[ruby-talk:15483] Re: stdin/stdout 'name' ?

On Mon, May 21, 2001 at 03:57:00PM +0100, [e-mail] wrote:
> Renald Buter <[e-mail]> writes:
> 
> > is there a standard 'stdin' and/or 'stdout' "name", e.g. the '-' in perl? I
> > see a reference to something like it when using "Kernel.open('|-')" --- but
> > this seems to be the only/special case?
> 
> You can use STDIN, STDERR, and STDOUT as file objects connected to the
> respective underlying streams.
> 
> You can also read from ARGF, which is the concatenated input stream
> formed by all the files specified on the program's command line, or
> stdin if none were specified. Thus
> 
>    ARGF.each do |line|
>    end
> 
> is roughly equivalent to Perl's
> 
>   while (<>) {
>     $line = $_;
>   }
> 
> 
Hmmm... I think I was a bit unclear in my request. What I meant was; are
there strings object that map directly onto $stdin or $stdout when used in
File.open(string), e.g.:

	f = File.open('-')	# f is $stdin
	g = File.open('>-')	# g is $stdout
	h = File.open('-',"w")	# h is $stdout

This would allow me to have simple default names in methods that are
also HUMAN READABLE:

	def open_file(infile='-',outfile='>-')
		puts "Reading from #{infile} to #{outfile}"
		# ^^^ this would not output things like <IO:blabla> but
		#     proper names

		# ... use infile, outfile ...
	end

Or am I thinking to perlish here, and is there a better way to map the STD*
objects from AND onto string objects?

Renald