From: "Andreas S." <f@...>
Date: 2006-01-01T07:06:06+09:00
Subject: Re: my stupid code ...

unknown wrote:
> Hi,
> I'm trying to write a small ruby script which accepts:
>   1. Input : File or $stdin
>   2. Output : File or $stdout
> 
> This is my stupid code:
> #---------------------------------------------------------
> def do_some_thing(str)
>   # do some things over str
> end
> 
> f_in = ARGV[0]
> f_out = ARGV[1]
> if f_out==nil
>   fout = File.open(f_out,"w")
> end
> 
> if f_in==nil
>   $stdin.each { |line|
>     if f_out==nil
>        print do_some_thing(line)
>     else
>        fout.print do_some_thing(line)
>     end
>   }
> else
>   File.open(f_in,"r").each {|line|
>     if f_out==nil
>        print do_some_thing(line)
>     else
>        fout.print do_some_thing(line)
>     end
>   }
> end
> fout.close if f_out!=nil

fin = ARGV[0] ? File.open(ARGV[0],'r') : $stdin
fout = ARGV[1] ? File.open(ARGV[1], 'w') : $stdin
fin.each_line do |line|
  fout.print do_some_thing(line)
end

Or (hides File.open errors):
fin = File.open(ARGV[0],'r') rescue $stdin
fout = File.open(ARGV[1], 'w') rescue $stdout
fin.each_line do |line|
  fout.print do_some_thing(line)
end

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