mkpatch

#!/bin/bash

version=0.10
program=${0##*/}
progdir=${0%/*}
if [ "$progdir" = "$program" ]; then progdir="."; fi

# ----------------------------------------------------------------------
function usage() {
    cat <<EOF
NAME
	$program - given a patch name and a list of files, create a patch diff

SYNOPSIS
	$program [OPTIONS] ARGS

DESCRIPTION
	Given a patch name and a list of changed file, run svn diff to create
	a patch suitable for the patch command, named with the current date
	and the given patch name.  Place this in the local patch directory.
	

EOF
    echo -e "OPTIONS"
    if   [ "$(uname)" = "Linux" ]; then
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | tr -s "\t|" "\t," | sed -r -e 's/\)[ \t]+([A-Z]+)=\$2[^#]*#/=\1\t/' -e 's/\)[^#]*#/\t/'
    else
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | sed 's/\|.*\$2[^#]*#/	/'| sed -E 's/\|.*\)[^#]*#/	/'
    fi
    cat <<EOF

FILES

AUTHOR
	Written by Henrik Levkowetz, <henrik@tools.ietf.org>

COPYRIGHT
	Copyright 2013 Henrik Levkowetz.

	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. There is NO WARRANTY; not even the
	implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	PURPOSE. See the GNU General Public License for more details.
	
EOF

}

# ----------------------------------------------------------------------
function die() {
    echo -e "\n$program: error: $*" > /dev/stderr
    exit 1
}

function note() { 
	if [ -n "$VERBOSE" ]; then echo -e "$*"; fi
}

# ----------------------------------------------------------------------
function version() {
	echo -e "$program $version"
}

# ----------------------------------------------------------------------
trap 'echo "$program($LINENO): Command failed with error code $? ([$$] $0 $*)"; exit 1' ERR


# ----------------------------------------------------------------------
# Option parsing

# Options
shortopts=c:r:hvV
longopts=change=,revision=,help,verbose,version

# Default values

if   [ "$(uname)" = "Linux" ]; then
    args=$(getopt -o "$shortopts" --long "$longopts" -n "$program" -- $SV "$@")
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    eval set -- "$args"
    sed="sed -r"
else
    # Darwin, BSDs
    args=$(getopt -o$shortopts $SV $*)
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    set -- $args
    sed="sed -E"
fi

while true ; do
    case "$1" in
	-c| --change)	CHG="$2"; shift;;	# the change made by revision ARG
	-r| --revision)	REV="$2"; shift;;	# the change made between revisions REV
	-h| --help)	usage; exit;;		# Show this help, then exit
	-v| --verbose)	VERBOSE=1;;	# Be more talkative
	-V| --version)	version; exit;;		# Show program version, then exit
	--)		shift; break;;
	*) die "Internal error, inconsistent option specification: '$1'";;
    esac
    shift
done

# ----------------------------------------------------------------------
# The program itself

if [ $# -lt 2 ]; then die "Expected patch name and file list on the command line."; fi
if [[ $1 =~ / ]]; then die "Expected a patch name, but the first argument to $program seems to be a file path: '$1'"; fi

name=$1; shift;

patchfile=$progdir/../../patches/$(date +%Y-%m-%d)-$name.patch
svn diff ${CHG:+ -c $CHG} ${REV:+ -r $REV} "$@" > $patchfile
less $patchfile
echo ""
echo ""
echo "Patch is in $patchfile."