From 94748d2996210cb3a30999e3a6bf4dbcc92adf83 Mon Sep 17 00:00:00 2001
From: Yuya Ochiai <yuya0321@gmail.com>
Date: Wed, 9 Dec 2015 00:19:58 +0900
Subject: [PATCH] Use 'Meiryo UI' and 'MS Gothic' to prevent CJK fonts on
 Windows(JP)

---
 src/css/jp_fonts.css |  9 +++++++++
 src/index.js         | 30 ++++++++++++++++++++++++++++++
 src/package.json     |  3 +++
 3 files changed, 42 insertions(+)
 create mode 100644 src/css/jp_fonts.css

diff --git a/src/css/jp_fonts.css b/src/css/jp_fonts.css
new file mode 100644
index 00000000..22e36fe4
--- /dev/null
+++ b/src/css/jp_fonts.css
@@ -0,0 +1,9 @@
+@font-face {
+  font-family: sans-serif;
+  src: local('Meiryo UI');
+}
+
+@font-face {
+  font-family: monospace;
+  src: local('MS Gothic');
+}
\ No newline at end of file
diff --git a/src/index.js b/src/index.js
index ce0d1696..f7d904f8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,6 +2,9 @@
 
 const electron = require('electron');
 const remote = electron.remote;
+const osLocale = require('os-locale');
+const fs = require('fs');
+
 var url = require('url');
 
 var contextMenu = require('./menus/context');
@@ -44,6 +47,33 @@ webView.addEventListener('new-window', function(e) {
   }
 });
 
+webView.addEventListener("dom-ready", function() {
+  // webView.openDevTools();
+
+  // Use 'Meiryo UI' and 'MS Gothic' to prevent CJK fonts on Windows(JP).
+  if (process.platform === 'win32') {
+    var applyCssFile = function(cssFile) {
+      fs.readFile(cssFile, 'utf8', function(err, data) {
+        if (err) {
+          console.log(err);
+          return;
+        }
+        webView.insertCSS(data);
+      });
+    };
+
+    osLocale(function(err, locale) {
+      if (err) {
+        console.log(err);
+        return;
+      }
+      if (locale === 'ja_JP') {
+        applyCssFile(__dirname + '/css/jp_fonts.css');
+      }
+    });
+  }
+});
+
 // Count unread channels.
 var timer = setInterval(function() {
   webView.send('retrieveUnreadCount');
diff --git a/src/package.json b/src/package.json
index 068ea86b..9bca25fb 100644
--- a/src/package.json
+++ b/src/package.json
@@ -7,5 +7,8 @@
   "license": "MIT",
   "devDependencies": {
     "electron-connect": "^0.3.3"
+  },
+  "dependencies": {
+    "os-locale": "^1.4.0"
   }
 }