Piped input (#104)

* New method for handling stdin. Bypass Ink, and output to stdout. Makes the CLI work like a typical Unix application when called with piped input.

* Fixing a few post-merge errors.

* Format code.

* Clean up lint and format errors.

packages/cli/src/ui/hooks/useStdin.ts

@@ -1,84 +0,0 @@
-/**
- * @license
- * Copyright 2025 Google LLC
- * SPDX-License-Identifier: Apache-2.0
- */
-
-import { useState, useEffect } from 'react';
-import { useStdin } from 'ink';
-
-export interface PipedInputState {
-  data: string | null; // Use null initially to distinguish from empty string
-  isLoading: boolean;
-  error: string | null;
-  isPiped: boolean; // Flag to indicate if input was piped
-}
-
-export function usePipedInput(): PipedInputState {
-  const { stdin, setRawMode, isRawModeSupported } = useStdin();
-  // Keep exit available if needed, e.g., for error handling, but maybe let consumer handle it
-  // const { exit } = useApp();
-
-  const [pipedData, setPipedData] = useState<string | null>(null);
-  const [isLoading, setIsLoading] = useState<boolean>(true); // Assume loading until checked
-  const [error, setError] = useState<string | null>(null);
-  const [isPiped, setIsPiped] = useState<boolean>(false);
-
-  useEffect(() => {
-    // Determine if input is piped ONLY ONCE
-    const checkIsPiped = !stdin || !stdin.isTTY;
-    setIsPiped(checkIsPiped);
-
-    if (checkIsPiped) {
-      // Piped input detected
-      if (isRawModeSupported) {
-        setRawMode(false); // Ensure raw mode is off for stream reading
-      }
-
-      // Ensure stdin is available (it should be if !isTTY)
-      if (!stdin) {
-        setError('Stdin stream is unavailable.');
-        setIsLoading(false);
-        return; // Cannot proceed
-      }
-
-      let data = '';
-      const handleData = (chunk: Buffer) => {
-        data += chunk.toString();
-      };
-
-      const handleError = (err: Error) => {
-        setError('Error reading from stdin: ' + err.message);
-        setIsLoading(false);
-        // Decide if the hook should trigger exit or just report the error
-        // exit();
-      };
-
-      const handleEnd = () => {
-        setPipedData(data);
-        setIsLoading(false);
-        // Don't exit here, let the component using the hook decide
-      };
-
-      stdin.on('data', handleData);
-      stdin.on('error', handleError);
-      stdin.on('end', handleEnd);
-
-      // Cleanup listeners
-      return () => {
-        stdin.removeListener('data', handleData);
-        stdin.removeListener('error', handleError);
-        stdin.removeListener('end', handleEnd);
-      };
-    }
-
-    // No piped input (running interactively)
-    setIsLoading(false);
-    // Optionally set an 'info' state or just let isLoading=false & isPiped=false suffice
-    // setError('No piped input detected.'); // Maybe don't treat this as an 'error'
-
-    // Intentionally run only once on mount or when stdin theoretically changes
-  }, [stdin, isRawModeSupported, setRawMode /*, exit */]);
-
-  return { data: pipedData, isLoading, error, isPiped };
-}