From: Alain Helfenstein <a-helfenstein@...>
Date: 2009-01-02T19:02:36+09:00
Subject: Re: Ruby Command Line One Liner

David A. Black wrote:
> Hi --
> 
> On Fri, 2 Jan 2009, Alain Helfenstein wrote:
> 
>> ruby -i.bak -p -e 'puts ARGF.read.gsub(/.*(?=package)/m,"/**\n * foo.bar
>> 2001-2009\n\ **/\n")' test/Test.java
>>
>> Does anybody have a idea on how to solve this problem for all *.java
>> files in the test directory?
> 
> The -p flag will do the read/write loop for you, so all you have to do
> is something like this:
> 
> $ cat abc.txt
> hello
> $ cat def.txt
> goodbye
> 
> $ ruby -pi.bak -e '$_.upcase!' abc.txt def.txt
> 
> $ cat abc.txt
> HELLO
> $ cat def.txt
> GOODBYE
> 
> 
> David
> 
> --
> David A. Black / Ruby Power and Light, LLC
> Ruby/Rails consulting & training: http://www.rubypal.com
> Coming in 2009: The Well-Grounded Rubyist (http://manning.com/black2)
> 
> http://www.wishsight.com => Independent, social wishlist management!

Thanks a lot for your answer.

The problem of the -p flag is, that the input stream is read line by 
line. Then the regex /.*(?=package)/ will only be applied to one line. 
But I want to remove all lines before the line starting with "package".
See the following example:

/**
 * header
 **/
package test;
...

The result of the replacement looks like this:

/**
 * foo.bar
 **/
package test;
...

If I use the one-liner at the top of the message with an input like 
'test/Tes*.java' then the ARGF stream does somehow not differ between 
the different files.

Best regards, Alain.

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