add pagination for getting log entries from wikis

lib/gollum.rb

@@ -3,6 +3,7 @@ require 'grit'
 require 'github/markup'
 
 # internal
+require 'gollum/pagination'
 require 'gollum/wiki'
 require 'gollum/page'
 require 'gollum/file'

lib/gollum/page.rb

@@ -1,5 +1,7 @@
 module Gollum
   class Page
+    include Pagination
+
     VALID_PAGE_RE = /^(.+)\.(md|mkdn?|mdown|markdown|textile|rdoc|org|re?st(\.txt)?|asciidoc|pod|\d)$/i
 
     # Public: Initialize a page.
@@ -73,9 +75,13 @@ module Gollum
 
     # Public: All of the versions that have touched the Page.
     #
+    # options - The options Hash:
+    #           :page     - The Integer page number (default: 1).
+    #           :per_page - The Integer max count of items to return.
+    #
     # Returns an Array of Grit::Commit.
-    def versions
+    def versions(options = {})
-      @wiki.repo.log('master', @path)
+      @wiki.repo.log('master', @path, log_pagination_options(options))
     end
 
     #########################################################################

lib/gollum/pagination.rb

@@ -0,0 +1,32 @@
+module Gollum
+  module Pagination
+    def self.included(klass)
+      klass.extend ClassMethods
+      class << klass
+        attr_accessor :per_page
+      end
+      klass.per_page = 30
+    end
+
+    module ClassMethods
+      def page_to_skip(page)
+        ([1, page.to_i].max - 1) * per_page
+      end
+
+      def log_pagination_options(options = {})
+        skip = page_to_skip(options.delete(:page))
+        options[:max_count] = [options.delete(:per_page).to_i, per_page].max
+        options[:skip]      = skip if skip > 0
+        options
+      end
+    end
+
+    def page_to_skip(page)
+      self.class.page_to_skip(page)
+    end
+
+    def log_pagination_options(options = {})
+      self.class.log_pagination_options(options)
+    end
+  end
+end

lib/gollum/wiki.rb

@@ -1,5 +1,7 @@
 module Gollum
   class Wiki
+    include Pagination
+
     # Public: Initialize a new Gollum Repo.
     #
     # repo - The String path to the Git repository that holds the Gollum site.
@@ -121,6 +123,17 @@ module Gollum
       tree_list(@repo.commit(treeish).tree)
     end
 
+    # Public: All of the versions that have touched the Page.
+    #
+    # options - The options Hash:
+    #           :page     - The Integer page number (default: 1).
+    #           :per_page - The Integer max count of items to return.
+    #
+    # Returns an Array of Grit::Commit.
+    def log(options = {})
+      @repo.log('master', nil, log_pagination_options(options))
+    end
+
     #########################################################################
     #
     # Internal Methods

test/test_wiki.rb

@@ -13,6 +13,31 @@ context "Wiki" do
     assert_equal Grit::Repo, @wiki.repo.class
     assert @wiki.exist?
   end
+
+  test "shows paginated log with no page" do
+    Gollum::Wiki.per_page = 3
+    assert_equal %w(
+      f01428b3138994aab19d5f880b6f37336ddf1f24
+      fbabba862dfa7ac35b39042dd4ad780c9f67b8cb
+      df26e61e707116f81ebc6b935ec6d1676b7e96c4),
+      @wiki.log.map { |c| c.id }
+  end
+
+  test "shows paginated log with 1st page" do
+    Gollum::Wiki.per_page = 3
+    assert_equal %w(
+      f01428b3138994aab19d5f880b6f37336ddf1f24
+      fbabba862dfa7ac35b39042dd4ad780c9f67b8cb
+      df26e61e707116f81ebc6b935ec6d1676b7e96c4),
+      @wiki.log(:page => 1).map { |c| c.id }
+  end
+
+  test "shows paginated log with next page" do
+    Gollum::Wiki.per_page = 3
+    assert_equal %w(
+      5bc1aaec6149e854078f1d0f8b71933bbc6c2e43),
+      @wiki.log(:page => 2).map { |c| c.id }
+  end
 end
 
 context "Wiki page writing" do