Function maybeParseApplyPatch

packages/arctic/src/patch/index.ts:238–292

(
    argv: string[],
  )

  // Apply patch functionality
  export function maybeParseApplyPatch(
    argv: string[],
  ):
    | { type: MaybeApplyPatch.Body; args: ApplyPatchArgs }
    | { type: MaybeApplyPatch.PatchParseError; error: Error }
    | { type: MaybeApplyPatch.NotApplyPatch } {
    const APPLY_PATCH_COMMANDS = ["apply_patch", "applypatch"]

    // Direct invocation: apply_patch <patch>
    if (argv.length === 2 && APPLY_PATCH_COMMANDS.includes(argv[0])) {
      try {
        const { hunks } = parsePatch(argv[1])
        return {
          type: MaybeApplyPatch.Body,
          args: {
            patch: argv[1],
            hunks,
          },
        }
      } catch (error) {
        return {
          type: MaybeApplyPatch.PatchParseError,
          error: error as Error,
        }
      }
    }

    // Bash heredoc form: bash -lc 'apply_patch <<"EOF" ...'
    if (argv.length === 3 && argv[0] === "bash" && argv[1] === "-lc") {
      // Simple extraction - in real implementation would need proper bash parsing
      const script = argv[2]
      const heredocMatch = script.match(/apply_patch\s*<<['"](\w+)['"]\s*\n([\s\S]*?)\n\1/)

      if (heredocMatch) {
        const patchContent = heredocMatch[2]
        try {
          const { hunks } = parsePatch(patchContent)
          return {
            type: MaybeApplyPatch.Body,
            args: {
              patch: patchContent,
              hunks,
            },
          }
        } catch (error) {
          return {
            type: MaybeApplyPatch.PatchParseError,
            error: error as Error,
          }
        }
      }
    }

    return { type: MaybeApplyPatch.NotApplyPatch }
  }

  // File content manipulation
  interface ApplyPatchFileUpdate {