Program to add git tags based on changes to npm package.json version

git-tag-npm-version.sh

#!/bin/bash

pattern=:V:
test=0
confirm=0

function print_help() {
  echo ""
  echo "Usage: git-tag-npm-version <arguments>"
  echo ""
  echo "-p <pattern>"
  echo "  :V: will be replaced by the version in the package.json"
  echo ""
  echo "example:"
  echo ""
  echo "$ git-tag-npm-version -p v:V:"
  echo "> v1.0.0"
  echo "> v1.0.1"
  echo ""
  echo "-y"
  echo "  Automatically confirms all branch names"
  echo ""
  echo "-t"
  echo "  Test mode; prints all tags without tagging"
  echo ""
  exit 0
}


while getopts ":p:hty" opt; do
  case $opt in
    p)
      pattern=$OPTARG
      if [[ !( $pattern =~ \:V\: ) ]]; then
        echo "Pattern must contain :V:" >&2
        exit
      fi
      ;;
    t)
      test=1
      ;;
    y)
      confirm=1
      ;;
    h)
      print_help
      ;;
    \?)
      echo "bad argument" >&2
      exit
      ;;
  esac
done


{ git log -L3,3:package.json | grep -E '^commit|^\+ ' | sed -e ':a' -e 'N' -e '$!ba' -e 's/\n+/ /g' | tr -d '",' | tr -s ' ' | cut -f2,4 -d' ' | awk '$2!=""' | while read line; do
  commit=$(echo $line | cut -f1 -d' ')
  version=$(echo $line | cut -f2 -d' ')
  version=$(echo "$pattern" | sed "s/:V:/$version/g")
  if (( $test == 0 )); then
    if (( $confirm == 0 )); then
      read -u 3 -r -p "Are you sure you want to add tag $version? [c/y/N] " response
      case "$response" in
        [yY][eE][sS]|[yY])
          git tag $version $commit
          ;;
        [cC])
          exit
          ;;
        *)
          echo "version $version not tagged"
          ;;
      esac
    elif (( $confirm == 1 )); then
      git tag $version $commit
    fi
  elif (( $test == 1 )); then
    echo "$version"
  fi
done } 3<&0
echo ""