Function parseUnifiedDiff

shared/utils/diff.ts:166–295

(
  diffText: string,
  options: Partial<ParseOptions> = {},
)

}

export function parseUnifiedDiff(
  diffText: string,
  options: Partial<ParseOptions> = {},
): FileDiff[] {
  const opts = { ...defaultOptions, ...options }
  const files: FileDiff[] = []

  const lines = diffText.split('\n')
  let currentFile: FileDiff | null = null
  let currentHunk: {
    changes: RawChange[]
    oldStart: number
    oldLines: number
    newStart: number
    newLines: number
    content: string
  } | null = null
  let oldLine = 0
  let newLine = 0

  // Track old path from --- line to detect /dev/null (new/deleted files)
  let lastOldPath = ''

  for (const line of lines) {
    if (line.startsWith('---')) {
      if (currentHunk && currentFile) {
        const hunk = processHunk(currentHunk, opts)
        currentFile.hunks.push(hunk)
      }
      currentHunk = null
      const oldMatch = line.match(/^--- (?:a\/)?(.*)/)
      lastOldPath = oldMatch?.[1]?.trimEnd() ?? ''
      continue
    }

    if (line.startsWith('+++')) {
      const match = line.match(/^\+\+\+ (?:b\/)?(.*)/)
      const path = match?.[1]?.trimEnd() ?? ''

      if (currentFile && currentHunk) {
        const hunk = processHunk(currentHunk, opts)
        currentFile.hunks.push(hunk)
        files.push(currentFile)
      } else if (currentFile) {
        files.push(currentFile)
      }

      // Determine file type from --- / +++ paths:
      // /dev/null in the old path means a new file; in the new path means deleted
      let fileType: FileDiff['type'] = 'modify'
      if (lastOldPath === '/dev/null') fileType = 'add'
      else if (path === '/dev/null') fileType = 'delete'

      currentFile = {
        oldPath: lastOldPath === '/dev/null' ? path : lastOldPath || path,
        newPath: path,
        type: fileType,
        hunks: [],