cp-pkgver

#!/bin/bash

# initialize gettext
export TEXTDOMAIN='bash'

# parse arguments
assign_if_exists() {
  if [ -f "$2" ]
  then
    eval "$1='$2'"
  else
    printf "$0: $(gettext "%s: file not found")\n" "$2"
    exit 1
  fi
}

while [ $OPTIND -le $# ]
do
  if getopts 'h' argument
  then
    case $argument in
      h)
        echo "usage: $0 [-h] <source> <destination>"
        echo 'Copies the value of the pkgver and pkgrel variables from one PKGBUILD to another.'
        echo ' -h  only shows this help text'
        exit ;;
      \?) exit 1 ;;
    esac
  else
    if [ -z ${src++} ]
    then
      assign_if_exists src "${!OPTIND}"
    elif [ -z ${dst++} ]
    then
      assign_if_exists dst "${!OPTIND}"
    else
      echo "$0: $(gettext "too many arguments")"
      exit 1
    fi
    let OPTIND++
  fi
done

# gather numbers
srcver=$(grep -Po '(?<=^pkgver=)[^ ]*' "$1")
srcrel=$(grep -Po '(?<=^pkgrel=)[^ ]*' "$1")
dstver=$(grep -Po '(?<=^pkgver=)[^ ]*' "$2")
dstrel=$(grep -Po '(?<=^pkgrel=)[^ ]*' "$2")

# copy if necessary
if [ $srcver != $dstver -o $srcrel != $dstrel ]
then
  if [ -w "$2" ]
  then
    sed --follow-symlinks -i "s:^pkgver=[^ ]*:pkgver=$srcver:;s:^pkgrel=[^ ]*:pkgrel=$srcrel:" "$2"
  else
    printf "$0: $(gettext -d 'pacman-scripts' \
      "%s is not writeable -- pkgver will not be updated")\n" "$2"
    exit 2
  fi
fi