feat(ui): add command line arg to disable prompts

refs #233
- adds a `--no-prompt` global option that will cause ui.prompt to throw
- dry up prompt spinner handling code

Author: acburdine

lib/bootstrap.js

@@ -95,6 +95,11 @@ module.exports = {
                 describe: 'Enable verbose output',
                 type: 'boolean'
             })
+            .options('prompt', {
+                describe: 'Disable UI prompting (useful for bash scripting)',
+                type: 'boolean',
+                default: true
+            })
             .version()
             .help()
             .parse(argv);

lib/command.js

@@ -108,7 +108,8 @@ class Command {
         let verbose = argv.verbose;
 
         let ui = new UI({
-            verbose: verbose
+            verbose: verbose,
+            allowPrompt: argv.prompt
         });
         let service = ServiceManager.load(ui);
         let context = {

lib/ui.js

@@ -17,7 +17,8 @@ const defaultOptions = {
     stdin: process.stdin,
     stdout: process.stdout,
     stderr: process.stderr,
-    verbose: false
+    verbose: false,
+    allowPrompt: true
 };
 
 class UI {
@@ -29,6 +30,7 @@ class UI {
         this.stdout = this.options.stdout;
         this.stderr = this.options.stderr;
         this.verbose = this.options.verbose;
+        this.allowPrompt = this.options.allowPrompt;
 
         // Add custom prompt module that uses the
         // specified streams
@@ -68,15 +70,11 @@ class UI {
     }
 
     prompt(prompts) {
-        if (!this.spinner) {
-            return this.inquirer(prompts);
+        if (!this.allowPrompt) {
+            throw new errors.SystemError('Prompts have been disabled, please provide options via command line flags');
         }
 
-        this.spinner.stop();
-        return this.inquirer(prompts).then((result) => {
-            this.spinner.start();
-            return result;
-        });
+        return this.noSpin(() => this.inquirer(prompts));
     }
 
     sudo(command, options) {