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Groovy - Plain Text Word Wrap Method

12.03.2007
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        // Groovy Method to perform word-wrap to a specified length.
// Returns a List of strings representing the wrapped text

// Quick and Dirty method for plain text word-wrap to a specified width
static class TextUtils {
	
	static String[] wrapntab(input, linewidth = 70, indent = 0) throws IllegalArgumentException {
		if(input == null)
			throw new IllegalArgumentException("Input String must be non-null")
		if(linewidth <= 1)
			throw new IllegalArgumentException("Line Width must be greater than 1")
		if(indent <= 0)
			throw new IllegalArgumentException("Indent must be greater than 0")
		
		def olines = []
		def oline = " " * indent
		
		input.split(" ").each() { wrd ->
			if( (oline.size() + wrd.size()) <= linewidth ) {
				oline <<= wrd <<= " "
			}else{
				olines += oline
				oline = " " * indent
			}
		}
		olines += oline
		return olines
	}
}

// TEST
// the input String
input = "Note From SUPPLIER: Booking confirmed by fax.  4 standard rooms - 3 twin shared, 1 single room, please advise if guests require meals.. "

// call static wrapntab method to break the input string into 70 char wide lines with a 4 char initial indent
olines = TextUtils.wrapntab(input,70,4)

// print the output
olines.each() {
	println it
}