Wraps all Tamil lines in a file with OpenLP formatting tags

openlpformatter.groovy

/**
* Wraps all Tamil lines in a file with openlp formatting tags.
*/
import groovy.transform.Field

@Field static final String PULLI = "\u0bcd";

if(args.length > 0) {
    def file = new File(args[0])
    if(file.exists()) {
        File formattedFile = formatFile(file, file.getParentFile())
        if(formattedFile.exists()) {
            formattedFile.renameTo(file)
        }
    } else {
        println "$file doesn't exist"
    }
} else {
    println "Usage: groovy <script-name> <file>"
}

static File formatFile(File file, File targetDir) {
    def target = new File(targetDir, "converted-" + file.getName())
    StringBuilder builder = new StringBuilder();
    file.withReader("UTF-8") {
        def line
        while ((line = it.readLine()) != null) {
            if (line != null && line != "" ) {
                if(isTamilText(line)) {
                    println("Formatting the line ${line}")
                    builder.append(wrapWithFormattingTag(line)).append("\r\n")
                } else {
                    builder.append(line).append("\r\n")
                }
            } else {
                builder.append("\r\n")
            }
        }
    }
    target.withWriter("UTF-8") {
        it.write(builder.toString())
    }
    return target;
}

static boolean isTamilText(String line) {
    return line.contains(PULLI);
}

static String wrapWithFormattingTag(String line) {
    return "{y}"+ line + "{/y}"
}