Add support for a `gunicorn_pecan` console script.

pecan/commands/serve.py

@@ -132,3 +132,49 @@ class ServeCommand(BaseCommand):
                 print('   $ pip install watchdog')
         else:
             self._serve(app, conf)
+
+
+def gunicorn_run():
+    """
+    The ``gunicorn_pecan`` command for launching ``pecan`` applications
+    """
+    try:
+        from gunicorn.app.wsgiapp import WSGIApplication
+    except ImportError as exc:
+        args = exc.args
+        arg0 = args[0] if args else ''
+        arg0 += ' (are you sure `gunicorn` is installed?)'
+        exc.args = (arg0,) + args[1:]
+        raise
+
+    class PecanApplication(WSGIApplication):
+
+        def init(self, parser, opts, args):
+            if len(args) != 1:
+                parser.error("No configuration file was specified.")
+
+            self.cfgfname = os.path.normpath(
+                os.path.join(os.getcwd(), args[0])
+            )
+            self.cfgfname = os.path.abspath(self.cfgfname)
+            if not os.path.exists(self.cfgfname):
+                parser.error("Config file not found: %s" % self.cfgfname)
+
+            from pecan.configuration import _runtime_conf, set_config
+            set_config(self.cfgfname, overwrite=True)
+
+            # If available, use the host and port from the pecan config file
+            cfg = {}
+            if _runtime_conf.get('server'):
+                server = _runtime_conf['server']
+                if hasattr(server, 'host') and hasattr(server, 'port'):
+                    cfg['bind'] = '%s:%s' % (
+                        server.host, server.port
+                    )
+            return cfg
+
+        def load(self):
+            from pecan.deploy import deploy
+            return deploy(self.cfgfname)
+
+    PecanApplication("%(prog)s [OPTIONS] config.py").run()