1 files changed, 84 insertions, 0 deletions
diff --git a/lib/pluginslist.js b/lib/pluginslist.js
index 10e21ac..b4b601e 100644
--- a/lib/pluginslist.js
+++ b/lib/pluginslist.js
@@ -1,7 +1,16 @@
 var _ = require("lodash");
 var Q = require("q");
+var npmi = require('npmi');
+var npm = require('npm');
+var semver = require('semver');
 
 var Plugin = require("./plugin");
+var pkg = require("../package.json");
+
+var initNPM = _.memoize(function() {
+	return Q.nfcall(npm.load, { silent: true, loglevel: 'silent' });
+});
+
 
 var PluginsList = function(book, plugins) {
 	this.book = book;
@@ -138,4 +147,79 @@ PluginsList.prototype.resources = function(namespace) {
 	return this.namespaces[namespace].resources;
 };
 
+// Install plugins from a book
+PluginsList.prototype.install = function() {
+	var that = this;
+	var defaultsPlugins = _.pluck(that.book.options.defaultsPlugins)
+
+    // Remove defaults (no need to install)
+    var plugins = _.filter(that.book.options.plugins, function(plugin) {
+        return !_.contains(defaultsPlugins, plugin.name);
+    });
+
+    // Install plugins one by one
+    that.book.log.info.ln(plugins.length+" plugins to install");
+    return _.reduce(plugins, function(prev, plugin) {
+        return prev.then(function() {
+            var fullname = "gitbook-plugin-"+plugin.name;
+
+            return Q()
+
+            // Resolve version if needed
+            .then(function() {
+            	if (plugin.version) return plugin.version;
+
+            	that.book.log.info.ln("No version specified, resolve plugin", plugin.name);
+            	return initNPM()
+            	.then(function() {
+            		return Q.nfcall(npm.commands.view, [fullname+"@>=0.0.0", "engines"], true);
+            	})
+            	.then(function(versions) {
+            		return _.chain(versions)
+            			.pairs()
+            			.map(function(v) {
+            				return {
+            					version: v[0],
+            					gitbook: (v[1].engines || {})["gitbook"]
+            				}
+            			})
+            			.filter(function(v) {
+            				return v.gitbook && semver.satisfies(pkg.version, v.gitbook);
+            			})
+            			.sort(function(v1, v2) {
+            				return semver.lt(v1.version, v2.version)? 1 : -1;
+            			})
+            			.pluck("version")
+            			.first()
+            			.value();
+            	});
+            })
+
+            // Install the plugin with the resolved version
+            .then(function(version) {
+            	if (!version) {
+            		throw "Found no satisfactory version for plugin "+plugin.name;
+            	}
+
+            	that.book.log.info.ln("install plugin", plugin.name, "from npm ("+fullname+") with version", version);
+	            return Q.nfcall(npmi, {
+	                'name': fullname,
+	                'version': version,
+	                'path': that.book.root,
+	                'npmLoad': {
+	                    'loglevel': 'silent',
+	                    'loaded': true,
+	                    'prefix': that.book.root
+	                }
+	            });
+            })
+            .then(function() {
+                that.book.log.info.ok("plugin", plugin.name, "installed with success");
+            });
+        });
+    }, Q());
+};
+
+
+
 module.exports = PluginsList;