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var _ = require("lodash");
var Q = require("q");
var path = require("path");
var nunjucks = require("nunjucks");
var git = require("./utils/git");
var fs = require("./utils/fs");
var pkg = require("../package.json");
// The loader should handle relative and git url
var BookLoader = nunjucks.Loader.extend({
async: true,
init: function(book) {
this.book = book;
},
getSource: function(fileurl, callback) {
var that = this;
git.resolveFile(fileurl)
.then(function(filepath) {
// Is local file
if (!filepath) filepath = path.resolve(that.book.root, fileurl);
else that.book.logDebug("resolve from git", fileurl, "to", filepath)
// Read file from absolute path
return fs.readFile(filepath)
.then(function(source) {
return {
src: source.toString(),
path: filepath
}
});
})
.nodeify(callback);
}
});
var TemplateEngine = function(book) {
this.book = book;
// Nunjucks env
this.env = new nunjucks.Environment(
new BookLoader(book),
{
// Escaping is done after by the markdown parser
autoescape: false
}
);
};
// Render a file from the book
TemplateEngine.prototype.renderFile = function(filename) {
var that = this;
return that.book.statFile(filename)
.then(function(stat) {
var context = {
// Variables from book.json
book: that.book.options.variables,
// infos about the file
file: {
path: filename,
mtime: stat.mtime
},
// infos about gitbook
gitbook: {
version: pkg.version
}
};
return Q.nfcall(that.env.render.bind(that.env), filename, context);
});
};
module.exports = TemplateEngine;
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