Function parsePatchLines

src/patch/parse.ts:150–299

(
  lines: string[],
  { supportLegacyDiffs }: { supportLegacyDiffs: boolean },
)

}

function parsePatchLines(
  lines: string[],
  { supportLegacyDiffs }: { supportLegacyDiffs: boolean },
): FileDeets[] {
  const result: FileDeets[] = []
  let currentFilePatch: FileDeets = emptyFilePatch()
  let state: State = "parsing header"
  let currentHunk: Hunk | null = null
  let currentHunkMutationPart: PatchMutationPart | null = null
  let hunkStartLineIndex = 0

  function commitHunk(i: number) {
    if (currentHunk) {
      if (currentHunkMutationPart) {
        currentHunk.parts.push(currentHunkMutationPart)
        currentHunkMutationPart = null
      }
      currentHunk.source = lines.slice(hunkStartLineIndex, i).join("\n")
      currentFilePatch.hunks!.push(currentHunk)
      currentHunk = null
    }
  }

  function commitFilePatch(i: number) {
    commitHunk(i)
    result.push(currentFilePatch)
    currentFilePatch = emptyFilePatch()
  }

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i]

    if (state === "parsing header") {
      if (line.startsWith("@@")) {
        hunkStartLineIndex = i
        state = "parsing hunks"
        currentFilePatch.hunks = []
        i--
      } else if (line.startsWith("diff --git ")) {
        if (currentFilePatch && currentFilePatch.diffLineFromPath) {
          commitFilePatch(i)
        }
        const match = line.match(/^diff --git a\/(.*?) b\/(.*?)\s*$/)
        if (!match) {
          throw new Error("Bad diff line: " + line)
        }
        currentFilePatch.diffLineFromPath = match[1]
        currentFilePatch.diffLineToPath = match[2]
      } else if (line.startsWith("old mode ")) {
        currentFilePatch.oldMode = line.slice("old mode ".length).trim()
      } else if (line.startsWith("new mode ")) {
        currentFilePatch.newMode = line.slice("new mode ".length).trim()
      } else if (line.startsWith("deleted file mode ")) {
        currentFilePatch.deletedFileMode = line
          .slice("deleted file mode ".length)
          .trim()
      } else if (line.startsWith("new file mode ")) {
        currentFilePatch.newFileMode = line