#!/bin/bash

# This script will generate a patch with the appropriate LFS header
# 
# Asumptions
#
# *  The script assumes that you have two directories
#    One for the unmodified and one modified
#    Examples: zoo-2.10 and zoo-2.10.orig
#	   The .orig is unmodified
#
#    or
#    The script assums that you have two files
#    One for the umodified and one modified
#    Examples: config.h and config.h.orig 
#	   The .orig is unmodified
#
# *  It assumes that this is a first release patch and
#    adds -1 to end of the patch. Unless you specify the
#    third option
# 
# Script depends on the following programs that are not standard with
# LFS (See BLFS for installation)
# * nail
# * which
#
# This script also create a blank header that will need to be edited
# with the Initial Package Version:, Origin: , and Description: of
# the patch
#
# See ChangeLog at the end for credits.
#

# Input Check
# 
dir="$1"
type="$2"
version="$3"
submit="$4"

if [ "$dir" == "" ] || [ "$type" == "" ]
	then	
		echo "The command below will create a patch."
		echo "$0 directory description [version [submit]]"
		exit
fi

if [ "$version" == "" ]
	then
		version="1"
fi

rm -f /tmp/patch.mail /tmp/file.list /tmp/file.list.new

#check whether dirs to diff exist
if ! test -d $dir -a -d $dir.orig; then
    echo "directory $dir or $dir.orig is missing."
    echo "aborting."
    exit
fi


# Variables
#
submitter="Uwe Düffert"
email="lfs@uwe-dueffert.de"
homeurl="http://www.uwe-dueffert.de/lfs/ownpatches"
date="`date +%F`"
patches="patches@linuxfromscratch.org"

# If you want the script to submit your patches
# You will need to specify the mailer program
#
# Currently the script only works with nail and mail
#
SUBMIT_PATCH="enabled"
if [ "$submit" == "" ]
	then
		SUBMIT_PATCH="disabled"
fi

# Enter name of Mail Program
mailprog="mail"

# Enter name of Editor
editorprog="vim"

# If you want the script to be compressed
#
COMPRESS="enabled"

# Enter name of compressing program
compressprog="bzip2"
compressext="bz2"

# Do not edit this
editorbin="`which $editorprog`"
compressbin="`which $compressprog`"

# Subroutines
#
YESNO ()
{
	INPUT="$1"
	echo -n "$INPUT -=>"
	RETURN="0"
	read input
	if [ "$input" == "YES" ] || [ "$input" == "yes" ] || [ "$input" == "Y" ] || [ "$input" == "y" ]
		then
			OK="YES"
			RETURN="1"
	fi
	if [ "$input" == "NO" ] || [ "$input" == "no" ] || [ "$input" == "N" ] || [ "$input" == "n" ]
		then
			OK="NO"
			RETURN="1"
	fi
	if [ "$RETURN" == "0" ]
		then
			YESNO "$INPUT"
	fi
}

# Parse Email
#
emailobfuscated="`echo $email|sed -e s%'@'%' at '% -e s%'\.'%' dot '%g`"

# Create Patch Header
#
echo "Submitted By: $submitter ($emailobfuscated)" > $dir-$type-$version.patch
echo "Date: $date" >> $dir-$type-$version.patch
echo "Initial Package Version: " >> $dir-$type-$version.patch
echo "Origin: self-created, $homeurl/$dir-$type-$version.patch" >> $dir-$type-$version.patch
echo "Upstream Status: not reported" >> $dir-$type-$version.patch
echo "Description: " >> $dir-$type-$version.patch
echo " " >> $dir-$type-$version.patch

# Lets edit the patch Header
#
$editorbin $dir-$type-$version.patch

# Copy the patch header for email text
#
cp $dir-$type-$version.patch /tmp/patch.mail

# Create Patch from directory.orig directory
#
echo "Creating patch from directory $dir.."
LC_ALL=C TZ=UTC0 diff -Naur $dir.orig $dir >> $dir-$type-$version.patch


rm -f /tmp/file.list /tmp/file.list.new

if [ "$SUBMIT_PATCH" == "enabled" ]
	then
		mailbin="`which $mailprog`"
		if [ "$mailbin" != "" ] && [ "$email" != "" ]
			then
				YESNO "Are you sure you want to send $dir-$type-$version to $patches (yes/no)"
				if [ "$OK" == "YES" ]
					then
						if [ "$COMPRESS" == "enabled" ]
							then
								echo "Compressing $dir-$type-$version.patch..."
								$compressbin $dir-$type-$version.patch
								attachment="$dir-$type-$version.patch.$compressext"
							else
								attachment="$dir-$type-$version.patch"
						fi
						echo "Sending email to $patches..."
						$mailbin -B -s "Patch Submission for $dir" -a $attachment -r $email $patches < /tmp/patch.mail
				fi
		fi
fi
rm -f /tmp/patch.mail $dir-$type-$version.patch.$compressext /tmp/file.list /tmp/file.list.new

 # ChangeLog:
 # [2003-10-06]
 #  * Initial Version (Jim Gifford)
 # [2003-10-16]
 #  * Fixed typo in submission e-mail address (Ronald Hummelink)
 #  * Fixed e-mail obfuscation to handle more than one "." (Ronald Hummelink)
 # [2004-05-04]
 #  * Added Upstream Status Header (Jim Gifford)