add -n/--insert-final-newline option

Author: yassh

lib/cli.js

@@ -36,6 +36,11 @@ var options = require("nomnom")
       "default": "  ",
       help: 'character(s) to use for indentation'
     },
+    insertFinalNewline : {
+      flag : true,
+      string: '-n, --insert-final-newline',
+      help: 'ensure JSON string ends with a newline'
+    },
     compact : {
         flag : true,
         string: '-c, --compact',
@@ -90,7 +95,7 @@ function parse (source) {
       }
     }
 
-    return JSON.stringify(parsed, null, options.indent);
+    return JSON.stringify(parsed, null, options.indent) + (options.insertFinalNewline ? "\n" : "");
   } catch (e) {
     if (options.forcePrettyPrint) {
       /* From https://github.com/umbrae/jsonlintdotcom:
@@ -100,7 +105,7 @@ function parse (source) {
        */
 
       try {
-        formatted = formatter.formatJson(source, options.indent);
+        formatted = formatter.formatJson(source, options.indent, options.insertFinalNewline);
         // Re-parse so exception output gets better line numbers
         parsed = parser.parse(formatted);
       } catch (e) {

lib/formatter.js

@@ -16,7 +16,7 @@ var formatter = (function () {
         return new Array(count + 1).join(s);
     }
 
-    function formatJson(json, indentChars) {
+    function formatJson(json, indentChars, insertFinalNewline) {
         var i           = 0,
             il          = 0,
             tab         = (typeof indentChars !== "undefined") ? indentChars : "    ",
@@ -80,6 +80,8 @@ var formatter = (function () {
             } 
         } 
 
+        if (insertFinalNewline) newJson += "\n";
+
         return newJson; 
     }