Using a Gradle Task as a data-driven file generator

CopyTaskAsAsGenerator.gradle

// Uses a single Groovy template and multiple sets of text input files.
// It generates a set of Groovy source files using the content of the text input files to set tokens within the
// template file.
task generateGroovySources( type : Copy ) {

    from 'examples', {
        include '*.txt'
    }

    into "${buildDir}/generated-src"

    eachFile { fcd ->
        String sourceName = fcd.sourceName.replaceAll( /\.txt$/, '')
        String content = fcd.file.text
        fcd.filter {null}
        fcd.filter ConcatFilter, append : project.file('src/templates/my.template')
        fcd.filter ReplaceTokens, tokens : [
            token1 : content,
            token2 : sourceName
        ]
    }

    rename ~/\.txt$/, '.groovy'
}