1use crate::{
2 DebugEvent, EditPredictionFinishedDebugEvent, EditPredictionId, EditPredictionModelInput,
3 EditPredictionStartedDebugEvent, open_ai_response::text_from_response,
4 prediction::EditPredictionResult,
5};
6use anyhow::{Context as _, Result};
7use futures::AsyncReadExt as _;
8use gpui::{
9 App, AppContext as _, Entity, SharedString, Task,
10 http_client::{self, AsyncBody, Method},
11};
12use language::{OffsetRangeExt as _, ToOffset, ToPoint as _};
13use language_model::{ApiKeyState, EnvVar, env_var};
14use std::{mem, ops::Range, path::Path, sync::Arc, time::Instant};
15use zeta_prompt::ZetaPromptInput;
16
17const MERCURY_API_URL: &str = "https://api.inceptionlabs.ai/v1/edit/completions";
18const MAX_CONTEXT_TOKENS: usize = 150;
19const MAX_REWRITE_TOKENS: usize = 350;
20
21pub struct Mercury {
22 pub api_token: Entity<ApiKeyState>,
23}
24
25impl Mercury {
26 pub fn new(cx: &mut App) -> Self {
27 Mercury {
28 api_token: mercury_api_token(cx),
29 }
30 }
31
32 pub(crate) fn request_prediction(
33 &self,
34 EditPredictionModelInput {
35 buffer,
36 snapshot,
37 position,
38 events,
39 related_files,
40 debug_tx,
41 ..
42 }: EditPredictionModelInput,
43 cx: &mut App,
44 ) -> Task<Result<Option<EditPredictionResult>>> {
45 self.api_token.update(cx, |key_state, cx| {
46 _ = key_state.load_if_needed(MERCURY_CREDENTIALS_URL, |s| s, cx);
47 });
48 let Some(api_token) = self.api_token.read(cx).key(&MERCURY_CREDENTIALS_URL) else {
49 return Task::ready(Ok(None));
50 };
51 let full_path: Arc<Path> = snapshot
52 .file()
53 .map(|file| file.full_path(cx))
54 .unwrap_or_else(|| "untitled".into())
55 .into();
56
57 let http_client = cx.http_client();
58 let cursor_point = position.to_point(&snapshot);
59 let buffer_snapshotted_at = Instant::now();
60 let active_buffer = buffer.clone();
61
62 let result = cx.background_spawn(async move {
63 let (editable_range, context_range) =
64 crate::cursor_excerpt::editable_and_context_ranges_for_cursor_position(
65 cursor_point,
66 &snapshot,
67 MAX_CONTEXT_TOKENS,
68 MAX_REWRITE_TOKENS,
69 );
70
71 let context_offset_range = context_range.to_offset(&snapshot);
72
73 let editable_offset_range = editable_range.to_offset(&snapshot);
74
75 let inputs = zeta_prompt::ZetaPromptInput {
76 events,
77 related_files,
78 cursor_offset_in_excerpt: cursor_point.to_offset(&snapshot)
79 - context_range.start.to_offset(&snapshot),
80 cursor_path: full_path.clone(),
81 cursor_excerpt: snapshot
82 .text_for_range(context_range)
83 .collect::<String>()
84 .into(),
85 editable_range_in_excerpt: (editable_offset_range.start
86 - context_offset_range.start)
87 ..(editable_offset_range.end - context_offset_range.start),
88 };
89
90 let prompt = build_prompt(&inputs);
91
92 if let Some(debug_tx) = &debug_tx {
93 debug_tx
94 .unbounded_send(DebugEvent::EditPredictionStarted(
95 EditPredictionStartedDebugEvent {
96 buffer: active_buffer.downgrade(),
97 prompt: Some(prompt.clone()),
98 position,
99 },
100 ))
101 .ok();
102 }
103
104 let request_body = open_ai::Request {
105 model: "mercury-coder".into(),
106 messages: vec![open_ai::RequestMessage::User {
107 content: open_ai::MessageContent::Plain(prompt),
108 }],
109 stream: false,
110 max_completion_tokens: None,
111 stop: vec![],
112 temperature: None,
113 tool_choice: None,
114 parallel_tool_calls: None,
115 tools: vec![],
116 prompt_cache_key: None,
117 reasoning_effort: None,
118 };
119
120 let buf = serde_json::to_vec(&request_body)?;
121 let body: AsyncBody = buf.into();
122
123 let request = http_client::Request::builder()
124 .uri(MERCURY_API_URL)
125 .header("Content-Type", "application/json")
126 .header("Authorization", format!("Bearer {}", api_token))
127 .header("Connection", "keep-alive")
128 .method(Method::POST)
129 .body(body)
130 .context("Failed to create request")?;
131
132 let mut response = http_client
133 .send(request)
134 .await
135 .context("Failed to send request")?;
136
137 let mut body: Vec<u8> = Vec::new();
138 response
139 .body_mut()
140 .read_to_end(&mut body)
141 .await
142 .context("Failed to read response body")?;
143
144 let response_received_at = Instant::now();
145 if !response.status().is_success() {
146 anyhow::bail!(
147 "Request failed with status: {:?}\nBody: {}",
148 response.status(),
149 String::from_utf8_lossy(&body),
150 );
151 };
152
153 let mut response: open_ai::Response =
154 serde_json::from_slice(&body).context("Failed to parse response")?;
155
156 let id = mem::take(&mut response.id);
157 let response_str = text_from_response(response).unwrap_or_default();
158
159 if let Some(debug_tx) = &debug_tx {
160 debug_tx
161 .unbounded_send(DebugEvent::EditPredictionFinished(
162 EditPredictionFinishedDebugEvent {
163 buffer: active_buffer.downgrade(),
164 model_output: Some(response_str.clone()),
165 position,
166 },
167 ))
168 .ok();
169 }
170
171 let response_str = response_str.strip_prefix("```\n").unwrap_or(&response_str);
172 let response_str = response_str.strip_suffix("\n```").unwrap_or(&response_str);
173
174 let mut edits = Vec::new();
175 const NO_PREDICTION_OUTPUT: &str = "None";
176
177 if response_str != NO_PREDICTION_OUTPUT {
178 let old_text = snapshot
179 .text_for_range(editable_offset_range.clone())
180 .collect::<String>();
181 edits.extend(
182 language::text_diff(&old_text, &response_str)
183 .into_iter()
184 .map(|(range, text)| {
185 (
186 snapshot.anchor_after(editable_offset_range.start + range.start)
187 ..snapshot
188 .anchor_before(editable_offset_range.start + range.end),
189 text,
190 )
191 }),
192 );
193 }
194
195 anyhow::Ok((id, edits, snapshot, response_received_at, inputs))
196 });
197
198 cx.spawn(async move |cx| {
199 let (id, edits, old_snapshot, response_received_at, inputs) =
200 result.await.context("Mercury edit prediction failed")?;
201 anyhow::Ok(Some(
202 EditPredictionResult::new(
203 EditPredictionId(id.into()),
204 &buffer,
205 &old_snapshot,
206 edits.into(),
207 buffer_snapshotted_at,
208 response_received_at,
209 inputs,
210 cx,
211 )
212 .await,
213 ))
214 })
215 }
216}
217
218fn build_prompt(inputs: &ZetaPromptInput) -> String {
219 const RECENTLY_VIEWED_SNIPPETS_START: &str = "<|recently_viewed_code_snippets|>\n";
220 const RECENTLY_VIEWED_SNIPPETS_END: &str = "<|/recently_viewed_code_snippets|>\n";
221 const RECENTLY_VIEWED_SNIPPET_START: &str = "<|recently_viewed_code_snippet|>\n";
222 const RECENTLY_VIEWED_SNIPPET_END: &str = "<|/recently_viewed_code_snippet|>\n";
223 const CURRENT_FILE_CONTENT_START: &str = "<|current_file_content|>\n";
224 const CURRENT_FILE_CONTENT_END: &str = "<|/current_file_content|>\n";
225 const CODE_TO_EDIT_START: &str = "<|code_to_edit|>\n";
226 const CODE_TO_EDIT_END: &str = "<|/code_to_edit|>\n";
227 const EDIT_DIFF_HISTORY_START: &str = "<|edit_diff_history|>\n";
228 const EDIT_DIFF_HISTORY_END: &str = "<|/edit_diff_history|>\n";
229 const CURSOR_TAG: &str = "<|cursor|>";
230 const CODE_SNIPPET_FILE_PATH_PREFIX: &str = "code_snippet_file_path: ";
231 const CURRENT_FILE_PATH_PREFIX: &str = "current_file_path: ";
232
233 let mut prompt = String::new();
234
235 push_delimited(
236 &mut prompt,
237 RECENTLY_VIEWED_SNIPPETS_START..RECENTLY_VIEWED_SNIPPETS_END,
238 |prompt| {
239 for related_file in inputs.related_files.iter() {
240 for related_excerpt in &related_file.excerpts {
241 push_delimited(
242 prompt,
243 RECENTLY_VIEWED_SNIPPET_START..RECENTLY_VIEWED_SNIPPET_END,
244 |prompt| {
245 prompt.push_str(CODE_SNIPPET_FILE_PATH_PREFIX);
246 prompt.push_str(related_file.path.to_string_lossy().as_ref());
247 prompt.push('\n');
248 prompt.push_str(&related_excerpt.text.to_string());
249 },
250 );
251 }
252 }
253 },
254 );
255
256 push_delimited(
257 &mut prompt,
258 CURRENT_FILE_CONTENT_START..CURRENT_FILE_CONTENT_END,
259 |prompt| {
260 prompt.push_str(CURRENT_FILE_PATH_PREFIX);
261 prompt.push_str(inputs.cursor_path.as_os_str().to_string_lossy().as_ref());
262 prompt.push('\n');
263
264 prompt.push_str(&inputs.cursor_excerpt[0..inputs.editable_range_in_excerpt.start]);
265 push_delimited(prompt, CODE_TO_EDIT_START..CODE_TO_EDIT_END, |prompt| {
266 prompt.push_str(
267 &inputs.cursor_excerpt
268 [inputs.editable_range_in_excerpt.start..inputs.cursor_offset_in_excerpt],
269 );
270 prompt.push_str(CURSOR_TAG);
271 prompt.push_str(
272 &inputs.cursor_excerpt
273 [inputs.cursor_offset_in_excerpt..inputs.editable_range_in_excerpt.end],
274 );
275 });
276 prompt.push_str(&inputs.cursor_excerpt[inputs.editable_range_in_excerpt.end..]);
277 },
278 );
279
280 push_delimited(
281 &mut prompt,
282 EDIT_DIFF_HISTORY_START..EDIT_DIFF_HISTORY_END,
283 |prompt| {
284 for event in inputs.events.iter() {
285 zeta_prompt::write_event(prompt, &event);
286 }
287 },
288 );
289
290 prompt
291}
292
293fn push_delimited(prompt: &mut String, delimiters: Range<&str>, cb: impl FnOnce(&mut String)) {
294 prompt.push_str(delimiters.start);
295 cb(prompt);
296 prompt.push_str(delimiters.end);
297}
298
299pub const MERCURY_CREDENTIALS_URL: SharedString =
300 SharedString::new_static("https://api.inceptionlabs.ai/v1/edit/completions");
301pub const MERCURY_CREDENTIALS_USERNAME: &str = "mercury-api-token";
302pub static MERCURY_TOKEN_ENV_VAR: std::sync::LazyLock<EnvVar> = env_var!("MERCURY_AI_TOKEN");
303pub static MERCURY_API_KEY: std::sync::OnceLock<Entity<ApiKeyState>> = std::sync::OnceLock::new();
304
305pub fn mercury_api_token(cx: &mut App) -> Entity<ApiKeyState> {
306 MERCURY_API_KEY
307 .get_or_init(|| {
308 cx.new(|_| ApiKeyState::new(MERCURY_CREDENTIALS_URL, MERCURY_TOKEN_ENV_VAR.clone()))
309 })
310 .clone()
311}