[PATCH 1/3] completion: put matching ctags symbol names directly into COMPREPLY

The one-liner awk script in __git_match_ctag() listing ctags symbol names for 'git grep <TAB>' is already smart enough to list only symbol names matching the current word to be completed.

Extend this helper function to accept prefix and suffix parameters to be prepended and appended, respectively, to each listed symbol name in the awk script, so its output won't require any additional processing or filtering in the completion script before being handed over to Bash. Use the faster __gitcomp_direct() helper instead of __gitcomp_nl() to fill the fully processed matching symbol names into Bash's COMPREPLY array.

Right after 'git grep <TAB>' in current git.git with 14k+ symbol names in the tag file, best of five:

  Before:

    $ time __gitcomp_nl "$(__git_match_ctag "" tags)"

    real    0m0.178s
    user    0m0.176s
    sys     0m0.000s

  After:

    $ time __gitcomp_direct "$(__git_match_ctag "" tags "" " ")"

    real    0m0.058s
    user    0m0.048s
    sys     0m0.008s

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---

Notes:
    It's still just a simple linear search through the tags file, so there
    are no miracles: it's still hopelessly, unusably slow e.g. in the
    Linux repository.

 contrib/completion/git-completion.bash | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)