fix bug where relative images in previews did not render

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>}