Rewrite command parsing

qutebrowser/app.py

@@ -1,16 +1,16 @@
 import sys
 from PyQt5.QtWidgets import QWidget, QApplication
 from qutebrowser.widgets.mainwindow import MainWindow
-from qutebrowser.commands import CommandParser
+import qutebrowser.commands as cmds
 
 def main():
     app = QApplication(sys.argv)
 
     mw = MainWindow()
-    cp = CommandParser()
+    cp = cmds.CommandParser()
     mw.status.cmd.returnPressed.connect(lambda: cp.parse(mw.status.cmd.text()))
-    cp.openurl.connect(mw.tabs.openurl)
-    cp.tabopen.connect(mw.tabs.tabopen)
+    cmds.cmd_dict['openurl'].connect(mw.tabs.openurl)
+    cmds.cmd_dict['tabopen'].connect(mw.tabs.tabopen)
     mw.show()
 
     sys.exit(app.exec_())

qutebrowser/commands.py

@@ -1,12 +1,44 @@
 from PyQt5.QtCore import QObject, pyqtSignal
+import inspect, sys
+
+cmd_dict = {}
+
+def register_all():
+    def is_cmd(obj):
+        return (inspect.isclass(obj) and obj.__module__ == __name__ and
+                obj.__name__.endswith('Cmd'))
+
+    for (name, cls) in inspect.getmembers(sys.modules[__name__], is_cmd):
+        cls.bind()
 
 class CommandParser(QObject):
-    openurl = pyqtSignal(str)
-    tabopen = pyqtSignal(str)
+    def parse(self, test):
+        parts = text.lstrip(':').strip().split()
+        cmd = parts[0]
+        args = parts[1:]
+        cmd_dict[cmd]().run(args)
 
-    def parse(self, cmd):
-        c = cmd.split()
-        if c[0] == ':open':
-            self.openurl.emit(c[1])
-        elif c[0] == ':tabopen':
-            self.tabopen.emit(c[1])
+class Command(QObject):
+    nargs = 0
+    name = ''
+    signal = None
+
+    @classmethod
+    def bind(cls):
+        if cls.name:
+            cmd_dict[cls.name] = cls
+
+    def run(self, *args):
+        self.signal.emit(*args)
+
+class OpenCmd(Command):
+    nargs = 1
+    name = 'open'
+    signal = pyqtSignal(str)
+
+class TabOpenCmd(Command):
+    nargs = 1
+    name = 'tabopen'
+    signal = pyqtSignal(str)
+
+register_all()