file server started in supervisor tree

lib/plantid_discord_bot/utils/duration.ex

@@ -0,0 +1,19 @@
+# https://rosettacode.org/wiki/Convert_seconds_to_compound_duration
+defmodule PlantIdDiscordBot.Utils.Duration do
+  @minute 60
+  @hour @minute * 60
+  @day @hour * 24
+  @week @day * 7
+  @divisor [@week, @day, @hour, @minute, 1]
+
+  def sec_to_str(sec) do
+    {_, [s, m, h, d, w]} =
+      Enum.reduce(@divisor, {sec, []}, fn divisor, {n, acc} ->
+        {rem(n, divisor), [div(n, divisor) | acc]}
+      end)
+
+    ["#{w}w", "#{d}d", "#{h}h", "#{m}m", "#{s}s"]
+    |> Enum.reject(fn str -> String.starts_with?(str, "0") end)
+    |> Enum.join(" ")
+  end
+end