Prepare java classes for word cloud

build.gradle

task prepareForWordCloud(type: Exec) {
    def forbiddenLines = ["import", "package"]
    def forbiddenWords = [
        "{", "}", "(", ")", "\\[", "\\]", "\\.", "\\;", "\"", "@", ",",
        "=", "+", "-", "\\/", "*", ">", "<", "!", "&&", "||"]
    commandLine("bash", "-c", """
        find -name "*.java" | 
        xargs cat | 
        sed '${forbiddenWords.collect {"s/$it/ /g; "}.join()} ${forbiddenLines.collect {"/$it/d"}.join(";")}' | 
        tr '[:upper:]' '[:lower:]' |
        sed -E -e 's/^[[:blank:]]+//g' | 
        sed -E -e 's/[[:blank:]]{2,}/ /g' |
        sed -E -e '/^\$/d'
    """)
}