cli takes directories as well as files

cli/main.ts

@@ -19,14 +19,27 @@ const args = parse(Deno.args, {
   },
 });
 
-if (args["_"].length < 2) {
+const files: string[] = [];
+
+args["_"].forEach((arg) => {
+  arg = arg.toString();
+  if (Deno.statSync(arg).isDirectory) {
+    Array.from(Deno.readDirSync(arg)).forEach((entry) =>
+      files.push(`${arg}/${entry.name}`)
+    );
+  } else {
+    files.push(arg);
+  }
+});
+
+if (files.length < 2) {
   console.error("kollagen needs at least 2 images to work.");
   Deno.exit(1);
 }
 
 const images: ProxyImage[] = (await Promise.all(
-  args["_"].map(async (imageURL) =>
-    canvasKit.MakeImageFromEncoded(await Deno.readFile(imageURL.toString()))
+  files.map(async (imageURL) =>
+    canvasKit.MakeImageFromEncoded(await Deno.readFile(imageURL))
   ),
 )).map((image) => new ProxyImage(image!));
 
@@ -38,7 +51,7 @@ const mode = modes.modes[modeKey];
 console.log(
   `Creating a "${mode.name}" collage from ${images.length} images...`,
 );
-console.debug(`Images: ${args["_"].join(", ")}`);
+console.debug(`Images: ${files.join(", ")}`);
 
 const canvas = createCanvas(args["width"] || 640, args["height"] || 640);
 const context = canvas.getContext("2d");