From: Jim Freeze <jim@...>
Date: 2002-05-09T08:31:49+09:00
Subject: Re: Want application to read file or from pipe

On Thu, May 09, 2002 at 06:59:10AM +0900, Tim Hammerquist wrote:
> Jim Freeze graced us by uttering:
> 
> $ cat filter.rb
> #!/usr/local/bin/ruby -w
> 
> while gets
>   # each line given in $_ for each iteration
>   puts "you gave me: #$_"
> end

Close, but I am looking for something without the
while and gets statements. Something more like readlines.

Here is my meager attempt:

cat pipe.rb 
#! /usr/local/bin/ruby

if 1 == ARGV.size
  lines = IO.readlines(ARGV[0])
else
  lines = $stdin.read.split(/\n/)
end

p lines

jfreeze@rabbit ('tty') ~/tmp 29 -> cat pipe.rb | ./pipe.rb 
["#! /usr/local/bin/ruby", "", "if 1 == ARGV.size", "  lines = IO.readlines(ARGV[0])", "else", "  lines = $stdin.read.split(/\\n/)", "end", "", "p lines"]

jfreeze@rabbit ('tty') ~/tmp 30 -> ./pipe.rb pipe.rb 
["#! /usr/local/bin/ruby\n", "\n", "if 1 == ARGV.size\n", "  lines = IO.readlines(ARGV[0])\n", "else\n", "  lines = $stdin.read.split(/\\n/)\n", "end\n", "\n", "p lines\n"]


They are close, but splitting on \n is asking for trouble.
Is there a better way to do this?
--
Jim Freeze
If only I had something clever to say for my comment...
~