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helix-plus/helix-term/src/commands.rs

959 lines
28 KiB
Rust

use helix_core::{
graphemes,
indent::TAB_WIDTH,
regex::Regex,
register, selection,
state::{Direction, Granularity, State},
ChangeSet, Range, Selection, Tendril, Transaction,
};
use once_cell::sync::Lazy;
use crate::compositor::Compositor;
use crate::ui::{self, Prompt, PromptEvent};
use helix_view::{
document::Mode,
view::{View, PADDING},
Document, Editor,
};
pub struct Context<'a> {
pub count: usize,
pub editor: &'a mut Editor,
pub executor: &'static smol::Executor<'static>,
pub callback: Option<crate::compositor::Callback>,
}
impl<'a> Context<'a> {
#[inline]
pub fn view(&mut self) -> &mut View {
self.editor.view_mut()
}
#[inline]
pub fn doc(&mut self) -> &mut Document {
&mut self.editor.view_mut().doc
}
}
/// 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 selection =
cx.doc()
.state
.move_selection(Direction::Backward, Granularity::Character, count);
cx.doc().set_selection(selection);
}
pub fn move_char_right(cx: &mut Context) {
let count = cx.count;
let selection =
cx.doc()
.state
.move_selection(Direction::Forward, Granularity::Character, count);
cx.doc().set_selection(selection);
}
pub fn move_line_up(cx: &mut Context) {
let count = cx.count;
let selection = cx
.doc()
.state
.move_selection(Direction::Backward, Granularity::Line, count);
cx.doc().set_selection(selection);
}
pub fn move_line_down(cx: &mut Context) {
let count = cx.count;
let selection = cx
.doc()
.state
.move_selection(Direction::Forward, Granularity::Line, count);
cx.doc().set_selection(selection);
}
pub fn move_line_end(cx: &mut Context) {
let lines = selection_lines(&cx.doc().state);
let positions = lines
.into_iter()
.map(|index| {
// adjust all positions to the end of the line.
// Line end is pos at the start of next line - 1
// subtract another 1 because the line ends with \n
cx.doc().text().line_to_char(index + 1).saturating_sub(2)
})
.map(|pos| Range::new(pos, pos));
let selection = Selection::new(positions.collect(), 0);
cx.doc().set_selection(selection);
}
pub fn move_line_start(cx: &mut Context) {
let lines = selection_lines(&cx.doc().state);
let positions = lines
.into_iter()
.map(|index| {
// adjust all positions to the start of the line.
cx.doc().text().line_to_char(index)
})
.map(|pos| Range::new(pos, pos));
let selection = Selection::new(positions.collect(), 0);
cx.doc().set_selection(selection);
}
pub fn move_next_word_start(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let pos = doc.state.move_pos(
doc.selection().cursor(),
Direction::Forward,
Granularity::Word,
count,
);
doc.set_selection(Selection::point(pos));
}
pub fn move_prev_word_start(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let pos = doc.state.move_pos(
doc.selection().cursor(),
Direction::Backward,
Granularity::Word,
count,
);
doc.set_selection(Selection::point(pos));
}
pub fn move_next_word_end(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let pos = State::move_next_word_end(&doc.text().slice(..), doc.selection().cursor(), count);
doc.set_selection(Selection::point(pos));
}
pub fn move_file_start(cx: &mut Context) {
cx.doc().set_selection(Selection::point(0));
cx.doc().mode = Mode::Normal;
}
pub fn move_file_end(cx: &mut Context) {
let text = &cx.doc().text();
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let last_line = text.line_to_char(text.len_lines().saturating_sub(2));
cx.doc().set_selection(Selection::point(last_line));
cx.doc().mode = Mode::Normal;
}
pub fn extend_next_word_start(cx: &mut Context) {
let count = cx.count;
let selection = cx
.doc()
.state
.extend_selection(Direction::Forward, Granularity::Word, count);
cx.doc().set_selection(selection);
}
pub fn extend_prev_word_start(cx: &mut Context) {
let count = cx.count;
let selection = cx
.doc()
.state
.extend_selection(Direction::Backward, Granularity::Word, count);
cx.doc().set_selection(selection);
}
pub fn check_cursor_in_view(view: &View) -> bool {
let doc = &view.doc;
let cursor = doc.selection().cursor();
let line = doc.text().char_to_line(cursor);
let document_end = view.first_line + view.area.height.saturating_sub(1) as usize;
if (line > document_end.saturating_sub(PADDING)) | (line < view.first_line + PADDING) {
return false;
}
true
}
pub fn page_up(cx: &mut Context) {
let view = cx.view();
if view.first_line < PADDING {
return;
}
view.first_line = view.first_line.saturating_sub(view.area.height as usize);
if !check_cursor_in_view(view) {
let text = view.doc.text();
let pos = text.line_to_char(view.last_line().saturating_sub(PADDING));
view.doc.set_selection(Selection::point(pos));
}
}
pub fn page_down(cx: &mut Context) {
let view = cx.view();
view.first_line += view.area.height as usize + PADDING;
if view.first_line < view.doc.text().len_lines() {
let text = view.doc.text();
let pos = text.line_to_char(view.first_line as usize);
view.doc.set_selection(Selection::point(pos));
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}
}
pub fn half_page_up(cx: &mut Context) {
let view = cx.view();
if view.first_line < PADDING {
return;
}
view.first_line = view
.first_line
.saturating_sub(view.area.height as usize / 2);
if !check_cursor_in_view(view) {
let text = &view.doc.text();
let pos = text.line_to_char(view.last_line() - PADDING);
view.doc.set_selection(Selection::point(pos));
}
}
pub fn half_page_down(cx: &mut Context) {
let view = cx.view();
let lines = view.doc.text().len_lines();
if view.first_line < lines.saturating_sub(view.area.height as usize) {
view.first_line += view.area.height as usize / 2;
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}
if !check_cursor_in_view(view) {
let text = view.doc.text();
let pos = text.line_to_char(view.first_line as usize);
view.doc.set_selection(Selection::point(pos));
}
}
// avoid select by default by having a visual mode switch that makes movements into selects
pub fn extend_char_left(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let selection = doc
.state
.extend_selection(Direction::Backward, Granularity::Character, count);
doc.set_selection(selection);
}
pub fn extend_char_right(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let selection = doc
.state
.extend_selection(Direction::Forward, Granularity::Character, count);
doc.set_selection(selection);
}
pub fn extend_line_up(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let selection = doc
.state
.extend_selection(Direction::Backward, Granularity::Line, count);
doc.set_selection(selection);
}
pub fn extend_line_down(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let selection = doc
.state
.extend_selection(Direction::Forward, Granularity::Line, count);
doc.set_selection(selection);
}
pub fn select_regex(cx: &mut Context) {
let prompt = ui::regex_prompt(cx, "select:".to_string(), |doc, regex| {
let text = &doc.text().slice(..);
let selection = selection::select_on_matches(text, doc.selection(), &regex);
doc.set_selection(selection);
});
cx.callback = Some(Box::new(
move |compositor: &mut Compositor, editor: &mut Editor| {
compositor.push(Box::new(prompt));
},
));
}
pub fn split_selection(cx: &mut Context) {
// TODO: this needs to store initial selection state, revert on esc, confirm on enter
// needs to also call the callback function per input change, not just final time.
// could cheat and put it into completion_fn
//
// kakoune does it like this:
// # save state to register
// {
// # restore state from register
// # if event == abort, return early
// # add to history if enabled
// # update state
// }
let snapshot = cx.doc().state.clone();
let prompt = ui::regex_prompt(cx, "split:".to_string(), |doc, regex| {
let text = &doc.text().slice(..);
let selection = selection::split_on_matches(text, doc.selection(), &regex);
doc.set_selection(selection);
});
cx.callback = Some(Box::new(
move |compositor: &mut Compositor, editor: &mut Editor| {
compositor.push(Box::new(prompt));
},
));
}
pub fn split_selection_on_newline(cx: &mut Context) {
let doc = cx.doc();
let text = &doc.text().slice(..);
// only compile the regex once
#[allow(clippy::trivial_regex)]
static REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"\n").unwrap());
let selection = selection::split_on_matches(text, doc.selection(), &REGEX);
doc.set_selection(selection);
}
pub fn select_line(cx: &mut Context) {
// TODO: count
let pos = cx.doc().selection().primary();
let text = cx.doc().text();
let line = text.char_to_line(pos.head);
let start = text.line_to_char(line);
let end = text.line_to_char(line + 1).saturating_sub(1);
cx.doc().set_selection(Selection::single(start, end));
}
// heuristic: append changes to history after each command, unless we're in insert mode
fn _delete_selection(cx: &mut Context) {
let transaction = Transaction::change_by_selection(&cx.doc().state, |range| {
(range.from(), range.to() + 1, None)
});
cx.doc().apply(&transaction);
}
pub fn delete_selection(cx: &mut Context) {
_delete_selection(cx);
append_changes_to_history(cx);
}
pub fn change_selection(cx: &mut Context) {
_delete_selection(cx);
insert_mode(cx);
}
pub fn collapse_selection(cx: &mut Context) {
let selection = cx
.doc()
.selection()
.transform(|range| Range::new(range.head, range.head));
cx.doc().set_selection(selection);
}
pub fn flip_selections(cx: &mut Context) {
let selection = cx
.doc()
.selection()
.transform(|range| Range::new(range.head, range.anchor));
cx.doc().set_selection(selection);
}
fn enter_insert_mode(cx: &mut Context) {
cx.doc().mode = Mode::Insert;
// TODO: store selection for undo
}
// inserts at the start of each selection
pub fn insert_mode(cx: &mut Context) {
enter_insert_mode(cx);
let selection = cx
.doc()
.selection()
.transform(|range| Range::new(range.to(), range.from()));
cx.doc().set_selection(selection);
}
// inserts at the end of each selection
pub fn append_mode(cx: &mut Context) {
enter_insert_mode(cx);
let doc = cx.doc();
doc.restore_cursor = true;
// TODO: as transaction
let text = &doc.text().slice(..);
let selection = doc.selection().transform(|range| {
// TODO: to() + next char
Range::new(
range.from(),
graphemes::next_grapheme_boundary(text, range.to()),
)
});
doc.set_selection(selection);
}
// TODO: I, A, o and O can share a lot of the primitives.
pub fn command_mode(cx: &mut Context) {
let executor = cx.executor;
cx.callback = Some(Box::new(
move |compositor: &mut Compositor, editor: &mut Editor| {
let prompt = Prompt::new(
":".to_owned(),
|_input: &str| {
// TODO: i need this duplicate list right now to avoid borrow checker issues
let command_list = vec![
"q".to_string(),
"o".to_string(),
"w".to_string(),
// String::from("q"),
// String::from("aaa"),
// String::from("bbb"),
// String::from("ccc"),
// String::from("ddd"),
// String::from("eee"),
// String::from("averylongcommandaverylongcommandaverylongcommandaverylongcommandaverylongcommand"),
// String::from("q"),
// String::from("aaa"),
// String::from("bbb"),
// String::from("ccc"),
// String::from("ddd"),
// String::from("eee"),
// String::from("q"),
// String::from("aaa"),
// String::from("bbb"),
// String::from("ccc"),
// String::from("ddd"),
// String::from("eee"),
// String::from("q"),
// String::from("aaa"),
// String::from("bbb"),
// String::from("ccc"),
// String::from("ddd"),
// String::from("eee"),
// String::from("q"),
// String::from("aaa"),
// String::from("bbb"),
// String::from("ccc"),
// String::from("ddd"),
// String::from("eee"),
];
command_list
.into_iter()
.filter(|command| command.contains(_input))
.collect()
}, // completion
move |editor: &mut Editor, input: &str, event: PromptEvent| {
if event != PromptEvent::Validate {
return;
}
let parts = input.split_ascii_whitespace().collect::<Vec<&str>>();
match *parts.as_slice() {
["q"] => editor.should_close = true,
["o", path] => {
editor.open(path.into(), executor);
}
_ => (),
}
},
);
compositor.push(Box::new(prompt));
},
));
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}
pub fn file_picker(cx: &mut Context) {
let picker = ui::file_picker("./", cx.executor);
cx.callback = Some(Box::new(
|compositor: &mut Compositor, editor: &mut Editor| {
compositor.push(Box::new(picker));
},
));
}
pub fn buffer_picker(cx: &mut Context) {
unimplemented!()
// cx.callback = Some(Box::new(
// |compositor: &mut Compositor, editor: &mut Editor| {
// let picker = ui::buffer_picker(&editor.views, editor.focus);
// compositor.push(Box::new(picker));
// },
// ));
}
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// calculate line numbers for each selection range
fn selection_lines(state: &State) -> Vec<usize> {
let mut lines = state
.selection
.ranges()
.iter()
.map(|range| state.doc.char_to_line(range.head))
.collect::<Vec<_>>();
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lines.sort_unstable(); // sorting by usize so _unstable is preferred
lines.dedup();
lines
}
// I inserts at the start of each line with a selection
pub fn prepend_to_line(cx: &mut Context) {
enter_insert_mode(cx);
move_line_start(cx);
}
// A inserts at the end of each line with a selection
pub fn append_to_line(cx: &mut Context) {
enter_insert_mode(cx);
move_line_end(cx);
}
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// o inserts a new line after each line with a selection
pub fn open_below(cx: &mut Context) {
enter_insert_mode(cx);
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let doc = cx.doc();
let lines = selection_lines(&doc.state);
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let positions: Vec<_> = lines
.into_iter()
.map(|index| {
// adjust all positions to the end of the line/start of the next one.
doc.text().line_to_char(index + 1)
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})
.collect();
let changes = positions.iter().copied().map(|index| {
// TODO: share logic with insert_newline for indentation
let indent_level = helix_core::indent::suggested_indent_for_pos(
doc.syntax.as_ref(),
&doc.state,
index,
true,
);
let indent = " ".repeat(TAB_WIDTH).repeat(indent_level);
let mut text = String::with_capacity(1 + indent.len());
text.push_str(&indent);
text.push('\n');
// TODO: ideally we want to run a hook over the transactions to figure out and reindent all
// \n's as a post-processing step?
// behaviors:
// - on insert mode enter: we add newline + indent and position cursor at the end
// - on 3o/3O: we insert 3 newlines + indents each and position cursors at ends
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// generate changes
(index, index, Some(text.into()))
});
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// 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(
changes
.clone()
.map(|(start, end, text): (usize, usize, Option<Tendril>)| {
let len = text.map(|text| text.len()).unwrap() - 1; // minus newline
let pos = start + len;
Range::new(pos, pos)
})
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.collect(),
0,
);
let transaction = Transaction::change(&doc.state, changes).with_selection(selection);
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doc.apply(&transaction);
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}
// O inserts a new line before each line with a selection
fn append_changes_to_history(cx: &mut Context) {
if cx.doc().changes.is_empty() {
return;
}
// TODO: change -> change -> undo -> change -> change fails, probably old_state needs reset
let new_changeset = ChangeSet::new(cx.doc().text());
let changes = std::mem::replace(&mut cx.doc().changes, new_changeset);
// Instead of doing this messy merge we could always commit, and based on transaction
// annotations either add a new layer or compose into the previous one.
let transaction = Transaction::from(changes).with_selection(cx.doc().selection().clone());
// increment document version
// TODO: needs to happen on undo/redo too
cx.doc().version += 1;
// TODO: trigger lsp/documentDidChange with changes
// HAXX: we need to reconstruct the state as it was before the changes..
let old_state = cx.doc().old_state.take().expect("no old_state available");
// TODO: take transaction by value?
cx.doc().history.commit_revision(&transaction, &old_state);
// TODO: notify LSP of changes
}
pub fn normal_mode(cx: &mut Context) {
cx.doc().mode = Mode::Normal;
append_changes_to_history(cx);
let doc = cx.doc();
// if leaving append mode, move cursor back by 1
if doc.restore_cursor {
let text = &doc.text().slice(..);
let selection = doc.selection().transform(|range| {
Range::new(
range.from(),
graphemes::prev_grapheme_boundary(text, range.to()),
)
});
doc.set_selection(selection);
doc.restore_cursor = false;
}
}
pub fn goto_mode(cx: &mut Context) {
cx.doc().mode = Mode::Goto;
}
// NOTE: Transactions in this module get appended to history when we switch back to normal mode.
pub mod insert {
use super::*;
// TODO: insert means add text just before cursor, on exit we should be on the last letter.
pub fn insert_char(cx: &mut Context, c: char) {
let c = Tendril::from_char(c);
let transaction = Transaction::insert(&cx.doc().state, c);
cx.doc().apply(&transaction);
}
pub fn insert_tab(cx: &mut Context) {
insert_char(cx, '\t');
}
pub fn insert_newline(cx: &mut Context) {
let doc = cx.doc();
let transaction = Transaction::change_by_selection(&doc.state, |range| {
let indent_level = helix_core::indent::suggested_indent_for_pos(
doc.syntax.as_ref(),
&doc.state,
range.head,
true,
);
let indent = " ".repeat(TAB_WIDTH).repeat(indent_level);
let mut text = String::with_capacity(1 + indent.len());
text.push('\n');
text.push_str(&indent);
(range.head, range.head, Some(text.into()))
});
doc.apply(&transaction);
}
// TODO: handle indent-aware delete
pub fn delete_char_backward(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let text = &doc.text().slice(..);
let transaction = Transaction::change_by_selection(&doc.state, |range| {
(
graphemes::nth_prev_grapheme_boundary(text, range.head, count),
range.head,
None,
)
});
doc.apply(&transaction);
}
pub fn delete_char_forward(cx: &mut Context) {
let count = cx.count;
let doc = cx.doc();
let text = &doc.text().slice(..);
let transaction = Transaction::change_by_selection(&doc.state, |range| {
(
range.head,
graphemes::nth_next_grapheme_boundary(text, range.head, count),
None,
)
});
doc.apply(&transaction);
}
}
pub fn insert_char_prompt(prompt: &mut Prompt, c: char) {
prompt.insert_char(c);
}
// Undo / Redo
// TODO: each command could simply return a Option<transaction>, then the higher level handles
// storing it?
pub fn undo(cx: &mut Context) {
cx.doc().undo();
}
pub fn redo(cx: &mut Context) {
cx.doc().redo();
}
// Yank / Paste
pub fn yank(cx: &mut Context) {
// TODO: should selections be made end inclusive?
let doc = cx.doc();
let values = doc
.state
.selection()
.fragments(&doc.text().slice(..))
.map(|cow| cow.into_owned())
.collect();
// TODO: allow specifying reg
let reg = '"';
register::set(reg, values);
}
pub fn paste(cx: &mut Context) {
// TODO: allow specifying reg
let reg = '"';
if let Some(values) = register::get(reg) {
let repeat = std::iter::repeat(
values
.last()
.map(|value| Tendril::from_slice(value))
.unwrap(),
);
// TODO: if any of values ends \n it's linewise paste
//
// p => paste after
// P => paste before
// 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
let linewise = values.iter().any(|value| value.ends_with('\n'));
let mut values = values.into_iter().map(Tendril::from).chain(repeat);
let doc = cx.doc();
let transaction = if linewise {
// paste on the next line
// TODO: can simply take a range + modifier and compute the right pos without ifs
let text = doc.text();
Transaction::change_by_selection(&doc.state, |range| {
let line_end = text.line_to_char(text.char_to_line(range.head) + 1);
(line_end, line_end, Some(values.next().unwrap()))
})
} else {
Transaction::change_by_selection(&doc.state, |range| {
(range.head + 1, range.head + 1, Some(values.next().unwrap()))
})
};
doc.apply(&transaction);
append_changes_to_history(cx);
}
}
fn get_lines(doc: &Document) -> Vec<usize> {
let mut lines = Vec::new();
// Get all line numbers
for range in doc.selection().ranges() {
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();
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lines
}
pub fn indent(cx: &mut Context) {
let doc = cx.doc();
let lines = get_lines(doc);
// Indent by one level
let indent = Tendril::from(" ".repeat(TAB_WIDTH));
let transaction = Transaction::change(
&doc.state,
lines.into_iter().map(|line| {
let pos = doc.text().line_to_char(line);
(pos, pos, Some(indent.clone()))
}),
);
cx.doc().apply(&transaction);
append_changes_to_history(cx);
}
pub fn unindent(cx: &mut Context) {
let doc = cx.doc();
let lines = get_lines(doc);
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let mut changes = Vec::with_capacity(lines.len());
for line_idx in lines {
let line = doc.text().line(line_idx);
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let mut width = 0;
for ch in line.chars() {
match ch {
' ' => width += 1,
'\t' => width = (width / TAB_WIDTH + 1) * TAB_WIDTH,
_ => break,
}
if width >= TAB_WIDTH {
break;
}
}
if width > 0 {
let start = doc.text().line_to_char(line_idx);
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changes.push((start, start + width, None))
}
}
let transaction = Transaction::change(&doc.state, changes.into_iter());
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doc.apply(&transaction);
append_changes_to_history(cx);
}
pub fn indent_selection(_cx: &mut Context) {
// loop over each line and recompute proper indentation
unimplemented!()
}
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//
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?
cx.executor.spawn(cx.doc().save()).detach();
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}
pub fn completion(cx: &mut Context) {
let language_server = cx
.editor
.language_servers
.get("source.rust", &cx.executor)
.unwrap();
use log::info;
let doc = cx.doc();
// TODO: blocking here is not ideal
let pos = helix_lsp::util::pos_to_lsp_pos(&doc.text().slice(..), doc.selection().cursor());
// TODO: handle fails
let res =
smol::block_on(language_server.completion(cx.doc().identifier(), pos)).unwrap_or_default();
// TODO: if no completion, show some message or something
if !res.is_empty() {
let picker = ui::Picker::new(
res,
|item| {
// format_fn
item.label.as_str().into()
// TODO: use item.filter_text for filtering
},
|editor: &mut Editor, item| {
use helix_lsp::{lsp, util};
// determine what to insert: text_edit | insert_text | label
let edit = if let Some(edit) = &item.text_edit {
match edit {
lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
lsp::CompletionTextEdit::InsertAndReplace(item) => {
unimplemented!("completion: insert_and_replace {:?}", item)
}
}
} else {
item.insert_text.as_ref().unwrap_or(&item.label);
unimplemented!();
// lsp::TextEdit::new(); TODO: calculate a TextEdit from insert_text
// and we insert at position.
};
// TODO: merge edit with additional_text_edits
if let Some(additional_edits) = &item.additional_text_edits {
if !additional_edits.is_empty() {
unimplemented!("completion: additional_text_edits: {:?}", additional_edits);
}
}
let doc = &mut editor.view_mut().doc;
let transaction = util::generate_transaction_from_edits(&doc.state, vec![edit]);
doc.apply(&transaction);
// TODO: append_changes_to_history(cx); if not in insert mode?
},
);
cx.callback = Some(Box::new(
move |compositor: &mut Compositor, editor: &mut Editor| {
compositor.push(Box::new(picker));
},
));
// TODO!: when iterating over items, show the docs in popup
// language server client needs to be accessible via a registry of some sort
}
}
// view movements
pub fn next_view(cx: &mut Context) {
cx.editor.tree.focus_next()
}