From adba18106081f55f2e8761b5104d295cacd6a8c6 Mon Sep 17 00:00:00 2001
From: Jeremy Kemper <jeremy@bitsweat.net>
Date: Thu, 10 Nov 2005 06:04:50 +0000
Subject: The auto_link text helper accepts an optional block to format the
 link text for each url and email address.  References #2628.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2963 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/CHANGELOG                              |  4 ++-
 actionpack/lib/action_view/helpers/text_helper.rb | 39 +++++++++++++++++------
 actionpack/test/template/text_helper_test.rb      |  7 ++++
 3 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index aaf2182c60..d9e4bb1053 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,6 +1,8 @@
 *SVN*
 
-* assert_tag uses exact matches for string conditions, instead of partial matches. Use regex to do partial matches. #2799
+* The auto_link text helper accepts an optional block to format the link text for each url and email address.  Example: auto_link(post.body) { |text| truncate(text, 10) }  [Jeremy Kemper]
+
+* assert_tag uses exact matches for string conditions, instead of partial matches. Use regex to do partial matches. #2799 [Jamis Buck]
 
 * CGI::Session::ActiveRecordStore.data_column_name = 'foobar' to use a different session data column than the 'data' default.  [nbpwie102@sneakemail.com]
 
diff --git a/actionpack/lib/action_view/helpers/text_helper.rb b/actionpack/lib/action_view/helpers/text_helper.rb
index e19ba8a66c..b31668203e 100644
--- a/actionpack/lib/action_view/helpers/text_helper.rb
+++ b/actionpack/lib/action_view/helpers/text_helper.rb
@@ -135,11 +135,17 @@ module ActionView
       #   auto_link("Go to http://www.rubyonrails.com and say hello to david@loudthinking.com") =>
       #     Go to <a href="http://www.rubyonrails.com">http://www.rubyonrails.com</a> and
       #     say hello to <a href="mailto:david@loudthinking.com">david@loudthinking.com</a>
-      def auto_link(text, link = :all, href_options = {})
+      #
+      # If a block is given, each url and email address is yielded and the
+      # result is used as the link text.  Example:
+      #   auto_link(post.body, :all, :target => '_blank') do |text|
+      #     truncate(text, 15)
+      #   end
+      def auto_link(text, link = :all, href_options = {}, &block)
         case link
-          when :all             then auto_link_urls(auto_link_email_addresses(text), href_options)
-          when :email_addresses then auto_link_email_addresses(text)
-          when :urls            then auto_link_urls(text, href_options)
+          when :all             then auto_link_urls(auto_link_email_addresses(text, &block), href_options, &block)
+          when :email_addresses then auto_link_email_addresses(text, &block)
+          when :urls            then auto_link_urls(text, href_options, &block)
         end
       end
 
@@ -325,22 +331,37 @@ module ActionView
                         ([[:punct:]]|\s|<|$)    # trailing text
                        /x unless const_defined?(:AUTO_LINK_RE)
 
-        # Turns all urls into clickable links.
+        # Turns all urls into clickable links.  If a block is given, each url
+        # is yielded and the result is used as the link text.  Example:
+        #   auto_link_urls(post.body, :all, :target => '_blank') do |text|
+        #     truncate(text, 15)
+        #   end
         def auto_link_urls(text, href_options = {})
+          extra_options = tag_options(href_options.stringify_keys) || ""
           text.gsub(AUTO_LINK_RE) do
             all, a, b, c, d = $&, $1, $2, $3, $5
             if a =~ /<a\s/i # don't replace URL's that are already linked
               all
             else
-              extra_options = tag_options(href_options.stringify_keys) || ""
-              %(#{a}<a href="#{b=="www."?"http://www.":b}#{c}"#{extra_options}>#{b}#{c}</a>#{d})
+              text = b + c
+              text = yield(text) if block_given?
+              %(#{a}<a href="#{b=="www."?"http://www.":b}#{c}"#{extra_options}>#{text}</a>#{d})
             end
           end
         end
 
-        # Turns all email addresses into clickable links.
+        # Turns all email addresses into clickable links.  If a block is given,
+        # each email is yielded and the result is used as the link text.
+        # Example:
+        #   auto_link_email_addresses(post.body) do |text|
+        #     truncate(text, 15)
+        #   end
         def auto_link_email_addresses(text)
-          text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/, '<a href="mailto:\1">\1</a>')
+          text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do
+            text = $1
+            text = yield(text) if block_given?
+            %{<a href="mailto:#{$1}">#{text}</a>}
+          end
         end
     end
   end
diff --git a/actionpack/test/template/text_helper_test.rb b/actionpack/test/template/text_helper_test.rb
index ef6c837c9f..d43bc43b9c 100644
--- a/actionpack/test/template/text_helper_test.rb
+++ b/actionpack/test/template/text_helper_test.rb
@@ -161,6 +161,13 @@ class TextHelperTest < Test::Unit::TestCase
     assert_equal %(<p><a href="#{url1}">#{url1}</a><br /><a href="#{url2}">#{url2}</a><br /></p>), auto_link("<p>#{url1}<br />#{url2}<br /></p>")
   end
 
+  def test_auto_link_with_block
+    url = "http://api.rubyonrails.com/Foo.html"
+    email = "fantabulous@shiznadel.ic"
+
+    assert_equal %(<p><a href="#{url}">#{url[0..7]}...</a><br /><a href="mailto:#{email}">#{email[0..7]}...</a><br /></p>), auto_link("<p>#{url}<br />#{email}<br /></p>") { |url| truncate(url, 10) }
+  end
+
   def test_sanitize_form
     raw = "<form action=\"/foo/bar\" method=\"post\"><input></form>"
     result = sanitize(raw)
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