Improve exists() check

.github/workflows/jsr.yml

@@ -25,4 +25,3 @@ jobs:
       - name: Publish
         run: |
           deno run -A jsr:@david/publish-on-tag@0.1.3
-

denops/dpp/ext.ts

@@ -118,17 +118,17 @@ export async function getExt(
   ]
 > {
   if (!loader.getExt(name)) {
-    await loader.autoload(denops, "ext", name);
-  }
-
-  const ext = loader.getExt(name);
-  if (!ext) {
-    if (name.length !== 0) {
+    const exists = await loader.autoload(denops, "ext", name);
+    if (!exists) {
       await printError(
         denops,
         `Not found ext: "${name}"`,
       );
     }
+  }
+
+  const ext = loader.getExt(name);
+  if (!ext) {
     return [
       undefined,
       defaultExtOptions(),
@@ -155,17 +155,17 @@ async function getProtocol(
   ]
 > {
   if (!loader.getProtocol(name)) {
-    await loader.autoload(denops, "protocol", name);
-  }
-
-  const protocol = loader.getProtocol(name);
-  if (!protocol) {
-    if (name.length !== 0) {
+    const exists = await loader.autoload(denops, "protocol", name);
+    if (!exists) {
       await printError(
         denops,
         `Not found protocol: "${name}"`,
       );
     }
+  }
+
+  const protocol = loader.getProtocol(name);
+  if (!protocol) {
     return [
       undefined,
       defaultProtocolOptions(),

denops/dpp/loader.ts

@@ -33,7 +33,7 @@ export class Loader {
     denops: Denops,
     type: DppExtType,
     name: string,
-  ) {
+  ): Promise<boolean> {
     const runtimepath = await op.runtimepath.getGlobal(denops);
     if (runtimepath !== this.#prevRuntimepath) {
       this.#cachedPaths = await globpath(
@@ -46,10 +46,14 @@ export class Loader {
     const key = `@dpp-${type}s/${name}`;
 
     if (!this.#cachedPaths[key]) {
-      return;
+      return this.#prevRuntimepath === "";
     }
 
     await this.registerPath(type, this.#cachedPaths[key]);
+
+    // NOTE: this.#prevRuntimepath may be true if initialized.
+    // NOTE: If not found, it returns false, .
+    return this.#prevRuntimepath === "" || this.#cachedPaths[key] !== undefined;
   }
 
   async registerPath(type: DppExtType, path: string) {