cli zsh completions nit

cli/src/main.ts

@@ -1,5 +1,5 @@
 import { Command } from "@cliffy/command";
-import { CompletionsCommand } from "@cliffy/command/completions";
+import { generateShellCompletions } from "@cliffy/command/completions";
 import { UpgradeCommand } from "@cliffy/command/upgrade";
 import * as log from "./core/log.ts";
 
@@ -172,7 +172,20 @@ const command = new Command()
       );
     })
   )
-  .command("completions", new CompletionsCommand());
+  .command(
+    "completions",
+    new Command()
+      .description("Generate shell completions.")
+      .command("bash", new Command().description("Generate bash completions.").action(() => {
+        process.stdout.write(generateShellCompletions(command, "bash") + "\n");
+      }))
+      .command("zsh", new Command().description("Generate zsh completions.").action(() => {
+        process.stdout.write(generateShellCompletions(command, "zsh") + "\n");
+      }))
+      .command("fish", new Command().description("Generate fish completions.").action(() => {
+        process.stdout.write(generateShellCompletions(command, "fish") + "\n");
+      }))
+  );
 
 async function main() {
   try {

cli/test_completions4.ts

@@ -0,0 +1,13 @@
+import { Command } from "@cliffy/command";
+import { ZshCompletionsGenerator } from "@cliffy/command/completions/_zsh_completions_generator";
+const { default: command } = await import("./src/main.ts");
+
+// Generate completions manually
+const output = ZshCompletionsGenerator.generate("wmill", command);
+console.error(`output length: ${output.length}`);
+
+// Write using process.stdout.write with callback
+process.stdout.write(output + "\n", () => {
+  console.error("write callback called");
+  process.stdin.destroy();
+});