#!/bin/bash
  
  # makes sure the line See ../../COPYING for clarification regarding multiple
  # authors appears in the apache headers in the source, and that source files
  # have their Apache headers.  Including this mainly for documentation, as I
  # doubt the issue will occur much in future.
  #
  # Also makes sure that where the filename appears in a comment at the top of the
  # file, e.g. as in
  # // somedir/some-file.cc
  # the filename is accurate.
  
  # run this from the top level of the repo, as
  # misc/maintenance/fix_apache_headers.sh
  
  set -e
  cd src
  rm -rf tmp
  for x in */*.{h,cc,dox}; do
    if [ $x != "util/basic-filebuf.h" ]; then
      if ! grep 'COPYING for clarification' $x >/dev/null; then
        echo Fixing $x;
        if ! grep "Apache License" $x >/dev/null; then
          echo "$0: warning: file $x may not have an Apache license header"
        else
          cp $x tmp; cat tmp | perl -ape ' if (m/Licensed under the Apache License/) {
          print "// See ../../COPYING for clarification regarding multiple authors
  ";
          print "//
  ";} ' > $x;
        fi
      fi
    fi
  done
  
  for x in */*.{h,cc,dox}; do
    if [ $x != "util/basic-filebuf.h" ]; then
      echo "// $x" | cat - <(tail -n +2 $x)  >tmp
      if ! diff tmp $x; then
        if head -n 1 $x | grep -E '// [-a-z0-9_]+/[-a-z0-9_.]+$'; then
          echo "Fixing $x automatically"
          cp tmp $x
        else
          echo "**Please fix $x manually"
        fi
      fi
    fi
  done