Karthik Nayak [off-list ref] writes:

Similar to the earlier patch series on cleaning up packfile.c and
removing usage of global variables [1], we change the midx.c and
midx-write.c files to no longer use global variables.

This is done by the following:
  - Usage of repository variable already available in existing structs.
  - Passing down repository variable from other subsystems.
  - Modifying all subcommands to obtain repository variable from the
  command in `builtins/` and passing down the variable from there.

The biggest change is in the first commit, wherein we modify all
subcommands to add the repository variable. Since the subcommand
definition are not often changed, it shouldn't cause too many conflicts
with in flight topics.

Since the `packfile.c` cleanup is still in flight, this series is based
on top of master: b31fb630c0 (Merge https://github.com/j6t/git-gui,
2024-11-11) with those patches merged in.

There are some topics in `seen` which would conflict with this series. I
think the fixes should generally be trivial and I'll try and iron them
out in the next version.