Added comment stats. Only lines beginning with three slashes are counted, since these stats should reflect comments used for documentation, not inline explanations.

config/locales/de.yml

@@ -12,8 +12,10 @@ de:
   commits_by_hour: Commits in der Stunde
   files: Dateien
   lines: Zeilen
+  comments: Kommentare
   files_by_date: Dateien nach Datum
   lines_by_date: Zeilen nach Datum
+  comments_by_date: Kommentare nach Datum
   files_by_extension: Dateien nach Erweiterungen
   lines_by_extension: Zeilen nach Erweiterungen
   hour_of_day: Tagesstunden

config/locales/en.yml

@@ -12,8 +12,10 @@ en:
   commits_by_hour: Commits by hour
   files: Files
   lines: Lines
+  comments: Comments
   files_by_date: Files by date
   lines_by_date: Lines by date
+  comments_by_date: Comments by date
   files_by_extension: Files by extension
   lines_by_extension: Lines by extension
   hour_of_day: Hour of day

lib/git_stats/base.rb

@@ -18,6 +18,7 @@ require 'git_stats/git_data/command_runner'
 require 'git_stats/git_data/commit'
 require 'git_stats/git_data/repo'
 require 'git_stats/git_data/short_stat'
+require 'git_stats/git_data/comment_stat'
 
 require 'git_stats/stats_view/template'
 require 'git_stats/stats_view/view'

lib/git_stats/git_data/comment_stat.rb

@@ -0,0 +1,32 @@
+# -*- encoding : utf-8 -*-
+module GitStats
+  module GitData
+    class CommentStat
+      attr_reader :commit, :insertions, :deletions
+
+      def initialize(commit)
+        @commit = commit
+        calculate_stat
+      end
+
+      def changed_lines
+        insertions + deletions
+      end
+
+      def to_s
+        "#{self.class} #@commit"
+      end
+
+      private
+      def calculate_stat
+        stat_line = commit.repo.run("git show #{commit.sha} | awk 'BEGIN {adds=0; dels=0} {if ($0 ~ /^\\+\\/\\/\\//) adds++; if ($0 ~ /^\-\\/\\/\\//) dels++} END {print adds \" insertions \" dels \" deletes\"}'").lines.to_a[0]
+        if stat_line.blank?
+          @insertions = @deletions = 0
+        else
+          @insertions = stat_line[/(\d+) insertions?/, 1].to_i
+          @deletions = stat_line[/(\d+) deletes?/, 1].to_i
+        end
+      end
+    end
+  end
+end

lib/git_stats/git_data/commit.rb

@@ -50,6 +50,10 @@ module GitStats
         @short_stat ||= ShortStat.new(self)
       end
 
+      def comment_stat
+        @comment_stat ||= CommentStat.new(self)
+      end
+
       def to_s
         "#{self.class} #@sha"
       end

lib/git_stats/git_data/repo.rb

@@ -9,7 +9,7 @@ module GitStats
       attr_reader :path, :first_commit_sha, :last_commit_sha
 
       delegate :files, :files_by_extension, :files_by_extension_count, :lines_by_extension,
-               :files_count, :binary_files, :text_files, :lines_count, to: :last_commit
+               :files_count, :binary_files, :text_files, :lines_count, :comments_count, to: :last_commit
 
       def initialize(params)
         super(params)
@@ -63,6 +63,15 @@ module GitStats
         }].fill_empty_days!(aggregated: true)
       end
 
+      def comments_count_by_date
+        sum = 0
+        @comment_count_each_day ||= Hash[commits.map { |commit|
+          sum += commit.comment_stat.insertions
+          sum -= commit.comment_stat.deletions
+          [commit.date.to_date, sum]
+        }].fill_empty_days!(aggregated: true)
+      end
+
       def last_commit
         commits.last
       end
@@ -79,6 +88,10 @@ module GitStats
         @short_stats ||= commits.map(&:short_stat)
       end
 
+      def comment_stats
+        @comment_stats ||= commits.map(&:comment_stat)
+      end
+
       def activity
         @activity ||= Activity.new(commits)
       end

lib/git_stats/stats_view/charts/charts.rb

@@ -3,7 +3,7 @@ module GitStats
   module StatsView
     module Charts
       class All
-        delegate :files_by_extension, :lines_by_extension, :files_by_date, :lines_by_date, to: :repo_charts
+        delegate :files_by_extension, :lines_by_extension, :files_by_date, :lines_by_date, :comments_by_date, to: :repo_charts
 
         delegate :commits_sum_by_author_by_date, :changed_lines_by_author_by_date,
                  :insertions_by_author_by_date, :deletions_by_author_by_date, to: :authors_charts

lib/git_stats/stats_view/charts/repo_charts.rb

@@ -47,6 +47,16 @@ module GitStats
           end
         end
 
+        def comments_by_date
+          Chart.new do |f|
+            f.date_chart(
+                data: @repo.comments_count_by_date,
+                title: :comments_by_date.t,
+                y_text: :comments.t
+            )
+          end
+        end
+
       end
     end
   end

lib/git_stats/stats_view/view.rb

@@ -55,7 +55,8 @@ module GitStats
             activity: 'activity/by_date.html',
             authors: 'authors/best_authors.html',
             files: 'files/by_date.html',
-            lines: 'lines/by_date.html'
+            lines: 'lines/by_date.html',
+            comments: 'comments/by_date.html'
         }
       end
 

templates/comments/_comments.haml

@@ -0,0 +1,11 @@
+.tabbable.tabs-left
+  %ul.nav.nav-tabs
+    %li{class: page == :comments_by_date ? "active" : ""}
+      %a{:href => 'by_date.html'}= :comments_by_date.t
+
+  .tab-content
+    .tab-pane.active
+      .page-header
+        %h1.pagination-centered= page.t
+      - if page == :comments_by_date
+        = high_stock("comments_by_date", charts.comments_by_date)

templates/comments/by_date.haml

@@ -0,0 +1 @@
+= render_partial('comments/_comments', page: :comments_by_date)