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?? Editing: Streams.php

<?php

namespace cli;

class Streams {

protected static $out = STDOUT;
	protected static $in = STDIN;
	protected static $err = STDERR;

static function _call( $func, $args ) {
		$method = __CLASS__ . '::' . $func;
		return call_user_func_array( $method, $args );
	}

static public function isTty() {
		if ( function_exists('stream_isatty') ) {
			return stream_isatty(static::$out);
		} else {
			return (function_exists('posix_isatty') && posix_isatty(static::$out));
		}
	}

/**
	 * Handles rendering strings. If extra scalar arguments are given after the `$msg`
	 * the string will be rendered with `sprintf`. If the second argument is an `array`
	 * then each key in the array will be the placeholder name. Placeholders are of the
	 * format {:key}.
	 *
	 * @param string   $msg  The message to render.
	 * @param mixed    ...   Either scalar arguments or a single array argument.
	 * @return string  The rendered string.
	 */
	public static function render( $msg ) {
		$args = func_get_args();

// No string replacement is needed
		if( count( $args ) == 1 || ( is_string( $args[1] ) && '' === $args[1] ) ) {
			return Colors::shouldColorize() ? Colors::colorize( $msg ) : $msg;
		}

// If the first argument is not an array just pass to sprintf
		if( !is_array( $args[1] ) ) {
			// Colorize the message first so sprintf doesn't bitch at us
			if ( Colors::shouldColorize() ) {
				$args[0] = Colors::colorize( $args[0] );
			}

// Escape percent characters for sprintf
			$args[0] = preg_replace('/(%([^\w]|$))/', "%$1", $args[0]);

return call_user_func_array( 'sprintf', $args );
		}

// Here we do named replacement so formatting strings are more understandable
		foreach( $args[1] as $key => $value ) {
			$msg = str_replace( '{:' . $key . '}', $value, $msg );
		}
		return Colors::shouldColorize() ? Colors::colorize( $msg ) : $msg;
	}

/**
	 * Shortcut for printing to `STDOUT`. The message and parameters are passed
	 * through `sprintf` before output.
	 *
	 * @param string  $msg  The message to output in `printf` format.
	 * @param mixed   ...   Either scalar arguments or a single array argument.
	 * @return void
	 * @see \cli\render()
	 */
	public static function out( $msg ) {
		fwrite( static::$out, self::_call( 'render', func_get_args() ) );
	}

/**
	 * Pads `$msg` to the width of the shell before passing to `cli\out`.
	 *
	 * @param string  $msg  The message to pad and pass on.
	 * @param mixed   ...   Either scalar arguments or a single array argument.
	 * @return void
	 * @see cli\out()
	 */
	public static function out_padded( $msg ) {
		$msg = self::_call( 'render', func_get_args() );
		self::out( str_pad( $msg, \cli\Shell::columns() ) );
	}

/**
	 * Prints a message to `STDOUT` with a newline appended. See `\cli\out` for
	 * more documentation.
	 *
	 * @see cli\out()
	 */
	public static function line( $msg = '' ) {
		// func_get_args is empty if no args are passed even with the default above.
		$args = array_merge( func_get_args(), array( '' ) );
		$args[0] .= "\n";

self::_call( 'out', $args );
	}

/**
	 * Shortcut for printing to `STDERR`. The message and parameters are passed
	 * through `sprintf` before output.
	 *
	 * @param string  $msg  The message to output in `printf` format. With no string,
	 *                      a newline is printed.
	 * @param mixed   ...   Either scalar arguments or a single array argument.
	 * @return void
	 */
	public static function err( $msg = '' ) {
		// func_get_args is empty if no args are passed even with the default above.
		$args = array_merge( func_get_args(), array( '' ) );
		$args[0] .= "\n";
		fwrite( static::$err, self::_call( 'render', $args ) );
	}

/**
	 * Takes input from `STDIN` in the given format. If an end of transmission
	 * character is sent (^D), an exception is thrown.
	 *
	 * @param string  $format  A valid input format. See `fscanf` for documentation.
	 *                         If none is given, all input up to the first newline
	 *                         is accepted.
	 * @param boolean $hide    If true will hide what the user types in.
	 * @return string  The input with whitespace trimmed.
	 * @throws \Exception  Thrown if ctrl-D (EOT) is sent as input.
	 */
	public static function input( $format = null, $hide = false ) {
		if ( $hide )
			Shell::hide();

if( $format ) {
			fscanf( static::$in, $format . "\n", $line );
		} else {
			$line = fgets( static::$in );
		}

if ( $hide ) {
			Shell::hide( false );
			echo "\n";
		}

if( $line === false ) {
			throw new \Exception( 'Caught ^D during input' );
		}

return trim( $line );
	}

/**
	 * Displays an input prompt. If no default value is provided the prompt will
	 * continue displaying until input is received.
	 *
	 * @param string      $question The question to ask the user.
	 * @param bool|string $default  A default value if the user provides no input.
	 * @param string      $marker   A string to append to the question and default value
	 *                              on display.
	 * @param boolean     $hide     Optionally hides what the user types in.
	 * @return string  The users input.
	 * @see cli\input()
	 */
	public static function prompt( $question, $default = false, $marker = ': ', $hide = false ) {
		if( $default && strpos( $question, '[' ) === false ) {
			$question .= ' [' . $default . ']';
		}

while( true ) {
			self::out( $question . $marker );
			$line = self::input( null, $hide );

if ( trim( $line ) !== '' )
				return $line;
			if( $default !== false )
				return $default;
		}
	}

/**
	 * Presents a user with a multiple choice question, useful for 'yes/no' type
	 * questions (which this public static function defaults too).
	 *
	 * @param string  $question  The question to ask the user.
	 * @param string  $choice    A string of characters allowed as a response. Case is ignored.
	 * @param string  $default   The default choice. NULL if a default is not allowed.
	 * @return string  The users choice.
	 * @see cli\prompt()
	 */
	public static function choose( $question, $choice = 'yn', $default = 'n' ) {
		if( !is_string( $choice ) ) {
			$choice = join( '', $choice );
		}

// Make every choice character lowercase except the default
		$choice = str_ireplace( $default, strtoupper( $default ), strtolower( $choice ) );
		// Seperate each choice with a forward-slash
		$choices = trim( join( '/', preg_split( '//', $choice ) ), '/' );

while( true ) {
			$line = self::prompt( sprintf( '%s? [%s]', $question, $choices ), $default, '' );

if( stripos( $choice, $line ) !== false ) {
				return strtolower( $line );
			}
			if( !empty( $default ) ) {
				return strtolower( $default );
			}
		}
	}

/**
	 * Displays an array of strings as a menu where a user can enter a number to
	 * choose an option. The array must be a single dimension with either strings
	 * or objects with a `__toString()` method.
	 *
	 * @param array   $items    The list of items the user can choose from.
	 * @param string  $default  The index of the default item.
	 * @param string  $title    The message displayed to the user when prompted.
	 * @return string  The index of the chosen item.
	 * @see cli\line()
	 * @see cli\input()
	 * @see cli\err()
	 */
	public static function menu( $items, $default = null, $title = 'Choose an item' ) {
		$map = array_values( $items );

if( $default && strpos( $title, '[' ) === false && isset( $items[$default] ) ) {
			$title .= ' [' . $items[$default] . ']';
		}

foreach( $map as $idx => $item ) {
			self::line( '  %d. %s', $idx + 1, (string)$item );
		}
		self::line();

while( true ) {
			fwrite( static::$out, sprintf( '%s: ', $title ) );
			$line = self::input();

if( is_numeric( $line ) ) {
				$line--;
				if( isset( $map[$line] ) ) {
					return array_search( $map[$line], $items );
				}

if( $line < 0 || $line >= count( $map ) ) {
					self::err( 'Invalid menu selection: out of range' );
				}
			} else if( isset( $default ) ) {
				return $default;
			}
		}
	}

/**
	 * Sets one of the streams (input, output, or error) to a `stream` type resource.
	 *
	 * Valid $whichStream values are:
	 *    - 'in'   (default: STDIN)
	 *    - 'out'  (default: STDOUT)
	 *    - 'err'  (default: STDERR)
	 *
	 * Any custom streams will be closed for you on shutdown, so please don't close stream
	 * resources used with this method.
	 *
	 * @param string    $whichStream  The stream property to update
	 * @param resource  $stream       The new stream resource to use
	 * @return void
	 * @throws \Exception Thrown if $stream is not a resource of the 'stream' type.
	 */
	public static function setStream( $whichStream, $stream ) {
		if( !is_resource( $stream ) || get_resource_type( $stream ) !== 'stream' ) {
			throw new \Exception( 'Invalid resource type!' );
		}
		if( property_exists( __CLASS__, $whichStream ) ) {
			static::${$whichStream} = $stream;
		}
		register_shutdown_function( function() use ($stream) {
			fclose( $stream );
		} );
	}

}