git major minor commits tag script

git-mmctag

#!/usr/bin/env bash

# For projects that follow the version scheme MAJOR.MINOR.COMMITS where MAJOR
# and MINOR provide some relative indication of the size of the change, but do
# not follow semantic versioning. In general, all changes endeavor to be
# non-breaking (by moving to new names rather than by breaking existing
# names).  COMMITS is an ever-increasing counter of commits since the
# beginning of this repository.

# Just put this file into your $PATH somewhere, e.g., `~/bin` then use
# `git mmctag` to invoke it (note no hyphen when invoking it via git!)

version_type=${1:-commits}

existing_tag=$( git describe --abbrev=0 --match="*" 2>/dev/null || echo "0.0.0" )
total_commits=$( git rev-list --count HEAD )

echo existing tag "'${existing_tag}'"

case "$version_type" in
    ma|maj|major)
        new_tag=$(echo $existing_tag | awk -F. -vOFS=. -vtotal_commits=$total_commits '{$1+=1;$2=0;$3=total_commits}1')
        ;;
    mi|min|minor)
        new_tag=$(echo $existing_tag | awk -F. -vOFS=. -vtotal_commits=$total_commits '{$2+=1;$3=total_commits}1')
        ;;
    c|com|commits)
        new_tag=$(echo $existing_tag | awk -F. -vOFS=. -vtotal_commits=$total_commits '{$3=total_commits}1')
        ;;
    *)
        echo Version type "${version_type}" not known, expected major/minor
        exit 1
        ;;
esac

echo creating new tag "'$new_tag'"

git tag $new_tag -m "release ${new_tag}"