Module generator finishes for partially existing files

This resolves #219. When generating a new module, if all the files to
generate already exist then it fails as before. If some of the files
already exist, then the files that need to be created are created. Any
existing files are not changed.

Also added a bunch of tests for this feature via rspec. Run them from
the test folder with `rake spec`.

.gitignore

@@ -1,4 +1,5 @@
 build/
+test/sandbox
 .DS_Store
 examples/example_1/test1.out
 examples/example_1/test2.out

auto/generate_module.rb

@@ -187,14 +187,24 @@ class UnityModuleGenerator
 
     files = files_to_operate_on(module_name, pattern)
 
-    #Abort if any module already exists
+    #Abort if all of the module files already exist
+    all_files_exist = true
     files.each do |file|
-      raise "ERROR: File #{file[:name]} already exists. Exiting." if File.exist?(file[:path])
+      if not File.exist?(file[:path])
+        all_files_exist = false
       end
+    end
+    raise "ERROR: File #{files[0][:name]} already exists. Exiting." if all_files_exist
 
     # Create Source Modules
     files.each_with_index do |file, i|
-      FileUtils.mkdir_p(File.dirname(file[:path]), :verbose => false) # Create the path first if necessary.
+      # If this file already exists, don't overwrite it.
+      if File.exist?(file[:path])
+        puts "File #{file[:path]} already exists!"
+        next
+      end
+      # Create the path first if necessary.
+      FileUtils.mkdir_p(File.dirname(file[:path]), :verbose => false)
       File.open(file[:path], 'w') do |f|
         f.write("#{file[:boilerplate]}\n" % [file[:name]]) unless file[:boilerplate].nil?
         f.write(file[:template] % [ file[:name],

test/rakefile

@@ -10,9 +10,11 @@ $verbose = false
 require 'rake'
 require 'rake/clean'
 require UNITY_ROOT + 'rakefile_helper'
+require 'rspec/core/rake_task'
 
 TEMP_DIRS = [
-	File.join(UNITY_ROOT, 'build')
+	File.join(UNITY_ROOT, 'build'),
+	File.join(UNITY_ROOT, 'sandbox')
 ]
 
 TEMP_DIRS.each do |dir|
@@ -40,6 +42,11 @@ task :scripts => [:prepare_for_tests] do
   end
 end
 
+desc "Run all rspecs"
+RSpec::Core::RakeTask.new(:spec) do |t|
+  t.pattern = 'spec/**/*_spec.rb'
+end
+
 desc "Generate test summary"
 task :summary do
   report_summary

test/spec/generate_module_existing_file_spec.rb

@@ -0,0 +1,158 @@
+
+require '../auto/generate_module.rb'
+require 'fileutils'
+
+def touch_src(file)
+  FileUtils.touch "sandbox/src/#{file}"
+end
+
+def touch_test(file)
+  FileUtils.touch "sandbox/test/#{file}"
+end
+
+def create_src_with_known_content(file)
+  File.open("sandbox/src/#{file}", "w") {|f| f.write("the original #{file}")}
+end
+
+def create_test_with_known_content(file)
+  File.open("sandbox/test/#{file}", "w") {|f| f.write("the original #{file}")}
+end
+
+def expect_src_content_didnt_change(file)
+  expect(File.read("sandbox/src/#{file}")).to eq("the original #{file}")
+end
+
+def expect_test_content_didnt_change(file)
+  expect(File.read("sandbox/test/#{file}")).to eq("the original #{file}")
+end
+
+def expect_src_file_to_exist(file)
+  expect(File.exist?("sandbox/src/#{file}")).to be true
+end
+
+def expect_test_file_to_exist(file)
+  expect(File.exist?("sandbox/test/#{file}")).to be true
+end
+
+describe "UnityModuleGenerator" do
+
+  before do
+    # clean sandbox and setup our "project" folders
+    FileUtils.rm_rf "sandbox"
+    FileUtils.mkdir_p "sandbox"
+    FileUtils.mkdir_p "sandbox/src"
+    FileUtils.mkdir_p "sandbox/test"
+
+    @options = {
+      :path_src => "sandbox/src",
+      :path_tst => "sandbox/test",
+    }
+  end
+
+  context "with src pattern" do
+    before do
+      @options[:pattern] = "src"
+    end
+
+    it "fails when all files already exist" do
+      # create an existing triad of files
+      touch_src "meh.c"
+      touch_src "meh.h"
+      touch_test "Testmeh.c"
+      expect {
+        UnityModuleGenerator.new(@options).generate("meh")
+      }.to raise_error("ERROR: File meh already exists. Exiting.")
+    end
+
+    it "creates the test file if the source and header files exist" do
+      # Create the existing files.
+      touch_src "meh.c"
+      touch_src "meh.h"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_test_file_to_exist "Testmeh.c"
+    end
+
+    it "does not alter existing files" do
+      # Create some files with known content.
+      create_src_with_known_content "meh.c"
+      create_src_with_known_content "meh.h"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_src_content_didnt_change "meh.c"
+      expect_src_content_didnt_change "meh.c"
+    end
+
+    it "does not alter existing test files" do
+      # Create some files with known content.
+      create_test_with_known_content "Testmeh.c"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_test_content_didnt_change "Testmeh.c"
+    end
+
+  end
+
+  context "with mch pattern" do
+    before do
+      @options[:pattern] = "mch"
+    end
+
+    it "fails when all files exist" do
+        touch_src "meh_model.c"
+        touch_src "meh_conductor.c"
+        touch_src "meh_hardware.c"
+        touch_src "meh_model.h"
+        touch_src "meh_conductor.h"
+        touch_src "meh_hardware.h"
+        touch_test "Testmeh_model.c"
+        touch_test "Testmeh_conductor.c"
+        touch_test "Testmeh_hardware.c"
+        expect {
+          UnityModuleGenerator.new(@options).generate("meh")
+        }.to raise_error("ERROR: File meh_model already exists. Exiting.")
+    end
+
+    it "creates files that don't exist" do
+      touch_src "meh_model.c"
+      touch_src "meh_conductor.c"
+      touch_src "meh_hardware.c"
+      touch_src "meh_model.h"
+      touch_src "meh_conductor.h"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_src_file_to_exist "meh_hardware.h"
+      expect_test_file_to_exist "Testmeh_model.c"
+      expect_test_file_to_exist "Testmeh_conductor.c"
+      expect_test_file_to_exist "Testmeh_hardware.c"
+    end
+
+    it "does not alter existing source files" do
+      create_src_with_known_content "meh_model.c"
+      create_src_with_known_content "meh_model.c"
+      create_src_with_known_content "meh_model.c"
+      create_src_with_known_content "meh_model.h"
+      create_src_with_known_content "meh_model.c"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_src_content_didnt_change "meh_model.c"
+      expect_src_content_didnt_change "meh_model.c"
+      expect_src_content_didnt_change "meh_model.c"
+      expect_src_content_didnt_change "meh_model.c"
+    end
+
+    it "does not alter existing test files" do
+      create_test_with_known_content "Testmeh_model.c"
+
+      UnityModuleGenerator.new(@options).generate("meh")
+
+      expect_test_content_didnt_change "Testmeh_model.c"
+    end
+
+  end
+end