bash2version

#!/bin/bash
# Sets the string to use a replace target
VER='VERSION'

# String used to signal a prerelease
PRERELEASE_STRING='rc'

# Version Prefix to add
# PREFIX='v'
PREFIX=''

# Provide a list of files to modify and the regex to use for them
# in the form of FILE;REGEX
# use $VER
FILES=(
  # 'package.json;"version": "VERSION"' # Simple usage
  # "package.json;\"version\": \"$PREFIX$VER\"" # add the version replace string and version prefix from variables
  'package.json;"version": "VERSION"'
  'deploy.sh;TAG=VERSION'
)

# Regex used to parse semver
# \1 = MAJOR
# \2 = MINOR
# \3 = PATCH
# \5 = PRERE
# \8 = BUILD
SEMVER='(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\-?((0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)\.?(([0-9]\.*)*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?'

help() {
  echo "bash2version - bash your version number into place

bash2version --set VERSION | --bump major|minor|patch|prerelease|release [--pre | --rc | --devel] [--build BUILD] [-c | --commit] [-p | --push] [FILES]

OPTIONS:
  -b, --bump major|minor|patch|prerelease|release:
      bumps the specified version segment, prerelease either adds 
      the prerelease segment ('-rc' by default) or increments it's
      number ('-rc.1'). release removes the prerelease segment

  --pre, --rc, --devel:
      Add the prerelease segment while bumping the 
      major, minor, or patch segment with '-b'

  --build BUILD:
      add build metadata specified by BUILD

  --prefix PREFIX:
      set the prefix for the version

  -s, --set VERSION:
      set the version to the string provided by VERSION

  -c, --commit:
      git commit and git tag the version

  -p, --push:
      push the tag

  FILES:
      the files and regex to run on in the format file;regex VERSION
      Use VERSION as a placeholder for where the version would be"
}

# Check if an argument was provided to the given option;
check_arg_exist() {
    if [[ -z $2 || $2 == "-"* ]]; then
        echo "ERROR: argument $1 requires an argument!"
        exit 1
    fi
}


POSITIONAL=()
while [[ $# -gt 0 ]]; do
  key="$1"
  case $key in
    -b | --bump)
      check_arg_exist "$1" "$2"
      BUMP=$2
      shift
      shift
    ;;
    --build)
      check_arg_exist "$1" "$2"
      BUILD=$2
      shift
      shift
    ;;
    --prefix)
      check_arg_exist "$1" "$2"
      PREFIX=$2
      shift
      shift
    ;;
    --pre | --rc | --devel)
      SETPRERE=1
      shift
    ;;
    -s | --set)
      check_arg_exist "$1" "$2"
      SETVERSION=$2
      shift
      shift
    ;;
    -c | --commit)
      GITCOMMIT=1
      shift
    ;;
    -p | --push)
      GITPUSH=1
      shift
    ;;
    --help)
      help
      exit
      shift
    ;;
    *)
      POSITIONAL+=("$1")
      shift
    ;;
  esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters

get_version() {
  if [ -z "${FILES[0]}" ]; then
    echo "No Files provided. Exiting..."
    exit
  fi
  MATCH=${FILES[0]#*;}
  if [ -f "${FILES[0]%;*}" ]; then
    TMPVERSION=$(sed -nr "s/.*${MATCH/$VER/$SEMVER}.*/\1;\2;\3;\5;\6;\8/gp" "${FILES[0]%;*}")
    IFS=';' read -r MAJOR MINOR PATCH PRERE PRERENUM BUILDT <<< "$TMPVERSION"; IFS=''
  else
    echo "File \"${FILES[0]%;*}\" does not exists"
    exit 1
  fi
}

set_version() {
  if [ -n "$SETVERSION" ]; then
    VERSION=$SETVERSION$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)
  elif [ -n "$BUMP" ]; then
    if [ "${BUMP,,}" == "major" ]; then
      VERSION=$((MAJOR + 1)).0.0$(if [ -n "$SETPRERE" ]; then echo "-$PRERELEASE_STRING"; fi)$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)
    elif [ "${BUMP,,}" == "minor" ]; then
      VERSION=$MAJOR.$((MINOR + 1)).0$(if [ -n "$SETPRERE" ]; then echo "-$PRERELEASE_STRING"; fi)$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)
    elif [ "${BUMP,,}" == "patch" ]; then
      VERSION=$MAJOR.$MINOR.$((PATCH + 1))$(if [ -n "$SETPRERE" ]; then echo "-$PRERELEASE_STRING"; fi)$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)
    elif [ "${BUMP,,}" == "prerelease" ]; then
      VERSION=$MAJOR.$MINOR.$PATCH$(if [ -z "$PRERE" ]; then echo "-$PRERELEASE_STRING"; else echo "-${PRERELEASE_STRING}$(if [ -z "$PRERENUM" ]; then echo ".1"; else echo ".$((PRERENUM + 1))"; fi)$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)"; fi)
    elif [ "${BUMP,,}" == "release" ]; then
      VERSION=$MAJOR.$MINOR.$PATCH$(if [ -n "$BUILD" ]; then echo "+$BUILD"; fi)
    else
      echo "No valid Version segment provided"
      exit 1
    fi
  fi
}

apply_version() {
  IFS=';'

  echo "Applying Version: $PREFIX$VERSION"

  for i in "${FILES[@]}"; do
    set -- $i
    if [ -f "$1" ]; then
      sed -ri "s/${2/$VER/$SEMVER}/${2/$VER/$VERSION}/g" $1
    else
      echo "File \"$1\" does not exists"
      exit 1
    fi
  done

  IFS=''
}

if [[ -z $SETVERSION && -z $BUMP ]]; then
  help
  exit
else
  if [ -n "$*" ]; then
    FILES="$*"
  fi
  get_version
  set_version
  apply_version
  if [[ $GITCOMMIT -eq 1 ]]; then
    git commit -am "Bump version to $PREFIX$VERSION"
    git tag -a "$PREFIX$VERSION" -m "Release version $PREFIX$VERSION"
  fi
  if [[ $GITPUSH -eq 1 ]]; then
    git push --follow-tags
  fi
fi