1use crate::{
2 DebugEvent, EditPredictionFinishedDebugEvent, EditPredictionId, EditPredictionModelInput,
3 EditPredictionStartedDebugEvent, open_ai_response::text_from_response,
4 prediction::EditPredictionResult, zeta1::compute_edits,
5};
6use anyhow::{Context as _, Result};
7use futures::AsyncReadExt as _;
8use gpui::{
9 App, AppContext as _, Entity, Global, 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_REWRITE_TOKENS: usize = 150;
19const MAX_CONTEXT_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 related_files = crate::filter_redundant_excerpts(
72 related_files,
73 full_path.as_ref(),
74 context_range.start.row..context_range.end.row,
75 );
76
77 let context_offset_range = context_range.to_offset(&snapshot);
78
79 let editable_offset_range = editable_range.to_offset(&snapshot);
80
81 let inputs = zeta_prompt::ZetaPromptInput {
82 events,
83 related_files,
84 cursor_offset_in_excerpt: cursor_point.to_offset(&snapshot)
85 - context_range.start.to_offset(&snapshot),
86 cursor_path: full_path.clone(),
87 cursor_excerpt: snapshot
88 .text_for_range(context_range)
89 .collect::<String>()
90 .into(),
91 editable_range_in_excerpt: (editable_offset_range.start
92 - context_offset_range.start)
93 ..(editable_offset_range.end - context_offset_range.start),
94 };
95
96 let prompt = build_prompt(&inputs);
97
98 if let Some(debug_tx) = &debug_tx {
99 debug_tx
100 .unbounded_send(DebugEvent::EditPredictionStarted(
101 EditPredictionStartedDebugEvent {
102 buffer: active_buffer.downgrade(),
103 prompt: Some(prompt.clone()),
104 position,
105 },
106 ))
107 .ok();
108 }
109
110 let request_body = open_ai::Request {
111 model: "mercury-coder".into(),
112 messages: vec![open_ai::RequestMessage::User {
113 content: open_ai::MessageContent::Plain(prompt),
114 }],
115 stream: false,
116 max_completion_tokens: None,
117 stop: vec![],
118 temperature: None,
119 tool_choice: None,
120 parallel_tool_calls: None,
121 tools: vec![],
122 prompt_cache_key: None,
123 reasoning_effort: None,
124 };
125
126 let buf = serde_json::to_vec(&request_body)?;
127 let body: AsyncBody = buf.into();
128
129 let request = http_client::Request::builder()
130 .uri(MERCURY_API_URL)
131 .header("Content-Type", "application/json")
132 .header("Authorization", format!("Bearer {}", api_token))
133 .header("Connection", "keep-alive")
134 .method(Method::POST)
135 .body(body)
136 .context("Failed to create request")?;
137
138 let mut response = http_client
139 .send(request)
140 .await
141 .context("Failed to send request")?;
142
143 let mut body: Vec<u8> = Vec::new();
144 response
145 .body_mut()
146 .read_to_end(&mut body)
147 .await
148 .context("Failed to read response body")?;
149
150 let response_received_at = Instant::now();
151 if !response.status().is_success() {
152 anyhow::bail!(
153 "Request failed with status: {:?}\nBody: {}",
154 response.status(),
155 String::from_utf8_lossy(&body),
156 );
157 };
158
159 let mut response: open_ai::Response =
160 serde_json::from_slice(&body).context("Failed to parse response")?;
161
162 let id = mem::take(&mut response.id);
163 let response_str = text_from_response(response).unwrap_or_default();
164
165 if let Some(debug_tx) = &debug_tx {
166 debug_tx
167 .unbounded_send(DebugEvent::EditPredictionFinished(
168 EditPredictionFinishedDebugEvent {
169 buffer: active_buffer.downgrade(),
170 model_output: Some(response_str.clone()),
171 position,
172 },
173 ))
174 .ok();
175 }
176
177 let response_str = response_str.strip_prefix("```\n").unwrap_or(&response_str);
178 let response_str = response_str.strip_suffix("\n```").unwrap_or(&response_str);
179
180 let mut edits = Vec::new();
181 const NO_PREDICTION_OUTPUT: &str = "None";
182
183 if response_str != NO_PREDICTION_OUTPUT {
184 let old_text = snapshot
185 .text_for_range(editable_offset_range.clone())
186 .collect::<String>();
187 edits = compute_edits(
188 old_text,
189 &response_str,
190 editable_offset_range.start,
191 &snapshot,
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.as_ref());
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('\n');
297 prompt.push_str(delimiters.end);
298}
299
300pub const MERCURY_CREDENTIALS_URL: SharedString =
301 SharedString::new_static("https://api.inceptionlabs.ai/v1/edit/completions");
302pub const MERCURY_CREDENTIALS_USERNAME: &str = "mercury-api-token";
303pub static MERCURY_TOKEN_ENV_VAR: std::sync::LazyLock<EnvVar> = env_var!("MERCURY_AI_TOKEN");
304
305struct GlobalMercuryApiKey(Entity<ApiKeyState>);
306
307impl Global for GlobalMercuryApiKey {}
308
309pub fn mercury_api_token(cx: &mut App) -> Entity<ApiKeyState> {
310 if let Some(global) = cx.try_global::<GlobalMercuryApiKey>() {
311 return global.0.clone();
312 }
313 let entity =
314 cx.new(|_| ApiKeyState::new(MERCURY_CREDENTIALS_URL, MERCURY_TOKEN_ENV_VAR.clone()));
315 cx.set_global(GlobalMercuryApiKey(entity.clone()));
316 entity
317}
318
319pub fn load_mercury_api_token(cx: &mut App) -> Task<Result<(), language_model::AuthenticateError>> {
320 mercury_api_token(cx).update(cx, |key_state, cx| {
321 key_state.load_if_needed(MERCURY_CREDENTIALS_URL, |s| s, cx)
322 })
323}