From: Brett Williams <brettandbecky@...>
Date: 2008-02-13T01:27:36+09:00
Subject: Re: Ruby equivalent to source command

Robert Klemme wrote:
> 2008/2/12, Brett Williams <brettandbecky@gmail.com>:
>> This works as I would like, with the exception of local variables
>> present in the sourced file.  For example, if I had something like this
>> in the sourced file:
>>
>> x = "value set in sourced file"
>>
>> then I get an error :  undefined local variable or method 'x'
> 

[snip]

> Or are you seeing this:
> 
> 17:05:25 ~
> $ echo "x=123" | ruby -e 'eval(ARGF.read, binding); puts x'
> -e:1: undefined local variable or method `x' for main:Object (NameError)
> 17:06:31 ~
> $
> 
>> unless I extend the scope of x by setting it before sourcing the file.
> 
> Like
> 
> 17:06:31 ~
> $ echo "x=123" | ruby -e 'x=1; eval(ARGF.read, binding); puts x'
> 123
> 17:07:32 ~
> $

Precisely.

> This is because local variables are detected at compile time.  That's
> why Ruby thinks "x" in my bit above is a method because there is no
> assignment.

Aye, that's the problem.

>> Is there any way to accomplish what I want?  I could work around this by
>> sticking to instance variables or *gulp* global variables for this
>> application, but before I throw in the towel I wanted to throw this out
>> to people here.
> 
> A global is probably much more appropriate here.  If the code you
> source somehow generates configuration settings then maybe you can set
> a global Hash that will receive values.  It depends on the larger
> context of what you want to achieve.

I figured this was the case.  I'll go with globals for my context.

>> P.S.:  Things have changed since I was a pretty regular poster back in
>> 2002-2003... ;)
> 
> Does this have to do with your email address? ;-)  If yes, congrats
> and greetings to Becky!

Indeed no.  Becky predates even my Ruby (which I started using as my 
primary language in 2001).  I'm just very happy to see this list 
mirrored on ruby-forum which makes it much more convenient for me 
personally.  The email address is one not used for much -- it functions 
mainly as a spam magnet =)
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