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Copy pathgenerateCommitMessageFromGitDiff.ts
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import {
ChatCompletionRequestMessage,
ChatCompletionRequestMessageRoleEnum
} from 'openai';
import { api } from './api';
import { DEFAULT_MODEL_TOKEN_LIMIT, getConfig } from './commands/config';
import { getMainCommitPrompt } from './prompts';
import { mergeDiffs } from './utils/mergeDiffs';
import { tokenCount } from './utils/tokenCount';
const config = getConfig();
const generateCommitMessageChatCompletionPrompt = async (
diff: string
): Promise<Array<ChatCompletionRequestMessage>> => {
const INIT_MESSAGES_PROMPT = await getMainCommitPrompt();
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'
}
const ADJUSTMENT_FACTOR = 20;
export const generateCommitMessageByDiff = async (
diff: string
): Promise<string> => {
try {
const INIT_MESSAGES_PROMPT = await getMainCommitPrompt();
const INIT_MESSAGES_PROMPT_LENGTH = INIT_MESSAGES_PROMPT.map(
(msg) => tokenCount(msg.content) + 4
).reduce((a, b) => a + b, 0);
const MAX_REQUEST_TOKENS =
DEFAULT_MODEL_TOKEN_LIMIT -
ADJUSTMENT_FACTOR -
INIT_MESSAGES_PROMPT_LENGTH -
config?.OCO_OPENAI_MAX_TOKENS;
if (tokenCount(diff) >= MAX_REQUEST_TOKENS) {
const commitMessagePromises = await getCommitMsgsPromisesFromFileDiffs(
diff,
MAX_REQUEST_TOKENS
);
const commitMessages = [];
for (const promise of commitMessagePromises) {
commitMessages.push(await promise);
await delay(2000);
}
return commitMessages.join('\n\n');
}
const messages = await generateCommitMessageChatCompletionPrompt(diff);
const commitMessage = await api.generateCommitMessage(messages);
if (!commitMessage)
throw new Error(GenerateCommitMessageErrorEnum.emptyMessage);
return commitMessage;
} catch (error) {
throw error;
}
};
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 = [];
for (const change of mergedChanges) {
const totalChange = fileHeader + change;
if (tokenCount(totalChange) > maxChangeLength) {
// If the totalChange is too large, split it into smaller pieces
const splitChanges = splitDiff(totalChange, maxChangeLength);
lineDiffsWithHeader.push(...splitChanges);
} else {
lineDiffsWithHeader.push(totalChange);
}
}
const commitMsgsFromFileLineDiffs = lineDiffsWithHeader.map(
async (lineDiff) => {
const messages = await generateCommitMessageChatCompletionPrompt(
separator + lineDiff
);
return api.generateCommitMessage(messages);
}
);
return commitMsgsFromFileLineDiffs;
}
function splitDiff(diff: string, maxChangeLength: number) {
const lines = diff.split('\n');
const splitDiffs = [];
let currentDiff = '';
for (let line of lines) {
// If a single line exceeds maxChangeLength, split it into multiple lines
while (tokenCount(line) > maxChangeLength) {
const subLine = line.substring(0, maxChangeLength);
line = line.substring(maxChangeLength);
splitDiffs.push(subLine);
}
// Check the tokenCount of the currentDiff and the line separately
if (tokenCount(currentDiff) + tokenCount('\n' + line) > maxChangeLength) {
// If adding the next line would exceed the maxChangeLength, start a new diff
splitDiffs.push(currentDiff);
currentDiff = line;
} else {
// Otherwise, add the line to the current diff
currentDiff += '\n' + line;
}
}
// Add the last diff
if (currentDiff) {
splitDiffs.push(currentDiff);
}
return splitDiffs;
}
export const getCommitMsgsPromisesFromFileDiffs = async (
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 = await generateCommitMessageChatCompletionPrompt(
separator + fileDiff
);
commitMessagePromises.push(api.generateCommitMessage(messages));
}
}
return commitMessagePromises;
};
function delay(ms: number) {
return new Promise((resolve) => setTimeout(resolve, ms));
}