Fix file when option is passed

Save the formatted JSON on the file that it came from.

Signed-off-by: Airton Zanon <me@airton.dev>

README.md

@@ -13,13 +13,18 @@ Verify if the code style is fine:
 
     ./node_modules/.bin/jsoncs my/file.json
 
+Fix the code style of a file:
+
+    ./node_modules/.bin/jsoncs --fix my/file.json
+
 ### Options 
 
     $ jsoncs -h
 
     Usage: jsoncs [file]
 
     Options:
+       -f, --fix                Fix the file
        -v, --version            print version and exit
 
 ### Example
@@ -31,6 +36,5 @@ Verify if the code style is fine:
 
 ## TO-DO
 
-* Fix the errors found by the JSONCS
-* Make it multiple files
-* Leave the code style to the user
+* Make it accept multiple files
+* Leave the code style to the user in a config file

lib/cli.js

@@ -15,37 +15,52 @@ program.
   version(packageVersion,
     "-v, --version",
     "json code style version")
+  .option("-f, --fix",
+    "fix json file")
   .arguments("[json]")
   .action(function (json) {
     jsonFile = json;
   });
 
 program.parse(process.argv);
 
-function parse(source) {
+function parse(filePath) {
+  let source = fs.readFileSync(filePath, "utf8");
+
   let formatted = formatter.formatJson(source);
   let diff = jsdiff.diffJson(source, formatted);
-  let hasChanges = false;
+  let hasErrors = false;
 
   diff.forEach((part) => {
     let color = part.added ? "\x1b[34m" : part.removed ? "\x1b[31m" : "\x1b[37m";
 
     if (part.added || part.removed) {
       console.log(color, part.value);
-      hasChanges = true;
+      hasErrors = true;
     }
   });
 
-  if (hasChanges) {
+  if (program.fix) {
+    fs.writeFile(filePath, formatted, (err) => {
+      if (err) {
+        process.exit(1);
+      }
+    });
+
+    console.log(filePath + ' - has been fixed');
+    hasErrors = false;
+  }
+
+  if (hasErrors) {
     process.exit(1);
   }
 
   process.exit(0);
 }
 
-function main(args) {
-  let json = path.normalize(args);
-  parse(fs.readFileSync(json, "utf8"));
+function main(jsonFilePath) {
+  let filePath = path.normalize(jsonFilePath);
+  parse(filePath);
 }
 
 main(jsonFile);

package.json

@@ -8,7 +8,7 @@
     "code",
     "style"
   ],
-  "version": "0.0.2",
+  "version": "0.1.0",
   "preferGlobal": true,
   "repository": {
     "type": "git",