Adding forceformat option: format invalid output just like jsonlint.com

When using jsonlint.com, even invalid JSON is pretty printed. It seemed
like a good option to have in the cli version as well. This is simply
inserting the char-by-char formatter from
https://github.com/umbrae/jsonlintdotcom and adding an option to cli.js.

lib/cli.js

@@ -4,6 +4,7 @@ var fs = require("fs");
 var path = require("path");
 var parser = require("./jsonlint").parser;
 var JSV = require("JSV").JSV;
+var formatter = require("./formatter.js").formatter;
 
 var options = require("nomnom")
   .script("jsonlint")
@@ -50,10 +51,16 @@ var options = require("nomnom")
         help: 'which specification of JSON Schema the validation file uses'
     },
     quiet: {
-        flag:  true,key: "value",
+        flag:  true,
+        key: "value",
         string: '-q, --quiet',
         "default": false,
-        help : 'do not print the parsed json to STDOUT'
+        help: 'do not print the parsed json to STDOUT'
+    },
+    forcePrettyPrint: {
+        flag:  true,
+        string: '-p, --pretty-print',
+        help: 'force pretty printing even if invalid'
     }
   }).parse();
 
@@ -66,10 +73,13 @@ if (options.compact) {
 }
 
 function parse (source) {
+  var parsed,
+      formatted;
+
   try {
-    var parsed = options.sort ?
-                  sortObject(parser.parse(source)) :
-                  parser.parse(source);
+    parsed = options.sort ?
+      sortObject(parser.parse(source)) :
+      parser.parse(source);
 
     if (options.validate) {
       var env = JSV.createEnvironment(options.env);
@@ -82,10 +92,31 @@ function parse (source) {
 
     return JSON.stringify(parsed,null,options.indent);
   } catch (e) {
-    if (! options.compact) {
+    if ( options.forcePrettyPrint ) {
+      /* From https://github.com/umbrae/jsonlintdotcom:
+       * If we failed to validate, run our manual formatter and then re-validate so that we
+       * can get a better line number. On a successful validate, we don't want to run our
+       * manual formatter because the automatic one is faster and probably more reliable.
+       */
+
+      try {
+        formatted = formatter.formatJson(source, options.indent);
+        // Re-parse so exception output gets better line numbers
+        parsed = parser.parse(formatted);
+      } catch (e) {
+        if (! options.compact) {
+          console.error(e);
+        }
+        return formatted;
+        process.exit(1);
+      }
+    } else {
+      if (! options.compact) {
         console.error(e);
+      }
+
+      process.exit(1);
     }
-    process.exit(1);
   }
 }