Add deploy chat command [ci skip]

app/models/environment.rb

@@ -19,7 +19,7 @@ class Environment < ActiveRecord::Base
             allow_nil: true,
             addressable_url: true
 
-  delegate :stop_action, to: :last_deployment, allow_nil: true
+  delegate :stop_action, :manual_actions, to: :last_deployment, allow_nil: true
 
   scope :available, -> { with_state(:available) }
   scope :stopped, -> { with_state(:stopped) }
@@ -99,4 +99,12 @@ class Environment < ActiveRecord::Base
     stop
     stop_action.play(current_user)
   end
+
+  def actions_for(environment)
+    return [] unless manual_actions
+
+    manual_actions.select |action|
+      action.expanded_environment_name = environment
+    end
+  end
 end

lib/gitlab/chat_commands/deploy.rb

+module Gitlab
+  module ChatCommands
+    class Deploy < BaseCommand
+      def self.match(text)
+        /\Adeploy\s+(?<from>.*)\s+to+\s+(?<to>.*)\z/.match(text)
+      end
+
+      def self.help_message
+        'deploy <environment> to <target-environment>'
+      end
+
+      def self.allowed?(project, user)
+        can?(user, :create_deployment, project)
+      end
+
+      def execute(match)
+        from = match[:from]
+        to = match[:to]
+
+        environment = project.environments.find_by(name: from)
+        return unless environment
+
+        actions = environment.actions_for(to)
+        return unless actions.any?
+
+        if actions.one?
+          actions.first.play(current_user)
+        else
+          Result.new(:error, 'Too many actions defined')
+        end
+      end
+    end
+  end
+end

lib/gitlab/chat_commands/result.rb

+module Gitlab
+  module ChatCommands
+    Result = Struct.new(:type, :message)
+  end
+end

lib/mattermost/presenter.rb

@@ -24,20 +24,22 @@ module Mattermost
         end
       end
 
-      def present(resource)
-        return not_found unless resource
-
-        if resource.respond_to?(:count)
-          if resource.count > 1
-            return multiple_resources(resource)
-          elsif resource.count == 0
-            return not_found
+      def present(subject)
+        return not_found unless subject
+
+        if subject.is_a?(Gitlab::ChatCommands::Result)
+          show_result(subject)
+        elsif subject.respond_to?(:count)
+          if subject.try(:many?)
+            multiple_resources(subject)
+          elsif subject.count == 0
+            not_found
           else
-            resource = resource.first
+            single_resource(subject)
           end
+        else
+          single_resource(subject)
         end
-
-        single_resource(resource)
       end
 
       def access_denied
@@ -46,6 +48,10 @@ module Mattermost
 
       private
 
+      def show_result(result)
+        ephemeral_response(result.message)
+      end
+
       def not_found
         ephemeral_response("404 not found! GitLab couldn't find what you were looking for! :boom:")
       end
@@ -54,7 +60,7 @@ module Mattermost
         return error(resource) if resource.errors.any? || !resource.persisted?
 
         message = "### #{title(resource)}"
-        message << "\n\n#{resource.description}" if resource.description
+        message << "\n\n#{resource.description}" if resource.try(:description)
 
         in_channel_response(message)
       end
@@ -74,7 +80,10 @@ module Mattermost
       end
 
       def title(resource)
-        "[#{resource.to_reference} #{resource.title}](#{url(resource)})"
+        reference = resource.try(:to_reference) || resource.try(:id)
+        title = resource.try(:title) || resource.try(:name)
+
+        "[#{reference} #{title}](#{url(resource)})"
       end
 
       def header_with_list(header, items)