124 lines
3 KiB
Bash
Executable file
124 lines
3 KiB
Bash
Executable file
#!/usr/bin/env bash
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# INTERVAL is equal to 1s because we want to express the bandwidth in sec
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readonly INTERVAL=1
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# UPLOAD and DOWNLOAD index
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readonly UPLOAD=0
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readonly DOWNLOAD=1
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# SIZE index are the multiple of the unit byte and value the internationally recommended unit symbol in sec
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readonly SIZE=(
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[1]='B/s'
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[1024]='kB/s'
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[1048576]='MB/s'
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[1073741824]='GB/s'
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)
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# interface_get try to automaticaly get the used interface if network_name is empty
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interface_get() {
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name="$(tmux show-option -gqv "@kanagawa-network-bandwidth")"
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if [[ -z $name ]]; then
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case "$(uname -s)" in
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Linux)
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if type ip >/dev/null; then
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name="$(ip -o route get 192.168.0.0 | awk '{print $5}')"
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fi
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;;
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Darwin)
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if type route >/dev/null; then
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name="$(route -n get 192.168.0.0 2>/dev/null | awk '/interface: / {print $2}')"
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fi
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;;
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esac
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fi
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echo "$name"
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}
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# interface_bytes give an interface name and return both tx/rx Bytes, separated by whitespace (upload first)
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interface_bytes() {
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case "$(uname -s)" in
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Linux)
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upload=$(cat "/sys/class/net/$1/statistics/tx_bytes")
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download=$(cat "/sys/class/net/$1/statistics/rx_bytes")
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echo "$upload $download"
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;;
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Darwin)
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# column 7 is Ibytes (in bytes, rx, download) and column 10 is Obytes (out bytes, tx, upload)
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netstat -nbI "$1" | tail -n1 | awk '{print $10 " " $7}'
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;;
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esac
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}
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# get_bandwidth return the number of bytes exchanged for tx and rx
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get_bandwidth() {
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local upload=0
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local download=0
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IFS=' ' read -r upload download <<< "$(interface_bytes "$1")"
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# wait for interval to calculate the difference
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sleep "$INTERVAL"
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IFS=' ' read -r new_upload new_download <<< "$(interface_bytes "$1")"
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upload=$(( $new_upload - $upload ))
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download=$(( $new_download - $download ))
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# set to 0 by default
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echo "${upload:-0} ${download:-0}"
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}
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# bandwidth_to_unit convert bytes into its highest unit and add unit symbol in sec
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bandwidth_to_unit() {
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local size=1
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for i in "${!SIZE[@]}"; do
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if (($1 < i)); then
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break
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fi
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size="$i"
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done
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local result="0.00"
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if (($1 != 0)); then
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result="$(awk -v a="$1" -v b="$size" 'BEGIN { printf "%.2f\n", a / b }' </dev/null)"
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fi
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echo "$result ${SIZE[$size]}"
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}
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main() {
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counter=0
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bandwidth=()
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network_name=""
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show_interface="$(tmux show-option -gqv "@kanagawa-network-bandwidth-show-interface")"
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interval_update="$(tmux show-option -gqv "@kanagawa-network-bandwidth-interval")"
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if [[ -z $interval_update ]]; then
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interval_update=0
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fi
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while true; do
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if ((counter == 0)); then
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counter=60
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network_name="$(interface_get)"
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fi
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IFS=" " read -ra bandwidth <<<"$(get_bandwidth "$network_name")"
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if [[ $show_interface == "true" ]]; then echo -n "[$network_name] "; fi
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echo "↓ $(bandwidth_to_unit "${bandwidth[$DOWNLOAD]}") • ↑ $(bandwidth_to_unit "${bandwidth[$UPLOAD]}")"
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((counter = counter - 1))
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sleep "$interval_update"
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done
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}
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#run main driver
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main
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