1 files changed, 81 insertions, 0 deletions
diff --git a/packages/gitbook/src/plugins/findInstalled.js b/packages/gitbook/src/plugins/findInstalled.js
new file mode 100644
index 0000000..fb690c2
--- /dev/null
+++ b/packages/gitbook/src/plugins/findInstalled.js
@@ -0,0 +1,81 @@
+const { OrderedMap } = require('immutable');
+const path = require('path');
+
+const Promise = require('../utils/promise');
+const fs = require('../utils/fs');
+const Plugin = require('../models/plugin');
+const PREFIX = require('../constants/pluginPrefix');
+
+/**
+ * Validate if a package name is a GitBook plugin
+ *
+ * @return {Boolean}
+ */
+function validateId(name) {
+    return name && name.indexOf(PREFIX) === 0;
+}
+
+/**
+ * Read details about a node module.
+ * @param {String} modulePath
+ * @param {Number} depth
+ * @param {String} parent
+ * @return {Plugin} plugin
+ */
+function readModule(modulePath, depth, parent) {
+    const pkg = require(path.join(modulePath, 'package.json'));
+    const pluginName = pkg.name.slice(PREFIX.length);
+
+    return new Plugin({
+        name: pluginName,
+        version: pkg.version,
+        path: modulePath,
+        depth,
+        parent
+    });
+}
+
+/**
+ * List all packages installed inside a folder
+ *
+ * @param {String} folder
+ * @param {Number} depth
+ * @param {String} parent
+ * @return {Promise<OrderedMap<String:Plugin>>} plugins
+ */
+function findInstalled(folder, depth = 0, parent = null) {
+    // When tetsing with mock-fs
+    if (!folder) {
+        return Promise(OrderedMap());
+    }
+
+    // Search for gitbook-plugins in node_modules folder
+    const node_modules = path.join(folder, 'node_modules');
+
+    // List all folders in node_modules
+    return fs.readdir(node_modules)
+    .fail(() => {
+        return Promise([]);
+    })
+    .then((modules) => {
+        return Promise.reduce(modules, (results, moduleName) => {
+            // Not a gitbook-plugin
+            if (!validateId(moduleName)) {
+                return results;
+            }
+
+            // Read gitbook-plugin package details
+            const moduleFolder = path.join(node_modules, moduleName);
+            const plugin = readModule(moduleFolder, depth, parent);
+
+            results = results.set(plugin.getName(), plugin);
+
+            return findInstalled(moduleFolder, depth + 1, plugin.getName())
+            .then((innerModules) => {
+                return results.merge(innerModules);
+            });
+        }, OrderedMap());
+    });
+}
+
+module.exports = findInstalled;