initial msys compatibility

abaddon.cpp

@@ -728,6 +728,17 @@ EmojiResource &Abaddon::GetEmojis() {
 int main(int argc, char **argv) {
     if (std::getenv("ABADDON_NO_FC") == nullptr)
         Platform::SetupFonts();
+
+    char *systemLocale = std::setlocale(LC_ALL, "");
+    try {
+        std::locale::global(std::locale(systemLocale));
+    } catch (...) {
+        try {
+            std::locale::global(std::locale::classic());
+            std::setlocale(LC_ALL, systemLocale);
+        } catch (...) {}
+    }
+
 #if defined(_WIN32) && defined(_MSC_VER)
     TCHAR buf[2] { 0 };
     GetEnvironmentVariableA("GTK_CSD", buf, sizeof(buf));

discord/snowflake.cpp

@@ -2,6 +2,7 @@
 #include <ctime>
 #include <iomanip>
 #include <chrono>
+#include <glibmm.h>
 
 constexpr static uint64_t DiscordEpochSeconds = 1420070400;
 
@@ -42,14 +43,12 @@ bool Snowflake::IsValid() const {
     return m_num != Invalid;
 }
 
-std::string Snowflake::GetLocalTimestamp() const {
+Glib::ustring Snowflake::GetLocalTimestamp() const {
     const time_t secs_since_epoch = (m_num / SecondsInterval) + DiscordEpochSeconds;
     const std::tm tm = *localtime(&secs_since_epoch);
-    std::stringstream ss;
-    const static std::locale locale("");
-    ss.imbue(locale);
-    ss << std::put_time(&tm, "%X %x");
-    return ss.str();
+    std::array<char, 256> tmp;
+    std::strftime(tmp.data(), sizeof(tmp), "%X %x", &tm);
+    return tmp.data();
 }
 
 void from_json(const nlohmann::json &j, Snowflake &s) {

discord/snowflake.hpp

@@ -12,7 +12,7 @@ struct Snowflake {
     static Snowflake FromNow(); // not thread safe
 
     bool IsValid() const;
-    std::string GetLocalTimestamp() const;
+    Glib::ustring GetLocalTimestamp() const;
 
     bool operator==(const Snowflake &s) const noexcept {
         return m_num == s.m_num;

util.cpp

@@ -1,5 +1,6 @@
 #include "util.hpp"
 #include <filesystem>
+#include <array>
 
 Semaphore::Semaphore(int count)
     : m_count(count) {}
@@ -93,11 +94,9 @@ std::string FormatISO8601(const std::string &in, int extra_offset, const std::st
     int offset = GetTimezoneOffset();
     tm.tm_sec += offset + extra_offset;
     mktime(&tm);
-    std::stringstream ss;
-    const static std::locale locale("");
-    ss.imbue(locale);
-    ss << std::put_time(&tm, fmt.c_str());
-    return ss.str();
+    std::array<char, 512> tmp;
+    std::strftime(tmp.data(), sizeof(tmp), fmt.c_str(), &tm);
+    return tmp.data();
 }
 
 void ScrollListBoxToSelected(Gtk::ListBox &list) {