applets: add simple applet library

artiq/applets/simple.py

@@ -0,0 +1,65 @@
+import argparse
+import asyncio
+
+from quamash import QEventLoop, QtWidgets, QtCore
+
+from artiq.protocols.sync_struct import Subscriber
+
+
+class SimpleApplet:
+    def __init__(self, main_widget_class, cmd_description=None):
+        self.main_widget_class = main_widget_class
+
+        self.argparser = argparse.ArgumentParser(description=cmd_description)
+        group = self.argparser.add_argument_group("data server")
+        group.add_argument(
+            "--server", default="::1",
+            help="hostname or IP to connect to")
+        group.add_argument(
+            "--port", default=3250, type=int,
+            help="TCP port to connect to")
+        self._arggroup_datasets = self.argparser.add_argument_group("datasets")
+
+    def add_dataset(self, name, help=None):
+        if help is None:
+            self._arggroup_datasets.add_argument(name)
+        else:
+            self._arggroup_datasets.add_argument(name, help=help)
+
+    def args_init(self):
+        self.args = self.argparser.parse_args()
+
+    def quamash_init(self):
+        app = QtWidgets.QApplication([])
+        self.loop = QEventLoop(app)
+        asyncio.set_event_loop(self.loop)
+
+    def create_main_widget(self):
+        self.main_widget = self.main_widget_class(self.args)
+        self.main_widget.show()
+
+    def sub_init(self, data):
+        self.data = data
+        return data
+
+    def sub_mod(self, mod):
+        self.main_widget.data_changed(self.data, mod)
+
+    def create_subscriber(self):
+        self.subscriber = Subscriber("datasets",
+                                     self.sub_init, self.sub_mod)
+        self.loop.run_until_complete(self.subscriber.connect(
+            self.args.server, self.args.port))
+
+    def run(self):
+        self.args_init()
+        self.quamash_init()
+        try:
+            self.create_main_widget()
+            self.create_subscriber()
+            try:
+                self.loop.run_forever()
+            finally:
+                self.loop.run_until_complete(self.subscriber.close())
+        finally:
+            self.loop.close()