feat(waybar): implement custom systemd status

users/price/dots/.config/waybar/config

@@ -20,7 +20,7 @@
         ],
         "modules-right": [
             "privacy",
-            "systemd-failed-units",
+            "custom/systemd-failed-units",
             "tray",
             "backlight",
             "network",
@@ -225,10 +225,10 @@
             "icon-spacing": 2,
             "icon-size": 14,
         },
-        "systemd-failed-units": {
-            "format": "✗ Degraded Units: {nr_failed}",
-            "system": true,
-            "user": true
+        "custom/systemd-failed-units": {
+            "exec": "~/.config/waybar/scripts/systemd-status.py",
+            "return-type": "json",
+            "interval": 3
         },
         "tray": {
             "icon-size": 14

users/price/dots/.config/waybar/scripts/systemd-status.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env -S nix shell nixpkgs#python3 nixpkgs#nix-prefetch-git --command python3
+
+from enum import Enum
+import subprocess
+import json
+from typing import NotRequired, TypedDict
+
+
+class SystemUnitStatus(str, Enum):
+    Ok = "ok"
+    Degraded = "degraded"
+
+
+WaybarJsonRet = TypedDict(
+    "WaybarJsonRet",
+    {
+        "text": str,
+        "class": SystemUnitStatus,
+        "alt": NotRequired[str],
+        "tooltip": NotRequired[str],
+        "percentage": NotRequired[str],
+    },
+)
+
+
+class FailedUnit(TypedDict):
+    unit: str
+    load: str
+    active: str
+    sub: str
+    description: str
+
+
+def get_failed_units(extra_args: list[str] | None = None) -> list[FailedUnit]:
+    extra_args = extra_args or []
+    args = ["systemctl", "--state=failed", "--output=json"]
+    args.extend(extra_args)
+
+    units_proc = subprocess.run(args, capture_output=True)
+    units_proc.check_returncode()
+    failed_units: list[FailedUnit] = json.loads(units_proc.stdout)
+
+    return failed_units
+
+
+system_failed_units = get_failed_units()
+user_failed_units = get_failed_units(["--user"])
+total_units_failed = len(system_failed_units) + len(user_failed_units)
+
+status: SystemUnitStatus = SystemUnitStatus.Ok
+text = ""
+failed_units_tooltip: list[str] = []
+
+if total_units_failed > 0:
+    text = f" Degraded Units: {total_units_failed}"
+    status = SystemUnitStatus.Degraded
+    failed_units_tooltip.extend(
+        map(
+            lambda unit: f"<b><span color='#FFA066'>System</span> <span color='#FF5D62'>></span> {unit["unit"]}</b>",
+            system_failed_units,
+        )
+    )
+    failed_units_tooltip.extend(
+        map(
+            lambda unit: f"<b><span color='#FFA066'>User</span>   <span color='#FF5D62'>></span> {unit["unit"]}</b>",
+            user_failed_units,
+        )
+    )
+
+
+out: WaybarJsonRet = {
+    "text": text,
+    "class": status,
+    "tooltip": "\r\n".join(failed_units_tooltip),
+}
+
+print(json.dumps(out))

users/price/dots/.config/waybar/style.css

@@ -72,7 +72,7 @@ tooltip label,
 #tray,
 #backlight,
 #privacy,
-#systemd-failed-units,
+#custom-systemd-failed-units,
 #tray menu,
 #custom-lock {
   background-color: #16161d;
@@ -285,11 +285,11 @@ tooltip {
   color: #A3D4D5;
 }
 
-#systemd-failed-units.ok {
+#custom-systemd-failed-units.ok {
   color: #98BB6C;
 }
 
-#systemd-failed-units.degraded {
+#custom-systemd-failed-units.degraded {
   color: #FF5D62;
   font-weight: bolder;
 }