Gradle java project replaces one line in a file at build time

Question

I have a simple Gradle build script to compile and package (like an application plugin) my Java application. The only thing I do not do is replace the current version number in a simple .properties file.

I created the file 'src / main / resources / app-info.properties' with one line 'application.version = @version @'. No. I want to replace this version line whenever a file is copied to the build folder (think this happens during build).

I have already tried a simple solution with ReplaceTokens ants. This replaced the version, but also broke my .png files in resources.

So, is there a simple solution to just replace the tokens in one file during the build task (or does any task process the copy in the build folder)?

Thanks for any help! Ben

====== Edit based on a comment from Opal =====

Based on the hint, I added the following:

import org.apache.tools.ant.filters.ReplaceTokens // ... build { from('src/main/resources') { include '*.properties' filter(ReplaceTokens, tokens: [version : project.version]) } } 

What causes this error:

Could not find method from () for arguments [src / main / resources, build_vbjud9ah7v3pj5e7c5bkm490b $ _run_closure6_closure12 @ 43ead1a8] in the root project

Does it seem like I'm in the wrong task?

====== Editing the completeness of adding an Opals-based solution offers =====

Thanks to the man, the following working solution!

 processResources { from('src/main/resources') { include '*.properties' filter(ReplaceTokens, tokens: [version : project.version]) } } 

Answer 1

Books and blogs, including an answer from Opal, recommend a vibrant mix of exclude/include , from() and filter() . And, of course, on the first attempt, I replaced the text {{app javascript library}} in the index.html file with the JavaScript library path, which depended on a simple project property setting.

The problem that struck me was that my “military” task produced duplicate index.html files in the military archive and got rid of this problem using the template described earlier, as a result there was one huge unreadable hack.

Then I found a really direct solution. The following example is from my own build script, and you should tweak it a bit to suit your needs:

 war { eachFile { copyDetails -> if (copyDetails.path == 'index.html') { filter { line -> line.replace('{{app javascript library}}', "lib/someLib.js") } } } } 

Answer 2

Insert sample code. What you need to do is include the replacement file and exclude other files from it. An example is used here . Find ReplaceTokens and you'll see what I'm talking about.

You need to add filtering to the processResources task. Code example:

 processResources { def profile = project.properties['profile'] def replace_tokens = profile ? filter_tokens[profile] : filter_tokens['default'] exclude '**/log4j-test.xml' from('src/main/resources') { exclude '**/*.ttf' filter(ReplaceTokens, tokens: replace_tokens) } from('src/main/resources') { include '**/*.ttf' } } 

Above ttf (binary) files are excluded from filtering, but are copied. replace_tokens is a filter taken from a map defined in another part of the script.