How to replace string in a file using NANT?

Question

I am trying to replace the occurance of a string in a wxs file using Nant.

I have only found the following example, which uses <replaceString>, but it seems like it can only be used within the copied files. Are there any other way of replacing a string, without actually copying the files over?

<property name="NOW" value="${datetime::now()}" />
<copy todir="out">
    <fileset basedir="in">
        <include name="**/*" />
    </fileset>
    <filterchain>
        <replacetokens>
            <token key="NOW" value="${TODAY}" />
        </replacetokens>
        <tabstospaces />
    </filterchain>
</copy>

Chaconne

Answer 1

Here's the code:

<loadfile file="token.txt" property="token-file">
    <filterchain>
        <replacetokens>
            <token key="NOW" value="${datetime::now()}" />
        </replacetokens>
    </filterchain>
</loadfile>

The official NAnt docs for <loadfile> element contain the exact sample you need. See the bottom of the page.

Quar

this almost worked for me, what it was missing was echo'ing the file back out to replace the old one - #487951 – Gentlewoman

Answer 2

Here's how I did it.

<loadfile file="${file}" property="file.content">
    <filterchain>
        <replacestring from="StringToMatch" to="StringToReplace" ignorecase="true" />
    </filterchain>
</loadfile>
<echo file="${file}">${file.content}</echo>

Disavowal

Answer 3

So you are trying to modify a .wxs file which is XML, right?

In this particular case you might use <xmlpoke> if you are able to determine the position of the strings to replace via XPath.

Scirrhous

Answer 4

I found a solution for you here: http://frank.overseakids.com/?p=182

<loadfile file=”${dir.template}\template.db_name.sql” property=”restore.db.sql.db_name”>
<filterchain>
<replacetokens>
<!– this looks for tokens like @blah.blah@ in the file being loaded and replaces them–>
<token key=”restore.db.prefix” value=”${restore.db.prefix}” />
<token key=”backup.file.path” value=”${backup.file.path}” />
</replacetokens>
</filterchain>
</loadfile>
<property name=”current.db” value=”db_name” />
<property name=”current.log” value=”${dir.log}\${restore.db.logfile.prefix}_db_name.log” />
<property name=”current.file” value=”${dir.template}\restore.db_name.tmp.sql” />
<delete if=”${file::exists(current.file)}” file=”${current.file}” />
<echo file=”${current.file}”>${restore.db.sql.db_name}</echo>

You can wrap this in a <foreach /> element.

Steal

Answer 5

I never managed to get the filterchain and replacetokens to work properly. I ended up using this and it works great.

<replacetext filename="${filename}" src="stringToBeReplaced" replacement="replacementString" />

Affirmation

Answer 6

All these answers did not work for me, maybe because I needed to replace a string with spaces in it. Loading a file content with filterchain/replacetokens did nothing to the contents of the associated property. Maybe I'm using it wrong.
The tasks "replacestring" and "replacetext" suggested by @Ally and @John Sterne do not exist.

It's included in a Jenkins build process, thus the ENVIRONMENT variable must be set to the working dir.

    <loadfile file="./my/batch.bat" property="file.content" />
    <property name="file.content"
              value="${string::replace(file.content, 'D:\path to\the working\space', environment::get-variable('WORKSPACE'))}" />
    <property name="file.content"
              value="${string::replace(file.content, 'Cd C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin', 'CD /D C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin')}" />
    <echo file="./my/batch.bat">${file.content}</echo>

Chalcidice

Answer 7

I had that problem today. To solve it I used the move command instead of loadfile or copy. This worked for me because since my file was pretty small. The other caution about this is that replacetokens needs a start identifier and end identifier of the token; begintoken and endtoke respectively. If those are not set the default values are the @ symbol. So if you want to replace a value such as MY_SERVER_PLACE_HOLDER that means the value in your file must be @MY_SERVER_PLACE_HOLDER@. If you want your token to start with something different than you should specify the begintoken and endtoken values. That should give you an idea of the problems the begin token and endtoken will bring you.

So here is what I did in a nutshell

1. Moved the file to a temporary location. In that move I used filterchain with removetokens to change the values in the file.
2. In step 2, I moved the file back to it's original location.
3. I then used the delete command to delete the temp folder I created.

Here is a what I did. (May not be syntactically correct since I am not in front of the code at the moment)

    <move todir="temp">
       <fileset basedir="in">
         <include name="myfile.dat" />
       </fileset>
       <filterchain>
          <replacetokens>
             <token key="MY_SERVER_PLACE_HOLDER" value="http://www.someserver.com" />
          </replacetokens>
          <tabstospaces />
      </filterchain>
    </move>
    <move todir="in">
       <fileset basedir="temp">
           <include name="myfile.dat" />
       </fileset>
    </move>
    <delete dir="temp" />

Mosra