improved input filePath handling

Author: ShMcK

README.md

@@ -1,3 +1,3 @@
-# Coderoad Builder
+# CodeRoad Builder
 
-Transform markdown tutorials into cr.JSON format.
+Transform markdown tutorials into `coderoad.json` format.

package.json

@@ -8,7 +8,7 @@
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "node ./src/build.js coderoad.json ./src/README.md"
+    "start": "node ./src/build.js coderoad.json"
   },
   "author": "Shawn McKay <shawn.j.mckay@gmail.com>",
   "license": "ISC"

src/build.js

@@ -214,14 +214,17 @@ function isValidJSON(text) {
         return false;
     }
 }
-console.log(process.argv);
 var output = process.argv[2];
 if (!output) {
     throw ('Pass in path to output cr.json file');
 }
 var input = process.argv[3];
 if (!input) {
-    throw ('Pass in path to .md file');
+    input = './README.md';
+    console.log(`
+    Pass in a path to your .md file, otherwise it defaults to README.md
+    For example: npm start ./src/source.md
+    `);
 }
 var result = cleanup(build(input));
 if (!isValidJSON(result)) {

src/build.ts

@@ -1,5 +1,4 @@
 import * as fs from 'fs';
-// JSON.stringify
 
 function line(char: string, times: number) {
   return new RegExp('^' + char + '{' + times + '}(?!#)(.*?)$', 'gm');
@@ -14,7 +13,6 @@ var regex = {
   '```': line('`', 3)
 };
 
-
 function isEmpty(line: string): boolean {
   return !line.length || !!line.match(/^\s+?[\n\r]/);
 }
@@ -264,16 +262,18 @@ function isValidJSON(text: string) {
   }
 }
 
-console.log(process.argv);
-
 var output = process.argv[2];
 if (!output) {
   throw ('Pass in path to output cr.json file');
 }
 
 var input = process.argv[3];
 if (!input) {
-  throw ('Pass in path to .md file');
+  input = './README.md';
+  console.log(`
+    Pass in a path to your .md file, otherwise it defaults to README.md
+    For example: npm start ./src/source.md
+    `);
 }
 
 // Build