bring in filenames to github rules

Author: gracepark

lib/rules/filenames-match-regex.js

@@ -0,0 +1,49 @@
+const path = require('path')
+const parseFilename = require('../utils/parse-filename')
+const getExportedName = require('../utils/get-exported-name')
+const isIgnoredFilename = require('../utils/is-ignored-filename')
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'ensure filenames match a regex naming convention',
+      url: require('../url')(module),
+    },
+    schema: {
+      type: 'array',
+      minItems: 1,
+      maxItems: 2,
+      items: [
+        {
+          type: 'string',
+        },
+      ],
+    },
+  },
+
+  create(context) {
+    const defaultRegexp = /^([a-z0-9]+)([A-Z][a-z0-9]+)*$/g
+    const conventionRegexp = context.options[0] ? new RegExp(context.options[0]) : defaultRegexp
+    const ignoreExporting = context.options[1] ? context.options[1] : false
+
+    return {
+      Program(node) {
+        const filename = context.getFilename()
+        const absoluteFilename = path.resolve(filename)
+        const parsed = parseFilename(absoluteFilename)
+        const shouldIgnore = isIgnoredFilename(filename)
+        const isExporting = Boolean(getExportedName(node))
+        const matchesRegex = conventionRegexp.test(parsed.name)
+
+        if (shouldIgnore) return
+        if (ignoreExporting && isExporting) return
+        if (!matchesRegex) {
+          context.report(node, "Filename '{{name}}' does not match the regex naming convention.", {
+            name: parsed.base,
+          })
+        }
+      },
+    }
+  },
+}

lib/utils/get-exported-name.js

@@ -0,0 +1,37 @@
+function getNodeName(node, options) {
+  const op = options || []
+
+  if (node.type === 'Identifier') {
+    return node.name
+  }
+
+  if (node.id && node.id.type === 'Identifier') {
+    return node.id.name
+  }
+
+  if (op[2] && node.type === 'CallExpression' && node.callee.type === 'Identifier') {
+    return node.callee.name
+  }
+}
+
+module.exports = function getExportedName(programNode, options) {
+  for (let i = 0; i < programNode.body.length; i += 1) {
+    const node = programNode.body[i]
+
+    if (node.type === 'ExportDefaultDeclaration') {
+      return getNodeName(node.declaration, options)
+    }
+
+    if (
+      node.type === 'ExpressionStatement' &&
+      node.expression.type === 'AssignmentExpression' &&
+      node.expression.left.type === 'MemberExpression' &&
+      node.expression.left.object.type === 'Identifier' &&
+      node.expression.left.object.name === 'module' &&
+      node.expression.left.property.type === 'Identifier' &&
+      node.expression.left.property.name === 'exports'
+    ) {
+      return getNodeName(node.expression.right, options)
+    }
+  }
+}

lib/utils/is-ignored-filename.js

@@ -0,0 +1,5 @@
+const ignoredFilenames = ['<text>', '<input>']
+
+module.exports = function isIgnoredFilename(filename) {
+  return ignoredFilenames.indexOf(filename) !== -1
+}

lib/utils/parse-filename.js

@@ -0,0 +1,12 @@
+const path = require('path')
+
+module.exports = function parseFilename(filename) {
+  const ext = path.extname(filename)
+
+  return {
+    dir: path.dirname(filename),
+    base: path.basename(filename),
+    ext,
+    name: path.basename(filename, ext),
+  }
+}