Add "--input-format" parameter in "slather setup" too, so it can enab…

…le CLANG_ENABLE_CODE_COVERAGE instead of GCC_GENERATE_TEST_COVERAGE_FILES

+ Print explicit error when missing parameter for "slather setup"

TODO: improve Xcodeproj gem so my new Xcodeproj::XCScheme implementation also allows to set codeCoverageEnabled = YES in every xcscheme

bin/slather

@@ -120,8 +120,15 @@ Clamp do
 
     parameter "[xcodeproj]", "Path to the xcodeproj", :attribute_name => :xcodeproj_path
 
+    option ["--input-format"], "INPUT_FORMAT", "Input format (gcov, profdata)"
+
     def execute
-      project = Slather::Project.open(xcodeproj_path)
+      xcodeproj_path_to_open = xcodeproj_path || Slather::Project.yml["xcodeproj"]
+      unless xcodeproj_path_to_open
+        raise StandardError, "Must provide an xcodeproj through .slather.yml"
+      end
+      project = Slather::Project.open(xcodeproj_path_to_open)
+      project.input_format = input_format
       project.setup_for_coverage
       project.save
     end

lib/slather/project.rb

@@ -7,10 +7,15 @@
 module Xcodeproj
   class Project
 
-    def slather_setup_for_coverage
+    def slather_setup_for_coverage(input_format = "gcov")
       build_configurations.each do |build_configuration|
         build_configuration.build_settings["GCC_INSTRUMENT_PROGRAM_FLOW_ARCS"] = "YES"
-        build_configuration.build_settings["GCC_GENERATE_TEST_COVERAGE_FILES"] = "YES"
+        if input_format == "profdata"
+          build_configuration.build_settings["CLANG_ENABLE_CODE_COVERAGE"] = "YES"
+          # @todo also activate codeCoverageEnabled = "YES" in every xcscheme's TestAction
+        else
+          build_configuration.build_settings["GCC_GENERATE_TEST_COVERAGE_FILES"] = "YES"
+        end
       end
     end
 
@@ -22,7 +27,9 @@ class Project < Xcodeproj::Project
 
     attr_accessor :build_directory, :ignore_list, :ci_service, :coverage_service, :coverage_access_token, :source_directory, :output_directory, :xcodeproj, :show_html, :input_format, :scheme
 
-    alias_method :setup_for_coverage, :slather_setup_for_coverage
+    def setup_for_coverage
+      slather_setup_for_coverage(self.input_format)
+    end
 
     def self.open(xcodeproj)
       proj = super