docs(readme): Update README

Author: azu

README.md

@@ -7,6 +7,7 @@ textlint rule that found mismatch date and weekday.
 Correct date and weekday.
 
     2016-12-29(Thursday)
+    2016-12-29(木曜)
 
 **NG**:
 
@@ -20,6 +21,8 @@ Incorrect date and weekday.
 
 ## Supported lang
 
+Automatically detect language from your text!
+
 - en
 - ja(日本語)
 - es
@@ -55,6 +58,42 @@ Via CLI
 textlint --rule date-weekday-mismatch README.md
 ```
 
+## Options
+
+- `lang`: string
+    - Default: none(Automatically detect language)
+    - Specify language for date string
+
+```json
+{
+    "rules": {
+        "date-weekday-mismatch": {
+            "lang": "ja"
+        }
+    }
+}
+```
+
+For example, `2016-12-30` is `en` by default.
+But, You can specify `2016-12-30` is `ja-JP` text by options
+
+```json
+{
+    "rules": {
+        "date-weekday-mismatch": {
+            "lang": "ja-JP"
+        }
+    }
+}
+```
+
+language format following ISO 639-1.
+
+e.g.) `en-US`, `en`, `ja` etc..
+
+- [ISO 639-1 - Wikipedia](https://en.wikipedia.org/wiki/ISO_639-1 "ISO 639-1 - Wikipedia")
+- [Moment.js | Docs](http://momentjs.com/docs/#/i18n/changing-locale/ "Moment.js | Docs")
+
 ## Acknowledge
 
 - [日付曜日矛盾 // Speaker Deck](https://speakerdeck.com/shirayu/ri-fu-yao-ri-mao-dun "日付曜日矛盾 // Speaker Deck")

src/textlint-rule-date-weekday-mismatch.js

@@ -7,19 +7,23 @@ const moment = require('moment');
  * @type {[RegExp]}
  */
 const supportedLang = [
-    [/^EN/, "en"],
-    [/^JP/, "ja"],
-    [/^ES/, "es"],
-    [/^FR/, "fr"],
-    [/^ZH/, "zh"]
+    [/^EN/i, "en"],
+    [/^JP/i, "ja"],
+    [/^ES/i, "es"],
+    [/^FR/i, "fr"],
+    [/^ZH/i, "zh"]
 ];
 
 /**
  * detect lang and return language string
  * @param {string[]} tags
+ * @param {string} [preferLang]
  * @returns {string|null}
  */
-const detectLang = (tags) => {
+const detectLang = (tags, preferLang) => {
+    if (preferLang) {
+        return preferLang;
+    }
     const targetLangs = supportedLang.filter(([langRegExp]) => {
         return tags.some(tag => langRegExp.test(tag));
     });
@@ -29,7 +33,13 @@ const detectLang = (tags) => {
     const selectedLang = targetLangs[0];
     return selectedLang[1];
 };
-function reporter(context) {
+/**
+ *
+ * @param context
+ * @param {Object} [config]
+ */
+function reporter(context, config = {}) {
+    const preferLang = config.lang;
     const {Syntax, RuleError, report, fixer, getSource} = context;
     if (typeof Intl === "undefined") {
         throw new Error("Not support your Node.js/browser. should be use latest version.");
@@ -39,13 +49,11 @@ function reporter(context) {
             const text = getSource(node);
             const chronoDate = chrono.parse(text);
             chronoDate.forEach(chronoDate => {
-                const lang = detectLang(Object.keys(chronoDate.tags));
+                const lang = detectLang(Object.keys(chronoDate.tags), preferLang);
                 if (!lang) {
                     // not found lang
                     return;
                 }
-                // change lang
-                moment.locale(lang);
                 // get weekday from actual date string
                 const kV = chronoDate.start.knownValues;
                 const $moment = moment(`${kV.year}-${kV.month}-${kV.day}`, "YYYY-MM-DD", lang);
@@ -67,9 +75,9 @@ function reporter(context) {
                 // format http://momentjs.com/docs/#/parsing/string-format/
                 const weekdayPatterns = [
                     // date-format , symbols
-                    ["dd", moment.weekdaysMin()],
-                    ["ddd", moment.weekdaysShort()],
-                    ["dddd", moment.weekdays()]
+                    ["dd", moment.localeData(lang).weekdaysMin()],
+                    ["ddd", moment.localeData(lang).weekdaysShort()],
+                    ["dddd", moment.localeData(lang).weekdays()]
                 ];
                 weekdayPatterns.forEach(([format, symbols]) => {
                     if (symbols.indexOf(maybeWeekdayText) === -1) {

test/textlint-rule-date-weekday-mismatch-test.js

@@ -34,6 +34,21 @@ tester.run("rule", rule, {
                 }
             ]
         },
+        // options
+        {
+            text: "2016-12-29(月)",
+            output: "2016-12-29(木)",
+            options: {
+                lang: "ja-JP"
+            },
+            errors: [
+                {
+                    message: "2016-12-29(月) mismatch weekday.\n2016-12-29(月) => 2016-12-29(木)",
+                    line: 1,
+                    column: 12
+                }
+            ]
+        },
         {
             text: "2016年12月29日（月曜日）",
             output: "2016年12月29日（木曜日）",