1use crate::{Supermaven, SupermavenCompletionStateId};
2use anyhow::Result;
3use futures::StreamExt as _;
4use gpui::{AppContext, EntityId, Model, ModelContext, Task};
5use inline_completion::{Direction, InlineCompletion, InlineCompletionProvider};
6use language::{language_settings::all_language_settings, Anchor, Buffer, BufferSnapshot};
7use std::{
8 ops::{AddAssign, Range},
9 path::Path,
10 time::Duration,
11};
12use text::{ToOffset, ToPoint};
13use unicode_segmentation::UnicodeSegmentation;
14
15pub const DEBOUNCE_TIMEOUT: Duration = Duration::from_millis(75);
16
17pub struct SupermavenCompletionProvider {
18 supermaven: Model<Supermaven>,
19 buffer_id: Option<EntityId>,
20 completion_id: Option<SupermavenCompletionStateId>,
21 file_extension: Option<String>,
22 pending_refresh: Task<Result<()>>,
23}
24
25impl SupermavenCompletionProvider {
26 pub fn new(supermaven: Model<Supermaven>) -> Self {
27 Self {
28 supermaven,
29 buffer_id: None,
30 completion_id: None,
31 file_extension: None,
32 pending_refresh: Task::ready(Ok(())),
33 }
34 }
35}
36
37// Computes the inline completion from the difference between the completion text.
38// this is defined by greedily matching the buffer text against the completion text, with any leftover buffer placed at the end.
39// for example, given the completion text "moo cows are cool" and the buffer text "cowsre pool", the completion state would be
40// the inlays "moo ", " a", and "cool" which will render as "[moo ]cows[ a]re [cool]pool" in the editor.
41fn completion_from_diff(
42 snapshot: BufferSnapshot,
43 completion_text: &str,
44 position: Anchor,
45 delete_range: Range<Anchor>,
46) -> InlineCompletion {
47 let buffer_text = snapshot
48 .text_for_range(delete_range.clone())
49 .collect::<String>();
50
51 let mut edits: Vec<(Range<language::Anchor>, String)> = Vec::new();
52
53 let completion_graphemes: Vec<&str> = completion_text.graphemes(true).collect();
54 let buffer_graphemes: Vec<&str> = buffer_text.graphemes(true).collect();
55
56 let mut offset = position.to_offset(&snapshot);
57
58 let mut i = 0;
59 let mut j = 0;
60 while i < completion_graphemes.len() && j < buffer_graphemes.len() {
61 // find the next instance of the buffer text in the completion text.
62 let k = completion_graphemes[i..]
63 .iter()
64 .position(|c| *c == buffer_graphemes[j]);
65 match k {
66 Some(k) => {
67 if k != 0 {
68 let offset = snapshot.anchor_after(offset);
69 // the range from the current position to item is an inlay.
70 let edit = (offset..offset, completion_graphemes[i..i + k].join(""));
71 edits.push(edit);
72 }
73 i += k + 1;
74 j += 1;
75 offset.add_assign(buffer_graphemes[j - 1].len());
76 }
77 None => {
78 // there are no more matching completions, so drop the remaining
79 // completion text as an inlay.
80 break;
81 }
82 }
83 }
84
85 if j == buffer_graphemes.len() && i < completion_graphemes.len() {
86 let offset = snapshot.anchor_after(offset);
87 // there is leftover completion text, so drop it as an inlay.
88 let edit_range = offset..offset;
89 let edit_text = completion_graphemes[i..].join("");
90 edits.push((edit_range, edit_text));
91 }
92
93 InlineCompletion { edits }
94}
95
96impl InlineCompletionProvider for SupermavenCompletionProvider {
97 fn name() -> &'static str {
98 "supermaven"
99 }
100
101 fn is_enabled(&self, buffer: &Model<Buffer>, cursor_position: Anchor, cx: &AppContext) -> bool {
102 if !self.supermaven.read(cx).is_enabled() {
103 return false;
104 }
105
106 let buffer = buffer.read(cx);
107 let file = buffer.file();
108 let language = buffer.language_at(cursor_position);
109 let settings = all_language_settings(file, cx);
110 settings.inline_completions_enabled(language.as_ref(), file.map(|f| f.path().as_ref()), cx)
111 }
112
113 fn refresh(
114 &mut self,
115 buffer_handle: Model<Buffer>,
116 cursor_position: Anchor,
117 debounce: bool,
118 cx: &mut ModelContext<Self>,
119 ) {
120 let Some(mut completion) = self.supermaven.update(cx, |supermaven, cx| {
121 supermaven.complete(&buffer_handle, cursor_position, cx)
122 }) else {
123 return;
124 };
125
126 self.pending_refresh = cx.spawn(|this, mut cx| async move {
127 if debounce {
128 cx.background_executor().timer(DEBOUNCE_TIMEOUT).await;
129 }
130
131 while let Some(()) = completion.updates.next().await {
132 this.update(&mut cx, |this, cx| {
133 this.completion_id = Some(completion.id);
134 this.buffer_id = Some(buffer_handle.entity_id());
135 this.file_extension = buffer_handle.read(cx).file().and_then(|file| {
136 Some(
137 Path::new(file.file_name(cx))
138 .extension()?
139 .to_str()?
140 .to_string(),
141 )
142 });
143 cx.notify();
144 })?;
145 }
146 Ok(())
147 });
148 }
149
150 fn cycle(
151 &mut self,
152 _buffer: Model<Buffer>,
153 _cursor_position: Anchor,
154 _direction: Direction,
155 _cx: &mut ModelContext<Self>,
156 ) {
157 }
158
159 fn accept(&mut self, _cx: &mut ModelContext<Self>) {
160 self.pending_refresh = Task::ready(Ok(()));
161 self.completion_id = None;
162 }
163
164 fn discard(&mut self, _cx: &mut ModelContext<Self>) {
165 self.pending_refresh = Task::ready(Ok(()));
166 self.completion_id = None;
167 }
168
169 fn suggest(
170 &mut self,
171 buffer: &Model<Buffer>,
172 cursor_position: Anchor,
173 cx: &mut ModelContext<Self>,
174 ) -> Option<InlineCompletion> {
175 let completion_text = self
176 .supermaven
177 .read(cx)
178 .completion(buffer, cursor_position, cx)?;
179
180 let completion_text = trim_to_end_of_line_unless_leading_newline(completion_text);
181
182 let completion_text = completion_text.trim_end();
183
184 if !completion_text.trim().is_empty() {
185 let snapshot = buffer.read(cx).snapshot();
186 let mut point = cursor_position.to_point(&snapshot);
187 point.column = snapshot.line_len(point.row);
188 let range = cursor_position..snapshot.anchor_after(point);
189 Some(completion_from_diff(
190 snapshot,
191 completion_text,
192 cursor_position,
193 range,
194 ))
195 } else {
196 None
197 }
198 }
199}
200
201fn trim_to_end_of_line_unless_leading_newline(text: &str) -> &str {
202 if has_leading_newline(text) {
203 text
204 } else if let Some(i) = text.find('\n') {
205 &text[..i]
206 } else {
207 text
208 }
209}
210
211fn has_leading_newline(text: &str) -> bool {
212 for c in text.chars() {
213 if c == '\n' {
214 return true;
215 }
216 if !c.is_whitespace() {
217 return false;
218 }
219 }
220 false
221}