Implement concurrent builds limit in settings

app/controllers/settings.coffee

@@ -1,6 +1,13 @@
 `import Ember from 'ember'`
 
 SettingsController = Ember.Controller.extend
+  concurrentBuildsLimitDescription: (->
+    description = "Limit concurrent jobs"
+    if @get('concurrentBuildsLimit')
+      description += ": "
+    description
+  ).property('concurrentBuildsLimit')
+
   envVars: Ember.computed.filterBy('model.envVars', 'isNew', false)
 
   actions:
@@ -10,4 +17,26 @@ SettingsController = Ember.Controller.extend
     sshKeyDeleted: ->
       @set('model.customSshKey', null)
 
+    concurrentBuildsLimitChanged: ->
+      unless @get('concurrentBuildsLimit')
+        return if @get('isSaving')
+        @set('isSaving', true)
+
+        savingFinished = =>
+          @set('isSaving', false)
+
+        @get('repo').saveSettings(maximum_number_of_builds: 0).then(savingFinished, savingFinished)
+        @set('model.settings.maximum_number_of_builds', 0)
+
+    concurrentBuildsLimitValueChanged: ->
+      repo = @get('repo')
+      concurrentBuildsLimit = parseInt(@get('model.settings.maximum_number_of_builds'))
+      if concurrentBuildsLimit
+        @set('isSaving', true)
+        savingFinished = =>
+          @set('isSaving', false)
+
+        repo.saveSettings(maximum_number_of_builds: concurrentBuildsLimit).
+          then(savingFinished, savingFinished)
+
 `export default SettingsController`

app/routes/settings.coffee

@@ -8,6 +8,8 @@ Route = TravisRoute.extend
     controller.set('repo', @modelFor('repo'))
     @controllerFor('repo').activate('settings')
 
+    controller.set('concurrentBuildsLimit', !!model.settings.maximum_number_of_builds)
+
   fetchEnvVars: () ->
     repo = @modelFor('repo')
     repo.get('envVars.promise')

app/templates/components/add-env-var.hbs

@@ -9,7 +9,7 @@
     {{input value=value class="env-value" placeholder="Value"}}
   </div>
   <div class="form-elem">
-    {{travis-switch active=public}}
+    {{travis-switch active=public description="Display value in build log"}}
   </div>
   <div class="form-elem">
     {{#if isSaving}}

app/templates/components/travis-switch.hbs

@@ -6,4 +6,4 @@
     OFF
   </span>
 </div>
-<span class="label">Display value in build log</span>
+<span class="label">{{description}}</span>

app/templates/settings.hbs

@@ -1,12 +1,17 @@
 <div class="settings">
-  
+
   <section class="settings-section">
     <h2 class="small-title">General Settings</h2>
 
     <ul class="settings-list--columns">
       <li>{{settings-switch active=model.settings.builds_only_with_travis_yml repo=repo description="Build only if .travis.yml is present" key="builds_only_with_travis_yml"}}</li>
-      <li>
+      <li>{{travis-switch active=concurrentBuildsLimit description=concurrentBuildsLimitDescription action="concurrentBuildsLimitChanged"}}
-        <div class="settings-input"><input type="text" pattern="/^[0-9]+$/" value="4"></div><span class="label">Concurrent jobs</span>
+        {{#if concurrentBuildsLimit}}
+          {{input pattern="/^[0-9]+$/" value=model.settings.maximum_number_of_builds on="key-up" action="concurrentBuildsLimitValueChanged"}}
+        {{/if}}
+        {{#if isSaving}}
+          {{loading-indicator}}
+        {{/if}}
       </li>
       <li>{{settings-switch active=model.settings.build_pushes repo=repo description="Build pushes" key="build_pushes"}}</li>
       <li>{{settings-switch active=model.settings.build_pull_requests repo=repo description="Build pull requests" key="build_pull_requests"}}</li>