add snarf.ts

snarf.ts

@@ -0,0 +1,14 @@
+import { readerFromStreamReader } from "https://deno.land/std/io/mod.ts";
+import { basename, dirname } from "https://deno.land/std/path/mod.ts";
+
+export async function snarf(url: Request | string, init?: RequestInit, fn?: string): Promise<void> {
+  var outf= fn ?? basename(typeof url === "string" ? url : url.url)
+  res= await fetch(url, init);
+  sr= res.body?.getReader();
+  if(sr !== null && sr !== void 0) {
+    var r=readerFromStreamReader(sr);
+    var f=Deno.open(outf, {create:true,write:true})
+    await Deno.copy(r,f)
+    f.close()
+  }
+}