Add custom textlint rule file under textfile dir

Author: smikitky

package.json

@@ -79,7 +79,7 @@
     "format:source": "prettier --config .prettierrc --write \"{gatsby-*.js,{flow-typed,plugins,src}/**/*.js}\"",
     "format:examples": "prettier --config examples/.prettierrc --write \"examples/**/*.js\"",
     "lint": "eslint .",
-    "lint:text": "textlint content/{docs,home,tutorial,warnings}/*.md",
+    "lint:text": "textlint --rulesdir=./textlint content/{docs,home,tutorial,warnings}/*.md",
     "netlify": "yarn --version && rimraf node_modules && yarn install --frozen-lockfile --check-files && yarn build",
     "nit:source": "prettier --config .prettierrc --list-different \"{gatsby-*.js,{flow-typed,plugins,src}/**/*.js}\"",
     "nit:examples": "prettier --config examples/.prettierrc --list-different \"examples/**/*.js\"",

textlint/jp-reactjs-org-lint.js

@@ -0,0 +1,19 @@
+/**
+ * @param {RuleContext} context
+ */
+module.exports = context => {
+  return {
+    [context.Syntax.Str]: node => {
+      const text = context.getSource(node);
+      const match = /下さい/.exec(text);
+      if (match) {
+        context.report(
+          node,
+          new context.RuleError(
+            `「下さい」の代わりに「ください」を使ってください。`,
+          ),
+        );
+      }
+    },
+  };
+};