feat(heroku): validate names in heroku recipe do not exceed the name …

…limit set by heroku

lib/potassium/recipes/heroku.rb

@@ -1,13 +1,7 @@
 class Recipes::Heroku < Rails::AppBuilder
   NAME_PREFIX = 'pl'
-
-  attr_accessor :app_name_staging
-
-  def initialize(args)
-    super(args)
-    set(:heroku_app_name_staging, app_name_for('staging'))
-    set(:heroku_app_name_production, app_name_for('production'))
-  end
+  ENVIRONMENTS = ['staging', 'production']
+  HEROKU_NAMES_MAX_CHARS = 30
 
   def ask
     heroku = answer(:heroku) do
@@ -16,6 +10,8 @@ def ask
 
     if heroku
       set(:heroku, heroku)
+
+      ENVIRONMENTS.each { |environment| set_app_name_for(environment) }
     end
   end
 
@@ -47,31 +43,34 @@ def add_heroku
     template "../assets/bin/setup_heroku.erb", "bin/setup_heroku", force: true
     run "chmod a+x bin/setup_heroku"
 
-    if logged_in?
-      %w(staging production).each do |environment|
-        create_app_on_heroku(environment)
-      end
-      puts "Remember to connect the github repository to the new pipeline"
-      open_pipeline_command = "\e[33mheroku pipelines:open #{heroku_pipeline_name}\e[0m"
-      puts "run #{open_pipeline_command} to open the dashboard"
-    else
-      puts "You are not logged in into heroku"
-      login_command = "\e[33mheroku login\e[0m"
-      puts "Run #{login_command} and enter your credentials"
-      puts "You can install the heroku recipe again create the app in heroku"
-      install_command = "\e[33mpostassium install heroku --force\e[0m"
-      puts "Just run #{install_command}"
-    end
+    logged_in? ? create_apps : puts_not_logged_in_msg
 
     add_readme_header :deployment
   end
 
+  def create_apps
+    ENVIRONMENTS.each { |environment| create_app_on_heroku(environment) }
+    puts "Remember to connect the github repository to the new pipeline"
+    open_pipeline_command = "\e[33mheroku pipelines:open #{heroku_pipeline_name}\e[0m"
+    puts "run #{open_pipeline_command} to open the dashboard"
+  end
+
+  def puts_not_logged_in_msg
+    puts "You are not logged in into heroku"
+    login_command = "\e[33mheroku login\e[0m"
+    puts "Run #{login_command} and enter your credentials"
+    puts "You can install the heroku recipe again to create the app in heroku"
+    install_command = "\e[33mpostassium install heroku --force\e[0m"
+    puts "Just run #{install_command}"
+  end
+
   def heroku_pipeline_name
-    app_name.dasherize
+    @heroku_pipeline_name ||= valid_heroku_name(app_name.dasherize, 'pipeline')
   end
 
-  def app_name_for(environment)
-    "#{NAME_PREFIX}-#{app_name.dasherize}-#{environment}"
+  def set_app_name_for(environment)
+    default_name = "#{NAME_PREFIX}-#{app_name.dasherize}-#{environment}"
+    set("heroku_app_name_#{environment}".to_sym, valid_heroku_name(default_name, environment))
   end
 
   def logged_in?
@@ -84,7 +83,7 @@ def who_am_i
 
   def create_app_on_heroku(environment)
     rack_env = "RACK_ENV=production"
-    staged_app_name = app_name_for(environment)
+    staged_app_name = get("heroku_app_name_#{environment}".to_sym)
 
     run_toolbelt_command "create #{staged_app_name} --remote #{environment}"
     run_toolbelt_command "labs:enable runtime-dyno-metadata", staged_app_name
@@ -99,14 +98,14 @@ def create_app_on_heroku(environment)
   def set_rails_secrets(environment)
     run_toolbelt_command(
       "config:add SECRET_KEY_BASE=#{generate_secret}",
-      app_name_for(environment)
+      get("heroku_app_name_#{environment}".to_sym)
     )
   end
 
   def set_app_multi_buildpack(environment)
     run_toolbelt_command(
       "buildpacks:set https://github.com/heroku/heroku-buildpack-multi.git",
-      app_name_for(environment)
+      get("heroku_app_name_#{environment}".to_sym)
     )
   end
 
@@ -133,4 +132,12 @@ def run_toolbelt_command(command, app_env_name = nil)
       `heroku #{command} --app #{app_env_name}`
     end
   end
+
+  def valid_heroku_name(name, element)
+    while name.length > HEROKU_NAMES_MAX_CHARS
+      puts "Heroku names must be shorter than #{HEROKU_NAMES_MAX_CHARS} chars."
+      name = Ask.input("Please enter a valid name for #{element}:")
+    end
+    name
+  end
 end