dwmstatus

#!/bin/bash
#
# file:        dwmstatus
# author:      Brian Buccola <brian.buccola@gmail.com>
#
# description: Functions for printing system info into dwm's status bar via
#              xsetroot.

bat() {
    bat_status=$(</sys/class/power_supply/BAT0/status)
    bat_pct=$(</sys/class/power_supply/BAT0/capacity)
    bat_time_left=$(acpi -b | head -n1 | awk '{ print $5 }' | cut -d: -f1,2)

    echo -n "$bat_pct%"
    [[ "$bat_status" = "Discharging" ]] && echo -n " ($bat_time_left)"
    [[ "$bat_status" = "Charging"    ]] && echo -n " (charging)"
    [[ "$bat_status" = "Unknown"     ]] && echo -n " (idle)"
}

ban() {
    interface=$(iwconfig 2>&1 | awk '/^w/ { print $1 }')
    rx1=$(</sys/class/net/"$interface"/statistics/rx_bytes)
    tx1=$(</sys/class/net/"$interface"/statistics/tx_bytes)

    sleep 1

    rx2=$(</sys/class/net/"$interface"/statistics/rx_bytes)
    tx2=$(</sys/class/net/"$interface"/statistics/tx_bytes)

    rx_rate=$(( $rx2 - $rx1 ))
    tx_rate=$(( $tx2 - $tx1 ))

    # shift by 10 bytes to get KiB/s.
    rx_kib=$(( $rx_rate >> 10 ))
    tx_kib=$(( $tx_rate >> 10 ))

    # incoming
    echo -n "down: "
    if [[ "$rx_rate" -gt 1048576 ]]; then
        printf '%sM' $(echo "scale=1; $rx_kib / 1024" | bc)
    else
        echo -n "${rx_kib}K"
    fi

    echo -n " "

    # outgoing
    echo -n "up: "
    if [[ "$tx_rate" -gt 1048576 ]]; then
        printf '%sM' $(echo "scale=1; $tx_kib / 1024" | bc)
    else
        echo -n "${tx_kib}K"
    fi
}

dat() {
    date '+%a %d %b %H:%M'
}

mem() {
    mem=$(awk '/^Mem/ { print $3 }' <(free -h))

    echo -n "$mem"
}

mpd() {
    mpd=$(mpc current -f '[%artist% - ]%title%')

    [[ -n "$mpd" ]] && echo -n "$mpd" || exit 1
}

ups() {
    ups_official=$(</tmp/checkup-official)
    ups_aur=$(</tmp/checkup-aur)

    echo -n "$ups_official($ups_aur)"
}

vol() {
    vol_status=$(amixer get Master | tail -n1 | sed -r 's/.*\[(on|off)\].*/\1/')
    vol_pct=$(amixer get Master | tail -n1 | sed -r 's/.*\[(.*)%\].*/\1/')

    [[ "$vol_status" = "off" ]] && echo -n "mute"
    [[ "$vol_status" = "on"  ]] && echo -n "$vol_pct%"
}

wea() {
    weather=$(</tmp/weather)

    echo -n "$weather"
}

wif() {
    interface=$(iwconfig 2>&1 | awk '/^w/ { print $1 }')
    wifi_essid=$(iwconfig "$interface" | awk -F '"' '/ESSID/ { print $2 }')
    wifi_status=$(</sys/class/net/"$interface"/operstate)
    wifi_quality=$(grep "$interface" /proc/net/wireless | awk '{ print int($3 * 100 / 70) }')

    [[ "$wifi_status" = "up"   ]] && echo -n "$wifi_essid $wifi_quality%" || exit 1
}

if [[ "$(wif)" ]]; then
    xsetroot -name "$(mpd && echo -n ' · ')$(wif) · $(ban) · $(ups) · bat: $(bat) · vol: $(vol) · $(wea) · $(dat)"
else
    xsetroot -name "$(mpd && echo -n ' · ')bat: $(bat) · vol: $(vol) · $(dat)"
fi