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helix/helix-term/src/ui/completion.rs

358 lines
14 KiB
Rust

use crate::compositor::{Component, Context, EventResult};
use crossterm::event::{Event, KeyCode, KeyEvent};
use tui::buffer::Buffer as Surface;
use std::borrow::Cow;
use helix_core::Transaction;
use helix_view::{graphics::Rect, Document, Editor};
use crate::commands;
use crate::ui::{menu, Markdown, Menu, Popup, PromptEvent};
use helix_lsp::{lsp, util};
use lsp::CompletionItem;
impl menu::Item for CompletionItem {
fn sort_text(&self) -> &str {
self.filter_text.as_ref().unwrap_or(&self.label).as_str()
}
fn filter_text(&self) -> &str {
self.filter_text.as_ref().unwrap_or(&self.label).as_str()
}
fn label(&self) -> &str {
self.label.as_str()
}
fn row(&self) -> menu::Row {
menu::Row::new(vec![
menu::Cell::from(self.label.as_str()),
menu::Cell::from(match self.kind {
Some(lsp::CompletionItemKind::TEXT) => "text",
Some(lsp::CompletionItemKind::METHOD) => "method",
Some(lsp::CompletionItemKind::FUNCTION) => "function",
Some(lsp::CompletionItemKind::CONSTRUCTOR) => "constructor",
Some(lsp::CompletionItemKind::FIELD) => "field",
Some(lsp::CompletionItemKind::VARIABLE) => "variable",
Some(lsp::CompletionItemKind::CLASS) => "class",
Some(lsp::CompletionItemKind::INTERFACE) => "interface",
Some(lsp::CompletionItemKind::MODULE) => "module",
Some(lsp::CompletionItemKind::PROPERTY) => "property",
Some(lsp::CompletionItemKind::UNIT) => "unit",
Some(lsp::CompletionItemKind::VALUE) => "value",
Some(lsp::CompletionItemKind::ENUM) => "enum",
Some(lsp::CompletionItemKind::KEYWORD) => "keyword",
Some(lsp::CompletionItemKind::SNIPPET) => "snippet",
Some(lsp::CompletionItemKind::COLOR) => "color",
Some(lsp::CompletionItemKind::FILE) => "file",
Some(lsp::CompletionItemKind::REFERENCE) => "reference",
Some(lsp::CompletionItemKind::FOLDER) => "folder",
Some(lsp::CompletionItemKind::ENUM_MEMBER) => "enum_member",
Some(lsp::CompletionItemKind::CONSTANT) => "constant",
Some(lsp::CompletionItemKind::STRUCT) => "struct",
Some(lsp::CompletionItemKind::EVENT) => "event",
Some(lsp::CompletionItemKind::OPERATOR) => "operator",
Some(lsp::CompletionItemKind::TYPE_PARAMETER) => "type_param",
Some(kind) => unimplemented!("{:?}", kind),
None => "",
}),
// self.detail.as_deref().unwrap_or("")
// self.label_details
// .as_ref()
// .or(self.detail())
// .as_str(),
])
}
}
/// Wraps a Menu.
pub struct Completion {
popup: Popup<Menu<CompletionItem>>,
start_offset: usize,
#[allow(dead_code)]
trigger_offset: usize,
// TODO: maintain a completioncontext with trigger kind & trigger char
}
impl Completion {
pub fn new(
editor: &Editor,
items: Vec<CompletionItem>,
offset_encoding: helix_lsp::OffsetEncoding,
start_offset: usize,
trigger_offset: usize,
) -> Self {
let menu = Menu::new(items, move |editor: &mut Editor, item, event| {
fn item_to_transaction(
doc: &Document,
item: &CompletionItem,
offset_encoding: helix_lsp::OffsetEncoding,
start_offset: usize,
trigger_offset: usize,
) -> Transaction {
if let Some(edit) = &item.text_edit {
let edit = match edit {
lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
lsp::CompletionTextEdit::InsertAndReplace(item) => {
unimplemented!("completion: insert_and_replace {:?}", item)
}
};
util::generate_transaction_from_edits(
doc.text(),
vec![edit],
offset_encoding, // TODO: should probably transcode in Client
)
} else {
let text = item.insert_text.as_ref().unwrap_or(&item.label);
// Some LSPs just give you an insertText with no offset ¯\_(ツ)_/¯
// in these cases we need to check for a common prefix and remove it
let prefix = Cow::from(doc.text().slice(start_offset..trigger_offset));
let text = text.trim_start_matches::<&str>(&prefix);
Transaction::change(
doc.text(),
vec![(trigger_offset, trigger_offset, Some(text.into()))].into_iter(),
)
}
}
let (view, doc) = current!(editor);
// if more text was entered, remove it
doc.restore(view.id);
match event {
PromptEvent::Abort => {}
PromptEvent::Update => {
// always present here
let item = item.unwrap();
let transaction = item_to_transaction(
doc,
item,
offset_encoding,
start_offset,
trigger_offset,
);
// initialize a savepoint
doc.savepoint();
doc.apply(&transaction, view.id);
}
PromptEvent::Validate => {
// always present here
let item = item.unwrap();
let transaction = item_to_transaction(
doc,
item,
offset_encoding,
start_offset,
trigger_offset,
);
doc.apply(&transaction, view.id);
if let Some(additional_edits) = &item.additional_text_edits {
// gopls uses this to add extra imports
if !additional_edits.is_empty() {
let transaction = util::generate_transaction_from_edits(
doc.text(),
additional_edits.clone(),
offset_encoding, // TODO: should probably transcode in Client
);
doc.apply(&transaction, view.id);
}
}
}
};
});
let popup = Popup::new("completion", menu);
let mut completion = Self {
popup,
start_offset,
trigger_offset,
};
// need to recompute immediately in case start_offset != trigger_offset
completion.recompute_filter(editor);
completion
}
pub fn recompute_filter(&mut self, editor: &Editor) {
// recompute menu based on matches
let menu = self.popup.contents_mut();
let (view, doc) = current_ref!(editor);
// cx.hooks()
// cx.add_hook(enum type, ||)
// cx.trigger_hook(enum type, &str, ...) <-- there has to be enough to identify doc/view
// callback with editor & compositor
//
// trigger_hook sends event into channel, that's consumed in the global loop and
// triggers all registered callbacks
// TODO: hooks should get processed immediately so maybe do it after select!(), before
// looping?
let cursor = doc
.selection(view.id)
.primary()
.cursor(doc.text().slice(..));
if self.trigger_offset <= cursor {
let fragment = doc.text().slice(self.start_offset..cursor);
let text = Cow::from(fragment);
// TODO: logic is same as ui/picker
menu.score(&text);
} else {
// we backspaced before the start offset, clear the menu
// this will cause the editor to remove the completion popup
menu.clear();
}
}
pub fn update(&mut self, cx: &mut commands::Context) {
self.recompute_filter(cx.editor)
}
pub fn is_empty(&self) -> bool {
self.popup.contents().is_empty()
}
}
// need to:
// - trigger on the right trigger char
// - detect previous open instance and recycle
// - update after input, but AFTER the document has changed
// - if no more matches, need to auto close
//
// missing bits:
// - a more robust hook system: emit to a channel, process in main loop
// - a way to find specific layers in compositor
// - components register for hooks, then unregister when terminated
// ... since completion is a special case, maybe just build it into doc/render?
impl Component for Completion {
fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
// let the Editor handle Esc instead
if let Event::Key(KeyEvent {
code: KeyCode::Esc, ..
}) = event
{
return EventResult::Ignored;
}
self.popup.handle_event(event, cx)
}
fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
self.popup.required_size(viewport)
}
fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
self.popup.render(area, surface, cx);
// if we have a selection, render a markdown popup on top/below with info
if let Some(option) = self.popup.contents().selection() {
// need to render:
// option.detail
// ---
// option.documentation
let (view, doc) = current!(cx.editor);
let language = doc
.language()
.and_then(|scope| scope.strip_prefix("source."))
.unwrap_or("");
let text = doc.text().slice(..);
let cursor_pos = doc.selection(view.id).primary().cursor(text);
let coords = helix_core::visual_coords_at_pos(text, cursor_pos, doc.tab_width());
let cursor_pos = (coords.row - view.offset.row) as u16;
let mut markdown_doc = match &option.documentation {
Some(lsp::Documentation::String(contents))
| Some(lsp::Documentation::MarkupContent(lsp::MarkupContent {
kind: lsp::MarkupKind::PlainText,
value: contents,
})) => {
// TODO: convert to wrapped text
Markdown::new(
format!(
"```{}\n{}\n```\n{}",
language,
option.detail.as_deref().unwrap_or_default(),
contents.clone()
),
cx.editor.syn_loader.clone(),
)
}
Some(lsp::Documentation::MarkupContent(lsp::MarkupContent {
kind: lsp::MarkupKind::Markdown,
value: contents,
})) => {
// TODO: set language based on doc scope
Markdown::new(
format!(
"```{}\n{}\n```\n{}",
language,
option.detail.as_deref().unwrap_or_default(),
contents.clone()
),
cx.editor.syn_loader.clone(),
)
}
None if option.detail.is_some() => {
// TODO: copied from above
// TODO: set language based on doc scope
Markdown::new(
format!(
"```{}\n{}\n```",
language,
option.detail.as_deref().unwrap_or_default(),
),
cx.editor.syn_loader.clone(),
)
}
None => return,
};
let (popup_x, popup_y) = self.popup.get_rel_position(area, cx);
let (popup_width, _popup_height) = self.popup.get_size();
let mut width = area
.width
.saturating_sub(popup_x)
.saturating_sub(popup_width);
let area = if width > 30 {
let mut height = area.height.saturating_sub(popup_y);
let x = popup_x + popup_width;
let y = popup_y;
if let Some((rel_width, rel_height)) = markdown_doc.required_size((width, height)) {
width = rel_width;
height = rel_height;
}
Rect::new(x, y, width, height)
} else {
let half = area.height / 2;
let height = 15.min(half);
// we want to make sure the cursor is visible (not hidden behind the documentation)
let y = if cursor_pos + area.y
>= (cx.editor.tree.area().height - height - 2/* statusline + commandline */)
{
0
} else {
// -2 to subtract command line + statusline. a bit of a hack, because of splits.
area.height.saturating_sub(height).saturating_sub(2)
};
Rect::new(0, y, area.width, height)
};
// clear area
let background = cx.editor.theme.get("ui.popup");
surface.clear_with(area, background);
markdown_doc.render(area, surface, cx);
}
}
}