Use gs to check page count before sending

fax.sh

@@ -63,6 +63,16 @@ then
 	echo "File too big. Cannot be more than 10MB."
 	exit 2
 fi
+if hash gs 2>/dev/null
+then
+	if [ $(gs -q -dNODISPLAY -c "(fax.pdf) (r) file runpdfbegin pdfpagecount = quit" 2>&1) -gt 30 ]
+	then
+		echo "Sipgate won't send your file, because it has more than 30 pages"
+		exit 2
+	fi
+else
+	echo "ghostscript not installed, cannot check for page numbers. Sipgate accepts up to 30 pages."
+fi
 #Needs to be base64 encoded:
 CONTENT=$(base64 "$FILE" -w 0)
 if [ -z "$CONTENT" ];