Added ability to specify a shell used to run script

config/config.html

@@ -5,8 +5,22 @@ <h2>
 
 <p class="help-text">
   The following scripts execute from inside your project directory.
-  You can use `pwd` or `$PWD` to get the path within your script.
+  In Bash, Powershell, or the POSIX shell, you can use `pwd` or `$PWD` to get the path within your script.
+  In the default Windows shell, you can get the current directory by using `cd` with no arguments.
 </p>
+<h3>Shell</h3>
+<div class="row-fluid">
+  <div class="span12">
+    <p class="help-text">
+      Choose which shell to use to execute your scripts.
+    </p>
+  </div>
+</div>
+<div class="row-fluid">
+  <div class="span6">
+    <select ng-model="config.shell" ng-options="value for value in ['Default Shell', 'Bash', 'Powershell']"></select>
+  </div>
+</div>
 <h3>Environment</h3>
 <div class="row-fluid">
   <div class="span12">

webapp.js

@@ -2,6 +2,7 @@
 module.exports = {
   config: {
     custom: {
+      shell: { type: String, default: 'Default', enum: ['Default Shell', 'Bash', 'Powershell']},
       environment: {type: String, default: '# type shell commands here'},
       prepare: {type: String, default: '# type shell commands here'},
       test: {type: String, default: '# type shell commands here'},

worker.js

@@ -7,16 +7,16 @@ module.exports = {
     var config = config || {};
 
     done(null, {
-      environment: shellCommand(config.environment, job),
-      prepare: shellCommand(config.prepare, job),
-      test: shellCommand(config.test, job),
-      deploy: shellCommand(config.deploy, job),
-      cleanup: shellCommand(config.cleanup, job)
+      environment: shellCommand(config.environment, config.shell, job),
+      prepare: shellCommand(config.prepare, config.shell, job),
+      test: shellCommand(config.test, config.shell, job),
+      deploy: shellCommand(config.deploy, config.shell, job),
+      cleanup: shellCommand(config.cleanup, config.shell, job)
     });
   }
 };
 
-function shellCommand(command, job) {
+function shellCommand(command, shell, job) {
   if (!command) {
     return;
   }
@@ -29,8 +29,27 @@ function shellCommand(command, job) {
 
   var commandToExecute = compileScript(job, normalizedCommand);
 
+  if ((/bash/i).test(shell)) {  
+    return {
+      command: 'bash',
+      args: ['-e', '-x', '-c', commandToExecute]
+    };
+  }
+  else if ((/powershell/i).test(shell)) {
+    return {
+      command: 'powershell',
+      args: ['-NonInteractive', '-Command', commandToExecute]
+    }
+  }
+  else if (process.platform === 'win32') {
+    return {
+      command: 'cmd',
+      args: ['/c', commandToExecute]
+    }
+  }
+
   return {
-    command: 'bash',
+    command: 'sh',
     args: ['-e', '-x', '-c', commandToExecute]
   };
 }