Script to update Snowplow copyright notices

fix_copyright.sh

#!/bin/sh

# This script updates copyright notices for all files in the current branch which have changed since master.

set -e

if [ -f tmp ];
then
  >&2 echo "Error - this script would overwrite the 'tmp' file"
  exit 1
fi	

year=`date +"%Y"`

# Only alter the copyright range for files altered in this branch
git diff --diff-filter=ACMRTUXB master @ --name-only | while read -r filepath; do
  cat $filepath |
  # Update copyright notices which already have a range of dates ("2012-2013" -> "2012-2015")
  sed "/$year/b; s/Copyright (c) \([0-9]*\)-[0-9]* Snowplow Analytics Ltd/Copyright (c) \1-$year Snowplow Analytics Ltd/" |
  # Update copyright notices which have a single date ("2012" -> "2012-2015")
  sed "/$year/b; s/Copyright (c) \([0-9]*\) Snowplow Analytics Ltd/Copyright (c) \1-$year Snowplow Analytics Ltd/" > tmp;
  mv tmp $filepath;
done

Warning: this script may alter file permissions!