Add quick access to diff of each commit in the history (#1555)

lib/gollum/app.rb

@@ -506,6 +506,24 @@ module Precious
         end
       end
 
+      get %r{
+        /commit/  # match any URL beginning with /show/
+        (\w+)     # match the SHA1
+      }x do |version|
+        @version = version
+        wiki = wiki_new
+        begin
+          @commit = wiki.repo.commit(version)
+          parent = @commit.parent
+          parent_id = parent.nil? ? nil : parent.id
+          @diff = wiki.repo.diff(parent_id, version)
+          mustache :commit
+        rescue Gollum::Git::NoSuchShaFound
+          @message = "Invalid commit: #{@version}"
+          mustache :error
+        end
+      end
+
       get '/search' do
         @query     = params[:q]
         @name      = @query

lib/gollum/templates/commit.mustache

@@ -0,0 +1,26 @@
+<div id="wiki-wrapper" class="compare">
+  <div id="head">
+    <h1 class="py-4">{{message}}</h1>
+    {{author}} commited {{authored_date}}
+    <span class="px-2 float-right">commit <code>{{version}}</code></span>
+  </div>
+
+  <div id="compare-content">
+	  {{#files}}
+    <div class="Box data highlight my-3">
+      <div class="Box-header Box--condensed Box-header--gray">
+				<code>{{path}}</code>
+			</div>
+      <table>
+        {{#lines}}
+        <tr>
+          <td class="line_numbers">{{ldln}}</td>
+          <td class="line_numbers">{{rdln}}</td>
+          <td><div class="{{class}} pl-2">{{line}}</div></td>
+        </tr>
+        {{/lines}}
+      </table>
+    </div>
+    {{/files}}
+  </div>
+</div>

lib/gollum/templates/history.mustache

@@ -18,7 +18,10 @@
 					<span class="float-left col-2" id="user-icons">{{>author_template}}</span>
 					<span class="flex-auto col-1 text-gray-light">{{date}}</span>
 					<span class="flex-auto col-5">{{message}}</span>
-					<span class="pl-4 float-right">[<a href="{{base_url}}/{{filename}}/{{id}}" title="View commit">{{id7}}</a>]</span>
+					<span class="pl-4 float-right">
+						<a href="{{href}}" class="btn btn-outline text-mono">{{id7}}</a>
+						<a href="{{href_page}}" title="Browse the page at this point in the history" class="btn btn-outline">{{#octicon}}code{{/octicon}}</a>
+					</span>
 				</li>
 				{{/versions}}
 			</ul>

lib/gollum/templates/latest_changes.mustache

@@ -8,9 +8,9 @@
 
 <div id="wiki-history">
 
-<div class="Box flex-auto">
+<ul class="Box flex-auto">
 	{{#versions}}
-		<div class="Box-row Box-row--hover-gray border-top d-flex flex-items-center">
+		<li class="Box-row Box-row--hover-gray border-top d-flex flex-items-center">
 			<span class="float-left col-2" id="user-icons">{{>author_template}}</span>
 			<span class="flex-auto col-1 text-gray-light">{{date}}</span>
 			<span class="flex-auto col-7">{{message}}<br/>
@@ -18,10 +18,12 @@
 			  <span class="flex-auto col-2">{{#renamed}}{{renamed}} -> {{/renamed}}<a href="{{link}}">{{file}}</a></span><br/>
 			{{/files}}
 			</span>
-			<span class="pl-4 float-right">[{{id7}}]</span>
+			<span class="pl-4 float-right">
-		</div>
+				<a href="{{href}}" class="btn btn-outline text-mono">{{id7}}</a>
+			</span>
+		</li>
 	{{/versions}}
-</div>
+</ul>
 
  
 </div>

lib/gollum/views/commit.rb

@@ -0,0 +1,38 @@
+require_relative 'compare.rb'
+
+module Precious
+  module Views
+    class Commit < Compare
+
+      attr_reader :version
+
+      def title
+        "Changes in #{@version[0..6]}: #{message}"
+      end
+
+      def author
+        @commit.author.name
+      end
+
+      def authored_date
+        @commit.authored_date
+      end
+
+      def message
+        @commit.message
+      end
+
+      def files
+        files = @diff.split(%r{^diff --git a/.+ b/.+$}).reject(&:empty?)
+        files.map do |diff|
+          matched = diff.match(%r{(?<=^--- a/).+$})
+          matched = diff.match(%r{(?<=^\+\+\+ b/).+$}) if matched.nil?
+          {
+            path: matched[0],
+            lines: lines(diff)
+          }
+        end
+      end
+    end
+  end
+end

lib/gollum/views/compare.rb

@@ -17,9 +17,9 @@ module Precious
         @versions[1][0..6]
       end
 
-      def lines
+      def lines(diff = @diff)
         lines = []
-        lines_to_parse = @diff.split("\n")[4..-1]
+        lines_to_parse = diff.split("\n")[4..-1]
         # If the diff is of a rename, the diff header will be one line longer than normal because it will contain a line starting with '+++' to indicate the 'new' filename.
         # Make sure to skip that header line if it is present.
         lines_to_parse = lines_to_parse[1..-1] if lines_to_parse[0].start_with?('+++')
@@ -28,7 +28,7 @@ module Precious
                      :class => line_class(line),
                      :ldln  => left_diff_line_number(line),
                      :rdln  => right_diff_line_number(line) }
-        end if @diff
+        end if diff
         lines
       end
 

lib/gollum/views/history.rb

@@ -17,15 +17,18 @@ module Precious
         i = @versions.size + 1
         @versions.map do |v|
           i -= 1
+          filename = path_for_version(v.tracked_pathname)
           { :id        => v.id,
             :id7       => v.id[0..6],
+            :href      => page_route("gollum/commit/#{v.id}"),
+            :href_page => page_route("#{filename}/#{v.id}"),
             :num       => i,
             :selected  => @page.version.id == v.id,
             :author    => v.author.name.respond_to?(:force_encoding) ? v.author.name.force_encoding('UTF-8') : v.author.name,
             :message   => v.message.respond_to?(:force_encoding) ? v.message.force_encoding('UTF-8') : v.message,
             :date      => v.authored_date.strftime("%B %d, %Y"),
             :user_icon => self.user_icon_code(v.author.email),
-            :filename  => path_for_version(v.tracked_pathname),
+            :filename  => filename,
             :date_full => v.authored_date,
           }
         end

lib/gollum/views/latest_changes.rb

@@ -16,6 +16,7 @@ module Precious
           i -= 1
           { :id        => v.id,
             :id7       => v.id[0..6],
+            :href      => page_route("gollum/commit/#{v.id}"),
             :num       => i,
             :author    => v.author.name.respond_to?(:force_encoding) ? v.author.name.force_encoding('UTF-8') : v.author.name,
             :message   => v.message.respond_to?(:force_encoding) ? v.message.force_encoding('UTF-8') : v.message,