show uptime on index page

public/template/index.ecr

@@ -19,7 +19,7 @@
         "There might be moths here",
         "< 6 security vulnerabilities (for 2 of which a CVE is pending!)",
         "Overengineered Hellspawn",
-        "Home of <b>The Intrinsic</b>",
+        "Home of <b>The Intrinsic</b> and <b>Enigmatic</b>",
         "home of ㏒",
         "wake up, take a shit, novosibirsk",
         "The catalyst of ball itching",
@@ -42,7 +42,7 @@
       </p>
     </div>
     <div class="dim">
-      Crystal <%= Crystal::VERSION %> <pre><%= Crystal::BUILD_COMMIT %></pre> running on <pre><%= System.hostname %></pre>
+      Crystal <%= Crystal::VERSION %> <pre><%= Crystal::BUILD_COMMIT %></pre> running on <pre><%= System.hostname %></pre> for <%= CrystalGauntlet.uptime_s %>
     </div>
   </body>
 </html>

src/crystal-gauntlet.cr

@@ -48,6 +48,21 @@ module CrystalGauntlet
   @@endpoints = Hash(String, (HTTP::Server::Context -> String)).new
   @@template_endpoints = Hash(String, (HTTP::Server::Context -> String)).new
 
+  @@up_at = nil
+
+  def self.uptime
+    if !@@up_at
+      return Time::Span::ZERO
+    else
+      return Time.utc - @@up_at.not_nil!
+    end
+  end
+
+  def self.uptime_s
+    span = uptime
+    Format.fmt_timespan_long(span)
+  end
+
   def self.endpoints
     @@endpoints
   end
@@ -233,6 +248,7 @@ module CrystalGauntlet
         LOG.warn { "  #{" " * min_length}#{"^" * (max_length - min_length)}"}
       end
 
+      @@up_at = Time.utc
       LOG.notice { "Listening on #{listen_on.to_s.colorize(:white)}" }
       server.listen
     end

src/lib/format.cr

@@ -30,6 +30,21 @@ module CrystalGauntlet::Format
     end
   end
 
+  def fmt_timespan_bit(n : Int, s : String) : String | Nil
+    if n > 0
+      return "#{n} #{s}#{n == 1 ? "" : "s"}"
+    end
+  end
+
+  def fmt_timespan_long(s : Time::Span) : String
+    [
+      {s.days, "day"},
+      {s.hours, "hour"},
+      {s.minutes, "minute"},
+      {s.seconds, "second"}
+    ].map { |n, s| fmt_timespan_bit(n.floor().to_i, s) }.compact.join(" ")
+  end
+
   def fmt_time(s : Time, colon_safe=false) : String
     s.to_s(colon_safe ? TIME_FORMAT_USER_FRIENDLY : TIME_FORMAT_GD_FRIENDLY)
   end