#!/bin/sh

export MAKEFLAGS=""
top_srcdir="$(make -s echo-topdir)"

#
# Check that the copyright information is valid
#
nfails=0
nfiles=0
for dir in $(make -s echo-dirs -C "${top_srcdir}"); do
  if [ ! -d "${top_srcdir}/${dir}" ]; then continue; fi
  for x in $(make -s echo-sources -C "${top_srcdir}/${dir}"); do
    case "$x" in
      *.c|*.cpp|*.h|*.m|*.php|*.cs|*.java|.py|.pl)
        nfiles=$(($nfiles + 1)) ;;
      *)
        continue ;;
    esac
    if ! grep 'Copyright *\((c)\|(C)\|©\)' "${top_srcdir}/${dir}/$x" >/dev/null 2>&1; then
      echo "error: ${dir}/$x lacks proper copyright information"
      nfails=$(($nfails + 1))
    elif [ -d "${top_srcdir}/.git" ]; then
      Y="$(git log "${top_srcdir}/${dir}/$x" | head -n 3 | sed -ne 's/^Date.* \([0-9][0-9][0-9][0-9]\) .*/\1/p')"
      if [ "$Y" != "" ]; then
        if ! grep "$Y.*@" "${top_srcdir}/${dir}/$x" >/dev/null 2>&1; then
          echo "error: ${top_srcdir}/${dir}/$x last modified in $Y, which is not in copyright"
          git log "${top_srcdir}/${dir}/$x" | head -n 3 | sed 's/^/info: /'
          nfails=$(($nfails + 1))
        fi
      fi
    fi
  done
done

echo "$nfiles files, $nfails errors in copyright information"

if test "$nfails" != "0"; then
  exit 1
fi

exit 0