[PATCH] test-lib-functions: fix test_subcommand_inexact

From: Derrick Stolee <derrickstolee@github.com>

The implementation of test_subcommand_inexact() was originally introduced in e4d0c11c0 (repack: respect kept objects with '--write-midx -b', 2021-12-20) with the intention to allow finding a subcommand based on an initial set of arguments. The inexactness was intended as a way to allow flexible options beyond that initial set, as opposed to test_subcommand() which requires that the full list of options is provided in its entirety.

The implementation began by copying test_subcommand() and replaced the repeated argument 'printf' statement to append ".*" instead of "," to each argument. This has a few drawbacks:

1. Most importantly, this repeats the use of ".*" within 'expr', so the
   inexact match is even more flexible than expected. It allows the list
   of arguments to exist as a subsequence (with any other items included
   between those arguments).

2. The line 'expr="$(expr%,}"' that previously removed a trailing comma
   now no longer does anything, since the string ends with ".*".

Both of these issues are fixed by keeping the addition of the comma in the printf statement, then adding ".*" after stripping out the trailing comma.

All existing tests continue to pass with this change, since none of them were taking advantage of this unintended flexibility.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
---
    test-lib-functions: fix test_subcommand_inexact
    
    This fixes a concern discovered by Junio in [1].
    
    [1] https://lore.kernel.org/git/xmqq4k41vdwe.fsf@gitster.g/
    
    Thanks, -Stolee

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1185%2Fderrickstolee%2Ftest-subcommand-fix-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1185/derrickstolee/test-subcommand-fix-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1185

 t/test-lib-functions.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)