add fetchSave

Author: taisukef

fetchSave.js

@@ -0,0 +1,22 @@
+import { fetchBinAsBrowser } from "https://js.sabae.cc/fetchBinAsBrowser.js";
+import { SJIS } from "https://js.sabae.cc/SJIS.js";
+
+export const fetchSave = async (url, path, sjischange) => {
+  if (url.endsWith(".csv")) sjischange = true;
+  
+  const fn = url.substring(url.lastIndexOf("/") + 1);
+  if (!path.endsWith("/")) path += "/";
+  try {
+    await Deno.readFile(path + fn);
+    return false;
+  } catch (e) {
+  }
+  const bin = await fetchBinAsBrowser(url);
+  if (sjischange) {
+    const utf8 = SJIS.decodeAuto(bin);
+    await Deno.writeTextFile(path + fn, utf8);
+  } else {
+    await Deno.writeFile(path + fn, bin);
+  }
+  return true;
+};