cpu_freq

#!/bin/bash

CLASS=""
TOOLTIP=""
TEXT=""
PERCENTAGE=""

while getopts "hj" arg; do
    case $arg in
    h)
        echo "usage:"
        echo "  -h  show this help text"
        echo "  -j  json output (for waybar)"
        ;;
    j)
        JSON=1
        ;;
    *)
        ;;
    esac
done

function getHumanReadable {
    local FACTOR=10000
    local PRECISION=100
    local ROUNDED="$(("$1" / "$FACTOR"))"
    echo "$(("$ROUNDED" / "$PRECISION")).$(("$ROUNDED" % "$PRECISION"))"
}

function getPercentage {
    local MIN=$1
    local MAX=$2
    local INPUT=$3
    echo "$(( (("$INPUT" - "$MIN") * 100) / ("$MAX" - "$MIN") ))"
}

RAW_FREQ=$(cpupower frequency-info -f | grep "current CPU frequency:" | grep -Eo '[0-9]+([.][0-9]+)?')

FREQ="$(getHumanReadable "$RAW_FREQ")"

LIMITS=$(cpupower frequency-info -l | tail -n1)
MIN_LIMIT=${LIMITS// [0-9]*/""}
MAX_LIMIT=${LIMITS//[0-9]* /""}

PERCENTAGE="$(getPercentage "$MIN_LIMIT" "$MAX_LIMIT" "$RAW_FREQ")"

if [[ "$FREQ" != *"."* ]]; then
    FREQ="0.$FREQ"
fi

TEXT="$(printf '%.2f GHz\n' "$FREQ")"

TOOLTIP="Minimum frequency: $(getHumanReadable "$MIN_LIMIT") GHz\nMaximum frequency: $(getHumanReadable "$MAX_LIMIT") GHz\nCurrent frequency: $FREQ GHz ($PERCENTAGE %)"

CLASS="slow"
[[ "$PERCENTAGE" -gt "55" ]] && CLASS="medium"
[[ "$PERCENTAGE" -gt "85" ]] && CLASS="fast"

if [[ "$JSON" == "1" ]]; then
    echo "{\"text\": \"$TEXT\", \"tooltip\": \"$TOOLTIP\", \"class\": \"$CLASS\", \"percentage\": $PERCENTAGE}"
else
    echo "$TEXT"
fi