Semantic Versioning Helper for CI

semver.sh

#!/bin/bash

# Semantic Versioning Helper for CI 
# Created by Paul Hatcherian

# Usage:
# Use the phrase "(FEATURE)" and "(BREAKING)" in commit messages to
# indicate changes as needed.
# Use 'full', 'ver', or 'ci' to generate version types from git. Tag using
# the version number to begin next version.


# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

declare TAG=$(git describe --abbrev=0)
declare LOG=$(git log --pretty="format:%s" --tags ${TAG}..HEAD)
declare FEATURE_COUNT=$(echo "${LOG}" | grep -c "(FEATURE)")
declare BREAKING_COUNT=$(echo "${LOG}" | grep -c "(BREAKING)")
declare TYPE
declare REV
declare NEXT

# If no previous tags then this is the first release
if [ -z "$TAG" ] ; then
  NEXT=0.0.0
  TYPE=NEW
  REV=0
else

  declare P=( ${TAG//./ } )

  if [ $BREAKING_COUNT -ne 0 ] ; then
    TYPE=MAJOR
    REV=$(echo "${LOG%(BREAKING)*}" | wc -l | xargs echo)
    ((P[0]++))
    P[1]=0
    P[2]=0
  elif [ $FEATURE_COUNT -ne 0 ] ; then
    TYPE=MINOR
    REV=$(echo "${LOG%(FEATURE)*}" | wc -l | xargs echo)
    ((P[1]++))
    P[2]=0
  else
    TYPE=PATCH
    REV=$(git rev-list ${TAG}..HEAD --count)
    ((P[2]++))
  fi

  NEXT=${P[0]}.${P[1]}.${P[2]}
fi

case $1 in
  "next")
    echo ${NEXT}
    ;;
  "full")
    echo ${NEXT}.${REV}
    ;;
  "ci")
    echo ${NEXT}-${2:-CI}${REV}
    ;;
  *)
    echo Version Information
    echo "Last:        ${TAG}"
    echo "Next:        ${NEXT}"
    echo "Revision:    ${REV}"
    echo "Version:     ${NEXT}.${REV}"
    echo "Type:        ${TYPE}"
    echo "Breaking:    ${BREAKING_COUNT} change(s)"
    echo "Features:    ${FEATURE_COUNT} change(s)"
    ;;
esac