#! /bin/sh -e

case $# in  0 | 1) echo >&2 "usage: $0 NEWVER FILE ..."; exit 2 ;; esac
newver=$1; shift

for i; do
  t=$(git log -n1 --date="format:%Y/%m/%d" --format="%H %cd" "$i")
  read h d <<EOF
$t
EOF
  set +e
  if ! v=$(git describe 2>/dev/null --contains $h); then v=$newver
  else v=${v%[~^]*}
  fi
  set -e
  perl -i -pe"s!^((?:\\%\<\\+[^>]*\\>)?\\s*\\[)[\\d/]+ [\\d.]+( .*$)!\${1}$d $v\${2}!" "$i"
done