feat: AI Codebase Doc Drift Detector CLI v0.1.0

src/git-tracker.ts

@@ -0,0 +1,43 @@
+/**
+ * Git Tracker — discover changed files via git.
+ */
+import { execSync } from 'node:child_process';
+
+export function getGitRoot(cwd: string): string | null {
+  try {
+    return execSync('git rev-parse --show-toplevel', { cwd, encoding: 'utf-8' }).trim();
+  } catch {
+    return null;
+  }
+}
+
+export function getChangedFiles(cwd: string, sinceRef?: string): string[] {
+  try {
+    const cmd = sinceRef
+      ? `git diff --name-only ${sinceRef} --`
+      : 'git diff --name-only HEAD~1 --';
+    const out = execSync(cmd, { cwd, encoding: 'utf-8' }).trim();
+    if (!out) return [];
+    return out.split('\n').filter(Boolean);
+  } catch {
+    return [];
+  }
+}
+
+export function getAllTrackedFiles(cwd: string): string[] {
+  try {
+    const out = execSync('git ls-files', { cwd, encoding: 'utf-8' }).trim();
+    if (!out) return [];
+    return out.split('\n').filter(Boolean);
+  } catch {
+    return [];
+  }
+}
+
+export function getLastCommitDate(cwd: string): string | null {
+  try {
+    return execSync('git log -1 --format=%cI', { cwd, encoding: 'utf-8' }).trim();
+  } catch {
+    return null;
+  }
+}