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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.log.debug.ln("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);
},
resolve: function(from, to) {
return path.resolve(path.dirname(from), to);
}
});
var TemplateEngine = function(book) {
this.book = book;
this.log = this.book.log;
// Nunjucks env
this.env = new nunjucks.Environment(
new BookLoader(book),
{
// Escaping is done after by the markdown parser
autoescape: false,
// Tags
tags: {
blockStart: '{%',
blockEnd: '%}',
variableStart: '{{',
variableEnd: '}}',
commentStart: '{###',
commentEnd: '###}'
}
}
);
};
// Add filter
TemplateEngine.prototype.addFilter = function(filterName, func) {
try {
this.env.getFilter(filterName);
this.log.warn.ln("conflict in filters, '"+filterName+"' is already set");
return false;
} catch(e) {
this.log.debug.ln("add filter '"+filterName+"'");
this.env.addFilter(filterName, func, true);
return true;
}
};
// Render a string from the book
TemplateEngine.prototype.renderString = function(content, context, options) {
var context = _.extend({}, context, {
// Variables from book.json
book: this.book.options.variables,
// infos about gitbook
gitbook: {
version: pkg.version
}
});
options = _.defaults(options || {}, { path: null});
if (options.path) options.path = this.book.resolve(options.path);
return Q.nfcall(this.env.renderString.bind(this.env), content, context, options);
};
// Render a file from the book
TemplateEngine.prototype.renderFile = function(filename, options) {
var that = this, context;
return that.book.readFile(filename)
.then(function(content) {
return that.renderString(content, {}, {
path: filename
});
});
};
// Render a page from the book
TemplateEngine.prototype.renderPage = function(page) {
var that = this, context;
return that.book.statFile(page.path)
.then(function(stat) {
context = {
// infos about the file
file: {
path: page.path,
mtime: stat.mtime
}
};
return that.renderString(page.content, context, {
path: page.path
});
});
};
module.exports = TemplateEngine;
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