From e8affa85b0a403ac818a5e032644ba53d2e52fb5 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Thu, 4 Feb 2021 20:42:32 +0400
Subject: [PATCH] Try to open localized changelog.

---
 Telegram/SourceFiles/boxes/about_box.cpp      |  3 +-
 Telegram/SourceFiles/core/application.cpp     | 33 +++++++++++++++++++
 Telegram/SourceFiles/core/application.h       |  1 +
 Telegram/SourceFiles/core/changelogs.cpp      |  2 +-
 .../SourceFiles/window/window_main_menu.cpp   |  2 +-
 5 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/Telegram/SourceFiles/boxes/about_box.cpp b/Telegram/SourceFiles/boxes/about_box.cpp
index 31798dc594..c43cb3afaf 100644
--- a/Telegram/SourceFiles/boxes/about_box.cpp
+++ b/Telegram/SourceFiles/boxes/about_box.cpp
@@ -17,6 +17,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/platform/base_platform_info.h"
 #include "core/click_handler_types.h"
 #include "core/update_checker.h"
+#include "core/application.h"
 #include "styles/style_layers.h"
 #include "styles/style_boxes.h"
 
@@ -109,7 +110,7 @@ void AboutBox::showVersionHistory() {
 
 		Ui::show(Box<InformBox>("The link to the current private alpha version of Telegram Desktop was copied to the clipboard."));
 	} else {
-		UrlClickHandler::Open(qsl("https://desktop.telegram.org/changelog"));
+		UrlClickHandler::Open(Core::App().changelogLink());
 	}
 }
 
diff --git a/Telegram/SourceFiles/core/application.cpp b/Telegram/SourceFiles/core/application.cpp
index 045146b0c5..719f9fbe35 100644
--- a/Telegram/SourceFiles/core/application.cpp
+++ b/Telegram/SourceFiles/core/application.cpp
@@ -764,6 +764,39 @@ bool Application::openInternalUrl(const QString &url, QVariant context) {
 	return openCustomUrl("internal:", InternalUrlHandlers(), url, context);
 }
 
+QString Application::changelogLink() const {
+	const auto base = u"https://desktop.telegram.org/changelog"_q;
+	const auto languages = {
+		"id",
+		"de",
+		"fr",
+		"nl",
+		"pl",
+		"tr",
+		"uk",
+		"fa",
+		"ru",
+		"ms",
+		"es",
+		"it",
+		"uz",
+		"pt-br",
+		"be",
+		"ar",
+		"ko",
+	};
+	const auto current = _langpack->id().replace("-raw", "");
+	if (current.isEmpty()) {
+		return base;
+	}
+	for (const auto language : languages) {
+		if (current == language || current.split(u'-')[0] == language) {
+			return base + "?setln=" + language;
+		}
+	}
+	return base;
+}
+
 bool Application::openCustomUrl(
 		const QString &protocol,
 		const std::vector<LocalUrlHandler> &handlers,
diff --git a/Telegram/SourceFiles/core/application.h b/Telegram/SourceFiles/core/application.h
index 15a5fcb1a6..4342f315fd 100644
--- a/Telegram/SourceFiles/core/application.h
+++ b/Telegram/SourceFiles/core/application.h
@@ -227,6 +227,7 @@ public:
 	void checkStartUrl();
 	bool openLocalUrl(const QString &url, QVariant context);
 	bool openInternalUrl(const QString &url, QVariant context);
+	[[nodiscard]] QString changelogLink() const;
 
 	// Float player.
 	void setDefaultFloatPlayerDelegate(
diff --git a/Telegram/SourceFiles/core/changelogs.cpp b/Telegram/SourceFiles/core/changelogs.cpp
index 52d1c8d4cf..87b2f70980 100644
--- a/Telegram/SourceFiles/core/changelogs.cpp
+++ b/Telegram/SourceFiles/core/changelogs.cpp
@@ -185,7 +185,7 @@ void Changelogs::addLocalLogs() {
 			lt_changes,
 			tr::lng_new_version_minor(tr::now),
 			lt_link,
-			qsl("https://desktop.telegram.org/changelog"));
+			Core::App().changelogLink());
 		addLocalLog(text.trimmed());
 	}
 }
diff --git a/Telegram/SourceFiles/window/window_main_menu.cpp b/Telegram/SourceFiles/window/window_main_menu.cpp
index 8a6cd9aa40..cbb07f8c3f 100644
--- a/Telegram/SourceFiles/window/window_main_menu.cpp
+++ b/Telegram/SourceFiles/window/window_main_menu.cpp
@@ -616,7 +616,7 @@ MainMenu::MainMenu(
 		qsl("https://desktop.telegram.org")));
 	_telegram->setLinksTrusted();
 	_version->setRichText(textcmdLink(1, tr::lng_settings_current_version(tr::now, lt_version, currentVersionText())) + QChar(' ') + QChar(8211) + QChar(' ') + textcmdLink(2, tr::lng_menu_about(tr::now)));
-	_version->setLink(1, std::make_shared<UrlClickHandler>(qsl("https://desktop.telegram.org/changelog")));
+	_version->setLink(1, std::make_shared<UrlClickHandler>(Core::App().changelogLink()));
 	_version->setLink(2, std::make_shared<LambdaClickHandler>([] { Ui::show(Box<AboutBox>()); }));
 
 	_controller->session().downloaderTaskFinished(