Locates the user's Arduino 1.5.X or earlier sketchbook folder

findArduinoSketchbook.js

// locates the user's Arduino 1.5.X or earlier sketchbook folder
// 1.5.X folders are returned via STDOUT with a return code of 0
// if only a pre 1.5.X folder can be found, it is also returned via STDOUT, but with a return code of 2
// if no folder can be found, a return code of 1 is returned and STDOUT lets you know that no folder can be found

// tested and known working on:

// OSX 10.9.5

// Windows 7 Ultimate SP1 (build 7601)
// Windows XP 32-bit SP3 (build 2600)
// Windows 8.1 64 bit (build 9600)

// Ubuntu x86 64 12.04.5 LTS
// Ubuntu x86 64 14.04 LTS
// Ubuntu x86 14.04 LTS

var os = require('os');
var osenv = require('osenv');
var fs = require('fs');

var sketchbookPath = "sketchbook.path=";

if(os.type()=="Darwin"){
	var newPathToPrefs = osenv.home() + "/Library/Arduino15/preferences.txt";
	var oldPathToPrefs = osenv.home() + "/Library/Arduino/preferences.txt";
} else if(os.type()=="Windows_NT") {
	var newPathToPrefs = process.env.APPDATA + "\\Arduino15\\preferences.txt";
	var oldPathToPrefs = process.env.APPDATA + "\\Arduino\\preferences.txt";
} else if(os.type()=="Linux"){
	var newPathToPrefs = osenv.home() + "/.arduino15/preferences.txt";
	var oldPathToPrefs = osenv.home() + "/.arduino/preferences.txt";
} else {
	quitCantFind;
}

if(newPathToPrefs!=""){

	var oldPrefsExists = false;
	var newPrefsExists = false;

	if(fs.existsSync(oldPathToPrefs, fs.F_OK)){
		oldPrefsExists = true;
	}

	if(fs.existsSync(newPathToPrefs, fs.F_OK)){
		newPrefsExists = true;
	}

	var LineByLineReader;

	if(oldPrefsExists && !newPrefsExists){
		LineByLineReader = require('line-by-line'), lr = new LineByLineReader(oldPathToPrefs);
	} else if(newPrefsExists){
		LineByLineReader = require('line-by-line'), lr = new LineByLineReader(newPathToPrefs);
	} else {
		quitCantFind();
	}

	lr.on('error', function (err) {
		quitCantFind();
	  // 'err' contains error object
	});

	lr.on('line', function (line) {
		if(line.indexOf(sketchbookPath)>-1){
			if(oldPrefsExists && !newPrefsExists){
				quitOnlyOld(line.substr(line.indexOf(sketchbookPath) + sketchbookPath.length).trim());
			} else if(newPrefsExists){
				quitGood(line.substr(line.indexOf(sketchbookPath) + sketchbookPath.length).trim());
			} else {
				quitCantFind();
			}
		}
    // 'line' contains the current line without the trailing newline character.
	});

	lr.on('end', function () {
		quitCantFind(); 	// should never get here - means we reached the end of the file without 
											// finding the sketchbook path
	  // All lines are read, file is closed now.
	});

} else {
	quitCantFind();
}

function quitOnlyOld(path){
	console.log(path);
	process.exit(2);
}

function quitCantFind(){
	console.log("Can't locate Arduino Sketchbook folder");
	process.exit(1);
}

function quitGood(path){
	console.log(path);
	process.exit(0);
}