Allow base path to be specified for wiki links.

README.md

@@ -231,6 +231,10 @@ Initialize the Gollum::Repo object:
     wiki = Gollum::Wiki.new("my-gollum-repo.git")
     # => <Gollum::Wiki>
 
+By default, internal wiki links are all absolute from the root. To specify a different base path, you can send specify the `:base_path` option:
+
+    wiki = Gollum::Wiki.new("my-gollum-repo.git", :base_path => "/wiki")
+
 Get the latest version of the given human or canonical page name:
 
     page = wiki.page('page-name')

lib/gollum/markup.rb

@@ -202,11 +202,9 @@ module Gollum
       parts = tag.split('|')
       name = parts[0].strip
       cname = Page.cname((parts[1] || parts[0]).strip)
-      if @wiki.page(cname)
-        %{<a class="internal present" href="#{cname}">#{name}</a>}
-      else
-        %{<a class="internal absent" href="#{cname}">#{name}</a>}
-      end
+      link = ::File.join(@wiki.base_path, cname)
+      presence = @wiki.page(cname) ? "present" : "absent"
+      %{<a class="internal #{presence}" href="#{link}">#{name}</a>}
     end
 
     # Find the given file in the repo.

lib/gollum/wiki.rb

@@ -6,6 +6,11 @@ module Gollum
       attr_accessor :page_class, :file_class
     end
 
+    # The String base path to prefix to internal links. For example, when set
+    # to "/wiki", the page "Hobbit" will be linked as "/wiki/Hobbit". Defaults
+    # to "/".
+    attr_reader :base_path
+
     # Public: Initialize a new Gollum Repo.
     #
     # repo    - The String path to the Git repository that holds the Gollum 
@@ -18,6 +23,7 @@ module Gollum
     def initialize(path, options = {})
       @path       = path
       @repo       = Grit::Repo.new(path)
+      @base_path  = options[:base_path] || "/"
       @page_class = options[:page_class] || self.class.page_class
       @file_class = options[:file_class] || self.class.file_class
     end

test/test_markup.rb

@@ -21,7 +21,7 @@ context "Markup" do
 
     page = @wiki.page("Bilbo Baggins")
     output = Gollum::Markup.new(page).render
-    assert_equal %{<p>a <a class="internal present" href="Bilbo-Baggins">Bilbo Baggins</a> b</p>}, output
+    assert_equal %{<p>a <a class="internal present" href="/Bilbo-Baggins">Bilbo Baggins</a> b</p>}, output
   end
 
   test "absent page link" do
@@ -29,7 +29,18 @@ context "Markup" do
 
     page = @wiki.page("Tolkien")
     output = Gollum::Markup.new(page).render
-    assert_equal %{<p>a <a class="internal absent" href="J.-R.-R.-Tolkien">J. R. R. Tolkien</a>'s b</p>}, output
+    assert_equal %{<p>a <a class="internal absent" href="/J.-R.-R.-Tolkien">J. R. R. Tolkien</a>'s b</p>}, output
+  end
+
+  test "page link with custom base path" do
+    ["/wiki", "/wiki/"].each do |path|
+      @wiki = Gollum::Wiki.new(@path, :base_path => path)
+      @wiki.write_page("Bilbo Baggins", :markdown, "a [[Bilbo Baggins]] b", @commit)
+
+      page = @wiki.page("Bilbo Baggins")
+      output = Gollum::Markup.new(page).render
+      assert_equal %{<p>a <a class="internal present" href="/wiki/Bilbo-Baggins">Bilbo Baggins</a> b</p>}, output
+    end
   end
 
   test "image with http url" do
@@ -190,7 +201,7 @@ context "Markup" do
 
   test "quoted wiki link" do
     content = "a '[[Foo]]', b"
-    output = "<p>a '<a class=\"internal absent\" href=\"Foo\">Foo</a>', b</p>"
+    output = "<p>a '<a class=\"internal absent\" href=\"/Foo\">Foo</a>', b</p>"
     compare(content, output)
   end