Re: [nant-dev] New to the list

[Ian MacLean]

how about:
to-string() or to-delimited-string() which is a bit of a mouthful ?
oh and why not fileset::count() instead of or as well as 
fileset::is-empty() ?

Ian

Horsfield, Peter A wrote:

Please don't call it flatten.

That's already used in the context of taking files from subdirectories
and placing them in one single directory.
On the other hand the ability to arbitrarily take a list of items and create
a 
single delimited array would be useful to me. I already have C# embedded 
scripts that do this for arrays of properties. 

This concatenation could be done for any Collection that could be
enumerated. 
Is this the case for filesets?

Two cents,

Peter

-----Original Message-----
From: Jaroslaw Kowalski [mailto:[EMAIL PROTECTED] 
Sent: Friday, March 19, 2004 10:24 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [nant-dev] New to the list

I'd like to propose a new function set that would help solve the issue of
generating a classpath from a list of files. The functions deal with named
filesets like this:
<project>
   <fileset id="zzz">
       <includes name="*.cs" />
   </fileset>
   <fileset id="rrr">
       <includes name="*.csu7987987" />
   </fileset>
   <echo message="flatten: ${fileset::flatten('zzz',';')}" />
   <echo message="exists: ${fileset::exists('zzz')}" />
   <echo message="exists: ${fileset::exists('zzz2')}" />
   <echo message="is-empty: ${fileset::is-empty('zzz')}" />
   <echo message="is-empty: ${fileset::is-empty('rrr')}" />
   <echo message="file-count: ${fileset::get-file-count('zzz')}" />
   <echo message="file-name[0]: ${fileset::get-file-name('zzz',0)}" />
</project>
Proposed implementation is attached (no help yet, but if we decide this
should go in, I'll write some help text).
With this you'd be able to do:

<fileset id="jarfiles">
   <includes name="${ant.home}/lib/*.jar" />
</fileset>
<exec commandline "...-classpath ${fileset::flatten('jarfiles',';')}...  "
/>
I believe that this technique would be useful in many more places. Should I
commit?
Jarek

----- Original Message ----- 
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 19, 2004 2:57 PM
Subject: [nant-dev] New to the list

 



Hi everyone!  I joined this list because there are some differences
   

between
 

Nant and Ant which have been causing me trouble.  I wanted to post my 
solutions in the hopes that they may be useful.  If it's stuff that's 
already been thought of, just tell me to shut up :)

The first problem I ran up against was running Ant from Nant.  On the 
Windows platform, Ant is run through a batch file which does not 
communicate the program exit code.  So the Nant build always believes 
that the Ant build succeeded.  To get around this, I actually call the 
Java class file like so:

       <exec
           program="${java.home}/bin/java.exe"
           workingdir="${mbpa.home}"
           commandline="-classpath ${ant.cp} 
org.apache.tools.ant.launch.Launcher build"
           failonerror="true"
           />

This is obviously not a problem, however getting the classpath correct 
is
   

a
 

pain because you have to add all the jars in the ant/lib directory 
since Nant doesn't have any clue what a Java classpath is.  To achieve 
this, I wrote a little script:

       <script language="C#">
           <code><![CDATA[
               public static void ScriptMain( Project project ) {
                   string ald = project.Properties["ant.home"] + "/lib";
                   string jh = project.Properties["java.home"];
                   string cp = jh + "/lib/tools.jar";
                   DirectoryInfo di = new DirectoryInfo(ald);
                   FileInfo[] files = di.GetFiles("*.jar");
                   foreach (FileInfo fi in files)
                       cp += ";" + ald + "/" + fi.Name;
                   project.Properties["ant.cp"] = cp;
               }
           ]]></code>
       </script>
It's a simple script and it has been working very well for me.  Is 
there a better way to do this?  I guess what I want to achieve 
eventually is an
   

Ant
 

task for Nant.  I imagine it would require that a Java task also be 
created.  Is anybody else working on this kind of thing?  I'd 
appreciate some suggestions on what it would take to start working on 
an Ant task. And if you don't think this is desirable, please speak up 
so that I don't waste my time.

Alright, the second thing I ran into is a big annoyance to me.  Ant 
has
   

the
 

ability to load a properties file using the following:

   <property file="build.properties" />

I could not find anything similar to this in Nant, so please tell me 
if I just missed something.  I want to share a properties file between 
Nant and Ant, so I needed something that would load the properties 
from that file. To do this, I wrote the following script outside of a 
target:

   <script language="C#">
       <code><![CDATA[
           public static void ScriptMain( Project project ) {
               try {
                   string prop_file = project.Properties["prop.file"];
                   using (StreamReader sr = new 
StreamReader(prop_file))
   

{
 

                       string line;
                       while ((line = sr.ReadLine()) != null) {
                           Regex re = new 
Regex("^\\s*([\\w_\\-\\.]+)\\s*=\\s*(.*?)\\s*$");
                           if (re.IsMatch(line)) {
                               Match m = re.Match(line);
                               string prop_name = m.Groups[1].ToString();
                               string prop_val = m.Groups[2].ToString();
                               // The following line does semantic 
processing on the property before
                               // adding it to the list of properties.
                               prop_val = 
project.Properties.ExpandProperties(prop_val, Location.UnknownLocation);
                               project.Properties[prop_name] = prop_val;
                           }
                       }
                   }
               }
               catch (Exception exc) {
                   throw new BuildException("Exception caught while 
loading properties file:\n" + exc.Message);
               }
           }
       ]]></code>
   </script>

This is also a bit of functionality that I'd like to add to Nant.  
This code doesn't verify the property file at all, it just finds lines 
that
   

look
 

like properties and ignores the rest.  Also, there's this line:

   prop_val = project.Properties.ExpandProperties(prop_val,
Location.UnknownLocation);
This line seems troublesome to me because if something later changes 
one
   

of
 

those properties, the dependent properties will not change.  I did try 
to mark the properties as dynamic through the PropertyDictionary, but 
Nant comes back with an error explaining that MarkDynamic is not 
defined.  Any suggestions on how to fix this?  And how much validation 
would be required for a properties file in order to add the same 
properties file
   

capabilities
 

that Ant has to Nant?

Thanks for your time,

Dustin



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--
Ian MacLean, Developer, 
ActiveState, a division of Sophos
http://www.ActiveState.com



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