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From Ernst de Haan <er...@pensioenpage.com>
Subject Re: converting ant from a make file
Date Fri, 18 Sep 2009 17:22:23 GMT
I think by now you should read up on Ant and understand the basic  
concepts before proceeding...

Met een vriendelijke groet,


Ernst de Haan
PensioenPage B.V.
www.pensioenpage.com

tel. (026) 364 56 34

Op 18 sep 2009 om 18:53 heeft veena pandit <v.kris21@gmail.com> het  
volgende geschreven:\

> So how would I write it in the build.xml
>
> for c in A B C D E; do
>      perl  -ibak process.pl abc.txt
>      perl -ibak process.pl def.txt
>      perl -ibak proces.pl xyz.txt
>      - mkdir Backup
>     mv *bak Backup
>
> Not clear what this is doing; but it is executing the same pl file  
> against
> different input files.
>
> Sorry, but I don't quite get it yet.
>
> Thanks,
>
> Veena
>
> On Fri, Sep 18, 2009 at 12:41 PM, Ernst de Haan <ernst@pensioenpage.com 
> >wrote:
>
>> The Ant way to process multiple Perl files would be:
>>
>>  <perl dir="src/perl" todir="build" includes="*.pl" />
>>
>> See? It's a different way of thinking...
>>
>> Met een vriendelijke groet,
>>
>>
>> Ernst de Haan
>> PensioenPage B.V.
>> www.pensioenpage.com
>>
>> tel. (026) 364 56 34
>>
>> Op 18 sep 2009 om 17:12 heeft veena pandit <v.kris21@gmail.com> het
>> volgende geschreven:\
>>
>>
>> Do you mind posting a small example of the exec command with the  
>> script:
>>> for c in A B C D E; do?
>>>
>>> Thanks,
>>>
>>> Veena
>>>
>>> On Fri, Sep 18, 2009 at 10:38 AM, John Shott <shott@stanford.edu>  
>>> wrote:
>>>
>>> Veena:
>>>>
>>>> for c in A B C D E; do
>>>>
>>>>>   perl ...
>>>>>  perl ...
>>>>>  perl...
>>>>>  - mkdir Backup
>>>>>   mv *bak Backup
>>>>>
>>>>> How do I move this script over to ant build.xml.
>>>>>
>>>>>
>>>>> This is probably a bit hard to answer.  In principle, you can  
>>>>> simply
>>>> call
>>>> the existing script using something like the exec task along with
>>>> appropriate arg values.  Or, you can consider breaking the script  
>>>> apart
>>>> and
>>>> call individual perl scripts with appropriate arguments.  In  
>>>> general,
>>>> however, I think that you'll be happier if you are able to use the
>>>> built-in
>>>> ant tasks wherever possible and resort to things like the exec  
>>>> task only
>>>> when you absolutely need to.
>>>>
>>>> While I'm not a great authority on either make or ant, I did  
>>>> spend a
>>>> great
>>>> deal of time converting a good sized project with a bunch of  
>>>> Makefiles to
>>>> an
>>>> ant-based build.  My experience is that if you try to simply do a
>>>> line-by-line conversion of your Makefiles into the ant  
>>>> equivalent, that
>>>> you
>>>> will not be terribly happy with the result.  Why?  Ant is not  
>>>> make and
>>>> they
>>>> approach things differently.
>>>>
>>>> I suspect that you'll be a lot happier with the result if you look
>>>> carefully at what Make is doing, make sure that you understand that
>>>> fully,
>>>> and then look at ant to see how some of it's tasks can be  
>>>> harnessed to do
>>>> the same thing.  For example, make tends to do things on a  
>>>> directory by
>>>> directory basis whereas ant has a much more sophisticated (to me at
>>>> least)
>>>> means of specifying filesets that become the target of a task.   
>>>> Also, ant
>>>> now has a wide range of tasks that perform interesting and often  
>>>> complex
>>>> elements of a build in a single step.  You may even find it  
>>>> desirable (if
>>>> you have that flexibility) to restructure your source tree in a  
>>>> more "ant
>>>> friendly" structure.  You may also find that some of the things  
>>>> that your
>>>> Perl scripts are doing are conveniently doable by ant tasks so  
>>>> that when
>>>> everything is done, instead of having a handful of Makefiles plus  
>>>> Perl
>>>> scripts that you may have a single build.xml file.  Of course, not
>>>> knowing
>>>> what your Perl scripts are doing .... they may be doing things  
>>>> that would
>>>> be
>>>> hard to do in ant.
>>>>
>>>> I hope that helps,
>>>>
>>>> John
>>>>
>>>>
>>>>
>>>>
>>>> --- 
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