[PATCH v3 00/12] Finish converting git bisect to C part 2

These patches correspond to a second part of patch series of Outreachy project "Finish converting `git bisect` from shell to C" started by Pranit Bauva and Tanushree Tumane (https://public-inbox.org/git/pull.117.git.gitgitgadget@gmail.com) and continued by me.

These patch series emails were generated from: https://gitlab.com/mirucam/git/commits/git-bisect-work-part2-v3.

I would like to thank Junio Hamano for reviewing this patch series and Christian Couder for his help.

--- Changes since v2 Finish converting git bisect to C part 2 patch series ---

General changes ---------------

* Rebase on master branch: efe3874640 (Sync with v2.26.1, 2020-04-13)

Specific changes ----------------

[1/12] bisect--helper: fix `cmd_*()` function switch default return

* Use `BUG()` instead of `return error()` in default switch.

--

[2/12] bisect--helper: use '-res' in 'cmd_bisect__helper' return

* New patch: use '-res' instead of 'abs(res)'.

--

[3/12] bisect--helper: introduce new `write_in_file()` function

* Rename input parameter `filepath` to `path`.
* Change `error_errno()` to `error()` in mode checking.
* Change error message when file cannot be opened.
* Add `fclose()` before error return.

--

[4/12] bisect--helper: reimplement `bisect_autostart` shell function in C

* Reorder patch before `reimplement `bisect_next` and `bisect_auto_next`
shell functions in C` to use `bisect_autostart()` function in 
`bisect_append_log_quoted()`.

-- ` [5/12] bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell functions in C

* Amend commit message.
* Add `clear_commit_marks()` at the end of bisect_next_all() and remove it from 
`bisect_rev_setup()`.
* Fix if condition.
* Add `bisect_autostart()` in `bisect_append_log_quoted()`.
* Check `git_path_bisect_head()` with `file_exist()` instead of 
`is_empty_or_missing_file()`.
* Fix return with BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND.
* Add conversion in `cmd_*()` to BISECT_OK when return is 
BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND.

* Note to previous reviewer: suggestion to change `bisect_auto_next()` function
to return void cannot be done because errors from `bisect_next()` are not 
ignored.

--

[5/12] bisect--helper: reimplement `bisect_state` & `bisect_head` shell functions in C

* Check `git_path_bisect_head()` with `file_exist()` instead of 
`is_empty_or_missing_file()`.

--

Miriam Rubio (3):
  bisect--helper: fix `cmd_*()` function switch default return
  bisect--helper: use '-res' in 'cmd_bisect__helper' return
  bisect--helper: introduce new `write_in_file()` function

Pranit Bauva (9):
  bisect--helper: reimplement `bisect_autostart` shell function in C
  bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell
    functions in C
  bisect--helper: finish porting `bisect_start()` to C
  bisect--helper: retire `--bisect-clean-state` subcommand
  bisect--helper: retire `--next-all` subcommand
  bisect--helper: reimplement `bisect_state` & `bisect_head` shell
    functions in C
  bisect--helper: retire `--check-expected-revs` subcommand
  bisect--helper: retire `--write-terms` subcommand
  bisect--helper: retire `--bisect-autostart` subcommand

 bisect.c                 |   8 +
 builtin/bisect--helper.c | 383 +++++++++++++++++++++++++++++++++------
 git-bisect.sh            | 145 +--------------
 3 files changed, 347 insertions(+), 189 deletions(-)