Enhance version_info to support SemVer

bin/ffoom.in

@@ -15,9 +15,17 @@ usage() {
 }
 
 version_info() {
-    echo "$(basename $0) (Fast Foo bash library) $FFOO_VERSION"
-    echo
-    echo "install path: __FFOO_DIR__"
+    case $1 in
+        semver) echo "$FFOO_VERSION" ;;
+        major)  echo $(cut -d. -f1 <<<"$FFOO_VERSION");;
+        minor)  echo $(cut -d. -f2 <<<"$FFOO_VERSION");;
+        patch)  echo $(cut -d. -f3 <<<"$FFOO_VERSION");;
+        *)
+            echo "$(basename $0) (Fast Foo bash library) $FFOO_VERSION"
+            echo
+            echo "install path: __FFOO_DIR__"
+            ;;
+    esac
 }
 
 lsfun() {