New: Add vue/max-len rule

docs/rules/README.md

@@ -153,6 +153,7 @@ For example:
 | [vue/key-spacing](./key-spacing.md) | enforce consistent spacing between keys and values in object literal properties | :wrench: |
 | [vue/keyword-spacing](./keyword-spacing.md) | enforce consistent spacing before and after keywords | :wrench: |
 | [vue/match-component-file-name](./match-component-file-name.md) | require component name property to match its file name |  |
+| [vue/max-len](./max-len.md) | enforce a maximum line length |  |
 | [vue/no-boolean-default](./no-boolean-default.md) | disallow boolean defaults | :wrench: |
 | [vue/no-deprecated-scope-attribute](./no-deprecated-scope-attribute.md) | disallow deprecated `scope` attribute (in Vue.js 2.5.0+) | :wrench: |
 | [vue/no-deprecated-slot-attribute](./no-deprecated-slot-attribute.md) | disallow deprecated `slot` attribute (in Vue.js 2.6.0+) | :wrench: |

docs/rules/max-len.md

@@ -0,0 +1,329 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/max-len
+description: enforce a maximum line length
+---
+# vue/max-len
+> enforce a maximum line length
+
+## :book: Rule Details
+
+This rule enforces a maximum line length to increase code readability and maintainability.
+This rule is the similar rule as core [max-len] rule but it applies to the source code in `.vue`.
+
+<eslint-code-block :rules="{'vue/max-len': ['error']}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+    sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+  </div>
+
+  <!-- ✗ BAD -->
+  <div>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </div>
+  <div>
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+  </div>
+</template>
+
+<script>
+/* ✓ GOOD */
+var foo = {
+  "bar": "This is a bar.",
+  "baz": { "qux": "This is a qux" },
+  "easier": "to read"
+};
+
+/* ✗ BAD */
+var foo = { "bar": "This is a bar.", "baz": { "qux": "This is a qux" }, "difficult": "to read" };
+</script>
+
+<style>
+/* ignore */
+.ignore-stylesheet .blocks-other-than-script-and-template-are-ignored .this-line-has-a-length-of-100
+{}
+</style>
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+```js
+{
+    "vue/max-len": ["error", {
+        "code": 80,
+        "template": 80,
+        "tabWidth": 2,
+        "comments": 80,
+        "ignorePattern": "",
+        "ignoreComments": false,
+        "ignoreTrailingComments": false,
+        "ignoreUrls": false,
+        "ignoreStrings": false,
+        "ignoreTemplateLiterals": false,
+        "ignoreRegExpLiterals": false,
+        "ignoreHTMLAttributeValues": false,
+        "ignoreHTMLTextContents": false,
+    }]
+}
+```
+
+- `code` ... enforces a maximum line length. default `80`
+- `template` ... enforces a maximum line length for `<template>`. defaults to value of `code`
+- `tabWidth` ... specifies the character width for tab characters. default `2`
+- `comments` ... enforces a maximum line length for comments. defaults to value of `code`
+- `ignorePattern` ... ignores lines matching a regular expression. can only match a single line and need to be double escaped when written in YAML or JSON
+- `ignoreComments` ... if `true`, ignores all trailing comments and comments on their own line. default `false`
+- `ignoreTrailingComments` ... if `true`, ignores only trailing comments. default `false`
+- `ignoreUrls` ... if `true`, ignores lines that contain a URL. default `false`
+- `ignoreStrings` ... if `true`, ignores lines that contain a double-quoted or single-quoted string. default `false`
+- `ignoreTemplateLiterals` ... if `true`, ignores lines that contain a template literal. default `false`
+- `ignoreRegExpLiterals` ... if `true`, ignores lines that contain a RegExp literal. default `false`
+- `ignoreHTMLAttributeValues` ... if `true`, ignores lines that contain a HTML attribute value. default `false`
+- `ignoreHTMLTextContents` ... if `true`, ignores lines that contain a HTML text content. default `false`
+
+### `"code": 40`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {code: 40}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>line length is 40 ........ </div>
+
+  <!-- ✗ BAD -->
+  <div>line length is 50 .................. </div>
+</template>
+
+<script>
+/* ✓ GOOD */
+var foo = ['line', 'length', 'is', '40']
+
+/* ✗ BAD */
+var foo = ['line', 'length', 'is', '50', '......']
+</script>
+```
+
+</eslint-code-block>
+
+
+### `"template": 120`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {template: 120}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>line length is 120 ....................................................................................... </div>
+
+  <!-- ✗ BAD -->
+  <div>line length is 121 ........................................................................................ </div>
+</template>
+
+<script>
+/* ✗ BAD */
+var foo = ['line', 'length', 'is', '81', '......', '......', '......', '......'];
+</script>
+```
+
+</eslint-code-block>
+
+### `"comments": 65`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {comments: 65}]}">
+
+```vue
+<template>
+<!-- ✓ GOOD -->
+<!--
+  This is a comment that does not violates
+  the maximum line length we have specified
+-->
+
+<!-- ✗ BAD -->
+<!--
+  This is a comment that violates the maximum line length we have specified
+-->
+</template>
+
+<script>
+/* ✓ GOOD */
+/**
+ * This is a comment that does not violates
+ * the maximum line length we have specified
+ */
+
+/* ✗ BAD */
+/**
+ * This is a comment that violates the maximum line length we have specified
+ */
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreComments": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreComments: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <!-- This is a really really really really really really really really really long comment -->
+</template>
+
+<script>
+/* ✓ GOOD */
+/**
+ * This is a really really really really really really really really really long comment
+ */
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreTrailingComments": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreTrailingComments: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div /><!-- This is a really really really really really really really really long comment -->
+
+  <!-- ✗ BAD -->
+  <!-- This is a really really really really really really really really long comment -->
+</template>
+
+<script>
+/* ✓ GOOD */
+var foo = 'bar'; // This is a really really really really really really really really long comment
+
+/* ✗ BAD */
+// This is a really really really really really really really really long comment
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreUrls": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreUrls: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div style="background-image: url('https://www.example.com/really/really/really/really/really/really/really/long')" />
+</template>
+
+<script>
+/* ✓ GOOD */
+var url = 'https://www.example.com/really/really/really/really/really/really/really/long';
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreStrings": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreStrings: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div :title="'this is a really really really really really really long string!'" />
+
+  <!-- ✗ BAD -->
+  <div title="this is a really really really really really really long attribute value!" />
+  <div>this is a really really really really really really really long text content!</div>
+</template>
+
+<script>
+/* ✓ GOOD */
+var longString = 'this is a really really really really really really long string!';
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreTemplateLiterals": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreTemplateLiterals: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div :title="`this is a really really really really really long template literal!`" />
+</template>
+
+<script>
+/* ✓ GOOD */
+var longTemplateLiteral = `this is a really really really really really long template literal!`;
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreRegExpLiterals": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreRegExpLiterals: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div :class="{
+    foo: /this is a really really really really really long regular expression!/.test(bar)
+  }" />
+</template>
+
+<script>
+/* ✓ GOOD */
+var longRegExpLiteral = /this is a really really really really really long regular expression!/;
+</script>
+```
+
+</eslint-code-block>
+
+### `"ignoreHTMLAttributeValues": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreHTMLAttributeValues: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div title="this is a really really really really really really long attribute value!" />
+
+  <!-- ✗ BAD -->
+  <div :title="'this is a really really really really really really long string!'" />
+</template>
+```
+
+</eslint-code-block>
+
+### `"ignoreHTMLTextContents": true`
+
+<eslint-code-block :rules="{'vue/max-len': ['error', {ignoreHTMLTextContents: true}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>this is a really really really really really really really long text content!</div>
+</template>
+```
+
+</eslint-code-block>
+
+## :books: Further reading
+
+- [max-len]
+
+[max-len]: https://eslint.org/docs/rules/max-len
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/max-len.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/max-len.js)

lib/configs/no-layout-rules.js

@@ -19,6 +19,7 @@ module.exports = {
     'vue/key-spacing': 'off',
     'vue/keyword-spacing': 'off',
     'vue/max-attributes-per-line': 'off',
+    'vue/max-len': 'off',
     'vue/multiline-html-element-content-newline': 'off',
     'vue/mustache-interpolation-spacing': 'off',
     'vue/no-multi-spaces': 'off',

lib/index.js

@@ -32,6 +32,7 @@ module.exports = {
     'keyword-spacing': require('./rules/keyword-spacing'),
     'match-component-file-name': require('./rules/match-component-file-name'),
     'max-attributes-per-line': require('./rules/max-attributes-per-line'),
+    'max-len': require('./rules/max-len'),
     'multiline-html-element-content-newline': require('./rules/multiline-html-element-content-newline'),
     'mustache-interpolation-spacing': require('./rules/mustache-interpolation-spacing'),
     'name-property-casing': require('./rules/name-property-casing'),