runnet_sender.sh

#!/bin/bash

# This script is meant to send commands over the network to my laptop,
# which will then run those commands. The output will be displayed on
# screen.

#
# dir1='/run/user/1000/gvfs/smb-share:server=buddha-hp-compaq-nw8440-rn039aw-ak8.local,share=buddha'
dir1="${HOME}/buddha"
dir2="${dir1}/run"
bn='run_commands'
list="${dir2}/${bn}_list.txt"
stdout="${dir2}/${bn}_stdout.log"
switch_f="${dir2}/${bn}_switch.txt"

count=0
run=0

declare -a commands

# trap ctrl-c and call ctrl_c()
trap ctrl_c INT

ctrl_c () {
    echo "** Trapped CTRL-C"
    exit
}

# Creates the 'switch' function, which will wait if $switch_f is
# set to '1'.
switch () {
    switch=$(cat "$switch_f")

    while [[ $switch -eq 1 ]]; do
        sleep 1

        switch=$(cat "$switch_f")
    done
}

# Creates a function called 'spin', which will show a simple animation,
# while waiting for the command output.
spin () {
    spinner=( '   ' '.  ' '.. ' '...' )

    while [[ 1 ]]; do
        for s in "${spinner[@]}"; do
            echo -ne "\rWait${s}"
            sleep 0.5
        done
    done
}

if [[ ! -f $list ]]; then
    echo "Receiver list doesn't yet exist!"
    exit
fi

while [[ 1 ]]; do
    echo -e "\nStart typing commands, and finish with 'run'!\n"

    until [[ $run -eq 1 ]]; do
        read tmp

        if [[ $tmp != 'run' ]]; then
            commands[${count}]="$tmp"
        else
            run=1
        fi

        let count++
    done

    count=0
    run=0

    for (( i = 0; i < ${#commands[@]}; i++ )); do
        command="${commands[${i}]}"

        if [[ -z $command ]]; then
            continue
        fi

# stdbuf -o 0 echo "$command" >&3
        echo "$command" >> "$list"

        clear

        spin &
        spin_pid="$!"

# Waiting for the receiver script to get a chance to
# flip the switch variable. Otherwise, output will be displayed
# too quickly.
        sleep 0.1

        switch

        sync

        kill "$spin_pid"

        clear

        less +G "$stdout"

        unset -v command
    done

    unset -v commands
done