth_next, false, /* inclusive */ false, /* extend */ ) } pub fn find_next_char(cx: &mut Context) { _find_char( cx, search::find_nth_next, true, /* inclusive */ false, /* extend */ ) } pub fn extend_till_char(cx: &mut Context) { _find_char( cx, search::find_nth_next, false, /* inclusive */ true, /* extend */ ) } pub fn extend_next_char(cx: &mut Context) { _find_char( cx, search::find_nth_next, true, /* inclusive */ true, /* extend */ ) } pub fn till_prev_char(cx: &mut Context) { _find_char( cx, search::find_nth_prev, false, /* inclusive */ false, /* extend */ ) } pub fn find_prev_char(cx: &mut Context) { _find_char( cx, search::find_nth_prev, true, /* inclusive */ false, /* extend */ ) } pub fn extend_till_prev_char(cx: &mut Context) { _find_char( cx, search::find_nth_prev, false, /* inclusive */ true, /* extend */ ) } pub fn extend_prev_char(cx: &mut Context) { _find_char( cx, search::find_nth_prev, true, /* inclusive */ true, /* extend */ ) } pub fn extend_first_nonwhitespace(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line_idx = text.char_to_line(range.head); if let Some(pos) = find_first_non_whitespace_char(text.line(line_idx)) { let pos = pos + text.line_to_char(line_idx); Range::new(range.anchor, pos) } else { range } }); doc.set_selection(view.id, selection); } pub fn replace(cx: &mut Context) { // need to wait for next key cx.on_next_key(move |cx, event| { let ch = match event { KeyEvent { code: KeyCode::Char(ch), .. } => Some(ch), KeyEvent { code: KeyCode::Enter, .. } => Some('\n'), _ => None, }; if let Some(ch) = ch { let (view, doc) = cx.current(); let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { let max_to = doc.text().len_chars().saturating_sub(1); let to = std::cmp::min(max_to, range.to() + 1); let text: String = doc .text() .slice(range.from()..to) .chars() .map(|c| if c == '\n' { '\n' } else { ch }) .collect(); (range.from(), to, Some(text.into())) }); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } }) } fn scroll(cx: &mut Context, offset: usize, direction: Direction) { use Direction::*; let (view, doc) = cx.current(); let cursor = coords_at_pos(doc.text().slice(..), doc.selection(view.id).cursor()); let doc_last_line = doc.text().len_lines() - 1; let last_line = view.last_line(doc); if direction == Backward && view.first_line == 0 || direction == Forward && last_line == doc_last_line { return; } let scrolloff = PADDING.min(view.area.height as usize / 2); // TODO: user pref // cursor visual offset // TODO: only if dragging via mouse? // let cursor_off = cursor.row - view.first_line; view.first_line = match direction { Forward => view.first_line + offset, Backward => view.first_line.saturating_sub(offset), } .min(doc_last_line); // recalculate last line let last_line = view.last_line(doc); // clamp into viewport let line = cursor .row .max(view.first_line + scrolloff) .min(last_line.saturating_sub(scrolloff)); let text = doc.text().slice(..); let pos = pos_at_coords(text, Position::new(line, cursor.col)); // this func will properly truncate to line end // TODO: only manipulate main selection doc.set_selection(view.id, Selection::point(pos)); } pub fn page_up(cx: &mut Context) { let view = cx.view(); let offset = view.area.height as usize; scroll(cx, offset, Direction::Backward); } pub fn page_down(cx: &mut Context) { let view = cx.view(); let offset = view.area.height as usize; scroll(cx, offset, Direction::Forward); } pub fn half_page_up(cx: &mut Context) { let view = cx.view(); let offset = view.area.height as usize / 2; scroll(cx, offset, Direction::Backward); } pub fn half_page_down(cx: &mut Context) { let view = cx.view(); let offset = view.area.height as usize / 2; scroll(cx, offset, Direction::Forward); } pub fn extend_char_left(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_horizontally( text, range, Direction::Backward, count, true, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn extend_char_right(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_horizontally( text, range, Direction::Forward, count, true, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn extend_line_up(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_vertically( text, range, Direction::Backward, count, true, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn extend_line_down(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { movement::move_vertically( text, range, Direction::Forward, count, true, /* extend */ ) }); doc.set_selection(view.id, selection); } pub fn extend_line_end(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line = text.char_to_line(range.head); // Line end is pos at the start of next line - 1 // subtract another 1 because the line ends with \n let pos = text.line_to_char(line + 1).saturating_sub(2); Range::new(range.anchor, pos) }); doc.set_selection(view.id, selection); } pub fn extend_line_start(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line = text.char_to_line(range.head); // adjust to start of the line let pos = text.line_to_char(line); Range::new(range.anchor, pos) }); doc.set_selection(view.id, selection); } pub fn select_all(cx: &mut Context) { let (view, doc) = cx.current(); let end = doc.text().len_chars().saturating_sub(1); doc.set_selection(view.id, Selection::single(0, end)) } pub fn select_regex(cx: &mut Context) { let prompt = ui::regex_prompt(cx, "select:".to_string(), move |view, doc, regex| { let text = doc.text().slice(..); if let Some(selection) = selection::select_on_matches(text, doc.selection(view.id), ®ex) { doc.set_selection(view.id, selection); } }); cx.push_layer(Box::new(prompt)); } pub fn split_selection(cx: &mut Context) { let prompt = ui::regex_prompt(cx, "split:".to_string(), move |view, doc, regex| { let text = doc.text().slice(..); let selection = selection::split_on_matches(text, doc.selection(view.id), ®ex); doc.set_selection(view.id, selection); }); cx.push_layer(Box::new(prompt)); } pub fn split_selection_on_newline(cx: &mut Context) { let (view, doc) = cx.current(); let text = doc.text().slice(..); // only compile the regex once #[allow(clippy::trivial_regex)] static REGEX: Lazy = Lazy::new(|| Regex::new(r"\n").unwrap()); let selection = selection::split_on_matches(text, doc.selection(view.id), ®EX); doc.set_selection(view.id, selection); } // search: searches for the first occurence in file, provides a prompt // search_next: reuses the last search regex and searches for the next match. The next match becomes the main selection. // -> we always search from after the cursor.head // TODO: be able to use selection as search query (*/alt *) // I'd probably collect all the matches right now and store the current index. The cache needs // wiping if input happens. fn _search(doc: &mut Document, view: &mut View, contents: &str, regex: &Regex, extend: bool) { let text = doc.text(); let selection = doc.selection(view.id); let start = text.char_to_byte(selection.cursor()); // use find_at to find the next match after the cursor, loop around the end // Careful, `Regex` uses `bytes` as offsets, not character indices! let mat = regex .find_at(contents, start) .or_else(|| regex.find(contents)); // TODO: message on wraparound if let Some(mat) = mat { let start = text.byte_to_char(mat.start()); let end = text.byte_to_char(mat.end()); if end == 0 { // skip empty matches that don't make sense return; } let head = end - 1; let selection = if extend { selection.clone().push(Range::new(start, head)) } else { Selection::single(start, head) }; // TODO: (first_match, regex) stuff in register? doc.set_selection(view.id, selection); align_view(doc, view, Align::Center); }; } // TODO: use one function for search vs extend pub fn search(cx: &mut Context) { let (view, doc) = cx.current(); // TODO: could probably share with select_on_matches? // HAXX: sadly we can't avoid allocating a single string for the whole buffer since we can't // feed chunks into the regex yet let contents = doc.text().slice(..).to_string(); let view_id = view.id; let prompt = ui::regex_prompt(cx, "search:".to_string(), move |view, doc, regex| { let text = doc.text(); let start = doc.selection(view.id).cursor(); _search(doc, view, &contents, ®ex, false); // TODO: only store on enter (accept), not update register::set('\\', vec![regex.as_str().to_string()]); }); cx.push_layer(Box::new(prompt)); } // can't search next for ""compose"" for some reason pub fn _search_next(cx: &mut Context, extend: bool) { if let Some(query) = register::get('\\') { let query = query.first().unwrap(); let (view, doc) = cx.current(); let contents = doc.text().slice(..).to_string(); let regex = Regex::new(query).unwrap(); _search(doc, view, &contents, ®ex, extend); } } pub fn search_next(cx: &mut Context) { _search_next(cx, false); } pub fn extend_search_next(cx: &mut Context) { _search_next(cx, true); } pub fn search_selection(cx: &mut Context) { let (view, doc) = cx.current(); let contents = doc.text().slice(..); let query = doc.selection(view.id).primary().fragment(contents); let regex = regex::escape(&query); register::set('\\', vec![regex]); search_next(cx); } // TODO: N -> search_prev // need to loop around buffer also and show a message // same for no matches // pub fn select_line(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let pos = doc.selection(view.id).primary(); let text = doc.text(); let line = text.char_to_line(pos.head); let start = text.line_to_char(line); let end = text .line_to_char(std::cmp::min(doc.text().len_lines(), line + count)) .saturating_sub(1); doc.set_selection(view.id, Selection::single(start, end)); } pub fn extend_line(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let pos = doc.selection(view.id).primary(); let text = doc.text(); let line_start = text.char_to_line(pos.anchor); let mut line = text.char_to_line(pos.head); let line_end = text.line_to_char(line + 1).saturating_sub(1); if line_start <= pos.anchor && pos.head == line_end && line != text.len_lines() { line += 1; } let start = text.line_to_char(line_start); let end = text.line_to_char(line + 1).saturating_sub(1); doc.set_selection(view.id, Selection::single(start, end)); } // heuristic: append changes to history after each command, unless we're in insert mode fn _delete_selection(reg: char, doc: &mut Document, view_id: ViewId) { // first yank the selection let values: Vec = doc .selection(view_id) .fragments(doc.text().slice(..)) .map(Cow::into_owned) .collect(); register::set(reg, values); // then delete let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view_id), |range| { let max_to = doc.text().len_chars().saturating_sub(1); let to = std::cmp::min(max_to, range.to() + 1); (range.from(), to, None) }); doc.apply(&transaction, view_id); } pub fn delete_selection(cx: &mut Context) { let reg = cx.register.name(); let (view, doc) = cx.current(); _delete_selection(reg, doc, view.id); doc.append_changes_to_history(view.id); // exit select mode, if currently in select mode exit_select_mode(cx); } pub fn change_selection(cx: &mut Context) { let reg = cx.register.name(); let (view, doc) = cx.current(); _delete_selection(reg, doc, view.id); enter_insert_mode(doc); } pub fn collapse_selection(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc .selection(view.id) .transform(|range| Range::new(range.head, range.head)); doc.set_selection(view.id, selection); } pub fn flip_selections(cx: &mut Context) { let (view, doc) = cx.current(); let selection = doc .selection(view.id) .transform(|range| Range::new(range.head, range.anchor)); doc.set_selection(view.id, selection); } fn enter_insert_mode(doc: &mut Document) { doc.mode = Mode::Insert; } // inserts at the start of each selection pub fn insert_mode(cx: &mut Context) { let (view, doc) = cx.current(); enter_insert_mode(doc); let selection = doc .selection(view.id) .transform(|range| Range::new(range.to(), range.from())); doc.set_selection(view.id, selection); } // inserts at the end of each selection pub fn append_mode(cx: &mut Context) { let (view, doc) = cx.current(); enter_insert_mode(doc); doc.restore_cursor = true; let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { Range::new( range.from(), graphemes::next_grapheme_boundary(text, range.to()), // to() + next char ) }); let end = text.len_chars(); if selection.iter().any(|range| range.head == end) { let transaction = Transaction::change( doc.text(), std::array::IntoIter::new([(end, end, Some(Tendril::from_char('\n')))]), ); doc.apply(&transaction, view.id); } doc.set_selection(view.id, selection); } mod cmd { use super::*; use std::collections::HashMap; use helix_view::editor::Action; use ui::completers::{self, Completer}; #[derive(Clone)] pub struct Command { pub name: &'static str, pub alias: Option<&'static str>, pub doc: &'static str, // params, flags, helper, completer pub fun: fn(&mut Editor, &[&str], PromptEvent), pub completer: Option, } fn quit(editor: &mut Editor, args: &[&str], event: PromptEvent) { // last view and we have unsaved changes if editor.tree.views().count() == 1 { let modified: Vec<_> = editor .documents() .filter(|doc| doc.is_modified()) .map(|doc| { doc.relative_path() .and_then(|path| path.to_str()) .unwrap_or("[scratch]") }) .collect(); if !modified.is_empty() { let err = format!( "{} unsaved buffer(s) remaining: {:?}", modified.len(), modified ); editor.set_error(err); return; } } editor.close(editor.view().id, /* close_buffer */ false); } fn force_quit(editor: &mut Editor, args: &[&str], event: PromptEvent) { editor.close(editor.view().id, /* close_buffer */ false); } fn open(editor: &mut Editor, args: &[&str], event: PromptEvent) { match args.get(0) { Some(path) => { // TODO: handle error editor.open(path.into(), Action::Replace); } None => { editor.set_error("wrong argument count".to_string()); } }; } fn write(editor: &mut Editor, args: &[&str], event: PromptEvent) { let (view, doc) = editor.current(); if let Some(path) = args.get(0) { if let Err(err) = doc.set_path(Path::new(path)) { editor.set_error(format!("invalid filepath: {}", err)); return; }; } if doc.path().is_none() { editor.set_error("cannot write a buffer without a filename".to_string()); return; } doc.format(view.id); // TODO: merge into save tokio::spawn(doc.save()); } fn new_file(editor: &mut Editor, args: &[&str], event: PromptEvent) { editor.new_file(Action::Replace); } fn format(editor: &mut Editor, args: &[&str], event: PromptEvent) { let (view, doc) = editor.current(); doc.format(view.id) } pub const COMMAND_LIST: &[Command] = &[ Command { name: "quit", alias: Some("q"), doc: "Close the current view.", fun: quit, completer: None, }, Command { name: "quit!", alias: Some("q!"), doc: "Close the current view.", fun: force_quit, completer: None, }, Command { name: "open", alias: Some("o"), doc: "Open a file from disk into the current view.", fun: open, completer: Some(completers::filename), }, Command { name: "write", alias: Some("w"), doc: "Write changes to disk. Accepts an optional path (:write some/path.txt)", fun: write, completer: Some(completers::filename), }, Command { name: "new", alias: Some("n"), doc: "Create a new scratch buffer.", fun: new_file, completer: Some(completers::filename), }, Command { name: "format", alias: Some("fmt"), doc: "Format the file using a formatter.", fun: format, completer: None, }, ]; pub static COMMANDS: Lazy> = Lazy::new(|| { let mut map = HashMap::new(); for cmd in COMMAND_LIST { map.insert(cmd.name, cmd); if let Some(alias) = cmd.alias { map.insert(alias, cmd); } } map }); } pub fn command_mode(cx: &mut Context) { // TODO: completion items should have a info section that would get displayed in // a popup above the prompt when items are tabbed over let mut prompt = Prompt::new( ":".to_owned(), |input: &str| { // we use .this over split_whitespace() because we care about empty segments let parts = input.split(' ').collect::>(); // simple heuristic: if there's no just one part, complete command name. // if there's a space, per command completion kicks in. if parts.len() <= 1 { use std::{borrow::Cow, ops::Range}; let end = 0..; cmd::COMMAND_LIST .iter() .filter(|command| command.name.contains(input)) .map(|command| (end.clone(), Cow::Borrowed(command.name))) .collect() } else { let part = parts.last().unwrap(); if let Some(cmd::Command { completer: Some(completer), .. }) = cmd::COMMANDS.get(parts[0]) { completer(part) .into_iter() .map(|(range, file)| { // offset ranges to input let offset = input.len() - part.len(); let range = (range.start + offset)..; (range, file) }) .collect() } else { Vec::new() } } }, // completion move |editor: &mut Editor, input: &str, event: PromptEvent| { use helix_view::editor::Action; if event != PromptEvent::Validate { return; } let parts = input.split_whitespace().collect::>(); if parts.is_empty() { return; } if let Some(cmd) = cmd::COMMANDS.get(parts[0]) { (cmd.fun)(editor, &parts[1..], event); } else { editor.set_error(format!("no such command: '{}'", parts[0])); }; }, ); prompt.doc_fn = Box::new(|input: &str| { let part = input.split(' ').next().unwrap_or_default(); if let Some(cmd::Command { doc, .. }) = cmd::COMMANDS.get(part) { return Some(doc); } None }); cx.push_layer(Box::new(prompt)); } pub fn file_picker(cx: &mut Context) { let root = find_root(None).unwrap_or_else(|| PathBuf::from("./")); let picker = ui::file_picker(root); cx.push_layer(Box::new(picker)); } pub fn buffer_picker(cx: &mut Context) { use std::path::{Path, PathBuf}; let current = cx.editor.view().doc; let picker = Picker::new( cx.editor .documents .iter() .map(|(id, doc)| (id, doc.relative_path().map(Path::to_path_buf))) .collect(), move |(id, path): &(DocumentId, Option)| { // format_fn match path.as_ref().and_then(|path| path.to_str()) { Some(path) => { if *id == current { format!("{} (*)", path).into() } else { path.into() } } None => "[scratch buffer]".into(), } }, |editor: &mut Editor, (id, _path): &(DocumentId, Option), _action| { use helix_view::editor::Action; editor.switch(*id, Action::Replace); }, ); cx.push_layer(Box::new(picker)); } // I inserts at the first nonwhitespace character of each line with a selection pub fn prepend_to_line(cx: &mut Context) { move_first_nonwhitespace(cx); let doc = cx.doc(); enter_insert_mode(doc); } // A inserts at the end of each line with a selection pub fn append_to_line(cx: &mut Context) { let (view, doc) = cx.current(); enter_insert_mode(doc); let selection = doc.selection(view.id).transform(|range| { let text = doc.text(); let line = text.char_to_line(range.head); // we can't use line_to_char(line + 1) - 2 because the last line might not contain \n let pos = (text.line_to_char(line) + text.line(line).len_chars()).saturating_sub(1); Range::new(pos, pos) }); doc.set_selection(view.id, selection); } enum Open { Below, Above, } fn open(cx: &mut Context, open: Open) { let count = cx.count(); let (view, doc) = cx.current(); enter_insert_mode(doc); let text = doc.text().slice(..); let selection = doc.selection(view.id); let mut ranges = SmallVec::with_capacity(selection.len()); let changes: Vec = selection .iter() .map(|range| { let line = text.char_to_line(range.head); let line = match open { // adjust position to the end of the line (next line - 1) Open::Below => line + 1, // adjust position to the end of the previous line (current line - 1) Open::Above => line, }; let index = doc.text().line_to_char(line).saturating_sub(1); // TODO: share logic with insert_newline for indentation let indent_level = indent::suggested_indent_for_pos( doc.language_config(), doc.syntax(), text, index, true, ); let indent = doc.indent_unit().repeat(indent_level); let mut text = String::with_capacity(1 + indent.len()); text.push('\n'); text.push_str(&indent); let text = text.repeat(count); // calculate new selection range let pos = index + text.chars().count(); ranges.push(Range::new(pos, pos)); (index, index, Some(text.into())) }) .collect(); // TODO: count actually inserts "n" new lines and starts editing on all of them. // TODO: append "count" newlines and modify cursors to those lines let selection = Selection::new(ranges, 0); let transaction = Transaction::change(doc.text(), changes.into_iter()).with_selection(selection); doc.apply(&transaction, view.id); } // o inserts a new line after each line with a selection pub fn open_below(cx: &mut Context) { open(cx, Open::Below) } // O inserts a new line before each line with a selection pub fn open_above(cx: &mut Context) { open(cx, Open::Above) } pub fn normal_mode(cx: &mut Context) { let (view, doc) = cx.current(); doc.mode = Mode::Normal; doc.append_changes_to_history(view.id); // if leaving append mode, move cursor back by 1 if doc.restore_cursor { let text = doc.text().slice(..); let selection = doc.selection(view.id).transform(|range| { Range::new( range.from(), graphemes::prev_grapheme_boundary(text, range.to()), ) }); doc.set_selection(view.id, selection); doc.restore_cursor = false; } } // Store a jump on the jumplist. fn push_jump(editor: &mut Editor) { let (view, doc) = editor.current(); let jump = (doc.id(), doc.selection(view.id).clone()); view.jumps.push(jump); } pub fn goto_mode(cx: &mut Context) { if let Some(count) = cx._count { push_jump(cx.editor); let (view, doc) = cx.current(); let line_idx = std::cmp::min(count.get() - 1, doc.text().len_lines().saturating_sub(2)); let pos = doc.text().line_to_char(line_idx); doc.set_selection(view.id, Selection::point(pos)); return; } cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { // TODO: temporarily show GOTO in the mode list match (cx.doc().mode, ch) { (_, 'g') => move_file_start(cx), (_, 'e') => move_file_end(cx), (Mode::Normal, 'h') => move_line_start(cx), (Mode::Normal, 'l') => move_line_end(cx), (Mode::Select, 'h') => extend_line_start(cx), (Mode::Select, 'l') => extend_line_end(cx), (_, 'd') => goto_definition(cx), (_, 'y') => goto_type_definition(cx), (_, 'r') => goto_reference(cx), (_, 'i') => goto_implementation(cx), (Mode::Normal, 's') => move_first_nonwhitespace(cx), (Mode::Select, 's') => extend_first_nonwhitespace(cx), (_, 't') | (_, 'm') | (_, 'b') => { let (view, doc) = cx.current(); let pos = doc.selection(view.id).cursor(); let line = doc.text().char_to_line(pos); let scrolloff = PADDING.min(view.area.height as usize / 2); // TODO: user pref let last_line = view.last_line(doc); let line = match ch { 't' => (view.first_line + scrolloff), 'm' => (view.first_line + (view.area.height as usize / 2)), 'b' => last_line.saturating_sub(scrolloff), _ => unreachable!(), } .min(last_line.saturating_sub(scrolloff)); let pos = doc.text().line_to_char(line); doc.set_selection(view.id, Selection::point(pos)); } _ => (), } } }) } pub fn select_mode(cx: &mut Context) { cx.doc().mode = Mode::Select; } pub fn exit_select_mode(cx: &mut Context) { cx.doc().mode = Mode::Normal; } fn _goto( editor: &mut Editor, compositor: &mut Compositor, locations: Vec, offset_encoding: OffsetEncoding, ) { use helix_view::editor::Action; push_jump(editor); fn jump_to( editor: &mut Editor, location: &lsp::Location, offset_encoding: OffsetEncoding, action: Action, ) { let id = editor .open(PathBuf::from(location.uri.path()), action) .expect("editor.open failed"); let (view, doc) = editor.current(); let definition_pos = location.range.start; // TODO: convert inside server let new_pos = lsp_pos_to_pos(doc.text(), definition_pos, offset_encoding); doc.set_selection(view.id, Selection::point(new_pos)); align_view(doc, view, Align::Center); } match locations.as_slice() { [location] => { jump_to(editor, location, offset_encoding, Action::Replace); } [] => { editor.set_error("No definition found.".to_string()); } _locations => { let mut picker = ui::Picker::new( locations, |location| { let file = location.uri.as_str(); let line = location.range.start.line; format!("{}:{}", file, line).into() }, move |editor: &mut Editor, location, action| { jump_to(editor, location, offset_encoding, action) }, ); compositor.push(Box::new(picker)); } } } pub fn goto_definition(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let offset_encoding = language_server.offset_encoding(); let pos = pos_to_lsp_pos(doc.text(), doc.selection(view.id).cursor(), offset_encoding); // TODO: handle fails let future = language_server.goto_definition(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { let items = match response { Some(lsp::GotoDefinitionResponse::Scalar(location)) => vec![location], Some(lsp::GotoDefinitionResponse::Array(locations)) => locations, Some(lsp::GotoDefinitionResponse::Link(locations)) => locations .into_iter() .map(|location_link| lsp::Location { uri: location_link.target_uri, range: location_link.target_range, }) .collect(), None => Vec::new(), }; _goto(editor, compositor, items, offset_encoding); }, ); } pub fn goto_type_definition(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let offset_encoding = language_server.offset_encoding(); let pos = pos_to_lsp_pos(doc.text(), doc.selection(view.id).cursor(), offset_encoding); // TODO: handle fails let future = language_server.goto_type_definition(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { let items = match response { Some(lsp::GotoDefinitionResponse::Scalar(location)) => vec![location], Some(lsp::GotoDefinitionResponse::Array(locations)) => locations, Some(lsp::GotoDefinitionResponse::Link(locations)) => locations .into_iter() .map(|location_link| lsp::Location { uri: location_link.target_uri, range: location_link.target_range, }) .collect(), None => Vec::new(), }; _goto(editor, compositor, items, offset_encoding); }, ); } pub fn goto_implementation(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let offset_encoding = language_server.offset_encoding(); let pos = pos_to_lsp_pos(doc.text(), doc.selection(view.id).cursor(), offset_encoding); // TODO: handle fails let future = language_server.goto_implementation(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { let items = match response { Some(lsp::GotoDefinitionResponse::Scalar(location)) => vec![location], Some(lsp::GotoDefinitionResponse::Array(locations)) => locations, Some(lsp::GotoDefinitionResponse::Link(locations)) => locations .into_iter() .map(|location_link| lsp::Location { uri: location_link.target_uri, range: location_link.target_range, }) .collect(), None => Vec::new(), }; _goto(editor, compositor, items, offset_encoding); }, ); } pub fn goto_reference(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let offset_encoding = language_server.offset_encoding(); let pos = pos_to_lsp_pos(doc.text(), doc.selection(view.id).cursor(), offset_encoding); // TODO: handle fails let future = language_server.goto_reference(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, items: Option>| { _goto( editor, compositor, items.unwrap_or_default(), offset_encoding, ); }, ); } fn goto_pos(editor: &mut Editor, pos: usize) { push_jump(editor); let (view, doc) = editor.current(); doc.set_selection(view.id, Selection::point(pos)); align_view(doc, view, Align::Center); } pub fn goto_first_diag(cx: &mut Context) { let editor = &mut cx.editor; let (view, doc) = editor.current(); let cursor_pos = doc.selection(view.id).cursor(); let diag = if let Some(diag) = doc.diagnostics().first() { diag.range.start } else { return; }; goto_pos(editor, diag); } pub fn goto_last_diag(cx: &mut Context) { let editor = &mut cx.editor; let (view, doc) = editor.current(); let cursor_pos = doc.selection(view.id).cursor(); let diag = if let Some(diag) = doc.diagnostics().last() { diag.range.start } else { return; }; goto_pos(editor, diag); } pub fn goto_next_diag(cx: &mut Context) { let editor = &mut cx.editor; let (view, doc) = editor.current(); let cursor_pos = doc.selection(view.id).cursor(); let diag = if let Some(diag) = doc .diagnostics() .iter() .map(|diag| diag.range.start) .find(|&pos| pos > cursor_pos) { diag } else if let Some(diag) = doc.diagnostics().first() { diag.range.start } else { return; }; goto_pos(editor, diag); } pub fn goto_prev_diag(cx: &mut Context) { let editor = &mut cx.editor; let (view, doc) = editor.current(); let cursor_pos = doc.selection(view.id).cursor(); let diag = if let Some(diag) = doc .diagnostics() .iter() .rev() .map(|diag| diag.range.start) .find(|&pos| pos < cursor_pos) { diag } else if let Some(diag) = doc.diagnostics().last() { diag.range.start } else { return; }; goto_pos(editor, diag); } pub fn signature_help(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let pos = pos_to_lsp_pos( doc.text(), doc.selection(view.id).cursor(), language_server.offset_encoding(), ); // TODO: handle fails let future = language_server.text_document_signature_help(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { if let Some(signature_help) = response { log::info!("{:?}", signature_help); // signatures // active_signature // active_parameter // render as: // signature // ---------- // doc // with active param highlighted } }, ); } // NOTE: Transactions in this module get appended to history when we switch back to normal mode. pub mod insert { use super::*; pub type Hook = fn(&Rope, &Selection, char) -> Option; pub type PostHook = fn(&mut Context, char); fn completion(cx: &mut Context, ch: char) { // if ch matches completion char, trigger completion let doc = cx.doc(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let capabilities = language_server.capabilities(); if let lsp::ServerCapabilities { completion_provider: Some(lsp::CompletionOptions { trigger_characters: Some(triggers), .. }), .. } = capabilities { // TODO: what if trigger is multiple chars long let is_trigger = triggers.iter().any(|trigger| trigger.contains(ch)); if is_trigger { super::completion(cx); } } } fn signature_help(cx: &mut Context, ch: char) { // if ch matches signature_help char, trigger let doc = cx.doc(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let capabilities = language_server.capabilities(); if let lsp::ServerCapabilities { signature_help_provider: Some(lsp::SignatureHelpOptions { trigger_characters: Some(triggers), // TODO: retrigger_characters .. }), .. } = capabilities { // TODO: what if trigger is multiple chars long let is_trigger = triggers.iter().any(|trigger| trigger.contains(ch)); if is_trigger { super::signature_help(cx); } } // SignatureHelp { // signatures: [ // SignatureInformation { // label: "fn open(&mut self, path: PathBuf, action: Action) -> Result", // documentation: None, // parameters: Some( // [ParameterInformation { label: Simple("path: PathBuf"), documentation: None }, // ParameterInformation { label: Simple("action: Action"), documentation: None }] // ), // active_parameter: Some(0) // } // ], // active_signature: None, active_parameter: Some(0) // } } // The default insert hook: simply insert the character #[allow(clippy::unnecessary_wraps)] // need to use Option<> because of the Hook signature fn insert(doc: &Rope, selection: &Selection, ch: char) -> Option { let t = Tendril::from_char(ch); let transaction = Transaction::insert(doc, selection, t); Some(transaction) } use helix_core::auto_pairs; const HOOKS: &[Hook] = &[auto_pairs::hook, insert]; const POST_HOOKS: &[PostHook] = &[completion, signature_help]; pub fn insert_char(cx: &mut Context, c: char) { let (view, doc) = cx.current(); let text = doc.text(); let selection = doc.selection(view.id); // run through insert hooks, stopping on the first one that returns Some(t) for hook in HOOKS { if let Some(transaction) = hook(text, selection, c) { doc.apply(&transaction, view.id); break; } } // TODO: need a post insert hook too for certain triggers (autocomplete, signature help, etc) // this could also generically look at Transaction, but it's a bit annoying to look at // Operation instead of Change. for hook in POST_HOOKS { hook(cx, c); } } pub fn insert_tab(cx: &mut Context) { let (view, doc) = cx.current(); // TODO: round out to nearest indentation level (for example a line with 3 spaces should // indent by one to reach 4 spaces). let indent = Tendril::from(doc.indent_unit()); let transaction = Transaction::insert(doc.text(), doc.selection(view.id), indent); doc.apply(&transaction, view.id); } pub fn insert_newline(cx: &mut Context) { let (view, doc) = cx.current(); let text = doc.text().slice(..); let contents = doc.text(); let selection = doc.selection(view.id); let mut ranges = SmallVec::with_capacity(selection.len()); // TODO: this is annoying, but we need to do it to properly calculate pos after edits let mut offs = 0; let mut transaction = Transaction::change_by_selection(contents, selection, |range| { let pos = range.head; let prev = if pos == 0 { ' ' } else { contents.char(pos - 1) }; let curr = contents.char(pos); // TODO: offset range.head by 1? when calculating? let indent_level = indent::suggested_indent_for_pos( doc.language_config(), doc.syntax(), text, pos.saturating_sub(1), true, ); let indent = doc.indent_unit().repeat(indent_level); let mut text = String::with_capacity(1 + indent.len()); text.push('\n'); text.push_str(&indent); let head = pos + offs + text.chars().count(); // TODO: range replace or extend // range.replace(|range| range.is_empty(), head); -> fn extend if cond true, new head pos // can be used with cx.mode to do replace or extend on most changes ranges.push(Range::new( if range.is_empty() { head } else { range.anchor + offs }, head, )); // if between a bracket pair if helix_core::auto_pairs::PAIRS.contains(&(prev, curr)) { // another newline, indent the end bracket one level less let indent = doc.indent_unit().repeat(indent_level.saturating_sub(1)); text.push('\n'); text.push_str(&indent); } offs += text.chars().count(); (pos, pos, Some(text.into())) }); transaction = transaction.with_selection(Selection::new(ranges, selection.primary_index())); // doc.apply(&transaction, view.id); } // TODO: handle indent-aware delete pub fn delete_char_backward(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { ( graphemes::nth_prev_grapheme_boundary(text, range.head, count), range.head, None, ) }); doc.apply(&transaction, view.id); } pub fn delete_char_forward(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { ( range.head, graphemes::nth_next_grapheme_boundary(text, range.head, count), None, ) }); doc.apply(&transaction, view.id); } pub fn delete_word_backward(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let text = doc.text().slice(..); let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { ( words::nth_prev_word_boundary(text, range.head, count), range.head, None, ) }); doc.apply(&transaction, view.id); } } // Undo / Redo // TODO: each command could simply return a Option, then the higher level handles // storing it? pub fn undo(cx: &mut Context) { let view_id = cx.view().id; cx.doc().undo(view_id); } pub fn redo(cx: &mut Context) { let view_id = cx.view().id; cx.doc().redo(view_id); } // Yank / Paste pub fn yank(cx: &mut Context) { // TODO: should selections be made end inclusive? let (view, doc) = cx.current(); let values: Vec = doc .selection(view.id) .fragments(doc.text().slice(..)) .map(Cow::into_owned) .collect(); let msg = format!( "yanked {} selection(s) to register {}", values.len(), cx.register.name() ); register::set(cx.register.name(), values); cx.editor.set_status(msg) } #[derive(Copy, Clone)] enum Paste { Before, After, } fn _paste(reg: char, doc: &mut Document, view: &View, action: Paste) -> Option { if let Some(values) = register::get(reg) { let repeat = std::iter::repeat( values .last() .map(|value| Tendril::from_slice(value)) .unwrap(), ); // if any of values ends \n it's linewise paste let linewise = values.iter().any(|value| value.ends_with('\n')); let mut values = values.into_iter().map(Tendril::from).chain(repeat); let text = doc.text(); let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { let pos = match (action, linewise) { // paste linewise before (Paste::Before, true) => text.line_to_char(text.char_to_line(range.from())), // paste linewise after (Paste::After, true) => text.line_to_char(text.char_to_line(range.to()) + 1), // paste insert (Paste::Before, false) => range.from(), // paste append (Paste::After, false) => range.to() + 1, }; (pos, pos, Some(values.next().unwrap())) }); return Some(transaction); } None } pub fn replace_with_yanked(cx: &mut Context) { let reg = cx.register.name(); if let Some(values) = register::get(reg) { let (view, doc) = cx.current(); if let Some(yank) = values.first() { let transaction = Transaction::change_by_selection(doc.text(), doc.selection(view.id), |range| { let max_to = doc.text().len_chars().saturating_sub(1); let to = std::cmp::min(max_to, range.to()); (range.from(), to, Some(yank.as_str().into())) }); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } } } // alt-p => paste every yanked selection after selected text // alt-P => paste every yanked selection before selected text // R => replace selected text with yanked text // alt-R => replace selected text with every yanked text // // append => insert at next line // insert => insert at start of line // replace => replace // default insert pub fn paste_after(cx: &mut Context) { let reg = cx.register.name(); let (view, doc) = cx.current(); if let Some(transaction) = _paste(reg, doc, view, Paste::After) { doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } } pub fn paste_before(cx: &mut Context) { let reg = cx.register.name(); let (view, doc) = cx.current(); if let Some(transaction) = _paste(reg, doc, view, Paste::Before) { doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } } fn get_lines(doc: &Document, view_id: ViewId) -> Vec { let mut lines = Vec::new(); // Get all line numbers for range in doc.selection(view_id) { let start = doc.text().char_to_line(range.from()); let end = doc.text().char_to_line(range.to()); for line in start..=end { lines.push(line) } } lines.sort_unstable(); // sorting by usize so _unstable is preferred lines.dedup(); lines } pub fn indent(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let lines = get_lines(doc, view.id); // Indent by one level let indent = Tendril::from(doc.indent_unit().repeat(count)); let transaction = Transaction::change( doc.text(), lines.into_iter().map(|line| { let pos = doc.text().line_to_char(line); (pos, pos, Some(indent.clone())) }), ); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } pub fn unindent(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); let lines = get_lines(doc, view.id); let mut changes = Vec::with_capacity(lines.len()); let tab_width = doc.tab_width(); let indent_width = count * tab_width; for line_idx in lines { let line = doc.text().line(line_idx); let mut width = 0; let mut pos = 0; for ch in line.chars() { match ch { ' ' => width += 1, '\t' => width = (width / tab_width + 1) * tab_width, _ => break, } pos += 1; if width >= indent_width { break; } } // now delete from start to first non-blank if pos > 0 { let start = doc.text().line_to_char(line_idx); changes.push((start, start + pos, None)) } } let transaction = Transaction::change(doc.text(), changes.into_iter()); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } pub fn format_selections(cx: &mut Context) { let (view, doc) = cx.current(); // via lsp if available // else via tree-sitter indentation calculations let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let ranges: Vec = doc .selection(view.id) .iter() .map(|range| range_to_lsp_range(doc.text(), *range, language_server.offset_encoding())) .collect(); for range in ranges { let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; // TODO: handle fails // TODO: concurrent map // TODO: need to block to get the formatting // let edits = block_on(language_server.text_document_range_formatting( // doc.identifier(), // range, // lsp::FormattingOptions::default(), // )) // .unwrap_or_default(); // let transaction = helix_lsp::util::generate_transaction_from_edits( // doc.text(), // edits, // language_server.offset_encoding(), // ); // doc.apply(&transaction, view.id); } doc.append_changes_to_history(view.id); } pub fn join_selections(cx: &mut Context) { use movement::skip_over_next; let (view, doc) = cx.current(); let text = doc.text(); let slice = doc.text().slice(..); let mut changes = Vec::new(); let fragment = Tendril::from(" "); for selection in doc.selection(view.id) { let start = text.char_to_line(selection.from()); let mut end = text.char_to_line(selection.to()); if start == end { end += 1 } let lines = start..end; changes.reserve(lines.len()); for line in lines { let mut start = text.line_to_char(line + 1).saturating_sub(1); let mut end = start + 1; skip_over_next(slice, &mut end, |ch| matches!(ch, ' ' | '\t')); // need to skip from start, not end let change = (start, end, Some(fragment.clone())); changes.push(change); } } changes.sort_unstable_by_key(|(from, _to, _text)| *from); changes.dedup(); // TODO: joining multiple empty lines should be replaced by a single space. // need to merge change ranges that touch let transaction = Transaction::change(doc.text(), changes.into_iter()); // TODO: select inserted spaces // .with_selection(selection); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } pub fn keep_selections(cx: &mut Context) { // keep selections matching regex let prompt = ui::regex_prompt(cx, "keep:".to_string(), move |view, doc, regex| { let text = doc.text().slice(..); if let Some(selection) = selection::keep_matches(text, doc.selection(view.id), ®ex) { doc.set_selection(view.id, selection); } }); cx.push_layer(Box::new(prompt)); } pub fn keep_primary_selection(cx: &mut Context) { let (view, doc) = cx.current(); let range = doc.selection(view.id).primary(); let selection = Selection::single(range.anchor, range.head); doc.set_selection(view.id, selection); } // pub fn save(cx: &mut Context) { // Spawns an async task to actually do the saving. This way we prevent blocking. // TODO: handle save errors somehow? tokio::spawn(cx.doc().save()); } pub fn completion(cx: &mut Context) { // trigger on trigger char, or if user calls it // (or on word char typing??) // after it's triggered, if response marked is_incomplete, update on every subsequent keypress // // lsp calls are done via a callback: it sends a request and doesn't block. // when we get the response similarly to notification, trigger a call to the completion popup // // language_server.completion(params, |cx: &mut Context, _meta, response| { // // called at response time // // compositor, lookup completion layer // // downcast dyn Component to Completion component // // emit response to completion (completion.complete/handle(response)) // }) // // typing after prompt opens: usually start offset is tracked and everything between // start_offset..cursor is replaced. For our purposes we could keep the start state (doc, // selection) and revert to them before applying. This needs to properly reset changes/history // though... // // company-mode does this by matching the prefix of the completion and removing it. // ignore isIncomplete for now // keep state while typing // the behavior should be, filter the menu based on input // if items returns empty at any point, remove the popup // if backspace past initial offset point, remove the popup // // debounce requests! // // need an idle timeout thing. // https://github.com/company-mode/company-mode/blob/master/company.el#L620-L622 // // "The idle delay in seconds until completion starts automatically. // The prefix still has to satisfy `company-minimum-prefix-length' before that // happens. The value of nil means no idle completion." let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; let offset_encoding = language_server.offset_encoding(); let pos = pos_to_lsp_pos( doc.text(), doc.selection(view.id).cursor(), language_server.offset_encoding(), ); // TODO: handle fails let future = language_server.completion(doc.identifier(), pos); let trigger_offset = doc.selection(view.id).cursor(); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { let items = match response { Some(lsp::CompletionResponse::Array(items)) => items, // TODO: do something with is_incomplete Some(lsp::CompletionResponse::List(lsp::CompletionList { is_incomplete: _is_incomplete, items, })) => items, None => Vec::new(), }; // TODO: if no completion, show some message or something if items.is_empty() { return; } use crate::compositor::AnyComponent; let size = compositor.size(); let ui = compositor .find(std::any::type_name::()) .unwrap(); if let Some(ui) = ui.as_any_mut().downcast_mut::() { ui.set_completion(items, offset_encoding, trigger_offset, size); }; }, ); // TODO: Server error: content modified // // TODO!: when iterating over items, show the docs in popup // // language server client needs to be accessible via a registry of some sort //} } pub fn hover(cx: &mut Context) { let (view, doc) = cx.current(); let language_server = match doc.language_server() { Some(language_server) => language_server, None => return, }; // TODO: factor out a doc.position_identifier() that returns lsp::TextDocumentPositionIdentifier let pos = pos_to_lsp_pos( doc.text(), doc.selection(view.id).cursor(), language_server.offset_encoding(), ); // TODO: handle fails let future = language_server.text_document_hover(doc.identifier(), pos); cx.callback( future, move |editor: &mut Editor, compositor: &mut Compositor, response: Option| { if let Some(hover) = response { // hover.contents / .range <- used for visualizing let contents = match hover.contents { lsp::HoverContents::Scalar(contents) => { // markedstring(string/languagestring to be highlighted) // TODO log::error!("hover contents {:?}", contents); return; } lsp::HoverContents::Array(contents) => { log::error!("hover contents {:?}", contents); return; } // TODO: render markdown lsp::HoverContents::Markup(contents) => contents.value, }; // skip if contents empty let contents = ui::Markdown::new(contents); let mut popup = Popup::new(contents); compositor.push(Box::new(popup)); } }, ); } // comments pub fn toggle_comments(cx: &mut Context) { let (view, doc) = cx.current(); let transaction = comment::toggle_line_comments(doc.text(), doc.selection(view.id)); doc.apply(&transaction, view.id); doc.append_changes_to_history(view.id); } // tree sitter node selection pub fn expand_selection(cx: &mut Context) { let (view, doc) = cx.current(); if let Some(syntax) = doc.syntax() { let text = doc.text().slice(..); let selection = object::expand_selection(syntax, text, doc.selection(view.id)); doc.set_selection(view.id, selection); } } pub fn match_brackets(cx: &mut Context) { let (view, doc) = cx.current(); if let Some(syntax) = doc.syntax() { let pos = doc.selection(view.id).cursor(); if let Some(pos) = match_brackets::find(syntax, doc.text(), pos) { let selection = Selection::point(pos); doc.set_selection(view.id, selection); }; } } // pub fn jump_forward(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); if let Some((id, selection)) = view.jumps.forward(count) { view.doc = *id; let selection = selection.clone(); let (view, doc) = cx.current(); // refetch doc doc.set_selection(view.id, selection); align_view(doc, view, Align::Center); }; } pub fn jump_backward(cx: &mut Context) { let count = cx.count(); let (view, doc) = cx.current(); if let Some((id, selection)) = view.jumps.backward(view.id, doc, count) { view.doc = *id; let selection = selection.clone(); let (view, doc) = cx.current(); // refetch doc doc.set_selection(view.id, selection); align_view(doc, view, Align::Center); }; } pub fn window_mode(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { match ch { 'w' => rotate_view(cx), 'h' => hsplit(cx), 'v' => vsplit(cx), 'q' => wclose(cx), _ => {} } } }) } pub fn rotate_view(cx: &mut Context) { cx.editor.focus_next() } // split helper, clear it later use helix_view::editor::Action; fn split(cx: &mut Context, action: Action) { use helix_view::editor::Action; let (view, doc) = cx.current(); let id = doc.id(); let selection = doc.selection(view.id).clone(); let first_line = view.first_line; cx.editor.switch(id, action); // match the selection in the previous view let (view, doc) = cx.current(); view.first_line = first_line; doc.set_selection(view.id, selection); } pub fn hsplit(cx: &mut Context) { split(cx, Action::HorizontalSplit); } pub fn vsplit(cx: &mut Context) { split(cx, Action::VerticalSplit); } pub fn wclose(cx: &mut Context) { let view_id = cx.view().id; // close current split cx.editor.close(view_id, /* close_buffer */ false); } pub fn select_register(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { cx.editor.register.select(ch); } }) } pub fn space_mode(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { // TODO: temporarily show SPC in the mode list match ch { 'f' => file_picker(cx), 'b' => buffer_picker(cx), 'w' => window_mode(cx), // ' ' => toggle_alternate_buffer(cx), // TODO: temporary since space mode took its old key ' ' => keep_primary_selection(cx), _ => (), } } }) } pub fn view_mode(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { // if lock, call cx again // TODO: temporarily show VIE in the mode list match ch { // center 'z' | 'c' // top | 't' // bottom | 'b' => { let (view, doc) = cx.current(); align_view(doc, view, match ch { 'z' | 'c' => Align::Center, 't' => Align::Top, 'b' => Align::Bottom, _ => unreachable!() }); } 'm' => { let (view, doc) = cx.current(); let pos = doc.selection(view.id).cursor(); let pos = coords_at_pos(doc.text().slice(..), pos); const OFFSET: usize = 7; // gutters view.first_col = pos.col.saturating_sub(((view.area.width as usize).saturating_sub(OFFSET)) / 2); }, 'h' => (), 'j' => scroll(cx, 1, Direction::Forward), 'k' => scroll(cx, 1, Direction::Backward), 'l' => (), _ => (), } } }) } pub fn left_bracket_mode(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { match ch { 'd' => goto_prev_diag(cx), 'D' => goto_first_diag(cx), _ => (), } } }) } pub fn right_bracket_mode(cx: &mut Context) { cx.on_next_key(move |cx, event| { if let KeyEvent { code: KeyCode::Char(ch), .. } = event { match ch { 'd' => goto_next_diag(cx), 'D' => goto_last_diag(cx), _ => (), } } }) }