Handling big commits & big diff

app/assets/javascripts/application.js

@@ -74,3 +74,8 @@ function resetMenu() {
 function slugify(text) {
   return text.replace(/[^-a-zA-Z0-9]+/g, '_').toLowerCase();
 }
+
+function showDiff(link) { 
+  $(link).next('table').show();
+  $(link).remove();
+}

app/assets/stylesheets/common.scss

@@ -17,9 +17,15 @@ a {
   &.lined { 
     text-decoration:underlined; 
   }
+  &.supp_diff_link { 
+    text-align:center;
+    padding:20px 0;
+    background:#f1f1f1;
+    width:100%;
+    float:left;
+  }
 }
 
-
 .btn { 
   background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#f1f1f1), color-stop(25%, #f1f1f1), to(#e6e6e6));
   background-image: -webkit-linear-gradient(#f1f1f1, #f1f1f1 25%, #e6e6e6);

app/controllers/commits_controller.rb

@@ -34,6 +34,10 @@ class CommitsController < ApplicationController
     @line_notes = project.commit_line_notes(@commit)
 
     @notes_count = @line_notes.count + project.commit_notes(@commit).count
+
+    if @commit.diffs.size > 200 && !params[:force_show_diff]
+      @suppress_diff = true 
+    end
   end
 
   def compare

app/views/commits/_diffs.html.haml

@@ -1,26 +1,40 @@
+- if @suppress_diff
+  .alert-message.block-message
+    %p 
+      %strong Warning! Large commit with more then 200 files changed. 
+    %p To prevent performance issue we rejected diff information.
+    %p 
+      But if you still want to see diff 
+      = link_to "click this link", project_commit_path(@project, @commit.id, :force_show_diff => true), :class => "dark" 
+
+
+%p.cgray
+  Showing #{pluralize(diffs.count, "changed file")}
 .file_stats
   = render "commits/diff_head", :diffs => diffs
- 
-- diffs.each_with_index do |diff, i|
-  - next if diff.diff.empty?
-  - file = (@commit.tree / diff.b_path)
-  - file = (@commit.prev_commit.tree / diff.a_path) unless file
-  - next unless file
-  .diff_file
-    .diff_file_header
-      - if diff.deleted_file
-        %strong{:id => "#{diff.a_path}"}= diff.a_path
-      - else
-        = link_to tree_file_project_ref_path(@project, @commit.id, diff.b_path) do
-          %strong{:id => "#{diff.b_path}"}= diff.b_path
-      %br/
-    .diff_file_content
-      - if file.text?
-        = render "commits/text_file", :diff => diff, :index => i
-      - elsif file.image?
-        .diff_file_content_image
-          %img{:src => "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
-      - else
-        %p
-          %center No preview for this file type
+
+
+- unless @suppress_diff
+  - diffs.each_with_index do |diff, i|
+    - next if diff.diff.empty?
+    - file = (@commit.tree / diff.b_path)
+    - file = (@commit.prev_commit.tree / diff.a_path) unless file
+    - next unless file
+    .diff_file
+      .diff_file_header
+        - if diff.deleted_file
+          %strong{:id => "#{diff.a_path}"}= diff.a_path
+        - else
+          = link_to tree_file_project_ref_path(@project, @commit.id, diff.b_path) do
+            %strong{:id => "#{diff.b_path}"}= diff.b_path
+        %br/
+      .diff_file_content
+        - if file.text?
+          = render "commits/text_file", :diff => diff, :index => i
+        - elsif file.image?
+          .diff_file_content_image
+            %img{:src => "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
+        - else
+          %p
+            %center No preview for this file type
 

app/views/commits/_text_file.html.haml

@@ -1,4 +1,8 @@
-%table
+- too_big = max_lines = diff.diff.lines.count > 1000
+- if too_big
+  = link_to_function "Diff suppressed. Click to show", "showDiff(this)", :class => "supp_diff_link"
+
+%table{:class => "#{'hide' if too_big}"}
   - each_diff_line(diff.diff.lines.to_a, index) do |line, type, line_code, line_new, line_old|
     %tr.line_holder
       - if type == "match"

app/views/commits/show.html.haml

@@ -21,8 +21,6 @@
     %pre.commit_message
       = commit_msg_with_link_to_issues(@project, @commit.safe_message)
 %br
-%p.cgray
-  Showing #{pluralize(@commit.diffs.count, "changed file")}
 = render "commits/diffs", :diffs => @commit.diffs
 = render "notes/notes", :tid => @commit.id, :tt => "commit"
 = render "notes/per_line_form"