feat: add git operations for fetching bulk blame for file

Author: mishraprafful

src/git.ts

@@ -0,0 +1,93 @@
+import { exec } from 'child_process';
+
+export interface CommitInfo {
+  commitHash: string;
+  author: string;
+  lineNumber: number;
+  commitTitle: string;
+}
+
+export function fetchFileBlame(file: string): Promise<CommitInfo[]> {
+  return new Promise<CommitInfo[]>((resolve, reject) => {
+    // Run git blame
+    exec(`git blame -w ${file}`, async (error, stdout, stderr) => {
+      if (error) {
+        console.error(`Error executing git blame: ${error.message}`);
+        reject(error.message);
+        return;
+      }
+
+      const commitInfos: CommitInfo[] = [];
+      const commitHashes = new Set<string>();
+
+      stdout.split('\n').forEach(line => {
+        if (line.trim() === '') {
+          return;
+        }
+
+        const match = line.match(/^([^\s]+) \(([^)]+)\s+(\d+)\) .*/);
+        if (match) {
+          const commitHash = match[1];
+          const authorInfo = match[2];
+          const lineNumber = parseInt(match[3], 10);
+
+          // Extract the author's name from authorInfo
+          const authorName = authorInfo.split(' ').slice(0, -3).join(' ');
+
+          commitHashes.add(commitHash);
+
+          commitInfos.push({
+            commitHash,
+            author: authorName,
+            lineNumber,
+            commitTitle: '', // Placeholder for commit title
+          });
+        } else {
+          console.warn(`Unexpected format for line: ${line}`);
+        }
+      });
+
+      // Fetch commit titles for the found commit hashes
+      try {
+        const commitTitles = await fetchCommitTitles(Array.from(commitHashes));
+
+        // Assign commit titles to commitInfos
+        commitInfos.forEach(info => {
+          if (commitTitles.has(info.commitHash)) {
+            info.commitTitle = commitTitles.get(info.commitHash) || '';
+          }
+        });
+
+        resolve(commitInfos);
+      } catch (fetchError) {
+        reject(`Error fetching commit titles: ${fetchError}`);
+      }
+    });
+  });
+}
+
+// Function to fetch commit titles from commit hashes using git log
+ function fetchCommitTitles(commitHashes: string[]): Promise<Map<string, string>> {
+  return new Promise<Map<string, string>>((resolve, reject) => {
+    const gitLogCommand = `git log --format="%H %s" ${commitHashes.join(' ')}`;
+
+    exec(gitLogCommand, (error, stdout, stderr) => {
+      if (error) {
+        reject(`Error executing git log: ${error.message}`);
+        return;
+      }
+
+      const commitTitles = new Map<string, string>();
+
+      stdout.split('\n').forEach(line => {
+        if (line.trim() !== '') {
+          const [commitHash, ...titleParts] = line.trim().split(' ');
+          const commitTitle = titleParts.join(' ');
+          commitTitles.set(commitHash, commitTitle);
+        }
+      });
+
+      resolve(commitTitles);
+    });
+  });
+}