feat(island): pure logic for icons, dot colours and events

The island's decisions that do not need a running shell: which volume icon,
which colour a VM dot takes, which flag a keymap shows, the order of the
privacy segments, and how an openwindow event splits. Kept out of QML so
node can check them.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/desktop/island/Logic.js b/desktop/island/Logic.js
new file mode 100644
index 0000000..8df35de
--- /dev/null
+++ b/desktop/island/Logic.js
@@ -0,0 +1,62 @@
+.pragma library
+
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// The default sink's icon name. Thresholds in thirds, as waybar's wb-icon did.
+function volumeIcon(volume, muted) {
+    if (muted || volume <= 0) return "audio-volume-muted";
+    if (volume < 0.33) return "audio-volume-low";
+    if (volume < 0.66) return "audio-volume-medium";
+    return "audio-volume-high";
+}
+
+// A VM's dot colour as a Theme property name, or "" for no dot. States are
+// the names Virsh._stateName gives libvirt's enum: "blocked" is what virsh
+// list prints as idle, "suspended" is pmsuspended. A shut-off VM only gets a
+// dot when it carries a managed save, because starting it is then a restore.
+function vmRole(vm) {
+    if (!vm || !vm.state) return "";
+    if (vm.state === "shut off") return vm.saved ? "blue" : "";
+    return ({
+        "running": "green",
+        "paused": "yellow",
+        "blocked": "yellow",
+        "shutting down": "yellow",
+        "suspended": "accent",
+        "crashed": "red",
+    })[vm.state] || "";
+}
+
+// Flag image for a Hyprland active_keymap string, wb-lang's mapping.
+function flagFor(keymap) {
+    if (!keymap || keymap.startsWith("Italian")) return "flag-it.svg";
+    return "burger.svg";
+}
+
+// Active capture kinds as Theme property names, in a fixed order so the
+// sliver's segments do not shuffle.
+function privacyRoles(mic, cam, loc, scr) {
+    const out = [];
+    if (mic) out.push("green");
+    if (cam) out.push("yellow");
+    if (loc) out.push("blue");
+    if (scr) out.push("red");
+    return out;
+}
+
+// Hyprland's openwindow event data: "address,workspace,class,title". The
+// title is last and may contain commas, so only the first three fields are
+// read.
+function parseOpenWindow(data) {
+    const p = String(data || "").split(",");
+    return { address: p[0] || "", workspace: p[1] || "", appClass: p[2] || "" };
+}