feat: remove deprecated fs.exists function; enable setting the gpio path by setting up configuration for the whole module

Author: makeros

lib/gpio.js

@@ -2,7 +2,6 @@ var fs = require('fs');
 var util = require('util');
 var path = require('path');
 var EventEmitter = require('events').EventEmitter;
-var exists = fs.exists || path.exists;
 
 var gpiopath = '/sys/class/gpio/';
 
@@ -40,12 +39,15 @@ var _unexport = function(number, fn) {
 		if(typeof fn === 'function') fn();
 	}, 1);
 };
+
 var _export = function(n, fn) {
-	if(exists(gpiopath + 'gpio'+n)) {
+	try {
+		fs.accessSync(gpiopath + 'gpio'+n)
 		// already exported, unexport and export again
 		logMessage('Header already exported');
 		_unexport(n, function() { _export(n, fn); });
-	} else {
+
+	} catch (e) {
 		logMessage('Exporting gpio' + n);
 		_write(n, gpiopath + 'export', function(err) {
 			// if there's an error when exporting, unexport and repeat
@@ -61,7 +63,7 @@ var _testwrite = function(file, fn) {
 			return;
 		}
 		fs.close(fd, function(err){
-			fn(true, null);	
+			fn(true, null);
 		});
 	});
 };
@@ -202,7 +204,7 @@ GPIO.prototype.setDirection = function(dir, fn) {
 				self.emit('directionChange', dir);
 			}
 		}, 1);
-	
+
 	});
 };
 
@@ -252,4 +254,6 @@ GPIO.prototype.reset = function(fn) { this.set(0, fn); };
 exports.logging = false;
 exports.export = function(headerNum, direction) { return new GPIO(headerNum, direction); };
 exports.unexport = _unexport;
-
+exports.setConfig = function (config) {
+	gpiopath = config.gpiopath || gpiopath
+}