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diff --git a/lib/config/index.js b/lib/config/index.js
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+++ b/lib/config/index.js
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+var Q = require('q');
+var _ = require('lodash');
+var semver = require('semver');
+
+var gitbook = require('../gitbook');
+var configDefault = require('./default');
+
+/*
+Config is an interface for the book's configuration stored in "book.json" (or "book.js")
+*/
+
+function Config(book, baseConfig) {
+    this.book = book;
+    this.fs = book.fs;
+    this.log = book.log;
+
+    this.replace(baseConfig || {});
+}
+
+// Load configuration of the book
+// and verify that the configuration is satisfying
+Config.prototype.load = function() {
+    var that = this;
+
+    this.log.debug.ln('loading configuration');
+    return this.fs.loadAsObject(this.book.resolve('book'))
+    .fail(function(err) {
+        if (err.code != 'MODULE_NOT_FOUND') throw(err);
+        else return Q({});
+    })
+    .then(function(_config) {
+        return that.replace(_config);
+    })
+    .then(function() {
+        if (!that.book.isLanguageBook()) {
+            if (!gitbook.satisfies(that.options.gitbook)) {
+                throw new Error('GitBook version doesn\'t satisfy version required by the book: '+that.options.gitbook);
+            }
+            if (that.options.gitbook != '*' && !semver.satisfies(semver.inc(gitbook.version, 'patch'), that.options.gitbook)) {
+                that.log.warn.ln('gitbook version specified in your book.json might be too strict for future patches, \''+(_.first(gitbook.version.split('.'))+'.x.x')+'\' is more adequate');
+            }
+        }
+
+        that.options.output = that.options.output || that.book.resolve('_book');
+        //that.options.plugins = normalizePluginsList(that.options.plugins);
+        //that.options.defaultsPlugins = normalizePluginsList(that.options.defaultsPlugins || '', false);
+        //that.options.plugins = _.union(that.options.plugins, that.options.defaultsPlugins);
+        //that.options.plugins = _.uniq(that.options.plugins, 'name');
+
+        // Default value for text direction (from language)
+        /*if (!that.options.direction) {
+            var lang = i18n.getCatalog(that.options.language);
+            if (lang) that.options.direction = lang.direction;
+        }*/
+
+        that.options.gitbook = gitbook.version;
+    });
+};
+
+// Replace the whole configuration
+Config.prototype.replace = function(options) {
+    var that = this;
+
+    this.options = _.cloneDeep(configDefault);
+    this.options = _.merge(this.options, options || {});
+
+    // options.input == book.root
+    Object.defineProperty(this.options, 'input', {
+        get: function () {
+            return that.book.root;
+        }
+    });
+
+    // options.originalInput == book.parent.root
+    Object.defineProperty(this.options, 'originalInput', {
+        get: function () {
+            return that.book.parent? that.book.parent.root : undefined;
+        }
+    });
+
+    // options.originalOutput == book.parent.options.output
+    Object.defineProperty(this.options, 'originalOutput', {
+        get: function () {
+            return that.book.parent? that.book.parent.options.output : undefined;
+        }
+    });
+};
+
+// Return path to a structure file
+// Strip the extension by default
+Config.prototype.getStructure = function(name, dontStripExt) {
+    var filename = this.options.structure[name];
+    if (dontStripExt) return filename;
+
+    filename = filename.split('.').slice(0, -1).join('.');
+    return filename;
+};
+
+// Return a configuration using a key and a default value
+Config.prototype.get = function(key, def) {
+    return _.get(this.options, key, def);
+};
+
+// Update a configuration
+Config.prototype.set = function(key, value) {
+    return _.set(this.options, key, value);
+};
+
+module.exports = Config;