tasks: add common task util module

Author: etpinard

tasks/util/common.js

@@ -0,0 +1,47 @@
+var fs = require('fs');
+var exec = require('child_process').exec;
+
+exports.execCmd = function(cmd, cb) {
+    exec(cmd, function(err) {
+        if(err) throw err;
+        if(cb) cb();
+    })
+    .stdout.pipe(process.stdout);
+};
+
+exports.writeFile = function(filePath, content, cb) {
+    fs.writeFile(filePath, content, function(err) {
+        if(err) throw err;
+        if(cb) cb();
+    });
+};
+
+exports.doesDirExist = function(dirPath) {
+    try {
+        if(fs.statSync(dirPath).isDirectory()) return true;
+    }
+    catch(e) {
+        return false;
+    }
+
+    return false;
+};
+
+exports.doesFileExist = function(filePath) {
+    try {
+        if(fs.statSync(filePath).isFile()) return true;
+    }
+    catch(e) {
+        return false;
+    }
+
+    return false;
+};
+
+exports.touch = function(filePath) {
+    fs.closeSync(fs.openSync(filePath, 'w'));
+};
+
+exports.throwOnError = function(err) {
+    if(err) throw err;
+};