.githook.post-commit

#!/bin/bash
set -eo pipefail

# (Re-)Assigns git tags based on version in pyproject.toml file, logs action to stdout
# Current git doesn't have option to auto-push tags, so there's pre-push hook for that too
# (--follow-tags seem to only extend to annotated tags, which these aren't)

die() {
	echo >&2 $'\ngit-post-commit :: ----------------------------------------'
	echo >&2 "git-post-commit :: ERROR: $@"
	echo >&2 $'git-post-commit :: ----------------------------------------\n'; exit 1; }

ver=$( git show --no-color --diff-filter=M -aU0 pyproject.toml |
		gawk '/^\+version\s*=/ {
			split(substr($NF,2,length($NF)-2),v,".")
			print v[1]+0 "." v[2]+0 "." v[3]+0}' )

[[ "$ver" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || {
	ver=$( gawk '/^version\s*=/ {
		split(substr($NF,2,length($NF)-2),v,".")
		print v[1]+0 "." v[2]+0 "." v[3]+0}' pyproject.toml )
	[[ "$ver" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || \
		die 'Failed to get version from git-show and pyproject.toml file'
	ver_tag=$(git tag --sort=v:refname | tail -1)
	[[ -n "$ver" && "$ver" = "$ver_tag" ]] || die 'No new release to tag,'`
		`" and last git-tag [ $ver_tag ] does not match pyproject.toml version [ $ver ]"
	echo $'\ngit-post-commit :: no new tag, last one matches pyproject.toml\n'; exit 0; }

git tag -f "$ver" HEAD # can be reassigning tag after --amend
echo -e "\ngit-post-commit :: tagged new release [ $ver ]\n"