From: Robert Klemme <shortcutter@...>
Date: 2011-05-25T18:53:29+09:00
Subject: Re: ARGV, STDIN and gets

On Wed, May 25, 2011 at 7:05 AM, Daniel C. <daniel_antonio_n@yahoo.com> wrote:
> Prakash Murthy wrote in post #929972:
>> Nobuyoshi Nakada wrote:
>>> Hi,
>>>
>>> At Sat, 25 Apr 2009 07:43:28 +0900,
>>> Joe Williams wrote in [ruby-talk:334959]:
>>>> I am running into an issue where I have a script that takes two command
>>>> line arguments and reads from stdin. It seems that gets is not getting
>>>> to stdin because it is hitting ARGV first
>>>
>>> Kernel#gets is not a method to read from stdin.
>>>
>>> Use $stdin.gets.
>>
>> Thanks Nobuyoshi!
>>
>> I used $stdin.gets. instead of gets. and that solved the problem I was
>> facing!
>
> The solution is more very easy, like this:
>
> var2 = ARGV[1].clone
> ARGV.clear
> var3 = gets
>
> its work! not need STDIN! :) no error more.

Why do you clone when the next thing that you do is clearing ARGV?
That seems superfluous.

For one argument I would do

arg = ARGV.shift or abort "ERROR: need at least one argument"

For more arguments I'd probably do

arg1, arg2 = ARGV.slice! 0, 2
abort "Need two arguments!" unless arg2

gets # reads stdin or from file if there are more arguments

If there is a need for more complex argument processing I would use
OptionParser anyway.

OptionParser.new do |opts|
...
end.parse! ARGV # removes options

Kind regards

robert


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