Refactor Parallel Diff feature and add scrollbars

Also now removed lines relating to unused comments feature

1 files changed, 74 insertions, 2 deletions

diff --git a/app/helpers/commits_helper.rb b/app/helpers/commits_helper.rb
index 5e5f3f77a21..c6e4f574b67 100644
--- a/app/helpers/commits_helper.rb
+++ b/app/helpers/commits_helper.rb
@@ -105,8 +105,80 @@ 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
+  def parallel_diff_lines(project, commit, diff, file)
+    old_file = project.repository.blob_at(commit.parent_id, diff.old_path) if commit.parent_id
+    deleted_lines = {}
+    added_lines = {}
+    each_diff_line(diff, 0) do |line, type, line_code, line_new, line_old|
+      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 }
+      end
+    end
+    max_length = old_file ? old_file.sloc + added_lines.length : file.sloc
+
+    offset1 = 0
+    offset2 = 0
+    old_lines = []
+    new_lines = []
+
+    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
+      end
+
+      old_lines[line_index] = DiffLine.new
+      new_lines[line_index] = DiffLine.new
+
+      # old
+      if line_index == 0 && diff.new_file
+        old_lines[line_index].type = :file_created
+        old_lines[line_index].content = 'File was created'
+      elsif deleted_line
+        old_lines[line_index].type = :deleted
+        old_lines[line_index].content = old_line
+        old_lines[line_index].num = line_index1 + 1
+        old_lines[line_index].code = deleted_line[:line_code]
+      elsif old_line
+        old_lines[line_index].type = :no_change
+        old_lines[line_index].content = old_line
+        old_lines[line_index].num = line_index1 + 1
+      else
+        old_lines[line_index].type = :added
+      end
+
+      # new
+      if line_index == 0 && diff.deleted_file
+        new_lines[line_index].type = :file_deleted
+        new_lines[line_index].content = "File was deleted"
+      elsif added_line
+        new_lines[line_index].type = :added
+        new_lines[line_index].num = line_index2 + 1
+        new_lines[line_index].content = new_line
+        new_lines[line_index].code = added_line[:line_code]
+      elsif new_line
+        new_lines[line_index].type = :no_change
+        new_lines[line_index].num = line_index2 + 1
+        new_lines[line_index].content = new_line
+      else
+        new_lines[line_index].type = :deleted
+      end
+    end
+
+    return old_lines, new_lines
   end
 
   protected