Add arbitrary configuration settings to liftoffrc

This allows the user to set arbitrary build configurations on a
per-build configuration basis. This is handled by the new `extra_config`
key in `liftoffrc`.

lib/liftoff.rb

@@ -24,3 +24,4 @@
 require 'liftoff/template_generator'
 require 'liftoff/version'
 require 'liftoff/xcodeproj_helper'
+require 'liftoff/xcodeproj_monkeypatch'

lib/liftoff/launchpad.rb

@@ -30,6 +30,8 @@ def perform_project_actions
       treat_warnings_as_errors
       add_script_phases
       enable_static_analyzer
+      perform_extra_config
+      save_project
       generate_git
     end
 
@@ -65,6 +67,10 @@ def enable_warnings
       xcode_helper.enable_warnings(@config.warnings)
     end
 
+    def perform_extra_config
+      xcode_helper.perform_extra_config(@config.extra_config)
+    end
+
     def enable_static_analyzer
       xcode_helper.enable_static_analyzer(@config.enable_static_analyzer)
     end

lib/liftoff/project_configuration.rb

@@ -16,7 +16,8 @@ class ProjectConfiguration
       :use_cocoapods,
       :run_script_phases,
       :strict_prompts,
-      :xcode_command
+      :xcode_command,
+      :extra_config
 
     attr_writer :author,
       :company_identifier,

lib/liftoff/xcodeproj_helper.rb

@@ -10,20 +10,16 @@ def treat_warnings_as_errors(enable_errors)
     def enable_warnings(warnings)
       if warnings
         puts 'Setting warnings at the project level'
-        xcode_project.build_configurations.each do |configuration|
-          warnings.each do |warning|
-            configuration.build_settings[warning] = 'YES'
-          end
+        warnings.each do |warning|
+          xcode_project.set_project_settings(warning, 'YES')
         end
       end
     end
 
     def enable_static_analyzer(enable_static_analyzer)
       if enable_static_analyzer
         puts 'Turning on Static Analyzer at the project level'
-        xcode_project.build_configurations.each do |configuration|
-          configuration.build_settings['RUN_CLANG_STATIC_ANALYZER'] = 'YES'
-        end
+        xcode_project.set_project_settings('RUN_CLANG_STATIC_ANALYZER', 'YES')
       end
     end
 
@@ -47,6 +43,27 @@ def add_script_phases(scripts)
       end
     end
 
+    def perform_extra_config(extra_config)
+      if extra_config
+        extra_config.each do |configuration|
+          name, settings = configuration.first
+          if name.downcase == "all"
+            object = target
+          else
+            object = target.build_settings(name)
+          end
+
+          if object
+            settings.each do |setting|
+              setting.each do |key, value|
+                object[key] = value
+              end
+            end
+          end
+        end
+      end
+    end
+
     def save
       xcode_project.save
     end

lib/liftoff/xcodeproj_monkeypatch.rb

@@ -0,0 +1,23 @@
+module Xcodeproj
+  class Project
+    def set_project_settings(key, value)
+      self.build_configurations.each do |configuration|
+        configuration.build_settings[key] = value
+      end
+    end
+  end
+end
+
+module Xcodeproj
+  class Project
+    module Object
+      class PBXNativeTarget
+        def []=(key, value)
+          self.build_configurations.each do |configuration|
+            configuration.build_settings[key] = value
+          end
+        end
+      end
+    end
+  end
+end

man/liftoffrc.5

@@ -256,6 +256,15 @@ file if it can't find one.
 Set this key to
 .Ic false
 to disable the automatic-open functionality
+.It Ic extra_config
+type: array of dictionaries
+.br
+default: none
+.Pp
+Add additional per-configuration settings to the main application target. By
+default this key isn't set. See
+.Sx EXTRA CONFIGURATION
+for more information on the format of this key.
 .El
 .
 .Sh SCRIPT PHASES
@@ -459,6 +468,41 @@ and
 .Ic UnitTests-Prefix.pch
 files.
 .
+.Sh EXTRA CONFIGURATION
+.Ic liftoff
+can perform additional arbitrary configuration to the main application target
+on a per-build configuration basis. In order to add arbitrary settings, you
+should add keys to the
+.Ic extra_config
+key in your
+.Nm
+that correspond to the build configuration you'd like to modify. For example,
+to set all warnings on your
+.Ic Debug
+build configuration, you can set the following:
+.Pp
+.Bd -literal
+extra_config:
+  - Debug:
+    - WARNING_CFLAGS:
+      - -Weverything
+.Ed
+.Pp
+Note that the key for the build configuration must match the name of the build
+configuration you'd like to modify exactly.
+.Pp
+If you would like to set a project-wide setting for the application target, you
+can use the special
+.Ic all
+key in the configuration:
+.Pp
+.Bd -literal
+extra_config:
+  - all:
+    - WARNING_CFLAGS:
+      - -Weverything
+.Ed
+.
 .Sh FILES
 .Pa ~/.liftoffrc
 .