support heroku's env var for port number

diff --git a/server.coffee b/server.coffee
index 36b6862..196a0b8 100644 (file)
--- a/server.coffee
+++ b/server.coffee
@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-listen_port = process.env.app_port ? 9988
+listen_port = process.env.PORT ? process.env.app_port ? 9988
 sys = require 'sys'
 fs = require 'fs'
 http = require 'http'