waybar: Add calendar

users/simon/modules/sway/waybar.css

@@ -166,3 +166,8 @@ window#waybar {
   animation-iteration-count: infinite;
   animation-direction: alternate;
 }
+
+#custom-calendar.active {
+  background-color: @base3@;
+  color: @base00@;
+}

users/simon/modules/sway/waybar.nix

@@ -49,6 +49,7 @@ in
       "temperature"
       "battery"
       "clock"
+      "custom/calendar"
     ];
 
     "sway/workspaces" = {
@@ -223,6 +224,41 @@ in
       format-alt = "{:%Y-%m-%d (%a)}";
       tooltip-format = "<big>{:%Y %B}</big>\n<tt><small>{calendar}</small></tt>";
     };
+    "custom/calendar" = {
+      interval = 300;
+      exec = pkgs.writeScript "calendar" ''
+        #!${pkgs.python3}/bin/python3
+        import json
+        import subprocess
+
+
+        def khal(args):
+            completed = subprocess.run(["${pkgs.khal}/bin/khal"] + args, capture_output=True)
+            assert completed.returncode == 0
+            return completed.stdout.decode("utf-8")
+
+
+        events_today = khal(["list", "today", "today", "-df", ""]).rstrip().split("\n")
+        events_2d = khal(["list", "today", "tomorrow", "-df", "<b>{name}, {date}</b>"]).rstrip()
+
+        if len(events_today) == 0:
+            text = " "
+        else:
+            text = f"{len(events_today)}  "
+
+        print(
+            json.dumps(
+                {
+                    "class": "active" if len(events_today) > 0 else "",
+                    "text": text,
+                    "tooltip": events_2d,
+                }
+            )
+        )
+      '';
+      return-type = "json";
+      format = "{}";
+    };
   };
   xdg.configFile."waybar/style.css".source = pkgs.substituteAll ({
     src = ./waybar.css;