X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~cjwatson/git?p=bin.git;a=blobdiff_plain;f=rosetta-merge;h=a1b50193696adf8f7371b436a0d670c06b41a75c;hp=b34676cfc1dae68882259d28d295bcfd26f56285;hb=b238980e7533a97a6e14c1fdbc7f4da91e924001;hpb=f007a881f209c2519ed1b6dd068eced6b958c229

diff --git a/rosetta-merge b/rosetta-merge
index b34676c..a1b5019 100755
--- a/rosetta-merge
+++ b/rosetta-merge
@@ -1,22 +1,44 @@
 #! /bin/bash
 
-APPLY=false
-if [ "$1" = --apply ]; then
-	APPLY=:
-	shift
-fi
+usage () {
+	[ "$1" = 0 ] || exec >&2
+	echo "Usage: $0 [--apply] [--keep-old] [--prefix PREFIX] SOURCE LANG"
+	exit "$1"
+}
 
-KEEP_OLD=false
-if [ "$1" = --keep-old ]; then
-	KEEP_OLD=:
-	shift
-fi
+die_getopt () {
+	echo "getopt failed" >&2
+	exit 1
+}
 
+APPLY=false
+KEEP_OLD=false
 PREFIX=
-if [ "$1" = --prefix ]; then
-	PREFIX="$2-"
-	shift 2
-fi
+eval set -- "$(getopt -o '' -l apply,keep-old,prefix:,help -- "$@")" || die_getopt
+while :; do
+	case $1 in
+		--apply)
+			APPLY=:
+			shift
+			;;
+		--keep-old)
+			KEEP_OLD=:
+			shift
+			;;
+		--prefix)
+			PREFIX="${2%-}-"
+			shift 2
+			;;
+		--help)
+			usage 0
+			shift
+			;;
+		--)	shift; break ;;
+		*)	die_getopt ;;
+	esac
+done
+
+[ "$1" ] || usage 1
 
 SOURCE="$1"
 shift