From a3e7f8f4fb71a616f54779493a74cfb1a90302fa Mon Sep 17 00:00:00 2001
From: Yusuke Fujiki <yusuke@fujikkys.com>
Date: Thu, 8 Aug 2019 09:10:37 +0900
Subject: [PATCH 1/2] Set original path for redirect url

---
 src/wrap-page.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/wrap-page.js b/src/wrap-page.js
index 9a280b7..918b99f 100644
--- a/src/wrap-page.js
+++ b/src/wrap-page.js
@@ -43,7 +43,7 @@ export default ({ element, props }) => {
 
   const { pageContext, location } = props
   const { intl } = pageContext
-  const { language, languages, redirect, routed } = intl
+  const { language, languages, redirect, routed, originalPath } = intl
 
   if (typeof window !== "undefined") {
     window.___gatsbyIntl = intl
@@ -52,7 +52,7 @@ export default ({ element, props }) => {
   const isRedirect = redirect && !routed
 
   if (isRedirect) {
-    const { pathname, search } = location
+    const { search } = location
 
     // Skip build, Browsers only
     if (typeof window !== "undefined") {
@@ -68,7 +68,7 @@ export default ({ element, props }) => {
       }
 
       const queryParams = search || ""
-      const newUrl = withPrefix(`/${detected}${pathname}${queryParams}`)
+      const newUrl = withPrefix(`/${detected}${originalPath}${queryParams}`)
       window.localStorage.setItem("gatsby-intl-language", detected)
       window.location.replace(newUrl)
     }

From 20bd538e56082f48ed4318a137dad525f56bb8e4 Mon Sep 17 00:00:00 2001
From: Yusuke Fujiki <yusuke@fujikkys.com>
Date: Thu, 8 Aug 2019 10:33:59 +0900
Subject: [PATCH 2/2] Fix changeLocale with prefix path

---
 src/link.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/link.js b/src/link.js
index 6a5fd75..93197ac 100644
--- a/src/link.js
+++ b/src/link.js
@@ -55,6 +55,15 @@ export const changeLocale = (language, to) => {
   }
   const { routed } = window.___gatsbyIntl
 
+  const removePrefix = pathname => {
+    const base =
+      typeof __BASE_PATH__ !== `undefined` ? __BASE_PATH__ : __PATH_PREFIX__
+    if (base && pathname.indexOf(base) === 0) {
+      pathname = pathname.slice(base.length)
+    }
+    return pathname
+  }
+
   const removeLocalePart = pathname => {
     if (!routed) {
       return pathname
@@ -63,7 +72,8 @@ export const changeLocale = (language, to) => {
     return pathname.substring(i)
   }
 
-  const pathname = to || removeLocalePart(window.location.pathname)
+  const pathname =
+    to || removeLocalePart(removePrefix(window.location.pathname))
   // TODO: check slash
   const link = `/${language}${pathname}${window.location.search}`
   localStorage.setItem("gatsby-intl-language", language)