This Roll20 script sets the has sight setting for mass tokens. Use with caution. Command is: !set-has-sight --[true|false] --[npc|pc|all]

Mass Sight

on('ready',()=>{

    const playerCanControl = (obj, playerid='any') => {
        const playerInControlledByList = (list, playerid) => list.includes('all') || list.includes(playerid) || ('any'===playerid && list.length);
        let players = obj.get('controlledby')
            .split(/,/)
            .filter(s=>s.length);

        if(playerInControlledByList(players,playerid)){
            return true;
        }

        if('' !== obj.get('represents') ) {
            players = (getObj('character',obj.get('represents')) || {get: function(){return '';} } )
                .get('controlledby').split(/,/)
                .filter(s=>s.length);
            return  playerInControlledByList(players,playerid);
        }
        return false;
    };

    const setHasSightByClass = (type, value) => {
        let filter = () => true;

        switch(type.toLowerCase()){
            default:
            case 'npcs':
                filter=(t)=> ! playerCanControl(t);
                break;

            case 'players':
                filter=(t)=> playerCanControl(t);
                break;

            case 'all':
                break;
        }


        let tokens = findObjs({
            type: 'graphic',
			subtype: 'token',
			light_hassight: !value  // only need to look at ones we would be changing =D
        }).filter(filter);

        let tokenCount = tokens.length;

        const burndown = () => {
            if(tokens.length) {
                let t = tokens.shift();
                if(t) {
                    t.set({
                        light_hassight: value
                    });
                }
                setTimeout(burndown,0);
            } else {
                sendChat('',`/w gm Set ${tokenCount} token(s) to ${value?'Has Sight':'No Sight'}`);
            }
        };

        burndown();
    };

    on('chat:message',(msg)=>{
        if('api' === msg.type && /!set-has-sight\b/i.test(msg.content)){
            let args = msg.content.split(/\s+/).map(s=>s.toLowerCase());
            let type = 'npcs';
            let value = false;

            if(args.includes('--npcs') || args.includes('--npc')){
                type = 'npcs';
            } else if(args.includes('--pcs') || args.includes('--pc') || args.includes('--players') || args.includes('--player') ){
                type = 'players';
            } else if(args.includes('--all') ){
                type = 'all';
            }

            if(args.includes('--sight') || args.includes('--true') ) {
                value = true;
            } else if( args.includes('--blind') || args.includes('--false') ) {
                value = false;
            }

            setHasSightByClass(type,value);
        }
    });
});