/**
* Extract commit information and diffs from git repositories.
*/
import { simpleGit, SimpleGit } from 'simple-git';
import * as path from 'path';
import { CommitInfo, FileChange, DiffInfo } from '../types/analysis.js';
/**
* Extract detailed information about a specific commit.
*/
export async function extractCommitInfo(
repoPath: string,
commitHash: string
): Promise<CommitInfo> {
const git = simpleGit(repoPath);
// Get commit details
const log = await git.show([commitHash, "--stat", "--format=%H%n%an%n%ai%n%s%n%b"]);
const diff = await git.show([commitHash, "--unified=3"]);
// Parse commit info
const lines = log.split('\n');
const commitInfo: CommitInfo = {
hash: lines[0],
author: lines[1],
date: lines[2],
message: lines.slice(3).join('\n').trim(),
files: [],
};
// Check if this is the initial commit
const parents = await git.raw(['rev-list', '--parents', '-n', '1', commitHash]);
const isInitialCommit = parents.split(' ').length === 1;
if (isInitialCommit) {
// For initial commit, all files are additions
const files = await git.show([commitHash, '--pretty=format:', '--name-only']);
commitInfo.files = files.split('\n').filter(f => f).map(f => ({
path: f,
status: 'added',
additions: 0, // Not easily available for initial commit
deletions: 0,
diff: extractFileDiff(diff, f)
}));
} else {
// For normal commits, use diff summary
const diffSummary = await git.diffSummary([`${commitHash}^`, commitHash]);
commitInfo.files = diffSummary.files.map(file => {
if ('insertions' in file && 'deletions' in file) {
return {
path: file.file,
status: getFileStatus(file),
additions: file.insertions,
deletions: file.deletions,
diff: extractFileDiff(diff, file.file),
};
}
return {
path: file.file,
status: 'binary',
additions: 0,
deletions: 0,
diff: ''
};
});
}
return commitInfo;
}
/**
* Determine file status from diff summary.
*/
function getFileStatus(file: any): "added" | "modified" | "deleted" | "binary" {
if (file.binary) return "binary";
if (file.insertions > 0 && file.deletions === 0) return "added";
if (file.insertions === 0 && file.deletions > 0) return "deleted";
return "modified";
}
/**
* Extract diff for a specific file from full diff output.
*/
function extractFileDiff(fullDiff: string, filePath: string): string {
const fileMarker = `diff --git a/${filePath}`;
const startIdx = fullDiff.indexOf(fileMarker);
if (startIdx === -1) return "";
const nextFileIdx = fullDiff.indexOf("diff --git", startIdx + 1);
return nextFileIdx === -1
? fullDiff.slice(startIdx)
: fullDiff.slice(startIdx, nextFileIdx);
}
