Bits of reusable Git and GitHub shell functions.
Source the lib/git-nubs.sh library, then call its functions from your scripts.
E.g.,
$ . path/to/sh-git-nubs/lib/git-nubs.sh
$ git_branch_exists "branch-name" || >&2 echo "No such branch"
No such branch
$ git_branch_name
some-branch
$ git_remote_exists "remote-name" || >&2 echo "No such remote"
No such remote
$ git_remote_branch_exists "some-remote" "some-branch" && echo "It does exist!"
It does exist!
$ git_insist_git_repo || >&2 echo "This is not a repo!"
$ git_insist_pristine || >&2 echo "Your working directory has WORK!"
$ git_versions_tagged_for_commit_object $(git rev-parse HEAD)
0.0.1
$ git_last_version_tag_describe
0.0.1
$ git_since_git_init_commit_epoch_ts
1450540432
$ git_since_latest_version_tag_epoch_ts
1547432645
$ git_since_most_recent_commit_epoch_ts
1687439645