#!/bin/bash

# Add a Content-Disposition header line to patch files according to
# their file name.
#
# Copyright (C) 2006  Jean Delvare
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details:
# http://www.gnu.org/copyleft/gpl.html
#
# The latest official version of this script can be found at:
# ftp://ftp.kernel.org/pub/linux/kernel/people/jdelvare/scripts/add-content

if [ $# -eq 0 ]
then
	echo "Usage: add-content file [file...]" >&2
	exit 1
fi

for file in $@
do
	if [ ! -f $file ]
	then
		echo "$file doesn't exist or isn't a regular file"
		exit 1
	fi

	filename="$(basename "$file")"
	awk '
	NR==1 && /^From:/ { print ; next }
	/^[Cc]ontent-[Dd]isposition/ { next }
	!done { print "Content-Disposition: inline; filename='"$filename"'";
		if (NF) { print "" };
		done=1; print; next }
	{ print }
	' < "$file" > "$file.add-content"

	if ! diff -q "$file.add-content" "$file" > /dev/null
	then
		mv -f "$file.add-content" "$file"
	else
		echo "$file: Already OK, no change"
		rm -f "$file.add-content"
	fi
done