Function parseRawDiffToToolUseDiff

source code/utils/gitDiff.ts:450–483

* Parse raw unified diff output into the structured ToolUseDiff format. * Extracts only the hunk content (starting from @@) as the patch, * and counts additions/deletions.

(
  filename: string,
  rawDiff: string,
  status: 'modified' | 'added',
)

 * and counts additions/deletions.
 */
function parseRawDiffToToolUseDiff(
  filename: string,
  rawDiff: string,
  status: 'modified' | 'added',
): Omit<ToolUseDiff, 'repository'> {
  const lines = rawDiff.split('\n')
  const patchLines: string[] = []
  let inHunks = false
  let additions = 0
  let deletions = 0

  for (const line of lines) {
    if (line.startsWith('@@')) {
      inHunks = true
    }
    if (inHunks) {
      patchLines.push(line)
      if (line.startsWith('+') && !line.startsWith('+++')) {
        additions++
      } else if (line.startsWith('-') && !line.startsWith('---')) {
        deletions++
      }
    }
  }

  return {
    filename,
    status,
    additions,
    deletions,
    changes: additions + deletions,
    patch: patchLines.join('\n'),
  }
}

/**
 * Determine the best ref to diff against for a PR-like diff.