Add function usage() to src/med-xpi-unpack to print out information on error, or -h/--help

1 files changed, 23 insertions, 11 deletions

diff --git a/src/med-xpi-unpack b/src/med-xpi-unpack
index 53b8bb1..9c66c89 100755
--- a/src/med-xpi-unpack
+++ b/src/med-xpi-unpack
@@ -24,23 +24,35 @@
 XPIFILE=$1;
 OUTDIR=$2;
 
+function usage() {
+	echo -e "med-xpi-unpack - Script to unpack XPI file to output directory.\n";
+	echo "To run it call:";
+	echo -e "$ med-xpi-unpack input_xpi_file output_directory\n";
+	echo " input_xpi_file - packed XPI source tree";
+	echo " output_directory - location where the unpacke XPI file is placed";
+	exit 1;
+}
+
+if [ $1 = "--help" -o $1 = "-h" ] ; then
+	usage;
+fi;
+
 if [ -z $XPIFILE ] ; then
-	echo "Missing xpiname directory.";
-	echo "Usage: med-xpi-unpack xpiname outdir";
-	exit;
+	echo -e "Missing XPI file.\n";
+	usage;
 fi;
 if [ -z $OUTDIR ] ; then
-        echo "Missing output directory.";
-        echo "Usage: med-xpi-unpack xpiname outdir";
-        exit;
+        echo -e "Missing output directory.\n";
+        usage;
 fi;
 if [ -d $OUTDIR ] ; then
-	echo "E: Output directory already exists.";
-	exit;
+	echo -e "E: Output directory already exists.\n";
+	usage;
 fi;
-if [ ! -e $XPIFILE ] ; then
-	echo "E: XPI file doesn't exist.";
-	exit;
+
+if [ ! -f $XPIFILE ] ; then
+	echo -e "E: XPI file doesn't exist.\n";
+	usage;
 fi;
 
 mkdir $OUTDIR;