info-timezone: add script

Author: VanillaViking

polybar-scripts/info-timezone/README.md

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+# Script: info-timezone
+
+A custom polybar script to  switch the timezone of the date displayed.
+
+![info-timezone](screenshots/1.gif)
+
+
+## Module
+
+```ini
+[module/info-timezone]
+type = custom/script
+exec = ~/polybar-scripts/info-timezone.sh
+tail = true
+click-left = kill -USR1 %pid%
+```

polybar-scripts/info-timezone/info-timezone.sh

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+#!/bin/sh
+
+# Change format here. see `man date` for format controls.
+FORMAT="%I:%M %p"
+
+# Add the timezones of your choice. see `timedatectl list-timezones`.
+set -- "UTC-0" "Australia/Sydney" "Asia/Kolkata" "America/Chicago"
+
+TIMEZONES_LENGTH=$#
+current_idx=1
+
+print_date() {
+  TZ=${current_timezone:?} date +"${FORMAT}" | echo "${current_timezone:?}: $(cat -)"
+}
+
+update_current_timezone() {
+  current_idx=$(($((current_idx+1)) % $(("$TIMEZONES_LENGTH"+1))))
+  if [ $current_idx -lt 1 ]; then
+    current_idx=1
+  fi
+}
+
+click() {
+  update_current_timezone
+  print_date
+}
+
+trap "click" USR1
+
+while true; do
+  eval "current_timezone=\${$current_idx}"
+  print_date current_timezone
+  sleep 5 &
+  wait
+done