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 display_name() -> &'static str {
102 "Supermaven"
103 }
104
105 fn show_completions_in_menu() -> bool {
106 false
107 }
108
109 fn is_enabled(&self, buffer: &Model<Buffer>, cursor_position: Anchor, cx: &AppContext) -> bool {
110 if !self.supermaven.read(cx).is_enabled() {
111 return false;
112 }
113
114 let buffer = buffer.read(cx);
115 let file = buffer.file();
116 let language = buffer.language_at(cursor_position);
117 let settings = all_language_settings(file, cx);
118 settings.inline_completions_enabled(language.as_ref(), file.map(|f| f.path().as_ref()), cx)
119 }
120
121 fn refresh(
122 &mut self,
123 buffer_handle: Model<Buffer>,
124 cursor_position: Anchor,
125 debounce: bool,
126 cx: &mut ModelContext<Self>,
127 ) {
128 let Some(mut completion) = self.supermaven.update(cx, |supermaven, cx| {
129 supermaven.complete(&buffer_handle, cursor_position, cx)
130 }) else {
131 return;
132 };
133
134 self.pending_refresh = cx.spawn(|this, mut cx| async move {
135 if debounce {
136 cx.background_executor().timer(DEBOUNCE_TIMEOUT).await;
137 }
138
139 while let Some(()) = completion.updates.next().await {
140 this.update(&mut cx, |this, cx| {
141 this.completion_id = Some(completion.id);
142 this.buffer_id = Some(buffer_handle.entity_id());
143 this.file_extension = buffer_handle.read(cx).file().and_then(|file| {
144 Some(
145 Path::new(file.file_name(cx))
146 .extension()?
147 .to_str()?
148 .to_string(),
149 )
150 });
151 cx.notify();
152 })?;
153 }
154 Ok(())
155 });
156 }
157
158 fn cycle(
159 &mut self,
160 _buffer: Model<Buffer>,
161 _cursor_position: Anchor,
162 _direction: Direction,
163 _cx: &mut ModelContext<Self>,
164 ) {
165 }
166
167 fn accept(&mut self, _cx: &mut ModelContext<Self>) {
168 self.pending_refresh = Task::ready(Ok(()));
169 self.completion_id = None;
170 }
171
172 fn discard(&mut self, _cx: &mut ModelContext<Self>) {
173 self.pending_refresh = Task::ready(Ok(()));
174 self.completion_id = None;
175 }
176
177 fn suggest(
178 &mut self,
179 buffer: &Model<Buffer>,
180 cursor_position: Anchor,
181 cx: &mut ModelContext<Self>,
182 ) -> Option<InlineCompletion> {
183 let completion_text = self
184 .supermaven
185 .read(cx)
186 .completion(buffer, cursor_position, cx)?;
187
188 let completion_text = trim_to_end_of_line_unless_leading_newline(completion_text);
189
190 let completion_text = completion_text.trim_end();
191
192 if !completion_text.trim().is_empty() {
193 let snapshot = buffer.read(cx).snapshot();
194 let mut point = cursor_position.to_point(&snapshot);
195 point.column = snapshot.line_len(point.row);
196 let range = cursor_position..snapshot.anchor_after(point);
197 Some(completion_from_diff(
198 snapshot,
199 completion_text,
200 cursor_position,
201 range,
202 ))
203 } else {
204 None
205 }
206 }
207}
208
209fn trim_to_end_of_line_unless_leading_newline(text: &str) -> &str {
210 if has_leading_newline(text) {
211 text
212 } else if let Some(i) = text.find('\n') {
213 &text[..i]
214 } else {
215 text
216 }
217}
218
219fn has_leading_newline(text: &str) -> bool {
220 for c in text.chars() {
221 if c == '\n' {
222 return true;
223 }
224 if !c.is_whitespace() {
225 return false;
226 }
227 }
228 false
229}