search: return matches from open pull requests

When search can't find any local results, hit the GitHub API and search
the titles of pending pull requests. This will help people find the many
proposed formulae and prevent them from wasting time duplicating them.

Closes #9018.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 97fa46f7b..71417e61a 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -427,4 +427,28 @@ module GitHub extend self
   rescue
     []
   end
+
+  def find_pull_requests rx
+    require 'open-uri'
+    require 'vendor/multi_json'
+
+    pulls = []
+    uri = URI.parse("https://api.github.com/repos/mxcl/homebrew/pulls")
+    uri.query = "per_page=100"
+
+    open uri do |f|
+      MultiJson.decode((f.read)).each do |pull|
+        pulls << pull['html_url'] if rx.match pull['title']
+      end
+
+      uri = if f.meta['link'] =~ /rel="next"/
+        f.meta['link'].slice(URI.regexp)
+      else
+        nil
+      end
+    end while uri
+    pulls
+  rescue
+    []
+  end
 end