#! /bin/sh --
#
# http://cryp.to/redate
#
# Match anything that resembles an ISO date and change it
# to today. Report which files have have been changed.
#
# Latest release: 2009-04-22  (SCNR)
#

if [ $# -lt 1 ]; then
    echo "Usage: $0 file [file...]"
    exit
fi

today=`date --iso-8601`

append_dots_to_row()
  {
  local pad n
  n=${2}
  while [ ${n} -gt 0 ]; do
    pad="${pad}."
    n=`expr ${n} - 1`
  done

  echo "${1}${pad}" | \
    awk '{ printf("%s ", substr($0, 0, n)); }' n=${2}
  }

for n in $*; do
  append_dots_to_row ${n} 50

  sed -e "s/200[789]-[0-9][0-9]-[0-9][0-9]/${today}/g" <${n} >${n}.tmp

  if cmp --quiet ${n} ${n}.tmp; then
    rm ${n}.tmp
    echo "nothing"
  else
    mv ${n}.tmp ${n}
    echo "redated"
  fi

done