[PATCH v3 0/8] parseopt: add subcommand autocorrection

Git currently provides auto-correction for builtins and aliases, but lacks this functionality for subcommands parsed via the parse-options API. Subcommands are also commands, and typos will occur, too. Like:

	git remote add-rul

So, this series introduces subcommand auto-correction.

By default, this implementation enables autocorrection for builtins with mandatory subcommands. However, for those using PARSE_OPT_SUBCOMMAND_OPTIONAL, autocorrection is skipped to avoid misinterpreting legitimate unknown arguments as mistyped subcommands.

To allow builtins with optional subcommands to explicitly opt in, this series adds the PARSE_OPT_SUBCOMMAND_AUTOCORR flag. This flag is subsequently enabled for git-remote and git-notes.

Additionally, the existing autocorrection logic is extracted from help.c so subcommand handling can reuse the same config parsing and prompt/delay logic.

Some split string literals are also combined so the full text is easier to grep for.

Changes in v3:
  - Align with the coding guildline

Changes in v2:
  - Reword the explanation of default autocorrection behavior

Jiamu Sun (8):
  parseopt: extract subcommand handling from parse_options_step()
  help: make autocorrect handling reusable
  help: move tty check for autocorrection to autocorrect.c
  autocorrect: rename AUTOCORRECT_SHOW to AUTOCORRECT_HINTONLY
  autocorrect: provide config resolution API
  parseopt: autocorrect mistyped subcommands
  parseopt: enable subcommand autocorrection for git-remote and
    git-notes
  help: add tests for subcommand autocorrection

 Makefile                          |   1 +
 autocorrect.c                     |  89 +++++++++++++++++
 autocorrect.h                     |  21 ++++
 builtin/notes.c                   |  10 +-
 builtin/remote.c                  |  12 +--
 help.c                            | 104 ++++----------------
 parse-options.c                   | 156 ++++++++++++++++++++++--------
 parse-options.h                   |   1 +
 t/t9004-autocorrect-subcommand.sh |  51 ++++++++++
 9 files changed, 305 insertions(+), 140 deletions(-)
 create mode 100644 autocorrect.c
 create mode 100644 autocorrect.h
 create mode 100755 t/t9004-autocorrect-subcommand.sh

base-commit: 795c338de725e13bd361214c6b768019fc45a2c1