Improve langbook script running time and change to non-interactive mode

utils/langbooks.sh

@@ -4,35 +4,19 @@
 #Date: 14/11/2010
 #Description: Generate an sb file containing all the songs in a given language
 
-echo "Build songbook file for songs in english (1), french (2)"
-read answer
-case "$answer" in
-    1)
-        cat ./utils/header-en > english.sb
-	for song in songs/*/*.sg; 
-	do
-	    if grep -q "selectlanguage{english}" $song
-	    then
-		echo "\t\""`ls $song | sed "s/songs\\///g"`"\"," >> english.sb
-	    fi
-	done
-        #remove last coma before bracket
-	truncate --size=-2 english.sb
-	#close json values for key "songs"
-	echo "]\n}" >> english.sb
-      ;;
-    2)
-	cat ./utils/header-fr > french.sb
-	for song in songs/*/*.sg; 
-	do
-	    if grep -q "selectlanguage{french}" $song
-	    then
-		echo "\t\""`ls $song | sed "s/songs\\///g"`"\"," >> french.sb
-	    fi
-	done
-	#remove last coma before bracket
-	truncate --size=-2 french.sb
-	#close json values for key "songs"
-	echo "]\n}" >> french.sb
-	;;
-esac
+if [ $# -ne 1 ];
+then
+    echo "Usage: $0 LANG"
+    exit 1
+fi;
+
+LANG=$1
+
+if [ $LANG="english" -o $LANG="french" ];
+then
+    cp "./utils/header-$LANG" "$LANG.sb"
+    grep "selectlanguage{$LANG}" songs/*/*.sg | sed 's|songs/\(.*\):.*|    \"\1\",|; $ s|,$|\n  ]\n}\n|' >> "$LANG.sb"
+else
+    echo "Error: $LANG is not a supported language"
+    exit 2
+fi;