Give Sound the whole story, and keep the buttons inside the card
Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8
This commit is contained in:
Gabriel Brown
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pragma Singleton
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// Native device profiles -- the sound card's own idea of what it can be.
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//
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// A card is one piece of hardware; a profile is one wiring of it. The rear
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// Realtek can be analog stereo out, or S/PDIF out, or duplex with the line-in
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// live, but only one at a time, and switching costs the sinks and sources the
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// old profile provided. That choice is not a PipeWire node property, so
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// Quickshell's PipeWire bindings cannot see it at all -- which is why this file
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// shells out where AudioDevices must not.
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//
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// `pactl -f json list cards` is the read side (verified against pactl 17 /
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// pipewire-pulse, which prints profiles and ports as objects keyed by name, not
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// as arrays). `pactl set-card-profile` is the write side. Both talk to
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// pipewire-pulse, which owns card state -- so nothing here races the PipeWire
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// node objects AudioDevices holds.
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import Quickshell
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import Quickshell.Io
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import QtQuick
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Singleton {
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id: root
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// [{ name, description, activeProfile,
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// profiles: [{ name, description, available }], portHint }]
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property var cards: []
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property string lastError: ""
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readonly property bool busy: lister.running || writer.running
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// True once a listing has completed, however it went, so the UI can tell
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// "not looked yet" apart from "no cards on this machine".
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property bool loaded: false
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// A test seam, matching scripts/panama-brightness: point this at a file
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// holding canned `pactl -f json list cards` output and the service parses
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// that instead of the live daemon.
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readonly property string fixturePath: Quickshell.env("PANAMA_SOUND_CARDS_FIXTURE") || ""
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function refresh(): void {
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if (lister.running)
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return;
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lister.command = root.fixturePath !== ""
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? ["cat", root.fixturePath]
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: ["pactl", "-f", "json", "list", "cards"];
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lister.running = true;
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}
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function cardFor(name: string): var {
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return root.cards.find(card => card.name === name) ?? null;
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}
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// Switching profile is immediate and lossy: the sinks the old profile
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// provided disappear. The list is re-read afterwards rather than assumed,
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// because a card may refuse a profile its ports cannot currently support.
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function setProfile(cardName: string, profileName: string): void {
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const card = String(cardName ?? "").trim();
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const profile = String(profileName ?? "").trim();
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if (card === "" || profile === "" || writer.running)
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return;
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writer.command = ["pactl", "set-card-profile", card, profile];
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writer.running = true;
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}
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// The most useful single line about where sound physically comes out.
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//
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// Port availability is the only part of a card's state that answers "is
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// anything plugged in", and it is per-port, so the highest-priority
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// available port is the one worth naming. A card whose ports all report
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// "availability unknown" -- USB devices, mostly -- gets no line rather than
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// a guess, because "unknown" is not "disconnected".
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function portHintFor(ports: var): string {
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let best = null;
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let anyKnown = false;
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for (const key in ports ?? {}) {
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const port = ports[key];
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const availability = String(port?.availability ?? "");
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if (availability === "available" || availability === "not available")
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anyKnown = true;
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if (availability !== "available")
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continue;
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if (!best || Number(port.priority ?? 0) > Number(best.priority ?? 0))
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best = port;
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}
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if (best)
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return `${String(best.description ?? "Port").trim()} connected`;
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return anyKnown ? "No port connected" : "";
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}
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function parse(text: string): void {
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let parsed;
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try {
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parsed = JSON.parse(text);
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} catch (error) {
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root.cards = [];
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root.lastError = "Device profiles could not be read.";
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root.loaded = true;
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return;
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}
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if (!Array.isArray(parsed)) {
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root.cards = [];
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root.lastError = "Device profiles could not be read.";
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root.loaded = true;
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return;
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}
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root.cards = parsed.map(card => {
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const properties = card.properties ?? {};
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const profiles = [];
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for (const key in card.profiles ?? {}) {
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const profile = card.profiles[key];
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profiles.push({
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name: key,
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description: String(profile?.description ?? key),
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available: profile?.available !== false,
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priority: Number(profile?.priority ?? 0)
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});
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}
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// pactl prints profiles in an object, so their order is whatever
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// the daemon happened to build. Priority is the order PulseAudio
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// and GNOME both present them in, and it puts "Off" last for free.
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profiles.sort((a, b) => b.priority - a.priority);
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return {
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name: String(card.name ?? ""),
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description: String(properties["device.description"]
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?? properties["device.nick"]
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?? card.name
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?? "Sound card"),
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activeProfile: String(card.active_profile ?? ""),
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profiles: profiles,
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portHint: root.portHintFor(card.ports)
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};
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}).filter(card => card.name !== "");
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root.lastError = "";
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root.loaded = true;
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}
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Process {
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id: lister
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stdout: StdioCollector {
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onStreamFinished: root.parse(this.text)
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}
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onExited: (code, status) => {
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if (code !== 0) {
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root.cards = [];
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root.lastError = "Device profiles could not be read.";
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root.loaded = true;
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}
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}
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}
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Process {
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id: writer
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onExited: (code, status) => {
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root.lastError = code === 0 ? "" : "That device profile could not be applied.";
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root.refresh();
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}
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}
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}
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