Use short_id instead of [0..N] for short version of commit sha

app/helpers/commits_helper.rb

@@ -120,4 +120,8 @@ module CommitsHelper
                                        class: 'commit-short-id')
     end
   end
+
+  def truncate_sha(sha)
+    Commit.truncate_sha(sha)
+  end
 end

app/models/commit.rb

@@ -26,6 +26,10 @@ class Commit
     def diff_line_count(diffs)
       diffs.reduce(0) { |sum, d| sum + d.diff.lines.count }
     end
+
+    def truncate_sha(sha)
+      sha[0..10]
+    end
   end
 
   attr_accessor :raw
@@ -111,7 +115,7 @@ class Commit
 
   # Mentionable override.
   def gfm_reference
-    "commit #{sha[0..5]}"
+    "commit #{short_id}"
   end
 
   def method_missing(m, *args, &block)

app/models/event.rb

@@ -266,7 +266,7 @@ class Event < ActiveRecord::Base
   end
 
   def note_short_commit_id
-    note_commit_id[0..8]
+    Commit.truncate_sha(note_commit_id)
   end
 
   def note_commit?

app/models/merge_request_diff.rb

@@ -55,7 +55,7 @@ class MergeRequestDiff < ActiveRecord::Base
   end
 
   def last_commit_short_sha
-    @last_commit_short_sha ||= last_commit.sha[0..10]
+    @last_commit_short_sha ||= last_commit.short_id
   end
 
   private

app/views/events/_commit.html.haml

 %li.commit
   .commit-row-title
-    = link_to commit[:id][0..8], project_commit_path(project, commit[:id]), class: "commit_short_id", alt: ''
+    = link_to truncate_sha(commit[:id]), project_commit_path(project, commit[:id]), class: "commit_short_id", alt: ''
      
     = gfm event_commit_title(commit[:message]), project

app/views/events/_event_push.atom.haml

@@ -2,7 +2,7 @@
   - event.commits.first(15).each do |commit|
     %p
       %strong= commit[:author][:name]
-      = link_to "(##{commit[:id][0...8]})", project_commit_path(event.project, id: commit[:id])
+      = link_to "(##{truncate_sha(commit[:id])})", project_commit_path(event.project, id: commit[:id])
       %i
         at
         = commit[:timestamp].to_time.to_s(:short)

app/views/events/event/_push.html.haml

@@ -22,4 +22,4 @@
           - if event.commits_count > 2
             %span ... and #{event.commits_count - 2} more commits.
           = link_to project_compare_path(event.project, from: event.commit_from, to: event.commit_to) do
-            %strong Compare → #{event.commit_from[0..7]}...#{event.commit_to[0..7]}
+            %strong Compare → #{truncate_sha(event.commit_from)}...#{truncate_sha(event.commit_to)}

app/views/projects/commit/_commit_box.html.haml

@@ -35,7 +35,7 @@
 .commit-info-row
   %span.cgray= pluralize(@commit.parents.count, "parent")
   - @commit.parents.each do |parent|
-    = link_to parent.id[0...10], project_commit_path(@project, parent)
+    = link_to parent.short_id, project_commit_path(@project, parent)
 
 - if @branches.any?
   .commit-info-row

app/views/projects/tree/_submodule_item.html.haml

@@ -7,8 +7,8 @@
     @
     %span.monospace
       - if commit.nil?
-        #{submodule_item.id[0..10]}
+        #{truncate_sha(submodule_item.id)}
       - else
-        = link_to "#{submodule_item.id[0..10]}", commit
+        = link_to "#{truncate_sha(submodule_item.id)}", commit
   %td
   %td.hidden-xs

app/views/projects/wikis/history.html.haml

@@ -17,7 +17,7 @@
       %tr
         %td
           = link_to project_wiki_path(@project, @page, version_id: commit.id) do
-            = commit.id[0..10]
+            = truncate_sha(commit.id)
         %td
           = commit.author.name
         %td

app/views/search/results/_note.html.haml

@@ -10,7 +10,7 @@
         = project.name_with_namespace
       ·
       = link_to project_commit_path(project, note.commit_id, anchor: dom_id(note)) do
-        Commit #{note.commit_id[0..8]}
+        Commit #{truncate_sha(note.commit_id)}
     - else
       = link_to project do
         = project.name_with_namespace

features/steps/project/commits/commits.rb

@@ -8,7 +8,7 @@ class Spinach::Features::ProjectCommits < Spinach::FeatureSteps
     commit = @project.repository.commit
     page.should have_content(@project.name)
     page.should have_content(commit.message[0..20])
-    page.should have_content(commit.id.to_s[0..5])
+    page.should have_content(commit.short_id)
   end
 
   step 'I click atom feed link' do

spec/models/commit_spec.rb

@@ -75,7 +75,7 @@ eos
   it_behaves_like 'a mentionable' do
     let(:subject) { commit }
     let(:mauthor) { create :user, email: commit.author_email }
-    let(:backref_text) { "commit #{subject.sha[0..5]}" }
+    let(:backref_text) { "commit #{subject.short_id}" }
     let(:set_mentionable_text) { ->(txt){ subject.stub(safe_message: txt) } }
 
     # Include the subject in the repository stub.

spec/models/note_spec.rb

@@ -228,7 +228,7 @@ describe Note do
 
       it { should be_valid }
       its(:noteable) { should == issue }
-      its(:note) { should == "_mentioned in commit #{commit.sha[0..5]}_" }
+      its(:note) { should == "_mentioned in commit #{commit.sha[0..10]}_" }
     end
 
     context 'merge request from an issue' do
@@ -267,7 +267,7 @@ describe Note do
       its(:noteable_type) { should == "Commit" }
       its(:noteable_id) { should be_nil }
       its(:commit_id) { should == commit.id }
-      its(:note) { should == "_mentioned in commit #{parent_commit.id[0...6]}_" }
+      its(:note) { should == "_mentioned in commit #{parent_commit.id[0..10]}_" }
     end
   end
 

spec/support/mentionable_shared_examples.rb

@@ -30,15 +30,15 @@ def common_mentionable_setup
     "!#{mentioned_mr.iid}, " +
     "#{ext_proj.path_with_namespace}##{ext_issue.iid}, " +
     "#{ext_proj.path_with_namespace}!#{ext_mr.iid}, " +
-    "#{ext_proj.path_with_namespace}@#{ext_commit.id[0..5]}, " +
-    "#{mentioned_commit.sha[0..5]} and itself as #{backref_text}"
+    "#{ext_proj.path_with_namespace}@#{ext_commit.short_id}, " +
+    "#{mentioned_commit.sha[0..10]} and itself as #{backref_text}"
   end
 
   before do
     # Wire the project's repository to return the mentioned commit, and +nil+ for any
     # unrecognized commits.
-    commitmap = { '123456' => mentioned_commit }
-    extra_commits.each { |c| commitmap[c.sha[0..5]] = c }
+    commitmap = { '1234567890a' => mentioned_commit }
+    extra_commits.each { |c| commitmap[c.short_id] = c }
     mproject.repository.stub(:commit) { |sha| commitmap[sha] }
     set_mentionable_text.call(ref_string)
   end
@@ -54,7 +54,6 @@ shared_examples 'a mentionable' do
   it "extracts references from its reference property" do
     # De-duplicate and omit itself
     refs = subject.references(mproject)
-
     refs.should have(6).items
     refs.should include(mentioned_issue)
     refs.should include(mentioned_mr)
@@ -90,7 +89,7 @@ shared_examples 'an editable mentionable' do
 
   it 'creates new cross-reference notes when the mentionable text is edited' do
     new_text = "still mentions ##{mentioned_issue.iid}, " +
-      "#{mentioned_commit.sha[0..5]}, " +
+      "#{mentioned_commit.sha[0..10]}, " +
       "#{ext_issue.iid}, " +
       "new refs: ##{other_issue.iid}, " +
       "#{ext_proj.path_with_namespace}##{other_ext_issue.iid}"