Set up waybar and building ISOs.

nix/configuration/roles/waybar/files/style.css

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+/* Work-around for regressions introduced in 0.9.15 */
+* {
+  all: unset;
+}
+
+/* Reset all styles */
+* {
+  border: none;
+  border-radius: 0;
+  min-height: 0;
+  margin: 0;
+  padding: 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Keyframes
+ * -------------------------------------------------------------------------- */
+
+@keyframes blink-warning {
+  70% {
+    color: white;
+  }
+
+  to {
+    color: white;
+    background-color: orange;
+  }
+}
+
+@keyframes blink-critical {
+  70% {
+    color: white;
+  }
+
+  to {
+    color: white;
+    background-color: red;
+  }
+}
+
+/* -----------------------------------------------------------------------------
+ * Base styles
+ * -------------------------------------------------------------------------- */
+
+/* The whole bar */
+#waybar {
+  background: #323232;
+  color: white;
+  font-family:
+    Cascadia Mono,
+    monospace;
+  font-size: 10px;
+}
+
+tooltip {
+  background-color: #323232;
+}
+
+/* Each module */
+#battery,
+#clock,
+#cpu,
+#custom-available_memory,
+#custom-battery,
+#custom-clock,
+#custom-night_mode,
+#custom-sound,
+#custom-temperature,
+#idle_inhibitor,
+#memory,
+#mode,
+#network,
+#pulseaudio,
+#temperature,
+#tray {
+  padding-left: 10px;
+  padding-right: 10px;
+  border: 1px solid white;
+}
+
+/* -----------------------------------------------------------------------------
+ * Module styles
+ * -------------------------------------------------------------------------- */
+
+#battery {
+  animation-timing-function: linear;
+  animation-iteration-count: infinite;
+  animation-direction: alternate;
+}
+
+#custom-battery.warning {
+  color: orange;
+}
+
+#custom-battery.critical {
+  color: red;
+}
+
+#battery.warning.discharging {
+  animation-name: blink-warning;
+  animation-duration: 3s;
+}
+
+#battery.critical.discharging {
+  animation-name: blink-critical;
+  animation-duration: 2s;
+}
+
+#clock {
+  font-weight: bold;
+}
+
+#custom-clock {
+  font-weight: bold;
+}
+
+#cpu {
+  /* No styles */
+}
+
+#cpu.warning {
+  color: orange;
+}
+
+#cpu.critical {
+  color: red;
+}
+
+#memory {
+  animation-timing-function: linear;
+  animation-iteration-count: infinite;
+  animation-direction: alternate;
+}
+
+#memory.warning {
+  color: orange;
+}
+
+#memory.critical {
+  color: red;
+  animation-name: blink-critical;
+  animation-duration: 2s;
+}
+
+#mode {
+  background: #64727d;
+  border-top: 2px solid white;
+  /* To compensate for the top border and still have vertical centering */
+  padding-bottom: 2px;
+}
+
+#window {
+  padding-left: 10px;
+  padding-right: 10px;
+}
+
+#network {
+  /* No styles */
+}
+
+#network.disconnected {
+  color: orange;
+}
+
+#pulseaudio {
+  /* No styles */
+}
+
+#pulseaudio.muted {
+  /* No styles */
+}
+
+#custom-spotify {
+  color: rgb(102, 220, 105);
+}
+
+#temperature {
+  /* No styles */
+}
+
+#temperature.critical {
+  color: red;
+}
+
+#tray {
+  /* No styles */
+}
+
+#window {
+  font-weight: bold;
+}
+
+#workspaces button {
+  border-top: 2px solid transparent;
+  /* To compensate for the top border and still have vertical centering */
+  padding-bottom: 2px;
+  padding-left: 10px;
+  padding-right: 10px;
+  color: #888888;
+}
+
+#workspaces button.focused {
+  border-color: #4c7899;
+  color: white;
+  background-color: #285577;
+}
+
+#workspaces button.urgent {
+  border-color: #c9545d;
+  color: #c9545d;
+}

nix/configuration/roles/waybar/files/waybar_config.json

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+{
+  // "height": 10, // Waybar height (to be removed for auto height)
+  "modules-left": ["sway/workspaces", "sway/mode"],
+  "modules-center": ["sway/window"],
+  "modules-right": ["custom/night_mode", "custom/temperature", "custom/sound", "custom/available_memory", "custom/battery", "idle_inhibitor", "custom/clock", "tray"],
+  "sway/workspaces": {
+    "disable-scroll": true
+  },
+  "sway/mode": {
+    "format": "<span style=\"italic\">{}</span>"
+  },
+  "sway/window": {
+    "format": "{title}"
+  },
+  "idle_inhibitor": {
+    "format": "{icon}",
+    "format-icons": {
+      "activated": "☕",//☕
+      "deactivated": "💤"//☾☁⛾⛔⏾⌛⏳💤
+    }
+  },
+  "tray": {
+    // "icon-size": 21,
+    "spacing": 10
+  },
+  "custom/clock": {
+    "exec": "waybar_custom_clock",
+    "return-type": "json",
+    "restart-interval": 30
+  },
+  "custom/battery": {
+    "exec": "waybar_custom_battery",
+    "return-type": "json",
+    "restart-interval": 30
+  },
+  "custom/available_memory": {
+    "exec": "waybar_custom_available_memory",
+    "return-type": "json",
+    "restart-interval": 30
+  },
+  "custom/sound": {
+    "exec": "waybar_custom_sound",
+    "return-type": "json",
+    "restart-interval": 30
+  },
+  "custom/temperature": {
+    "exec": "waybar_custom_temperature",
+    "return-type": "json",
+    "restart-interval": 30
+  },
+  "custom/night_mode": {
+    "exec": "waybar_night_mode",
+    "return-type": "json",
+    "restart-interval": 30,
+    "on-click": "pkill -USR1 -f waybar_night_mode"
+  }
+}