Starting a custom clock in python.

ansible/roles/sway/files/style.css

@@ -51,6 +51,7 @@
 #clock,
 #cpu,
 #custom-keyboard-layout,
+#custom-clock,
 #memory,
 #mode,
 #network,

ansible/roles/sway/files/waybar_config.json

@@ -20,7 +20,7 @@
     "spacing": 10
   },
   "custom/clock": {
-    "exec": "$HOME/.bin/.waybar_date",
+    "exec": "waybar_custom_clock",
     "return-type": "json",
     "restart-interval": 30
   }

ansible/roles/sway/files/waybar_custom_clock.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+#
+# Custom waybar module for clocks. Implemented because the official clock module was downloading timezone definitions on every boot.
+import json
+import sys
+import time
+from dataclasses import dataclass
+from typing import Final, List, Optional
+
+INTERVAL: Final[int] = 10
+
+
+@dataclass
+class Update:
+    text: Optional[str]
+    alt: Optional[str]
+    tooltip: Optional[str]
+    css_class: Optional[List[str]]
+    percentage: Optional[str]
+
+    def dump(self) -> str:
+        # Dump a dict because we can't name our member variable "class"
+        return json.dumps(
+            {
+                k: v
+                for k, v in {
+                    "text": self.text,
+                    "alt": self.alt,
+                    "tooltip": self.tooltip,
+                    "class": self.css_class,
+                    "percentage": self.percentage,
+                }.items()
+                if v is not None
+            }
+        )
+
+
+def main():
+    next_update = time.time()
+    while True:
+        time_before_next_update = next_update - time.time()
+        if time_before_next_update > 0:
+            time.sleep(time_before_next_update)
+        next_update = time.time() + INTERVAL
+        argv = json.dumps(sys.argv)
+        out = Update(
+            text="foo", alt=argv, tooltip=argv, css_class=["foo"], percentage="100"
+        )
+        print(out.dump(), flush=True)
+
+
+if __name__ == "__main__":
+    main()

ansible/roles/sway/tasks/common.yaml

@@ -1,3 +1,14 @@
+- name: Install scripts
+  copy:
+    src: "files/{{ item.src }}"
+    dest: "{{ item.dest }}"
+    mode: 0755
+    owner: root
+    group: wheel
+  loop:
+    - src: waybar_custom_clock.py
+      dest: /usr/local/bin/waybar_custom_clock
+
 - import_tasks: tasks/freebsd.yaml
   when: 'os_flavor == "freebsd"'