feat(extract): added the ability to extract metadata directly

src/tools/extract.ts

@@ -0,0 +1,29 @@
+import * as _ from "lodash";
+import * as yargs from "yargs";
+import * as scanner from "../scanner";
+
+export var command = "extract";
+export var describe = "Extracts a YAML from a list of files";
+
+export function builder(yargs: yargs.Arguments)
+{
+    return yargs
+        .help("help")
+
+        .alias("o", "output")
+        .default("output", "-")
+
+        .demand(1);
+}
+
+export function handler(argv: any)
+{
+    var files = argv._.splice(1);
+    var data = scanner.scanFiles(argv, files);
+    render(argv, data);
+}
+
+export function render(argv, data)
+{
+    console.log(JSON.stringify(data));
+}