Add files/lines by extension by date

config/locales/en.yml

@@ -61,3 +61,5 @@ en:
   insertions_by_date: Lines added by date
   deletions_by_date: Lines deleted by date
   changed_lines_by_date: Changed lines by date
+  lines_by_extension_by_date: Lines per extension by date
+  files_by_extension_by_date: Files per extension by date

lib/git_stats/git_data/repo.rb

@@ -39,6 +39,10 @@ module GitStats
         @tree ||= Tree.new(repo: self, relative_path: @tree_path)
       end
 
+      def command_memoization
+        @command_memoization_map ||= {}
+      end
+
       def authors
         @authors ||= run_and_parse("git shortlog -se #{commit_range} #{tree_path}").map do |author|
           Author.new(repo: self, name: author[:name], email: author[:email])
@@ -95,6 +99,44 @@ module GitStats
         }].fill_empty_days!(aggregated: true)
       end
 
+      def files_by_extension_by_date
+        file_counts_by_date_by_extension = {}
+        extensions_sums = {}
+        commits.map do |commit|
+          commit.files_by_extension_count.map do |ext, count|
+            extensions_sums[ext] ||= 0;
+            extensions_sums[ext] = count;
+            file_counts_by_date_by_extension[ext] ||= {};
+            file_counts_by_date_by_extension[ext][commit.date.to_date] = extensions_sums[ext]
+          end
+        end
+        @multi_data_file_counts_by_date ||=  file_counts_by_date_by_extension.map { |ext, data|
+          {
+            name: ext || "NO EXTENSION",
+            data: data.fill_empty_days!(aggregated:true)
+            }
+          }
+      end
+
+      def lines_by_extension_by_date
+        lines_by_date_by_extension = {}
+        extensions_sums = {}
+        commits.map do |commit|
+          commit.lines_by_extension.map do |ext, count|
+            extensions_sums[ext] ||= 0;
+            extensions_sums[ext] = count;
+            lines_by_date_by_extension[ext] ||= {};
+            lines_by_date_by_extension[ext][commit.date.to_date] = extensions_sums[ext]
+          end
+        end
+        @multi_data_lines_by_date ||=  lines_by_date_by_extension.map { |ext, data|
+          {
+            name: ext || "NO EXTENSION",
+            data: data.fill_empty_days!(aggregated:true)
+            }
+          }
+      end
+
       def last_commit
         commits.last
       end
@@ -124,9 +166,14 @@ module GitStats
       end
 
       def run(command)
-        result = command_runner.run(path, command)
+        if (command_memoization[command])
-        invoke_command_observers(command, result)
+          command_memoization[command]
-        result
+        else
+          result = command_runner.run(path, command)
+          invoke_command_observers(command, result)
+          command_memoization[command] = result
+          result
+        end
       end
 
       def run_and_parse(command)

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, :comments_by_date, to: :repo_charts
+        delegate :files_by_extension, :files_by_extension_by_date, :lines_by_extension, :lines_by_extension_by_date, :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

@@ -27,6 +27,26 @@ module GitStats
           end
         end
 
+        def files_by_extension_by_date
+          Chart.new do |f|
+            f.multi_date_chart(
+                data: @repo.files_by_extension_by_date,
+                title: :files_by_extension_by_date.t,
+                y_text: :files.t
+            )
+          end
+        end
+
+        def lines_by_extension_by_date
+          Chart.new do |f|
+            f.multi_date_chart(
+                data: @repo.lines_by_extension_by_date,
+                title: :lines_by_extension_by_date.t,
+                y_text: :files.t
+            )
+          end
+        end
+
         def files_by_date
           Chart.new do |f|
             f.date_chart(

templates/files/_files.haml

@@ -4,6 +4,8 @@
       %a{:href => 'by_date.html'}= :files_by_date.t
     %li{class: page == :files_by_extension ? "active" : ""}
       %a{:href => 'by_extension.html'}= :files_by_extension.t
+    %li{class: page == :files_by_extension_by_date ? "active" : ""}
+      %a{:href => 'by_extension_by_date.html'}= :files_by_extension_by_date.t
 
   .tab-content
     .tab-pane.active
@@ -13,3 +15,5 @@
         = high_stock("files_by_date", charts.files_by_date)
       - elsif page == :files_by_extension
         = high_chart("files_by_extension", charts.files_by_extension)
+      - elsif page == :files_by_extension_by_date
+        = high_stock("files_by_extension_by_date", charts.files_by_extension_by_date)

templates/files/by_extension_by_date.haml

@@ -0,0 +1 @@
+= render_partial('files/_files', page: :files_by_extension_by_date)

templates/lines/_lines.haml

@@ -4,6 +4,8 @@
       %a{:href => 'by_date.html'}= :lines_by_date.t
     %li{class: page == :lines_by_extension ? "active" : ""}
       %a{:href => 'by_extension.html'}= :lines_by_extension.t
+    %li{class: page == :lines_by_extension_by_date ? "active" : ""}
+      %a{:href => 'by_extension_by_date.html'}= :lines_by_extension_by_date.t
 
   .tab-content
     .tab-pane.active
@@ -13,3 +15,5 @@
         = high_stock("lines_by_date", charts.lines_by_date)
       - elsif page == :lines_by_extension
         = high_chart("lines_by_extension", charts.lines_by_extension)
+      - elsif page == :lines_by_extension_by_date
+        = high_stock("lines_by_extension_by_date", charts.lines_by_extension_by_date)

templates/lines/by_extension_by_date.haml

@@ -0,0 +1 @@
+= render_partial('lines/_lines', page: :lines_by_extension_by_date)