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From "Rebhan, Gilbert" <Gilbert.Reb...@huk-coburg.de>
Subject RE: how to set a property based on the contents of files in a tree?
Date Tue, 06 Nov 2007 13:21:13 GMT
 



-----Original Message-----
From: Jay Dickon Glanville [mailto:dickon.glanville@gmail.com] 
Sent: Monday, November 05, 2007 7:37 PM
To: Ant User
Subject: how to set a property based on the contents of files in a tree?

/*
Hello all,

I'm doing something, but I'm not sure I'm doing it the best way
possible.  So, I thought I'd ask the experts.

What I want to do is set a property if at least one file in a
directory tree contains a regular expression X.  Here's what I'm
doing:

Create a fileset containing all files that match this condition:
  <fileset dir="WebInfra/Source" id="fileset" includes="**/*">
    <containsregexp expression="dg" />
  </fileset>

Convert that fileset to a string that contains the filenames in the
fileset:
  <pathconvert pathsep="--" property="files_path" refid="fileset" />

Set the property if the filename string is longer then 0:
  <condition property="prop_from_condition" value="true">
    <length string="${files_path}" trim="true" when="greater" length="0"
/>
  </condition>

So, is this the best way to set a property to true if a directory tree
contains a file that matches a RegEx?  Is there a better way?
*/

If it works for you, then it's OK

if it gets more complicated i would start with a basic scriptdef like
the following example and add more logic when i need =

<scriptdef name="checkFiles" language="ruby">
<attribute name="dir" />
<attribute name="extension" />
<attribute name="regex" />
<attribute name="prop" />
<![CDATA[
 filesfound=""
 regex=/#{$attributes.get("regex")}/
     
 Dir[$attributes.get("dir")+'/'+$attributes.get("extension")].each do
|path|
  if File.open(path).read.scan(regex)
    filesfound += path + " "
   end
 end

 if filesfound != ""     
   $project.log "[checkfiles] Regex matches in == " + filesfound
   $project.setProperty "#{$attributes.get('prop')}", "true"
 end
]]>
</scriptdef>


usage  =

recursive or not via extension attribute, f.e.
extension="*.txt"
also fileextension, f.e.
extension="**/*.xml"

example =

<checkFiles 
    dir="Y:/test"
    extension="**/*.*"
    regex="dg"
    prop="prop_from_condition"
/>
   
<echo>
$${prop_from_condition} == ${prop_from_condition}
</echo>

gives you =

[checkfiles] Regex matches in == Y:/test/foo.txt
Y:/test/bla/foo/fooo.txt Y:/test/bla/foo/bar/foobar/bla.txt
Y:/test/bla/foo/bar/foobar/blaa.txt
     [echo] ${prop_from_condition} == true


Regards, Gilbert






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