completion fix

helix-term/src/commands.rs

@@ -2887,13 +2887,11 @@ pub mod insert {
         super::completion(cx);
     }
 
-    fn language_server_completion(cx: &mut Context, ch: char) {
+    pub fn is_server_trigger_char(doc: &Document, ch: char) -> bool {
         use helix_lsp::lsp;
-        // if ch matches completion char, trigger completion
-        let doc = doc_mut!(cx.editor);
         let language_server = match doc.language_server() {
             Some(language_server) => language_server,
-            None => return,
+            None => return false,
         };
 
         let capabilities = language_server.capabilities();
@@ -2903,11 +2901,35 @@ pub mod insert {
             ..
         }) = &capabilities.completion_provider
         {
-            // TODO: what if trigger is multiple chars long
-            if triggers.iter().any(|trigger| trigger.contains(ch)) {
-                cx.editor.clear_idle_timer();
-                super::completion(cx);
+            triggers.iter().any(|trigger| trigger.contains(ch))
+        } else {
+            false
+        }
+    }
+
+    fn language_server_completion(cx: &mut Context, ch: char) {
+        use helix_core::chars::char_is_word;
+
+        let config = cx.editor.config();
+        if !config.auto_completion {
+            return;
+        }
+        let (view, doc) = current_ref!(cx.editor);
+        if char_is_word(ch) && doc.savepoint.is_none() {
+            let text = doc.text().slice(..);
+            let cursor = doc.selection(view.id).primary().cursor(text);
+            let mut iter = text.chars_at(cursor);
+            iter.reverse();
+            for _ in 0..config.completion_trigger_len {
+                if iter.next().map_or(true, |c| !char_is_word(c)) {
+                    return;
+                }
             }
+            cx.editor.reset_idle_timer();
+            return;
+        }
+        if is_server_trigger_char(doc, ch) {
+            cx.editor.reset_idle_timer_zero();
         }
     }
 
@@ -3819,6 +3841,13 @@ pub fn completion(cx: &mut Context) {
     let pos = pos_to_lsp_pos(doc.text(), cursor, offset_encoding);
 
     let future = language_server.completion(doc.identifier(), pos, None);
+    let future = async move {
+        match future.await {
+            Ok(v) => Ok(v),
+            Err(helix_lsp::Error::Timeout) => Ok(serde_json::Value::Null),
+            Err(e) => Err(e),
+        }
+    };
 
     let trigger_offset = cursor;
 
@@ -3832,11 +3861,21 @@ pub fn completion(cx: &mut Context) {
     let start_offset = cursor.saturating_sub(offset);
     let prefix = text.slice(start_offset..cursor).to_string();
 
+    doc.savepoint();
+    let trigger_version = doc.version();
     cx.callback(
         future,
         move |editor, compositor, response: Option<lsp::CompletionResponse>| {
+            let doc = doc_mut!(editor);
+            let savepoint = match doc.savepoint.take() {
+                Some(s) => s,
+                None => return,
+            };
             if editor.mode != Mode::Insert {
-                // we're not in insert mode anymore
+                return;
+            }
+            if savepoint.0 != trigger_version {
+                doc.savepoint = Some(savepoint);
                 return;
             }
 
@@ -3847,25 +3886,27 @@ pub fn completion(cx: &mut Context) {
                     is_incomplete: _is_incomplete,
                     items,
                 })) => items,
-                None => Vec::new(),
+                None => {
+                    editor.set_status(
+                        "The completion response is none and will request server again",
+                    );
+                    editor.reset_idle_timer();
+                    return;
+                }
             };
 
             if !prefix.is_empty() {
-                items = items
-                    .into_iter()
-                    .filter(|item| {
-                        item.filter_text
-                            .as_ref()
-                            .unwrap_or(&item.label)
-                            .starts_with(&prefix)
-                    })
-                    .collect();
-            }
+                items.retain(|item| match &item.filter_text {
+                    Some(t) => t.starts_with(&prefix),
+                    None => item.label.starts_with(&prefix),
+                });
+            };
 
             if items.is_empty() {
-                // editor.set_error("No completion available");
+                // editor.set_error("No completion available".to_string());
                 return;
             }
+            doc.savepoint = Some(savepoint);
             let size = compositor.size();
             let ui = compositor.find::<ui::EditorView>().unwrap();
             ui.set_completion(

helix-term/src/ui/completion.rs

@@ -394,6 +394,16 @@ impl Component for Completion {
                     height = rel_height.min(height);
                 }
                 Rect::new(x, y, width, height)
+            } else if popup_x > 30 {
+                let mut height = area.height.saturating_sub(popup_y);
+                let mut width = popup_x;
+                if let Some((rel_width, rel_height)) = markdown_doc.required_size((width, height)) {
+                    width = rel_width.min(width);
+                    height = rel_height.min(height);
+                }
+                let x = popup_x - width;
+                let y = popup_y;
+                Rect::new(x, y, width, height)
             } else {
                 let half = area.height / 2;
                 let height = 15.min(half);

helix-term/src/ui/editor.rs

@@ -851,7 +851,7 @@ impl EditorView {
                 }
                 (Mode::Insert, Mode::Normal) => {
                     // if exiting insert mode, remove completion
-                    self.completion = None;
+                    self.clear_completion(cxt.editor);
 
                     // TODO: Use an on_mode_change hook to remove signature help
                     cxt.jobs.callback(async {
@@ -985,9 +985,6 @@ impl EditorView {
             return;
         }
 
-        // Immediately initialize a savepoint
-        doc_mut!(editor).savepoint();
-
         editor.last_completion = None;
         self.last_insert.1.push(InsertEvent::TriggerCompletion);
 
@@ -1006,23 +1003,20 @@ impl EditorView {
     }
 
     pub fn handle_idle_timeout(&mut self, cx: &mut crate::compositor::Context) -> EventResult {
-        if self.completion.is_some()
-            || cx.editor.mode != Mode::Insert
-            || !cx.editor.config().auto_completion
-        {
+        let config = cx.editor.config();
+        if cx.editor.mode != Mode::Insert || !config.auto_completion {
             return EventResult::Ignored(None);
         }
 
-        let mut cx = commands::Context {
+        self.clear_completion(cx.editor);
+        commands::completion(&mut commands::Context {
             register: None,
             editor: cx.editor,
             jobs: cx.jobs,
             count: None,
             callback: None,
             on_next_key_callback: None,
-        };
-        crate::commands::insert::idle_completion(&mut cx);
-
+        });
         EventResult::Consumed(None)
     }
 }
@@ -1246,7 +1240,7 @@ impl Component for EditorView {
                 EventResult::Consumed(None)
             }
             Event::Key(mut key) => {
-                cx.editor.reset_idle_timer();
+                cx.editor.clear_idle_timer();
                 canonicalize_key(&mut key);
 
                 // clear status
@@ -1298,7 +1292,8 @@ impl Component for EditorView {
                                 if let Some(completion) = &mut self.completion {
                                     completion.update(&mut cx);
                                     if completion.is_empty() {
-                                        self.clear_completion(cx.editor);
+                                        self.completion = None;
+                                        doc_mut!(cx.editor).savepoint = None;
                                     }
                                 }
                             }

helix-view/src/document.rs

@@ -112,7 +112,7 @@ pub struct Document {
     // be more troublesome.
     pub history: Cell<History>,
 
-    pub savepoint: Option<Transaction>,
+    pub savepoint: Option<(i32, Transaction)>,
 
     last_saved_revision: usize,
     version: i32, // should be usize?
@@ -768,7 +768,8 @@ impl Document {
             if self.savepoint.is_some() {
                 take_with(&mut self.savepoint, |prev_revert| {
                     let revert = transaction.invert(&old_doc);
-                    Some(revert.compose(prev_revert.unwrap()))
+                    let (version, prev_revert) = prev_revert.unwrap();
+                    Some((version, revert.compose(prev_revert)))
                 });
             }
 
@@ -856,11 +857,11 @@ impl Document {
     }
 
     pub fn savepoint(&mut self) {
-        self.savepoint = Some(Transaction::new(self.text()));
+        self.savepoint = Some((self.version, Transaction::new(self.text())));
     }
 
     pub fn restore(&mut self, view_id: ViewId) {
-        if let Some(revert) = self.savepoint.take() {
+        if let Some((_, revert)) = self.savepoint.take() {
             self.apply(&revert, view_id);
         }
     }

helix-view/src/editor.rs

@@ -763,6 +763,10 @@ impl Editor {
             .reset(Instant::now() + config.idle_timeout);
     }
 
+    pub fn reset_idle_timer_zero(&mut self) {
+        self.idle_timer.as_mut().reset(Instant::now());
+    }
+
     pub fn clear_status(&mut self) {
         self.status_msg = None;
     }