[PATCH v4 0/5] submodule: parallelize diff

Original cover letter for context: https://lore.kernel.org/git/20221011232604.839941-1-calvinwan@google.com/

Changes since v3

Renamed pipe_output_fn to duplicate_output_fn and now passes an additional "strbuf* out" parameter. Output is directly duplicated to that function rather than held in a separate variable. Slightly rewrote the tests to more accurately capture the expected output of duplicate_output_fn.

Removed a patch that added an option to hide child process output. Child process output is now reset in status_duplicate_output.

More style changes as suggested by Avar

Calvin Wan (5):
  run-command: add duplicate_output_fn to run_processes_parallel_opts
  submodule: strbuf variable rename
  submodule: move status parsing into function
  diff-lib: refactor match_stat_with_submodule
  diff-lib: parallelize run_diff_files for submodules

 Documentation/config/submodule.txt |  12 ++
 diff-lib.c                         | 103 +++++++++++--
 run-command.c                      |  13 +-
 run-command.h                      |  24 +++
 submodule.c                        | 229 +++++++++++++++++++++++++----
 submodule.h                        |   9 ++
 t/helper/test-run-command.c        |  21 +++
 t/t0061-run-command.sh             |  39 +++++
 t/t4027-diff-submodule.sh          |  19 +++
 t/t7506-status-submodule.sh        |  19 +++
 10 files changed, 441 insertions(+), 47 deletions(-)