bump package.json version number (patch only)

bump.sh

#!/bin/sh

function bump {

  # full package version
  PACKAGE_VERSION=$(cat package.json \
      | grep version \
      | head -1 \
      | awk -F: '{ print $2 }' \
      | sed 's/[",]//g' \
      | tr -d '[[:space:]]')

  # current patch version
  PATCH=${PACKAGE_VERSION##*.}

  # Length of the new patch number
  LENGTH=${#PATCH}

  # Append 1 to patch version
  NEWPATCHVERSION=`expr $PATCH + 1`

  # major and minor string only (without patch)
  MAJORMINOR="${PACKAGE_VERSION::-$LENGTH}"

  # Merge all togeather
  FULL="$MAJORMINOR$NEWPATCHVERSION"

  # replace in file and pipe to temp
  sed 's|\(.*"version"\): "\(.*\)",.*|\1: '"\"$FULL\",|" package.json > package.tmp

  # remove old package.json
  rm package.json
  
  # replace package.json
  mv package.tmp package.json

}

bump