[PATCH v3 0/4] completion: make __git_complete public

[Felipe Contreras <felipe.contreras@gmail.com>]

Back in 2012 I argued [1] for the introduction of a helper that would
allow users to specify aliases like:

  git_complete gf git_fetch

There was pushback because there was no clear guideline for public
functions (git_complete vs. _git_complete vs. _GIT_complete), and some
aliases didn't actually work.

Fast-forward to 2020, and there's still no guideline for public
functions, and those aliases still don't work (even though I sent the
fixes).

This has not prevented people from using this function that is clearly
needed to setup custom aliases [2], and in fact that's the recommended
way since there's no other.

But it is cumbersome that the user must type:

  __git_complete gf _git_fetch

Or worse:

  __git_complete gk __gitk_main

8 years is more than enough time to stop waiting for the perfect to
come; let's define a public function (with the same name) that is
actually user-friendly:

  __git_complete gf git_fetch
  __git_complete gk gitk

While also maintaining backwards compatibility.

Changes since v2:

 * Improved the safety of __git_have_func with suggestions from René Scharfe
 * Added documentation to the top of git-completion.bash

[1] https://lore.kernel.org/git/1334524814-13581-1-git-send-email-felipe.contreras@gmail.com/
[2] https://stackoverflow.com/questions/342969/how-do-i-get-bash-completion-to-work-with-aliases

Felipe Contreras (4):
  completion: bash: add __git_have_func helper
  completion: bash: improve function detection
  test: completion: add tests for __git_complete
  completion: add proper public __git_complete

 contrib/completion/git-completion.bash | 50 ++++++++++++++++++++------
 t/t9902-completion.sh                  | 20 +++++++++++
 2 files changed, 60 insertions(+), 10 deletions(-)

Range-diff against v2:
1:  0993732142 = 1:  0993732142 completion: bash: add __git_have_func helper
-:  ---------- > 2:  6a3fe8b79b completion: bash: improve function detection
2:  7918c34d0e = 3:  b211eebc0d test: completion: add tests for __git_complete
3:  8a6cc52063 ! 4:  a5bfe5376b completion: add proper public __git_complete
    @@ Commit message
         Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
     
      ## contrib/completion/git-completion.bash ##
    +@@
    + # tell the completion to use commit completion.  This also works with aliases
    + # of form "!sh -c '...'".  For example, "!sh -c ': git commit ; ... '".
    + #
    ++# If you have a command that is not part of git, but you would still
    ++# like completion, you can use __git_complete:
    ++#
    ++#   __git_complete gl git_log
    ++#
    ++# Or if it's a main command (i.e. git or gitk):
    ++#
    ++#   __git_complete gk gitk
    ++#
    + # Compatible with bash 3.2.57.
    + #
    + # You can set the following environment variables to influence the behavior of
     @@ contrib/completion/git-completion.bash: __git_func_wrap ()
      	$1
      }
-- 
2.30.0