diff view on commit with parallel diff view

app/assets/stylesheets/sections/commits.scss

@@ -70,7 +70,7 @@
         font-size: 12px;
       }
     }
-    .old_line, .new_line {
+    .old_line, .new_line, .diff_line {
       margin: 0px;
       padding: 0px;
       border: none;
@@ -92,6 +92,15 @@
           text-decoration: underline;
         }
       }
+      &.new {
+        background: #CFD;
+      }
+      &.old {
+        background: #FDD;
+      }
+    }
+    .diff_line {
+      padding: 0;
     }
     .line_holder {
       &.old .old_line,
@@ -122,6 +131,11 @@
         color: #ccc;
         background: #fafafa;
       }
+      &.parallel {
+        display: table-cell;
+        overflow: hidden;
+        width: 50%;
+      }
     }
   }
   .image {

app/assets/stylesheets/sections/notes.scss

@@ -131,6 +131,11 @@ ul.notes {
       text-align: center;
       padding: 10px 0;
     }
+    &.notes_line2 {
+      text-align: center;
+      padding: 10px 0;
+      border-left: 1px solid #ddd !important;
+    }
     &.notes_content {
       background-color: $white;
       border-width: 1px 0;
@@ -358,3 +363,7 @@ ul.notes {
 .js-note-attachment-delete {
   display: none;
 }
+
+.parallel-comment {
+  padding: 6px;
+}
\ No newline at end of file

app/helpers/commits_helper.rb

@@ -105,6 +105,10 @@ module CommitsHelper
     branches.sort.map { |branch| link_to(branch, project_tree_path(project, branch)) }.join(", ").html_safe
   end
 
+  def get_old_file(project, commit, diff)
+    project.repository.blob_at(commit.parent_id, diff.old_path) if commit.parent_id
+  end
+
   protected
 
   # Private: Returns a link to a person. If the person has a matching user and

app/views/projects/commits/_diffs.html.haml

@@ -30,6 +30,10 @@
       %strong.cgreen #{@commit.stats.additions} additions
       and
       %strong.cred #{@commit.stats.deletions} deletions
+  - if params[:view] == 'parallel'
+    = link_to "Unified Diff", url_for(view: 'unified'), {id: "commit-diff-viewtype", class: 'btn btn-tiny pull-right'}
+  - else
+    = link_to "Parallel Diff", url_for(view: 'parallel'), {id: "commit-diff-viewtype", class: 'btn btn-tiny pull-right'}
 .file-stats
   = render "projects/commits/diff_head", diffs: diffs
 
@@ -62,7 +66,10 @@
           -# Skipp all non non-supported blobs
           - next unless file.respond_to?('text?')
           - if file.text?
-            = render "projects/commits/text_file", diff: diff, index: i
+            - if params[:view] == 'parallel'
+              = render "projects/commits/parallel_view", diff: diff, project: project, file: file, index: i            
+            - else
+              = render "projects/commits/text_file", diff: diff, index: i
           - elsif file.image?
             - old_file = project.repository.blob_at(@commit.parent_id, diff.old_path) if @commit.parent_id
             = render "projects/commits/image", diff: diff, old_file: old_file, file: file, index: i

app/views/projects/commits/_parallel_view.html.haml

+/ Parallel diff view
+- old_file = get_old_file(project, @commit, diff)
+- deleted_lines = {}
+- added_lines = {}
+- each_diff_line(diff, index) do |line, type, line_code, line_new, line_old, raw_line|
+  - if type == "old"
+    - deleted_lines[line_old] = { line_code: line_code, type: type, line: line }
+  - elsif type == "new"
+    - added_lines[line_new]   = { line_code: line_code, type: type, line: line }
+
+- max_length = old_file.sloc + added_lines.length if old_file
+- max_length ||= file.sloc
+- offset1 = 0
+- offset2 = 0
+
+%div.text-file-parallel
+  %table{ style: "table-layout: fixed;" }
+    - max_length.times do |line_index|
+      - line_index1 = line_index - offset1
+      - line_index2 = line_index - offset2
+      - deleted_line = deleted_lines[line_index1 + 1]
+      - added_line = added_lines[line_index2 + 1]
+      - old_line = old_file.lines[line_index1] if old_file
+      - new_line = file.lines[line_index2]
+
+      - if deleted_line && added_line
+      - elsif deleted_line
+        - new_line = nil
+        - offset2 += 1
+      - elsif added_line
+        - old_line = nil
+        - offset1 += 1
+
+      %tr.line_holder.parallel
+        - if line_index == 0 && diff.new_file
+          %td.line_content.parallel= "File was created"
+          %td.old_line= ""
+        - elsif deleted_line
+          %td.line_content{class: "parallel noteable_line old #{deleted_line[:line_code]}", "line_code" => deleted_line[:line_code] }= old_line
+          %td.old_line.old
+            = line_index1 + 1
+            - if @comments_allowed
+              =# render "projects/notes/diff_note_link", line_code: deleted_line[:line_code]
+        - elsif old_line
+          %td.line_content.parallel= old_line
+          %td.old_line= line_index1 + 1
+        - else
+          %td.line_content.parallel= ""
+          %td.old_line= ""
+
+        %td.diff_line= ""
+
+        - if diff.deleted_file && line_index == 0
+          %td.new_line= ""
+          %td.line_content.parallel= "File was deleted"
+        - elsif added_line
+          %td.new_line.new
+            = line_index2 + 1
+            - if @comments_allowed
+              =# render "projects/notes/diff_note_link", line_code: added_line[:line_code]
+          %td.line_content{class: "parallel noteable_line new #{added_line[:line_code]}", "line_code" => added_line[:line_code] }= new_line
+        - elsif new_line
+          %td.new_line= line_index2 + 1
+          %td.line_content.parallel= new_line
+        - else
+          %td.new_line= ""
+          %td.line_content.parallel= ""
+
+      - if @reply_allowed
+        - comments1 = []
+        - comments2 = []
+        - comments1 = @line_notes.select { |n| n.line_code == deleted_line[:line_code] }.sort_by(&:created_at) if deleted_line
+        - comments2 = @line_notes.select { |n| n.line_code == added_line[:line_code] }.sort_by(&:created_at) if added_line
+        - unless comments1.empty? && comments2.empty?
+          = render "projects/notes/diff_notes_with_reply_parallel", notes1: comments1, notes2: comments2, line1: deleted_line, line2: added_line
\ No newline at end of file

app/views/projects/commits/_text_file.html.haml

@@ -21,3 +21,4 @@
       - comments = @line_notes.select { |n| n.line_code == line_code }.sort_by(&:created_at)
       - unless comments.empty?
         = render "projects/notes/diff_notes_with_reply", notes: comments, line: line
+

app/views/projects/notes/_diff_notes_with_reply_parallel.html.haml

+- note1 = notes1.first # example note
+- note2 = notes2.first # example note
+%tr.notes_holder
+  -# Check if line want not changed since comment was left
+  /- if !defined?(line1) || line1 == note1.diff_line
+  - if note1
+    %td.notes_content
+      %ul.notes{ rel: note1.discussion_id }
+        = render notes1
+      = render "projects/notes/discussion_reply_button", note: note1
+    %td.notes_line2
+      %span.btn.disabled.parallel-comment
+        %i.icon-comment
+        = notes1.count
+  - else
+    %td= ""
+    %td= ""
+
+  %td= ""
+
+  -# Check if line want not changed since comment was left
+  /- if !defined?(line2) || line2 == note2.diff_line
+  - if note2
+    %td.notes_line
+      %span.btn.disabled.parallel-comment
+        %i.icon-comment
+        = notes2.count
+    %td.notes_content
+      %ul.notes{ rel: note2.discussion_id }
+        = render notes2
+      = render "projects/notes/discussion_reply_button", note: note2
+  - else
+    %td= ""
+    %td= ""

features/project/commits/commits.feature

@@ -14,6 +14,12 @@ Feature: Project Browse commits
   Scenario: I browse commit from list
     Given I click on commit link
     Then I see commit info
+    And I see parallel diff button
+
+  Scenario: I browse commit with parallel diff view
+    Given I click on commit link
+    And I click parallel diff button
+    Then I see unified diff button
 
   Scenario: I compare refs
     Given I visit compare refs page

features/steps/project/project_browse_commits.rb

@@ -88,4 +88,17 @@ class ProjectBrowseCommits < Spinach::FeatureSteps
     links[0]['href'].should =~ %r{blob/bc3735004cb45cec5e0e4fa92710897a910a5957}
     links[1]['href'].should =~ %r{blob/cc1ba255d6c5ffdce87a357ba7ccc397a4f4026b}
   end
+
+  Given 'I click parallel diff button' do
+    click_link "Parallel Diff"
+  end
+
+  Then 'I see parallel diff button' do
+    page.should have_content "Parallel Diff"
+  end
+
+  Then 'I see unified diff button' do
+    page.should have_content "Unified Diff"
+  end
+
 end