fix: enhance user errors to point to snyk docs

lib/detect.js

@@ -6,6 +6,7 @@ module.exports = {
 var fs = require('then-fs');
 var path = require('path');
 var debug = require('debug')('snyk');
+var chalk = require('chalk');
 
 var DETECTABLE_FILES = [
   'yarn.lock',
@@ -76,7 +77,13 @@ function detectPackageManager(root, options) {
     packageManager = detectPackageManagerFromRegistry(registry);
   }
   if (!packageManager) {
-    throw new Error('Could not autodetect package manager for ' + root);
+    throw new Error('Could not detect supported target files in ' + root +
+    '.\nPlease see our documentation for supported languages and ' +
+    'target files: ' +
+    chalk.underline(
+      'https://support.snyk.io/getting-started/languages-support'
+    ) +
+    ' and make sure you are in the right directory.');
   }
   return packageManager;
 }

lib/protect/ensure-patch.js

@@ -2,15 +2,23 @@ module.exports = ensurePatchExists;
 
 var hasbin = require('hasbin');
 var analytics = require('../analytics');
+var chalk = require('chalk');
 
 function ensurePatchExists() {
   return new Promise(function (resolve, reject) {
     return hasbin('patch', function (exists) {
       if (!exists) {
-        var err = new Error('Snyk couldn\'t patch the specified ' +
-                            'vulnerabilities because GNU\'s patch is not ' +
-                            'available. Please install \'patch\' ' +
-                            'and try again.');
+        var err =
+        new Error(
+          'Snyk couldn\'t patch the specified ' +
+          'vulnerabilities because GNU\'s patch is not ' +
+          'available. Please install \'patch\' ' +
+          'and try again. \n For more information ' +
+          'please see our support page: '
+          + chalk.underline(
+            'https://support.snyk.io' +
+            '/snyk-cli/snyk-protect-requires-the-patch-binary.'
+          ));
         analytics.add('patch-binary-missing', {
           message: err.message,
         });

lib/snyk-test/index.js

@@ -2,6 +2,7 @@ module.exports = test;
 
 var detect = require('../detect');
 var runTest = require('./run-test');
+var chalk = require('chalk');
 
 function test(root, options, callback) {
   if (typeof options === 'function') {
@@ -33,7 +34,7 @@ function executeTest(root, options) {
       return res;
     });
   } catch (error) {
-    return Promise.reject(error);
+    return Promise.reject(chalk.red.bold(error));
   }
 }