format timestamps and place them on the right (#17)

components/chatmessage.cpp

@@ -1080,7 +1080,10 @@ ChatMessageHeader::ChatMessageHeader(const Message *data) {
     else if (data->WebhookID.has_value())
         m_extra->set_markup("<b>Webhook</b>");
 
-    m_timestamp->set_text(data->Timestamp);
+    m_timestamp->set_text(data->ID.GetLocalTimestamp());
+    m_timestamp->set_hexpand(true);
+    m_timestamp->set_halign(Gtk::ALIGN_END);
+    m_timestamp->set_ellipsize(Pango::ELLIPSIZE_END);
     m_timestamp->set_opacity(0.5);
     m_timestamp->set_single_line_mode(true);
     m_timestamp->set_margin_start(12);
@@ -1090,6 +1093,7 @@ ChatMessageHeader::ChatMessageHeader(const Message *data) {
     m_main_box->set_vexpand(true);
     m_main_box->set_can_focus(true);
 
+    m_meta_box->set_hexpand(true);
     m_meta_box->set_can_focus(false);
 
     m_content_box->set_can_focus(false);

discord/snowflake.cpp

@@ -1,4 +1,6 @@
 #include "snowflake.hpp"
+#include <ctime>
+#include <iomanip>
 
 Snowflake::Snowflake()
     : m_num(Invalid) {}
@@ -23,6 +25,16 @@ bool Snowflake::IsValid() const {
     return m_num != Invalid;
 }
 
+std::string Snowflake::GetLocalTimestamp() const {
+    const time_t secs_since_epoch = (m_num / 4194304000) + 1420070400;
+    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();
+}
+
 void from_json(const nlohmann::json &j, Snowflake &s) {
     if (j.is_string()) {
         std::string tmp;

discord/snowflake.hpp

@@ -10,6 +10,7 @@ struct Snowflake {
     Snowflake(const Glib::ustring &str);
 
     bool IsValid() const;
+    std::string GetLocalTimestamp() const;
 
     bool operator==(const Snowflake &s) const noexcept {
         return m_num == s.m_num;