Add mustache-curly-spacing rule.

docs/rules/mustache-interpolation-spacing.md

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+# enforce unified spacing in mustache interpolations. (mustache-interpolation-spacing)
+
+- :wrench: The `--fix` option on the [command line](http://eslint.org/docs/user-guide/command-line-interface#fix) can automatically fix some of the problems reported by this rule.
+
+## :book: Rule Details
+
+This rule aims to enforce unified spacing in mustache interpolations.
+
+:-1: Examples of **incorrect** code for this rule:
+
+```html
+<template>
+  <div>{{   text   }}</div>
+</template>
+```
+
+:+1: Examples of **correct** code for this rule:
+
+```html
+<template>
+  <div>{{ text }}</div>
+</template>
+```
+
+## :wrench: Options
+
+Default spacing is set to `always`
+
+```
+'vue/mustache-interpolation-spacing': [2, 'always'|'never']
+```
+
+### `"always"` - Expect one space between expression and curly brackets.
+
+:+1: Examples of **correct** code`:
+
+```html
+<template>
+  <div>{{ text }}</div>
+</template>
+```
+
+:-1: Examples of **incorrect** code`:
+
+```html
+<template>
+  <div>{{text}}</div>
+</template>
+```
+
+### `"never"` - Expect no spaces between expression and curly brackets.
+
+:+1: Examples of **correct** code`:
+
+```html
+<template>
+  <div>{{text}}</div>
+</template>
+```
+
+:-1: Examples of **incorrect** code`:
+
+```html
+<template>
+  <div>{{ text }}</div>
+</template>
+```

lib/rules/mustache-interpolation-spacing.js

@@ -0,0 +1,91 @@
+/**
+ * @fileoverview enforce unified spacing in mustache interpolations.
+ * @author Armano
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'enforce unified spacing in mustache interpolations.',
+      category: 'Stylistic Issues',
+      recommended: false
+    },
+    fixable: 'whitespace',
+    schema: [
+      {
+        enum: ['always', 'never']
+      }
+    ]
+  },
+
+  create (context) {
+    const options = context.options[0]
+    const optSpaces = options !== 'never'
+    const template = context.parserServices.getTemplateBodyTokenStore && context.parserServices.getTemplateBodyTokenStore()
+
+    // ----------------------------------------------------------------------
+    // Helpers
+    // ----------------------------------------------------------------------
+
+    function checkTokens (leftToken, rightToken) {
+      if (leftToken.loc.end.line === rightToken.loc.start.line) {
+        const spaces = rightToken.loc.start.column - leftToken.loc.end.column
+        const noSpacesFound = spaces === 0
+
+        if (optSpaces === noSpacesFound) {
+          context.report({
+            node: rightToken,
+            loc: {
+              start: leftToken.loc.end,
+              end: rightToken.loc.start
+            },
+            message: 'Found {{spaces}} whitespaces, {{type}} expected.',
+            data: {
+              spaces: spaces === 0 ? 'none' : spaces,
+              type: optSpaces ? '1' : 'none'
+            },
+            fix: (fixer) => fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], optSpaces ? ' ' : '')
+          })
+        }
+      }
+    }
+
+    // ----------------------------------------------------------------------
+    // Public
+    // ----------------------------------------------------------------------
+
+    utils.registerTemplateBodyVisitor(context, {
+      'VExpressionContainer[expression!=null]' (node) {
+        const tokens = template.getTokens(node, {
+          includeComments: true,
+          filter: token => token.type !== 'HTMLWhitespace' // When there is only whitespace between ignore it
+        })
+
+        const startToken = tokens.shift()
+        if (!startToken || startToken.type !== 'VExpressionStart') return
+        const endToken = tokens.pop()
+        if (!endToken || endToken.type !== 'VExpressionEnd') return
+
+        if (tokens.length > 0) {
+          checkTokens(startToken, tokens[0])
+          checkTokens(tokens[tokens.length - 1], endToken)
+        } else {
+          checkTokens(startToken, endToken)
+        }
+      }
+    })
+
+    return { }
+  }
+}

tests/lib/rules/mustache-interpolation-spacing.js

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+/**
+ * @fileoverview enforce unified spacing in mustache interpolations.
+ * @author Armano
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const rule = require('../../../lib/rules/mustache-interpolation-spacing')
+const RuleTester = require('eslint').RuleTester
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+const ruleTester = new RuleTester({
+  parser: 'vue-eslint-parser',
+  parserOptions: { ecmaVersion: 2015 }
+})
+
+ruleTester.run('mustache-interpolation-spacing', rule, {
+
+  valid: [
+    {
+      filename: 'test.vue',
+      code: '<template></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div></div></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template>             <div id="               "></div>         </template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template> <div :style="  " :class="       foo      " v-if=foo   ></div>      </template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ text }}</div></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ }}</div></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ }}</div></template>',
+      options: ['always']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{}}</div></template>',
+      options: ['never']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{text}}</div></template>',
+      options: ['never']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ text }}</div></template>',
+      options: ['always']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{         }}</div></template>',
+      options: ['always']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{         }}</div></template>',
+      options: ['never']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{   text   }}</div></template>',
+      options: ['always']
+    }
+  ],
+
+  invalid: [
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ text}}</div></template>',
+      output: '<template><div>{{ text }}</div></template>',
+      options: ['always'],
+      errors: [{
+        message: 'Found none whitespaces, 1 expected.',
+        type: 'VExpressionEnd'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{text }}</div></template>',
+      output: '<template><div>{{ text }}</div></template>',
+      options: ['always'],
+      errors: [{
+        message: 'Found none whitespaces, 1 expected.',
+        type: 'Identifier'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ text}}</div></template>',
+      output: '<template><div>{{text}}</div></template>',
+      options: ['never'],
+      errors: [{
+        message: 'Found 1 whitespaces, none expected.',
+        type: 'Identifier'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{text }}</div></template>',
+      output: '<template><div>{{text}}</div></template>',
+      options: ['never'],
+      errors: [{
+        message: 'Found 1 whitespaces, none expected.',
+        type: 'VExpressionEnd'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{text}}</div></template>',
+      output: '<template><div>{{ text }}</div></template>',
+      options: ['always'],
+      errors: [{
+        message: 'Found none whitespaces, 1 expected.',
+        type: 'Identifier'
+      }, {
+        message: 'Found none whitespaces, 1 expected.',
+        type: 'VExpressionEnd'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{ text }}</div></template>',
+      output: '<template><div>{{text}}</div></template>',
+      options: ['never'],
+      errors: [{
+        message: 'Found 1 whitespaces, none expected.',
+        type: 'Identifier'
+      }, {
+        message: 'Found 1 whitespaces, none expected.',
+        type: 'VExpressionEnd'
+      }]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div>{{   text   }}</div></template>',
+      output: '<template><div>{{text}}</div></template>',
+      options: ['never'],
+      errors: [{
+        message: 'Found 3 whitespaces, none expected.',
+        type: 'Identifier'
+      }, {
+        message: 'Found 3 whitespaces, none expected.',
+        type: 'VExpressionEnd'
+      }]
+    }
+  ]
+})