templatizer/templatizer.js

var jade = require('jade');
var beautify = require('./lib/beautify');
var simplifyTemplate = require('./lib/simplifyTemplate');
var transformMixins = require('./lib/transformMixins');
var renameJadeFn = require('./lib/renameJadeFn');
var walkdir = require('walkdir');
var path = require('path');
var _ = require('underscore');
var fs = require('fs');
var uglifyjs = require('uglify-js');
var namedTemplateFn = require('./lib/namedTemplateFn');
var bracketedName = require('./lib/bracketedName');


module.exports = function (templateDirectories, outputFile, options) {
    options || (options = {});

    var internalNamespace = 'templatizer';

    _.defaults(options, {
        dontTransformMixins: false,
        jade: {},
        namespace: '' // No namespace means 'window'
    });

    if (typeof templateDirectories === "string") {
        templateDirectories = [templateDirectories];
    }
    
    var namespace = _.isString(options.namespace) ? options.namespace : '';
    var folders = [];
    var templates = [];
    var _readTemplates = [];
    var isWindows = process.platform === 'win32';
    var pathSep = path.sep || (isWindows ? '\\' : '/');
    var pathSepRegExp = /\/|\\/g;

    // Split our namespace on '.' and use bracket syntax
    if (namespace) {
        namespace = bracketedName(namespace.split('.'));
    }

    // Find jade runtime and create minified code
    // where it is assigned to the variable jade
    var placesToLook = [
        __dirname + '/node_modules/jade/lib/runtime.js',
        __dirname + '/jaderuntime.js'
    ];
    var jadeRuntime = fs.readFileSync(_.find(placesToLook, fs.existsSync)).toString();
    var wrappedJade = uglifyjs.minify('var jade = (function(){var exports={};' + jadeRuntime + 'return exports;})();', {fromString: true}).code;

    var outputTemplate = fs.readFileSync(__dirname + '/output_template.js').toString();
    var output = '';

    var jadeCompileOptions = {
        client: true,
        compileDebug: false,
        pretty: false
    };
    _.extend(jadeCompileOptions, options.jade);

    templateDirectories = _.map(templateDirectories, function (templateDirectory) {
        return templateDirectory.replace(pathSepRegExp, pathSep);
    });

    templateDirectories.forEach(function (templateDirectory) {
        if (!fs.existsSync(templateDirectory)) {
            throw new Error('Template directory ' + templateDirectory + ' does not exist.');
        }

        walkdir.sync(templateDirectory).forEach(function (file) {
            var item = file.replace(path.resolve(templateDirectory), '').slice(1);
            if (path.extname(item) === '' && path.basename(item).charAt(0) !== '.') {
                if (folders.indexOf(item) === -1) folders.push(item);
            } else if (path.extname(item) === '.jade') {
                // Throw an err if we are about to override a template
                if (_readTemplates.indexOf(item) > -1) {
                    throw new Error(item + ' from ' + templateDirectory + pathSep + item + ' already exists in ' + templates[_readTemplates.indexOf(item)]);
                }
                _readTemplates.push(item);
                templates.push(templateDirectory + pathSep + item);
            }
        });

        folders = _.sortBy(folders, function (folder) {
            var arr = folder.split(pathSep);
            return arr.length;
        });
    });

    output += folders.map(function (folder) {
        return internalNamespace + bracketedName(folder.split(pathSep)) + ' = {};';
    }).join('\n') + '\n';

    templates.forEach(function (item) {
        var name = path.basename(item, '.jade');
        var dirString = function () {
            var itemTemplateDir = _.find(templateDirectories, function (templateDirectory) {
                return item.indexOf(templateDirectory + pathSep) === 0;
            });
            var dirname = path.dirname(item).replace(itemTemplateDir, '');
            if (dirname === '.') return name;
            dirname += '.' + name;
            return dirname.substring(1).replace(pathSepRegExp, '.');
        }();

        jadeCompileOptions.filename = item;
        var template = beautify(jade.compileClient(fs.readFileSync(item, 'utf-8'), jadeCompileOptions).toString());

        template = renameJadeFn(template, dirString);
        template = simplifyTemplate(template);

        var mixins = [];
        if (!options.dontTransformMixins) {
            var astResult = transformMixins({
                template: template,
                name: name,
                dir: dirString,
                rootName: internalNamespace
            });
            mixins = astResult.mixins;
            template = astResult.template;
        }

        output += namedTemplateFn({
            dir: dirString,
            rootName: internalNamespace,
            fn: template
        });

        output += mixins.join('\n');
    });

    var indentOutput = output.split('\n').map(function (l) { return l ? '    ' + l : l; }).join('\n');
    var finalOutput = outputTemplate
        .replace(/\{\{namespace\}\}/g, namespace)
        .replace(/\{\{internalNamespace\}\}/g, internalNamespace)
        .replace('{{jade}}', wrappedJade)
        .replace('{{code}}', indentOutput);

    if (outputFile) fs.writeFileSync(outputFile, finalOutput);

    return finalOutput;
};