Javascript (NodeJS): A simple script for extracting parts in a textfile between two regex matching lines. #snippet

filterFile.js

// Filter File
//   a simple script for extracting parts in a textfile between two lines.
//   by Calle Robertsson, [email protected], 2013.

var fs = require('fs');

var filename = process.argv[2];

if (!filename) {
  throw new Error('Missing command line argument for file name.');
}

var StartRegex = /^GRANT.*/;
var EndRegex   = /^\s*$/;
var IncludeEnd = false;
var AddEmptyRow = true;

fs.readFile(filename, 'utf8', function (err, data) {
	if (err) throw err;
	parse(data);
});

function parse(text) {

	var rows = text.split('\n');

	var outRow = false;

	for (var i in rows) {

		var row = rows[i];

		if (StartRegex.exec(row)) {
			if (AddEmptyRow) {
				console.log('');
			}
			outRow = true;
		}
		else if (EndRegex.exec(row)) {
			if (IncludeEnd) {
				console.log(row);
			}
			outRow = false;
		}

		if (outRow) {
			console.log(row);
		}
	}

	console.log('');
}

// eof