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|
use crate::compositor::{Component, Compositor, Context, EventResult};
use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
use tui::{
buffer::Buffer as Surface,
layout::Rect,
style::{Color, Style},
widgets::{Block, Borders},
};
use std::borrow::Cow;
use helix_core::{Position, Transaction};
use helix_view::Editor;
use crate::commands;
use crate::ui::{Markdown, Menu, Popup, PromptEvent};
use helix_lsp::lsp;
use lsp::CompletionItem;
/// Wraps a Menu.
pub struct Completion {
popup: Popup<Menu<CompletionItem>>, // TODO: Popup<Menu> need to be able to access contents.
trigger_offset: usize,
// TODO: maintain a completioncontext with trigger kind & trigger char
}
impl Completion {
pub fn new(
items: Vec<CompletionItem>,
offset_encoding: helix_lsp::OffsetEncoding,
trigger_offset: usize,
) -> Self {
// let items: Vec<CompletionItem> = Vec::new();
let mut menu = Menu::new(
items,
|item| {
// format_fn
item.label.as_str().into()
// TODO: use item.filter_text for filtering
},
move |editor: &mut Editor, item, event| {
match event {
PromptEvent::Abort => {
// revert state
// let id = editor.view().doc;
// let doc = &mut editor.documents[id];
// doc.state = snapshot.clone();
}
PromptEvent::Validate => {
let (view, doc) = editor.current();
// revert state to what it was before the last update
// doc.state = snapshot.clone();
// extract as fn(doc, item):
// TODO: need to apply without composing state...
// TODO: need to update lsp on accept/cancel by diffing the snapshot with
// the final state?
// -> on update simply update the snapshot, then on accept redo the call,
// finally updating doc.changes + notifying lsp.
//
// or we could simply use doc.undo + apply when changing between options
// always present here
let item = item.unwrap();
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
);
}
}
// if more text was entered, remove it
let cursor = doc.selection(view.id).cursor();
if trigger_offset < cursor {
let remove = Transaction::change(
doc.text(),
vec![(trigger_offset, cursor, None)].into_iter(),
);
doc.apply(&remove, view.id);
}
use helix_lsp::OffsetEncoding;
let transaction = util::generate_transaction_from_edits(
doc.text(),
vec![edit],
offset_encoding, // TODO: should probably transcode in Client
);
doc.apply(&transaction, view.id);
}
_ => (),
};
},
);
let popup = Popup::new(menu);
Self {
popup,
trigger_offset,
}
}
pub fn update(&mut self, cx: &mut commands::Context) {
// recompute menu based on matches
let menu = self.popup.contents_mut();
let (view, doc) = cx.editor.current();
// 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).cursor();
if self.trigger_offset <= cursor {
let fragment = doc.text().slice(self.trigger_offset..cursor);
let text = Cow::from(fragment);
// TODO: logic is same as ui/picker
menu.score(&text);
}
}
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 {
self.popup.handle_event(event, cx)
}
fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
self.popup.required_size(viewport)
}
fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
self.popup.render(area, surface, cx);
// TODO: 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
match &option.documentation {
Some(lsp::Documentation::String(s))
| Some(lsp::Documentation::MarkupContent(lsp::MarkupContent {
kind: lsp::MarkupKind::PlainText,
value: s,
})) => {
// TODO: convert to wrapped text
let doc = s;
}
Some(lsp::Documentation::MarkupContent(lsp::MarkupContent {
kind: lsp::MarkupKind::Markdown,
value: contents,
})) => {
let doc = Markdown::new(contents.clone());
let half = area.height / 2;
let height = 15.min(half);
// -2 to subtract command line + statusline. a bit of a hack, because of splits.
let area = Rect::new(0, area.height - height - 2, area.width, height);
// clear area
let background = cx.editor.theme.get("ui.popup");
surface.clear_with(area, background);
doc.render(area, surface, cx);
}
None => (),
}
}
}
}
|
