add fancy countdown timer (in bash)

scripts/countdown

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# 👆 hazel i hope you're happy
+
+# challenges released in EST
+export TZ="America/New_York"
+
+function init_day {
+    day=$(($(date +%d)))
+
+    if [ ! -f $day.rkt ]; then
+        scripts/make-day $day
+        scripts/get-challenge $day
+        return 1
+    fi
+    return 0
+}
+
+if init_day; then
+    next_day=$(($day + 1))
+    next_timestamp=$(date --date="$(date +%Y-%m)-$next_day" +%s)
+    while true; do
+        secs_left=$(($next_timestamp - $(date +%s)))
+        if [ $secs_left -le 0 ]; then
+            break
+        fi
+        printf "\r\x1b[K%s secs left..." "$secs_left"
+    done
+    printf "\r\x1b[K"
+    init_day
+fi