i3 status bar (cpu) temperature display enhancement

i3status-more.sh

#!/bin/sh

# colorize hardware temperatures for i3status (more red as temp gets closer to crit)
# (shell internal commands only)

## this script expects i3status to give output in the format of "i3bar", 
## and having a placeholder with string "TEMPERATURE"
## .config/i3status/config should contain something like this:
# general {
#        output_format = "i3bar"
# }
# order += "cpu_temperature 0"
# cpu_temperature 0 {
#   format = "TEMPERATURE"
# }

fix_name() {
  case "$1" in
  pch_skylake) echo "MB" ;;
  acpitz) echo "ACPI" ;;
  x86_pkg_temp) echo "x86" ;;
  asus) echo "ASUS" ;;
  cpu_fan) echo "CFN" ;;
  iwlwifi_*) echo "WiFi${1#iwlwifi_}" ;;
  "Package id "[0-9]) echo "CPU${1#Package id }" ;;
  "Core "[0-9]) echo "C${1#Core }" ;;
  *) echo "$1" ;;
  esac
}

read_hwmon() {
  local out=""
  for temp_file in /sys/class/hwmon/hwmon*/temp*_input; do
    read temp <"$temp_file" || continue
    color=""
    test ! -e "${temp_file%_input}_crit" || {
      read crit < "${temp_file%_input}_crit"
      perc="$(( ($temp-20000)*255/($crit-20000)))"
      color="$(printf "#%02x%02x%02x" $perc $((255-$perc)) 0)"
    }
    test -e "${temp_file%_input}_label" && read name <"${temp_file%_input}_label" || read name <"${temp_file%/*}/name"
    out="${out:+$out,}{\"full_text\":\"$(fix_name "$name") ${temp%???}°C\"${color:+,\"color\":\"$color\"}}"
    for fan_input in "${temp_file%/*}"/fan*_input; do
      test -e "$fan" || continue
      read fan <"$fan_input" || continue
      read name <"${fan_input%_input}_label"
      out="${out:+$out,}{\"full_text\":\"$(fix_name "$name") ${fan}RPM\"}"
    done
  done
  echo "$out"
}

fix_i3status() {
  local line="$1"
  local before="${line%%TEMPERATURE*}" after="${line##*TEMPERATURE}"
  before="${before%\{*}"
  after="${after#*\}}"

  case "${line%%TEMPERATURE*}" in
  "$line") echo "$line" ;;
  *) echo "${before}$(read_hwmon)${after}" ;;
  esac
}

i3status | while read line; do
  fix_i3status "$line"
done