Watches HBS partials.

watchHbsPartials.js

// 2013 Filip Weiss
var fs = require("fs");
var path = require("path");

// config
var partialsDir = __dirname + '/../views/partials';
var hbs;

exports.watch = function(_partialsDir, _hbs){
    hbs = _hbs;
    partialsDir = _partialsDir;
    
    fs.watch(partialsDir, function(event, filename){
        var file = partialsDir + "/" + filename;
        if (event == "rename"){        
            if(fs.existsSync(file)) registerPartial(file);
            else unregisterPartial(file);
            
        } else if(fs.existsSync(file)) registerPartial(file);  
    });
    updateAllPartials(hbs);
};

function registerPartial(f){
    var filename = path.basename(f);
    var matches = /^([^.]+).html$/.exec(filename);
    if (!matches) return;
    var name = matches[1];
    
    var template = fs.readFileSync(f, 'utf8');
    hbs.registerPartial(name, template);
}

function unregisterPartial(f){
    var filename = path.basename(f, '.html');
    if (hbs.handlebars.partials[filename] !== undefined) delete hbs.handlebars.partials[filename];
    else return;
}

function updateAllPartials(hbs){  
    var filenames = fs.readdirSync(partialsDir);   
    filenames.forEach(function (filename) {
        var matches = /^([^.]+).html$/.exec(filename);
        if (!matches) return;
        var name = matches[1];
        var template = fs.readFileSync(partialsDir + "/" + filename, 'utf8');
        hbs.registerPartial(name, template);
    });
}