Function windowMatchingCost

src/manager/msWindowManager.ts:82–114

Cost for associating the the given metaWindow to the msWindow. * * windowInfo are the matching details for the meta window, for example its window title. * * A higher returned cost means the match is less desirable.

(
    windowInfo: MsWindowMatchingInfo,
    metaWindow: Meta.Window,
    msWindow: MsWindow
)

 * A higher returned cost means the match is less desirable.
 */
function windowMatchingCost(
    windowInfo: MsWindowMatchingInfo,
    metaWindow: Meta.Window,
    msWindow: MsWindow
) {
    const state = msWindow.lifecycleState;
    assert(
        state.type === 'window' || state.type === 'app-placeholder',
        'MsWindow has no matching info'
    );
    const matchingInfo = state.matchingInfo;

    let cost = 0;
    // The wmClass *must* match if specified
    cost += matchingCost(matchingInfo.wmClass, windowInfo.wmClass, INF_COST, 1);
    cost += matchingCost(matchingInfo.pid, windowInfo.pid, 100, 1);
    cost += matchingCost(matchingInfo.title, windowInfo.title, 50, 1);
    cost += matchingCost(matchingInfo.stableSeq, windowInfo.stableSeq, 1, 1);

    const msWindowMeta =
        state.type === 'window' ? state.metaWindow ?? undefined : undefined;
    // Prefer to keep existing matchings
    cost += msWindowMeta === metaWindow ? 0 : 5;

    const waiting =
        state.type === 'app-placeholder'
            ? state.waitingForAppSince !== undefined
            : state.matchedWhileWaiting;
    // Prefer matching to MsWindows which are waiting for an app to open
    cost += waiting ? 0 : 200;

    return cost;
}

export type MsWindowManagerType = InstanceType<typeof MsWindowManager>;
export class MsWindowManager extends MsManager {