1 files changed, 86 insertions, 0 deletions
diff --git a/lib/configuration.js b/lib/configuration.js
index daf1b3c..8a01140 100644
--- a/lib/configuration.js
+++ b/lib/configuration.js
@@ -1,9 +1,59 @@
 var _ = require("lodash");
 var Q = require("q");
 var path = require("path");
+var npmi = require('npmi');
 
 var fs = require("./utils/fs");
 
+// Default plugins added to each books
+var defaultsPlugins = ["mathjax"];
+
+// Normalize a list of plugins to use
+function normalizePluginsList(plugins) {
+    // Normalize list to an array
+    plugins = _.isString(plugins) ? plugins.split(",") : (plugins || []);
+
+    // Divide as {name, version} to handle format like "myplugin@1.0.0"
+    plugins = _.map(plugins, function(plugin) {
+        var parts = plugin.split("@");
+        return {
+            'name': parts[0],
+            'version': parts[1] // optional
+        }
+    });
+
+    // List plugins to remove
+    var toremove = _.chain(plugins)
+    .filter(function(plugin) {
+        return plugin.name.length > 0 && plugin.name[0] == "-";
+    })
+    .map(function(plugin) {
+        return plugin.name.slice(1);
+    })
+    .value();
+
+    // Merge with defaults
+    plugins = _.chain(plugins)
+    .concat(_.map(defaultsPlugins, function(plugin) {
+        return { 'name': plugin }
+    }))
+    .uniq()
+    .value();
+
+    // Build final list
+    plugins = _.filter(plugins, function(plugin) {
+        return !_.contains(toremove, plugin.name) && !(plugin.name.length > 0 && plugin.name[0] == "-");
+    });
+
+    return plugins;
+}
+
+// Normalize a list of plugin name to use
+function normalizePluginsNames(plugins) {
+    return _.pluck(normalizePluginsList(plugins), "name");
+};
+
+
 var Configuration = function(book, options) {
 	this.book = book;
     this.options = _.cloneDeep(Configuration.DEFAULT);
@@ -29,6 +79,10 @@ Configuration.prototype.load = function() {
     })
     .then(function() {
         that.options.output = that.options.output || path.join(that.book.root, "_book");
+        that.options.plugins = normalizePluginsList(that.options.plugins);
+        that.options.defaultsPlugins = normalizePluginsList(that.options.defaultsPlugins);
+        that.options.plugins = _.union(that.options.plugins, that.options.defaultsPlugins);
+        that.options.plugins = _.uniq(that.options.plugins, "name");
     });
 };
 
@@ -37,6 +91,38 @@ Configuration.prototype.getStructure = function(name) {
     return this.options.structure[name].split(".").slice(0, -1).join(".");
 };
 
+// Install plugins
+Configuration.prototype.installPlugins = function(options) {
+    var that = this;
+    options = _.defaults(options || {
+        log: true
+    });
+
+    // Remov defaults (no need to install)
+    var plugins = _.filter(that.options.plugins, function(plugin) {
+        return !_.contains(defaultsPlugins, plugin.name);
+    });
+
+    // Install plugins one by one
+    if (options.log)  console.log(plugins.length+" plugins to install");
+    return _.reduce(plugins, function(prev, plugin) {
+        return prev.then(function() {
+            var fullname = "gitbook-plugin-"+plugin.name;
+            if (options.log) console.log("Install plugin", plugin.name, "from npm ("+fullname+") with version", (plugin.version || "*"));
+            return Q.nfcall(npmi, {
+                'name': fullname,
+                'version': plugin.version,
+                'path': that.book.root,
+                'npmLoad': {
+                    'loglevel': 'silent',
+                    'loaded': false,
+                    'prefix': that.book.root
+                }
+            });
+        });
+    }, Q());
+}
+
 // Default configuration
 Configuration.DEFAULT = {
     // Options that can't be extend