start on FileReport class

gcovinator.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/holtrop/gcovinator"
   spec.license       = "MIT"
 
-  spec.files         = Dir["{exe,lib}/**/*", "*.gemspec"]
+  spec.files         = Dir["{assets,exe,lib}/**/*", "*.gemspec"]
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]

lib/gcovinator.rb

@@ -1,9 +1,11 @@
 require_relative "gcovinator/file_coverage"
+require_relative "gcovinator/file_report"
 require_relative "gcovinator/gcov_parser"
 require_relative "gcovinator/version"
-require "tmpdir"
+require "fileutils"
 require "open3"
 require "pathname"
+require "tmpdir"
 
 module Gcovinator
 
@@ -33,6 +35,10 @@ module Gcovinator
           end
         end
       end
+      FileUtils.mkdir_p(output_dir)
+      file_reports = file_coverages.each_with_index.map do |(source_file_name, file_coverage), i|
+        FileReport.new(source_file_name, file_coverage, source_dirs, output_dir, sprintf("s%04d.html", i))
+      end
     end
 
   end

lib/gcovinator/file_report.rb

@@ -0,0 +1,47 @@
+module Gcovinator
+  class FileReport
+
+    def initialize(source_file_name, file_coverage, source_dirs, output_dir, report_file_name)
+      @source_file_name = clean_source_file_name(source_file_name, source_dirs)
+      @report_file_name = report_file_name
+      @total_lines = 0
+      @covered_lines = 0
+      @total_branches = 0
+      @covered_branches = 0
+      run(source_file_name, File.join(output_dir, report_file_name))
+    end
+
+    private
+
+    def clean_source_file_name(source_file_name, source_dirs)
+      source_dirs.each do |source_dir|
+        prefix_test = "#{source_dir}/"
+        if source_file_name.start_with?(prefix_test)
+          return source_file_name[prefix_test.size, source_file_name.size]
+        end
+      end
+      source_file_name
+    end
+
+    def run(source_file_name, output_file_name)
+      require "erb"
+      source_file = read_source_file(source_file_name)
+      source_file_lines = source_file.lines.to_a
+      file_report_template = File.read(File.join(File.dirname(__FILE__), "../../assets/file_report.html.erb"))
+      erb = ERB.new(file_report_template, nil, "<>")
+      report = erb.run(binding.clone)
+      File.open(output_file_name, "w") do |fh|
+        fh.write(report)
+      end
+    end
+
+    def read_source_file(source_file_name)
+      begin
+        File.read(source_file_name)
+      rescue
+        %[<Could not open #{source_file_name}>]
+      end
+    end
+
+  end
+end