feat: Better error message + suggestion for invalid Bakelet names

#101

lib/bakelets/resolve.js

@@ -1,3 +1,4 @@
+const fs      = require('fs-extra');
 const path    = require('path');
 const Promise = require('bluebird');
 const Spinner = require('../modules/spinner');
@@ -201,7 +202,15 @@ async function resolve(vmName, bakerScriptPath, remotesPath, dir, bakelet, extra
 
     if (verbose) console.log("Found", bakeletName, version, extra_vars);
 
-    let classFoo = require(mod)
+    let classFoo = null;
+    try {
+        classFoo = require(mod);
+    } catch (error) {
+        let correctPath = (await getSupportedBakeletList(path.join(dir, '..'))).filter(bakelet => bakelet.name === info.bakeletName)[0];
+        let errorMessage = `Cannot find ${info.bakeletName} in ${path.join(info.mod, '..').split('/').pop()} Bakelets. `;
+        if (correctPath) errorMessage += `Did you mean ${correctPath.dir}:${info.bakeletName}?`
+        throw Error(errorMessage);
+    }
 
     const boxes = path.join(require('os').homedir(), '.baker');
     const ansible = path.join(boxes, 'ansible-srv');
@@ -217,3 +226,16 @@ async function resolve(vmName, bakerScriptPath, remotesPath, dir, bakelet, extra
     await Spinner.spinPromise(j.load(bakelet, extra_vars), `Preparing ${bakeletName}`, spinnerDot);
     await Spinner.spinPromise(j.install(), `Installing ${bakeletName}`, spinnerDot);
 }
+
+async function getSupportedBakeletList(bakeletsPath) {
+    let bakeletDirs = (await fs.readdir(bakeletsPath))
+    bakeletDirs = bakeletDirs.filter(dir => (fs.statSync(path.join(bakeletsPath, dir))).isDirectory());
+    let bakeletList = [];
+    for (let dir of bakeletDirs) {
+        let names = (await fs.readdir(path.join(bakeletsPath, dir))).map(dir => dir.split('.js')[0]);
+        for (let name of names) {
+            bakeletList.push({ name, dir });
+        }
+    }
+    return bakeletList;
+}