fix bug where relative images in previews did not render

lib/gollum/page.rb

@@ -333,9 +333,9 @@ module Gollum
     # path - The String directory path of the page file.
     #
     # Returns the populated Gollum::Page.
-    def populate(blob, path)
+    def populate(blob, path=nil)
       @blob = blob
-      @path = (path + '/' + blob.name)[1..-1]
+      @path = "#{path}/#{blob.name}"[1..-1]
       self
     end
 

lib/gollum/wiki.rb

@@ -168,10 +168,10 @@ module Gollum
     def preview_page(name, data, format)
       page = @page_class.new(self)
       ext  = @page_class.format_to_ext(format.to_sym)
-      path = @page_class.cname(name) + '.' + ext
-      blob = OpenStruct.new(:name => path, :data => data)
-      page.populate(blob, path)
-      page.version = @access.commit('HEAD')
+      name = @page_class.cname(name) + '.' + ext
+      blob = OpenStruct.new(:name => name, :data => data)
+      page.populate(blob)
+      page.version = @access.commit('master')
       page
     end
 

test/test_markup.rb

@@ -238,6 +238,27 @@ context "Markup" do
     assert_equal %{<p>a <img src="/wiki/greek/alpha.jpg" /><a href="/wiki/greek/alpha.jpg">a</a> b</p>}, output
   end
 
+  test "image with absolute path on a preview" do
+    @wiki = Gollum::Wiki.new(@path, :base_path => '/wiki')
+    index = @wiki.repo.index
+    index.add("alpha.jpg", "hi")
+    index.commit("Add alpha.jpg")
+
+    page = @wiki.preview_page("Test", "a [[/alpha.jpg]] b", :markdown)
+    assert_equal %{<p>a <img src="/wiki/alpha.jpg" /> b</p>}, page.formatted_data
+  end
+
+  test "image with relative path on a preview" do
+    @wiki = Gollum::Wiki.new(@path, :base_path => '/wiki')
+    index = @wiki.repo.index
+    index.add("alpha.jpg", "hi")
+    index.add("greek/alpha.jpg", "hi")
+    index.commit("Add alpha.jpg")
+
+    page = @wiki.preview_page("Test", "a [[alpha.jpg]] [[greek/alpha.jpg]] b", :markdown)
+    assert_equal %{<p>a <img src="/wiki/alpha.jpg" /><img src="/wiki/greek/alpha.jpg" /> b</p>}, page.formatted_data
+  end
+
   test "image with alt" do
     content = "a [[alpha.jpg|alt=Alpha Dog]] b"
     output = %{<p>a <img src="/greek/alpha.jpg" alt="Alpha Dog" /> b</p>}