schermetto: call command on up/down keypress

schermetto/num_display.py

@@ -4,6 +4,7 @@ import os
 import sys
 import argparse
 import random
+from subprocess import Popen
 
 import gi
 
@@ -45,6 +46,14 @@ def get_parser():
             "this is useful to avoid CRT-burning; use <= 0 to disable"
         ),
     )
+
+    p.add_argument("--on-key-press",
+            type=str,
+            default=None,
+            help="A program to call on up/down keypress. "
+            "It will be called with appropriate arguments "
+            "representing the action  to take.")
+
     return p
 
 
@@ -113,6 +122,10 @@ class App(Gtk.Application):
     def text(self, new_value: str):
         self._text = new_value
 
+    def on_binding_pressed(self, action):
+        print('calling:', action)
+        Popen(self.cli_args.on_key_press.split() + [action])
+
 
 def get_color(description: str) -> Gdk.RGBA:
     rgba = Gdk.RGBA()
@@ -143,6 +156,19 @@ class AppWindow(Gtk.ApplicationWindow):
 
         self.app.connect("notify::text", self.on_text_changed)
 
+        if self.app.cli_args.on_key_press:
+            self.connect("key-press-event", self.on_key_press)
+
+    def on_key_press(self, widget, key: Gdk.EventKey):
+        if key.state != 0 or key.type != Gdk.EventType.KEY_PRESS:
+            return
+
+        if key.keyval == Gdk.KEY_Up:
+            self.app.on_binding_pressed('+1')
+        elif key.keyval == Gdk.KEY_Down:
+            self.app.on_binding_pressed('-1')
+
+
     def force_redraw(self):
         self.drawing_area.queue_draw()