Provide some lefthook env vars to the running command

[jcook-uptycs]

It would be helpful to have lefthook pass some lefthook related env vars to the command.

The first examples I have include

• LEFTHOOK_HOOK the hook that is running (ie pre-commit, commit-msg)
• LEFTHOOK_COMMAND the name/key of the command being run

[mrexox]

Hey! I think that you can use more explicit env option, so you always know where the ENV comes from.

[jcook-uptycs]

Here is a sample example. I find I am using the command name (ex goimports) often in a log file.

pre-commit:
  commands:

    goimports:
      glob: "{*.go}"
      env:
        GIT_PAGER: cat
      run: |
        go run golang.org/x/tools/cmd/goimports@latest -l -e -w {files}
        git diff {files} > goimports.diff
        git diff-files --quiet {files} ## fail if diff

This could be used like either of these.

git diff {files} > {name}.diff
git diff {files} > ${LEFTHOOK_COMMAND}.diff

I understand my use case may be odd.

Thanks