Convert CSV to YAML with Gradle

build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.xlson.groovycsv:groovycsv:1.1'
        classpath 'org.yaml:snakeyaml:1.18'
    }
}

task csv2yaml {
    def csvFile = file('utterances.csv') // CSV should contain tmin and tmax columns
    def yamlFile = file('utterances.yaml')
    inputs.files csvFile
    outputs.files yamlFile
    doLast {
        def csv = com.xlson.groovycsv.CsvParser.parseCsv(csvFile.newReader()).collect {
            [start: it.tmin as float, end: it.tmax as float]
        }
        def opts = new org.yaml.snakeyaml.DumperOptions()
        opts.defaultFlowStyle = org.yaml.snakeyaml.DumperOptions.FlowStyle.BLOCK
        def yaml = new org.yaml.snakeyaml.Yaml(opts)
        yaml.dump(csv, yamlFile.newWriter())
    }
}