Add jsonlint formatting options to the gulp plugin options

.npmignore

@@ -0,0 +1,8 @@
+.editorconfig
+.eslintrc
+.gitignore
+.npmignore
+.travis.yml
+node_modules/
+npm-debug.log
+test/

.travis.yml

@@ -1,6 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - stable
-  - lts/*
-  - 6
+  - "12"
+  - "10"
+  - "8"
+  - "6"

README.md

@@ -1,6 +1,6 @@
 # gulp-jsonlint [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][depstat-image]][depstat-url]
 
-> jsonlint plugin for [gulp](http://gulpjs.com/)
+> [JSON]/[JSON5] file syntax validation plugin for [`gulp`] using [`jsonlint`]
 
 ## Usage
 
@@ -39,7 +39,30 @@ gulp.src('./src/*.json')
 
 ### jsonlint(options)
 
-For now, `options` are not supported yet.
+Options can be passed as keys in an object to the `jsonlint` function. The following are their defaults:
+
+    jsonlint({
+        // parsing
+        mode: 'json',
+        ignoreComments: false,
+        ignoreTrailingCommas: false,
+        allowSingleQuotedStrings: false,
+        allowDuplicateObjectKeys: true,
+        // formatting
+        format: false,
+        indent: 2,
+        sortKeys: false
+    })
+
+* `mode`, when set to "cjson" or "json5", enables some other flags automatically
+* `ignoreComments`, when `true` JavaScript-style single-line and multiple-line comments will be recognised and ignored
+* `ignoreTrailingCommas`, when `true` trailing commas in objects and arrays will be ignored
+* `allowSingleQuotedStrings`, when `true` single quotes will be accepted as alternative delimiters for strings
+* `allowDuplicateObjectKeys`, when `false` duplicate keys in objects will be reported as an error
+
+* `format`, when `true` `JSON.stringify` will be used to format the JavaScript (if it is valid)
+* `indent`, the value passed to `JSON.stringify`, it can be the number of spaces, or string like "\t"
+* `sortKeys`, when `true` keys of objects in the output JSON will be sorted alphabetically (`format` has to be set to `true` too)
 
 ### jsonlint.reporter(customReporter)
 
@@ -75,7 +98,7 @@ Stop a task/stream if an jsonlint error has been reported for any file, but wait
 
 ## License
 
-[MIT License](http://en.wikipedia.org/wiki/MIT_License)
+[MIT License]
 
 [npm-url]: https://npmjs.org/package/gulp-jsonlint
 [npm-image]: https://badge.fury.io/js/gulp-jsonlint.svg
@@ -85,3 +108,9 @@ Stop a task/stream if an jsonlint error has been reported for any file, but wait
 
 [depstat-url]: https://david-dm.org/rogeriopvl/gulp-jsonlint
 [depstat-image]: https://david-dm.org/rogeriopvl/gulp-jsonlint.svg
+
+[MIT License]: http://en.wikipedia.org/wiki/MIT_License
+[`gulp`]: http://gulpjs.com/
+[`jsonlint`]: https://prantlf.github.io/jsonlint/
+[JSON]: https://tools.ietf.org/html/rfc8259
+[JSON5]: https://spec.json5.org

index.js

@@ -2,7 +2,8 @@
 
 var mapStream = require('map-stream')
 var colors = require('ansi-colors')
-var jsonlint = require('jsonlint')
+var jsonlint = require('@prantlf/jsonlint')
+var sorter = require('@prantlf/jsonlint/lib/sorter')
 var through = require('through2')
 var PluginError = require('plugin-error')
 var log = require('fancy-log')
@@ -20,13 +21,50 @@ var formatOutput = function(msg) {
 }
 
 var jsonLintPlugin = function(options) {
-  options = options || {}
+  options = Object.assign(
+    {
+      mode: 'json',
+      ignoreComments: false,
+      ignoreTrailingCommas: false,
+      allowSingleQuotedStrings: false,
+      allowDuplicateObjectKeys: true,
+      format: false,
+      indent: 2,
+      sortKeys: false
+    },
+    options
+  )
 
   return mapStream(function(file, cb) {
     var errorMessage = ''
 
+    var parserOptions = {
+      mode: options.mode,
+      ignoreComments:
+        options.ignoreComments ||
+        options.cjson ||
+        options.mode === 'cjson' ||
+        options.mode === 'json5',
+      ignoreTrailingCommas:
+        options.ignoreTrailingCommas || options.mode === 'json5',
+      allowSingleQuotedStrings:
+        options.allowSingleQuotedStrings || options.mode === 'json5',
+      allowDuplicateObjectKeys: options.allowDuplicateObjectKeys,
+      limitedErrorInfo: !(
+        options.ignoreComments ||
+        options.cjson ||
+        options.allowSingleQuotedStrings
+      )
+    }
     try {
-      jsonlint.parse(String(file.contents))
+      var parsedData = jsonlint.parse(String(file.contents), parserOptions)
+      if (options.format) {
+        if (options.sortKeys) {
+          parsedData = sorter.sortObject(parsedData)
+        }
+        var formatted = JSON.stringify(parsedData, null, options.indent) + '\n'
+        file.contents = new Buffer(formatted)
+      }
     } catch (err) {
       errorMessage = err.message
     }