notify: one "balloon on screen" check, NotifyConfig.shown

The desktop companion needs to know when a balloon is showing in her
corner, and the rule lived inline in NotificationBalloon's visible
binding. It moves to the shared library so both shells ask the same
function: drawer, snooze, mute, DND, then expiry.

Shared files do not hot-reload through their links: restart the
notifications and desktop shells after pulling this.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/shared/test_notify_config.js b/shared/test_notify_config.js
index c7bc2cc..4e8db23 100644
--- a/shared/test_notify_config.js
+++ b/shared/test_notify_config.js
@@ -18,7 +18,7 @@ const assert = require("assert");
 
 const src = fs.readFileSync(__dirname + "/NotifyConfig.js", "utf8")
     .replace(/^\.pragma library$/m, "");
-const C = new Function(src + "\nreturn { defaults, resolve, withheld, soundFor };")();
+const C = new Function(src + "\nreturn { defaults, resolve, withheld, soundFor, shown };")();
 
 // Nothing, or garbage, is the defaults.
 assert.deepStrictEqual(C.resolve(undefined), C.defaults());
@@ -64,4 +64,16 @@ assert.strictEqual(C.soundFor(sc, sn("critical", "/app.oga", true)), "");
 // An old daemon publishes neither field.
 assert.strictEqual(C.soundFor(sc, { app: "x", urgency: "critical" }), "/c.oga");
 
+// On screen: the drawer, snooze, mute, DND and expiry, in one check that
+// the balloons and the desktop companion share.
+const live = { app: "ok", urgency: "normal", expires: 0 };
+assert.strictEqual(C.shown(cfg, live, false, false, 0, 5000), true);
+assert.strictEqual(C.shown(cfg, live, false, true, 0, 5000), false);           // drawer open
+assert.strictEqual(C.shown(cfg, live, false, false, 6000, 5000), false);       // snoozed
+assert.strictEqual(C.shown(cfg, { app: "spam", urgency: "normal", expires: 0 }, false, false, 0, 5000), false);
+assert.strictEqual(C.shown(cfg, live, true, false, 0, 5000), false);           // DND
+const timed = { app: "ok", urgency: "normal", expires: 5000 };
+assert.strictEqual(C.shown(cfg, timed, false, false, 0, 4999), true);
+assert.strictEqual(C.shown(cfg, timed, false, false, 0, 5000), false);         // expired
+
 console.log("ok");