Bugs item #940942, was opened at 2004-04-23 21:45
Message generated for change (Comment added) made by mslusar
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=402868&aid=940942&group_id=31650
Category: Documentation
Group: 0.8.4.0
Status: Open
Resolution: None
Priority: 5
Submitted By: Kevin Sagon (ksagon)
Assigned to: Gert Driesen (drieseng)
Summary: if & unless attribute of target tag
Initial Comment:
The if and unless attributes of the target tag are
documented and are intended to function on the
premise that they will "sense" the existence or non-
existence of the property specified by their value.
Unfortunately it looks as if they are coded so that if the
property exists then an attempt is made to convert the
value to a boolean and return that result. If I am
reading the code right the value that is used for
conversion is the value of the property specified, this
will usually result in a conversion error as the value of
the property was not intended to be used in this way.
Indeed, the presence of the property is all that should
be checked for to stay consistent with both the
documentation and the Java version of the same
functionality.
The code in question is in the Target.cs source lines
108-117 (if attribute) and lines 148-157 (unless
attribute).
If you would like more details please feel free to contact
me.
----------------------------------------------------------------------
Comment By: MArcin Slusarczyk (mslusar)
Date: 2004-07-20 11:55
Message:
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Example presented by drieseng :
<target name="dunno" if="${file::exists('test.txt')}">
....
</target>
Does not work for me. I got error:
Property 'file::exists('build.xml')' has not been set.
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Comment By: explorer (junp50)
Date: 2004-06-29 19:39
Message:
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I followed the instructions posted by drieseng, but I still
got errors
INTERNAL ERROR
System.FormatException: String was not recognized as a valid
Boolean.
at System.Boolean.Parse(String value)
at System.Convert.ToBoolean(String value)
at NAnt.Core.Tasks.IfTask.get_ConditionsTrue() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmpsrc\NAnt.Core\Tasks\IfTask.cs:line 271
at NAnt.Core.Tasks.IfTask.ExecuteTask() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmp\src\NAn
t.Core\Tasks\IfTask.cs:line 333
at NAnt.Core.Task.Execute() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmp\src\NAnt.Core\Task.
cs:line 176
at NAnt.Core.Target.Execute() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmp\src\NAnt.Core\Tar
get.cs:line 249
at NAnt.Core.Project.Execute(String targetName, Boolean
forceDependencies) in C:\DOCUME~1\driesen
g\LOCALS~1\Temp\tmp15EB.tmp\src\NAnt.Core\Project.cs:line 870
at NAnt.Core.Project.Execute() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmp\src\NAnt.Core\Pr
oject.cs:line 827
at NAnt.Core.Project.Run() in
C:\DOCUME~1\drieseng\LOCALS~1\Temp\tmp15EB.tmp\src\NAnt.Core\Projec
t.cs:line 895
Please send bug report to [EMAIL PROTECTED]
----------------------------------------------------------------------
Comment By: Gert Driesen (drieseng)
Date: 2004-05-02 10:04
Message:
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user_id=707851
Kevin,
This is actually a documentation issue. The NAnt developers
took a departure from their Ant counterpart on this topic, and
forgot to update the docs accordingly.
In NAnt the if and unless attributes expect an expression that
evaluates to either true or false.
To be honest : when I first started working on NAnt I didn't
agree with this departure from Ant's logic too, but that
departure does allow us to have expressions in the if and
unless attributes now, without breaking any existing builds.
Right now, you could have a target executed only if a certain
file exists, without having to use intermediate properties to
hold a bool indicating whether the file exists or not :
<target name="dunno" if="${file::exists('test.txt')}">
....
</target>
I'm updating the category of this bug report
to "Documentation", and wil fix the docs in the next few
days ...
Thanks for the report !
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