allow inline prettier config

Author: patricklx

README.md

@@ -48,6 +48,24 @@ module.exports = {
 
 The recommended set will apply [these rules](https://github.com/ember-template-lint/ember-template-lint-plugin-prettier/blob/v1.1.0-beta.0/lib/config/recommended.js).
 
+## Configure Prettier Options
+
+Prettier can be configured via [standard prettier config files](https://prettier.io/docs/en/configuration.html), or rule config options.
+The configuration from the rule will be merged with the rc file config, overriding existing options.
+e.g
+
+```js
+module.exports = {
+  plugins: ["ember-template-lint-plugin-prettier"],
+
+  extends: ["recommended", "ember-template-lint-plugin-prettier:recommended"],
+  
+  rules: {
+    "prettier": { singleQuote: true }
+  }
+};
+```
+
 ## Tips
 
 You may want to define these two scripts in your package.json:

lib/rules/prettier.js

@@ -19,6 +19,11 @@ export default class Prettier extends Rule {
   constructor(options) {
     super(options);
     this.filePath = options.filePath;
+    let config = options.config;
+    if (Array.isArray(config)) {
+      config = config[0];
+    }
+    this.prettierConfig = typeof config !== "object" ? {} : config;
   }
 
   visitor() {
@@ -60,6 +65,7 @@ export default class Prettier extends Rule {
             {},
             { parser: "glimmer" },
             prettierRcOptions,
+            this.prettierConfig,
             {
               filepath,
             }

test/unit/rules/lint-prettier-test.js

@@ -8,6 +8,7 @@ generateRuleTests({
   groupingMethod: describe,
   testMethod: it,
   plugins: [plugin],
+  config: true,
 
   good: [
     ``,
@@ -27,7 +28,6 @@ test
 
   bad: [
     {
-      config: true,
       template: "{{#my-component}}{{/my-component}}\n",
       fixedTemplate: "{{#my-component}}{{/my-component}}",
       result: {
@@ -41,15 +41,17 @@ test
       },
     },
     {
-      config: true,
+      config: {
+        singleQuote: true,
+      },
       template: `<div data-foo
  data-bar="lol"
       some-other-thing={{haha-morethaneightychars}}>
 </div>`,
-      fixedTemplate: `<div data-foo data-bar="lol" some-other-thing={{haha-morethaneightychars}}>
+      fixedTemplate: `<div data-foo data-bar='lol' some-other-thing={{haha-morethaneightychars}}>
 </div>`,
       result: {
-        message: 'Replace `⏎·data-bar="lol"⏎·····` with `·data-bar="lol"`',
+        message: "Replace `⏎·data-bar=\"lol\"⏎·····` with `·data-bar='lol'`",
         line: 1,
         column: 13,
         endLine: 3,
@@ -62,7 +64,6 @@ test
       },
     },
     {
-      config: true,
       template: "test\n",
       fixedTemplate: "test",
       result: {
@@ -76,7 +77,6 @@ test
       },
     },
     {
-      config: true,
       template: `{{#my-component}}
 
 test
@@ -98,7 +98,6 @@ test
       },
     },
     {
-      config: true,
       template: `{{#my-component class="class1 class2"}}
   test