When git status runs in a repo with submodules, it'll recursively run
git status in every submodule as well by default (sequentially).
git status is substantially slower on Windows than on Linux. git diff
behaves similarly to git status in terms of running recursively within
all submodules. In repos with hundreds of submodules, this quickly adds
up when git status/diff are called multiple times. Pre-commit runs
git status once at the beginning of an operation and then runs git diff
before and after each hook. These calls quickly add up and make
pre-commit unusable in large repos with lots of submodules.
This commit drastically improves performance in repos with lots of
submodules and fixes#1701 by telling git status and git diff to ignore
submodules. This change is not expected to have any negative effect on
existing hooks because each submodule should manage its own hooks
instead of relying on superproject hooks to manipulate their contents.
If using the prepare-commit-msg and commit-msg stages specifically (such
as with the try-repo command), the `--commit-msg-filename` arg must be
provided.
[fixes#1336]
chore: improve error message for hook stage check
Adds a prepare-commit-msg hook stage which allows for hooks which add
dynamic suggested/placeholder text to commit messages that an author can
use as a starting point for writing a commit message
Before there was a `getcwd` syscall for every filename which was filtered.
Instead this is now cached per-run.
- When all files are identified by filename only: ~45% improvement
- When no files are identified by filename only: ~55% improvement
This makes little difference to overall execution, the bigger win is
eliminating the `memoize_by_cwd` hack. Just removing the memoization would
have *increased* the runtime by 300-500%.
