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Posted to user@ant.apache.org by Georg-Johann Lay <Ge...@web.de> on 2009/01/16 20:03:36 UTC

[ant] Determining relative paths resp. substring?

Hi,

can anyone assist me in solving this following quite trivial problem?

Given a path A and the current directory B=. derermine B relative to A. 
This is needed for prefixes in zipfileset.

In the special case that I am after B is a subdirectory (of some level) 
of A. So gettig the relative path B-A means that A and B look like this:

A=<sting1>
B=<sting1><string2>

I wasted hours to figure out how this could be achieved... The regex 
stuff is too complicated because dirs may contain special chars like 
blanke, ., \, /, -, $ and even *.

How can I easily remove the prexix A from B? I bet it is a one-liner.

Are there low level string utilities like getting substrings, prefixes, etc?

Thanks in advance,

Georg-Johann


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Re: [ant] Determining relative paths resp. substring?

Posted by Patrick Martin <an...@gmail.com>.
Hello,

I think you can strip the prefix by using <pathconvert> with a <map>.

Cheers,

Patrick

On Sat, Jan 17, 2009 at 11:32 PM, Georg-Johann Lay <av...@gjlay.de> wrote:
> Georg-Johann Lay schrieb:
>>
>> Hi,
>>
>> can anyone assist me in solving this following quite trivial problem?
>>
>> Given a path A and the current directory B=. derermine B relative to A.
>> This is needed for prefixes in zipfileset.
>>
>> In the special case that I am after B is a subdirectory (of some level) of
>> A. So gettig the relative path B-A means that A and B look like this:
>>
>> A=<sting1>
>> B=<sting1><string2>
>>
>> I wasted hours to figure out how this could be achieved... The regex stuff
>> is too complicated because dirs may contain special chars like blanke, ., \,
>> /, -, $ and even *.
>>
>> How can I easily remove the prexix A from B? I bet it is a one-liner.
>
> Hallo again. Eventuelly the time was not wasted. I am using the following
> code. It is not exactly removing a prefix; it's a little bit more:
>
> <macrodef name="set">
>    <attribute name="property" />
>    <attribute name="string" />
>    <sequential>
>        <property name="@{property}" value="@{string}"/>
>    </sequential>
> </macrodef>
>
> <tempfile property="prefix.file" />
>
> <macrodef name="unprefix">
>    <attribute name="property"/>
>    <attribute name="prefix"/>
>    <attribute name="string"/>
>    <sequential>
>        <echo message=".string.suffix.@{property}=!!@{string}"
> file="${prefix.file}" />
>        <replace file="${prefix.file}" token="=!!@{prefix}" value="=!!" />
>        <replace file="${prefix.file}" token="\" value="/" />
>        <replaceregexp file="${prefix.file}" match="//*"   replace="/" />
>        <replaceregexp file="${prefix.file}" match="=!!/*" replace="=" />
>        <property file="${prefix.file}" />
>        <property name="@{property}" value="${.string.suffix.@{property}}"/>
>        <delete file="${prefix.file}" deleteonexit="true" />
>    </sequential>
> </macrodef>
>
> Maybe someone finds is useful.
>
> Grüß, Georg-Johann
>
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Re: [ant] Determining relative paths resp. substring?

Posted by Georg-Johann Lay <av...@gjlay.de>.
Georg-Johann Lay schrieb:
> Hi,
> 
> can anyone assist me in solving this following quite trivial problem?
> 
> Given a path A and the current directory B=. derermine B relative to A. 
> This is needed for prefixes in zipfileset.
> 
> In the special case that I am after B is a subdirectory (of some level) 
> of A. So gettig the relative path B-A means that A and B look like this:
> 
> A=<sting1>
> B=<sting1><string2>
> 
> I wasted hours to figure out how this could be achieved... The regex 
> stuff is too complicated because dirs may contain special chars like 
> blanke, ., \, /, -, $ and even *.
> 
> How can I easily remove the prexix A from B? I bet it is a one-liner.

Hallo again. Eventuelly the time was not wasted. I am using the 
following code. It is not exactly removing a prefix; it's a little bit more:

<macrodef name="set">
     <attribute name="property" />
     <attribute name="string" />
     <sequential>
         <property name="@{property}" value="@{string}"/>
     </sequential>
</macrodef>

<tempfile property="prefix.file" />

<macrodef name="unprefix">
     <attribute name="property"/>
     <attribute name="prefix"/>
     <attribute name="string"/>
     <sequential>
         <echo message=".string.suffix.@{property}=!!@{string}" 
file="${prefix.file}" />
         <replace file="${prefix.file}" token="=!!@{prefix}" value="=!!" />
         <replace file="${prefix.file}" token="\" value="/" />
         <replaceregexp file="${prefix.file}" match="//*"   replace="/" />
         <replaceregexp file="${prefix.file}" match="=!!/*" replace="=" />
         <property file="${prefix.file}" />
         <property name="@{property}" 
value="${.string.suffix.@{property}}"/>
         <delete file="${prefix.file}" deleteonexit="true" />
     </sequential>
</macrodef>

Maybe someone finds is useful.

Grüß, Georg-Johann

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