[PATCH 0/4] Replace use of `test <expr> -o/a <expr>`

Hi,

this patch series replaces all uses of `test <expr> -o/a <expr>` that I was able to find in our codebase. This is in accordance to our coding guidelines:

 - We do not write our "test" command with "-a" and "-o" and use "&&"
   or "||" to concatenate multiple "test" commands instead, because
   the use of "-a/-o" is often error-prone.  E.g.

     test -n "$x" -a "$a" = "$b"

   is buggy and breaks when $x is "=", but

     test -n "$x" && test "$a" = "$b"

   does not have such a problem.

This patch series is a result of the discussion at [1].

Patrick

[1]: <20231109073250.GA2698227@coredump.intra.peff.net>

Patrick Steinhardt (4):
  global: convert trivial usages of `test <expr> -a/-o <expr>`
  contrib/subtree: stop using `-o` to test for number of args
  contrib/subtree: convert subtree type check to use case statement
  Makefile: stop using `test -o` when unlinking duplicate executables

 GIT-VERSION-GEN                |  2 +-
 Makefile                       |  2 +-
 configure.ac                   |  2 +-
 contrib/subtree/git-subtree.sh | 34 +++++++++++++++++++++++-----------
 t/perf/perf-lib.sh             |  2 +-
 t/perf/run                     |  9 +++++----
 t/valgrind/valgrind.sh         |  2 +-
 7 files changed, 33 insertions(+), 20 deletions(-)