waybar: Improve events block icon rendering

Using the 'alt' json return field to set the icon and change the icon
within waybar itself instead of doing so manually in the script. This
makes us a little more flexible and puts all the 'what' is rendered that
is specific to waybar into waybar (keeping the 'how' it's rendered in
the style.css).

desktop/.config/waybar/config

@@ -49,12 +49,16 @@
         "on-click-right": "$TERMINAL start --class float glances"
     },
     "custom/events": {
-        "format": "{}",
-        "interval": 300,
-        "exec": "~/.config/waybar/modules/khal.py 2>/dev/null",
         "exec-if": "command -v khal >/dev/null 2>&1",
+        "exec": "~/.config/waybar/modules/khal.py 2>/dev/null",
         "return-type": "json",
-        "on-click": "$TERMINAL start --class float ikhal"
+        "interval": 300,
+        "on-click": "$TERMINAL start --class float ikhal",
+        "format": "{icon}{}",
+        "format-icons": {
+            "event": "   ",
+            "no-event": "",
+        },
     },
     "memory": {
         "interval": 30,
@@ -138,7 +142,7 @@
         "tag-labels": [ "", "", "", "", "", "", "", "", "", "" ]
     },
     "river/mode": {
-        "format": "{} 󱐁",
+        "format": "{} ",
     },
     "river/window": {
         "format": "   {}",
@@ -172,7 +176,7 @@
         "interval": 60,
     },
     "custom/vidl": {
-        "format": "{} {icon}",
+        "format": "{icon}{}",
         "format-alt-click": "right",
         "format-icons": {
             "default": "   "

desktop/.config/waybar/modules/khal.py

@@ -29,11 +29,11 @@ for line in lines:
     new_lines.append(clean_line)
 output = "\n".join(new_lines).strip()
 
-if today in output:
-    data["text"] = "  " + output.split("\n")[1]
-else:
-    data["text"] = ""
-
+data["alt"] = "no-event"
 data["tooltip"] = output
 
+if today in output:
+    data["text"] = output.split("\n")[1]
+    data["alt"] = "event"
+
 print(json.dumps(data))