Function parseGitDiff

source code/utils/gitDiff.ts:202–300

(
  stdout: string,
)

 * - Files ≤1MB: parsed but limited to MAX_LINES_PER_FILE lines
 */
export function parseGitDiff(
  stdout: string,
): Map<string, StructuredPatchHunk[]> {
  const result = new Map<string, StructuredPatchHunk[]>()
  if (!stdout.trim()) return result

  // Split by file diffs
  const fileDiffs = stdout.split(/^diff --git /m).filter(Boolean)

  for (const fileDiff of fileDiffs) {
    // Stop after MAX_FILES
    if (result.size >= MAX_FILES) break

    // Skip files larger than 1MB
    if (fileDiff.length > MAX_DIFF_SIZE_BYTES) {
      continue
    }

    const lines = fileDiff.split('\n')

    // Extract filename from first line: "a/path/to/file b/path/to/file"
    const headerMatch = lines[0]?.match(/^a\/(.+?) b\/(.+)$/)
    if (!headerMatch) continue
    const filePath = headerMatch[2] ?? headerMatch[1] ?? ''

    // Find and parse hunks
    const fileHunks: StructuredPatchHunk[] = []
    let currentHunk: StructuredPatchHunk | null = null
    let lineCount = 0

    for (let i = 1; i < lines.length; i++) {
      const line = lines[i] ?? ''

      // StructuredPatchHunk header: @@ -oldStart,oldLines +newStart,newLines @@
      const hunkMatch = line.match(
        /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/,
      )
      if (hunkMatch) {
        if (currentHunk) {
          fileHunks.push(currentHunk)
        }
        currentHunk = {
          oldStart: parseInt(hunkMatch[1] ?? '0', 10),
          oldLines: parseInt(hunkMatch[2] ?? '1', 10),
          newStart: parseInt(hunkMatch[3] ?? '0', 10),
          newLines: parseInt(hunkMatch[4] ?? '1', 10),
          lines: [],
        }
        continue
      }

      // Skip binary file markers and other metadata
      if (
        line.startsWith('index ') ||
        line.startsWith('---') ||
        line.startsWith('+++') ||
        line.startsWith('new file') ||
        line.startsWith('deleted file') ||