From 354372705f190171f5b22f7fe976da19c240a7f4 Mon Sep 17 00:00:00 2001
From: Tom Preston-Werner <tom@mojombo.com>
Date: Mon, 19 Apr 2010 11:49:46 -0700
Subject: [PATCH] image alt

---
 lib/gollum/markup.rb | 23 ++++++++++++++++++++++-
 test/test_markup.rb  | 18 +++++++++++++++++-
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/lib/gollum/markup.rb b/lib/gollum/markup.rb
index 27ed110f..344993e5 100644
--- a/lib/gollum/markup.rb
+++ b/lib/gollum/markup.rb
@@ -78,10 +78,31 @@ module Gollum
       name = parts[0].strip
 
       if file = find_file(name)
-        %{<img src="/#{file.path}" />}
+        attrs = process_image_tag_attributes(tag)
+        %{<img src="/#{file.path}" #{attrs}/>}
       end
     end
 
+    # Process any attributes present on the image tag and format them as an
+    # image tag fragment.
+    #
+    # tag - The String tag contents (the stuff inside the double brackets).
+    #
+    # Returns the String image tag fragment.
+    def process_image_tag_attributes(tag)
+      attrs = tag.split('|')[1..-1].inject({}) do |memo, attr|
+        parts = attr.split('=').map { |x| x.strip }
+        memo[parts[0]] = (parts.size == 1 ? true : parts[1])
+        memo
+      end
+
+      fragments = []
+      if alt = attrs['alt']
+        fragments << %{alt="#{alt}"}
+      end
+      fragments.size > 0 ? fragments.join(' ') + ' ' : ''
+    end
+
     # Attempt to process the tag as a file link tag.
     #
     # tag - The String tag contents (the stuff inside the double brackets).
diff --git a/test/test_markup.rb b/test/test_markup.rb
index da07578c..62acdbb6 100644
--- a/test/test_markup.rb
+++ b/test/test_markup.rb
@@ -46,6 +46,12 @@ context "Markup" do
     assert_equal %{<p>a <img src="/greek/alpha.jpg" /> b</p>\n}, output
   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>\n}
+    relative_image(content, output)
+  end
+
   test "file link with absolute path" do
     index = @wiki.repo.index
     index.add("alpha.jpg", "hi")
@@ -68,4 +74,14 @@ context "Markup" do
     assert_equal %{<p>a <a href="/greek/alpha.jpg">Alpha</a> b</p>\n}, output
   end
 
-end
+  def relative_image(content, output)
+    index = @wiki.repo.index
+    index.add("greek/alpha.jpg", "hi")
+    index.add("greek/Bilbo-Baggins.md", content)
+    index.commit("Add alpha.jpg")
+
+    page = @wiki.page("Bilbo Baggins")
+    rendered = Gollum::Markup.new(page).render
+    assert_equal output, rendered
+  end
+end
\ No newline at end of file