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Copy pathgenerateCommitMessageFromGitDiff.ts
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176 lines (144 loc) · 5.41 KB
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import {
ChatCompletionRequestMessage,
ChatCompletionRequestMessageRoleEnum
} from 'openai';
import { api } from './api';
import { getConfig } from './commands/config';
import { mergeDiffs } from './utils/mergeDiffs';
import { i18n, I18nLocals } from './i18n';
import { tokenCount } from './utils/tokenCount';
const config = getConfig();
const translation = i18n[(config?.language as I18nLocals) || 'en'];
const INIT_MESSAGES_PROMPT: Array<ChatCompletionRequestMessage> = [
{
role: ChatCompletionRequestMessageRoleEnum.System,
// prettier-ignore
content: `You are to act as the author of a commit message in git. Your mission is to create clean and comprehensive commit messages in the conventional commit convention and explain why a change was done. I'll send you an output of 'git diff --staged' command, and you convert it into a commit message.
${config?.emoji? 'Use GitMoji convention to preface the commit.': 'Do not preface the commit with anything.'}
${config?.description ? 'Add a short description of WHY the changes are done after the commit message. Don\'t start it with "This commit", just describe the changes.': "Don't add any descriptions to the commit, only commit message."}
Use the present tense. Lines must not be longer than 74 characters. Use ${translation.localLanguage} to answer.`
},
{
role: ChatCompletionRequestMessageRoleEnum.User,
content: `diff --git a/src/server.ts b/src/server.ts
index ad4db42..f3b18a9 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -10,7 +10,7 @@
import {
initWinstonLogger();
const app = express();
-const port = 7799;
+const PORT = 7799;
app.use(express.json());
@@ -34,6 +34,6 @@
app.use((_, res, next) => {
// ROUTES
app.use(PROTECTED_ROUTER_URL, protectedRouter);
-app.listen(port, () => {
- console.log(\`Server listening on port \${port}\`);
+app.listen(process.env.PORT || PORT, () => {
+ console.log(\`Server listening on port \${PORT}\`);
});`
},
{
role: ChatCompletionRequestMessageRoleEnum.Assistant,
content: `${config?.emoji ? '🐛 ' : ''}${translation.commitFix}
${config?.emoji ? '✨ ' : ''}${translation.commitFeat}
${config?.description ? translation.commitDescription : ''}`
}
];
const generateCommitMessageChatCompletionPrompt = (
diff: string
): Array<ChatCompletionRequestMessage> => {
const chatContextAsCompletionRequest = [...INIT_MESSAGES_PROMPT];
chatContextAsCompletionRequest.push({
role: ChatCompletionRequestMessageRoleEnum.User,
content: diff
});
return chatContextAsCompletionRequest;
};
export enum GenerateCommitMessageErrorEnum {
tooMuchTokens = 'TOO_MUCH_TOKENS',
internalError = 'INTERNAL_ERROR',
emptyMessage = 'EMPTY_MESSAGE'
}
interface GenerateCommitMessageError {
error: GenerateCommitMessageErrorEnum;
}
const INIT_MESSAGES_PROMPT_LENGTH = INIT_MESSAGES_PROMPT.map(
(msg) => tokenCount(msg.content) + 4
).reduce((a, b) => a + b, 0);
const MAX_REQ_TOKENS = 3900 - INIT_MESSAGES_PROMPT_LENGTH;
export const generateCommitMessageWithChatCompletion = async (
diff: string
): Promise<string | GenerateCommitMessageError> => {
try {
if (tokenCount(diff) >= MAX_REQ_TOKENS) {
const commitMessagePromises = getCommitMsgsPromisesFromFileDiffs(
diff,
MAX_REQ_TOKENS
);
const commitMessages = await Promise.all(commitMessagePromises);
return commitMessages.join('\n\n');
} else {
const messages = generateCommitMessageChatCompletionPrompt(diff);
const commitMessage = await api.generateCommitMessage(messages);
if (!commitMessage)
return { error: GenerateCommitMessageErrorEnum.emptyMessage };
return commitMessage;
}
} catch (error) {
return { error: GenerateCommitMessageErrorEnum.internalError };
}
};
function getMessagesPromisesByChangesInFile(
fileDiff: string,
separator: string,
maxChangeLength: number
) {
const hunkHeaderSeparator = '@@ ';
const [fileHeader, ...fileDiffByLines] = fileDiff.split(hunkHeaderSeparator);
// merge multiple line-diffs into 1 to save tokens
const mergedChanges = mergeDiffs(
fileDiffByLines.map((line) => hunkHeaderSeparator + line),
maxChangeLength
);
const lineDiffsWithHeader = mergedChanges.map(
(change) => fileHeader + change
);
const commitMsgsFromFileLineDiffs = lineDiffsWithHeader.map((lineDiff) => {
const messages = generateCommitMessageChatCompletionPrompt(
separator + lineDiff
);
return api.generateCommitMessage(messages);
});
return commitMsgsFromFileLineDiffs;
}
export function getCommitMsgsPromisesFromFileDiffs(
diff: string,
maxDiffLength: number
) {
const separator = 'diff --git ';
const diffByFiles = diff.split(separator).slice(1);
// merge multiple files-diffs into 1 prompt to save tokens
const mergedFilesDiffs = mergeDiffs(diffByFiles, maxDiffLength);
const commitMessagePromises = [];
for (const fileDiff of mergedFilesDiffs) {
if (tokenCount(fileDiff) >= maxDiffLength) {
// if file-diff is bigger than gpt context — split fileDiff into lineDiff
const messagesPromises = getMessagesPromisesByChangesInFile(
fileDiff,
separator,
maxDiffLength
);
commitMessagePromises.push(...messagesPromises);
} else {
const messages = generateCommitMessageChatCompletionPrompt(
separator + fileDiff
);
commitMessagePromises.push(api.generateCommitMessage(messages));
}
}
return commitMessagePromises;
}