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

1 files changed, 25 insertions, 11 deletions

diff --git a/src/med-xpi-pack b/src/med-xpi-pack
index 0c7236d..a44698c 100755
--- a/src/med-xpi-pack
+++ b/src/med-xpi-pack
@@ -26,23 +26,37 @@
 INDIR=$1;
 XPIFILE=$2;
 
+function usage() {
+	echo -e "med-xpi-pack - Script to produce XPI file from input directory.\n";
+	echo "The output XPI file is placed in top-level of the input directory.";
+	echo "To place it somewhere else, provide relative or absolute path to the";
+	echo -e "output XPI file.\n"
+	echo "To run it call:";
+	echo -e "$ med-xpi-pack input_directory output_xpi_file\n";
+	echo " input_directory - directory with the XPI source tree";
+	echo " output_xpi_file - name of the produced file";
+	exit 1;
+}
+
+if [ $1 = "--help" -o $1 = "-h" ] ; then
+        usage;
+fi;
+
 if [ -z $INDIR ] ; then
-        echo "Missing input directory.";
-        echo "Usage: med-xpi-pack indir xpiname";
-	exit;
+	echo -e "Missing input directory.\n";
+	usage;
 fi;
 if [ -z $XPIFILE ] ; then
-        echo "Missing XPI name.";
-        echo "Usage: med-xpi-pack indir xpiname";
-	exit;
+	echo -e "Missing XPI name.\n";
+	usage;
 fi;
-if [ -e $XPIFILE ] ; then
-	echo "E: XPI file already exists.";
-	exit;
+if [ -f $XPIFILE ] ; then
+	echo -e "E: XPI file already exists.\n";
+	usage;
 fi;
 if [ ! -d $INDIR ] ; then
-	echo "E: Input directory doesn't exist.";
-	exit;
+	echo -e "E: Input directory doesn't exist.\n";
+	usage;
 fi;
 
 pushd $INDIR > /dev/null;