From: Robert Klemme <bob.news@...>
Date: 2006-01-05T02:13:03+09:00
Subject: Re: gets bug?

James Edward Gray II wrote:
> On Jan 4, 2006, at 9:17 AM, Shea Martin wrote:
>
>>
>> <snip>
>> if ARGV.size > 0
>>    puts "first arg is #{ARGV[0]}"
>> end
>> puts "enter text"
>> ans = gets
>> puts "you said #{ans}"
>> </snip>
>>
>> Run this code, as ./test.rb.  Then run it with an command line arg,
>> like "./test.rb -x".  And you will get an error like this:
>>
>>   "test.rb:3:in `gets': No such file or directory - -x
>> (Errno::ENOENT)"
>>
>> The fix I have found, is to change gets to $stdin.gets.  I saw some
>> traffic on the mailing list archives regarding this, but no
>> resolution.
>>
>> Is this expected behaviour?
>
> Yes it is.  Kernel.gets() reads from files specified as command-line
> options or STDIN, if none were given.  This makes it easy to write
> Unix-style filters.
>
> You can always shift the option out of ARGV before calling gets()
> with something like:
>
> if ARGV.first == "-x"
>    ARGV.shift
>    # ...
> end

I'd prefer to use OptionParser.parse! for this - but otherwise totally
agree.

    robert