denis-sokolov/portent

'use strict';

var fileExists = require('./util/exists');

module.exports = function(imgpath){
    return {
        middleware: function(req, res, next){
            if (req.path !== '/favicon.png')
                return next();
            fileExists(imgpath)
                .then(function(exists){
                    if (exists)
                        return res.sendFile(imgpath);
                    next();
                })
                .then(null, next);
        },
        paths: function(){
            return fileExists(imgpath)
                .then(exists => exists ? ['favicon.png'] : []);
        },
        modifyHtml: function($, env){
            return fileExists(imgpath)
                .then(function(exists){
                    if (exists && $('link[rel="icon"]').length === 0) {
                        var tag = $('<link rel=icon>').attr('href', 'favicon.png');
                        env.appendToHead(tag);
                    }
                });
        }
    };
};