Select Opacity Keyframes

// Cavalry Script: Keyfast - Select opacity keyframes

(function selectOpacityKeyframes() {
    var OP_ATTRS = ["opacity", "shapeOpacity"]; // common variants

    var isOpacityAttr = function(attrPath) {
        if (!attrPath || typeof attrPath !== "string") return false;
        var a = ("" + attrPath).toLowerCase();
        if (a === "opacity") return true;
        if (a.indexOf(".opacity") !== -1) return true; // e.g., material.opacity
        if (a.indexOf("shapeopacity") !== -1) return true;
        return false;
    };

    var uniq = function(arr) { var m = {}; var out = []; for (var i=0;i<arr.length;i++){ var v=arr[i]; if(!m[v]){ m[v]=true; out.push(v);} } return out; };

    var listOpacityAttributes = function(layerId) {
        var attrs = [];
        try { var animated = (typeof api.getAnimatedAttributes === "function") ? (api.getAnimatedAttributes(layerId) || []) : []; for (var i=0;i<animated.length;i++) if (isOpacityAttr(animated[i])) attrs.push(animated[i]); } catch (_) {}
        for (var j=0;j<OP_ATTRS.length;j++) if (attrs.indexOf(OP_ATTRS[j]) === -1) attrs.push(OP_ATTRS[j]);
        return attrs;
    };

    var getOpacityKeyIdsForLayer = function(layerId) {
        var ids = [];
        var opAttrs = listOpacityAttributes(layerId);
        for (var i=0;i<opAttrs.length;i++) {
            var attr = opAttrs[i];
            try {
                var kIds = (typeof api.getKeyframeIdsForAttribute === "function") ? (api.getKeyframeIdsForAttribute(layerId, attr) || []) : [];
                for (var k=0;k<kIds.length;k++) ids.push(kIds[k]);
            } catch (_) {}
        }
        return ids;
    };

    var selectedKeyIds = [];
    try { selectedKeyIds = api.getSelectedKeyframeIds() || []; } catch (_) { selectedKeyIds = []; }