clsh.sh

#!/bin/bash
 
server()
{
    # Wait for command file to show up and send it to running bash
    fswatch $cmdDir "cat $cmdFile | /bin/bash -i >> $logFile 2>&1"
}
 
client()
{
    local lastSize=$(stat -f %z $logFile)
    local size=$lastSize
    local wheel=("|" "/" "-" "\\\\")  # Spinning wheel
    # Force a prompt at start to confirm connection
    local line="echo \"session started on $serverCode\""
    echo "" > $cmdFile
 
    while [[ -n $line ]] || read line
    do
        # Send command
        echo "$line" > $cmdFile
 
        # Wait for output
        echo -n "Waiting...."
        let i=0
        while [[ $size -eq $lastSize ]]
        do
            # Should really use inotifywait here but it doesn't seem to work
            # with the way Dropbox updates $logFile.
            sleep 0.5
            echo -n -e "${wheel[$i]}\b"
            let i=(i+1)%4
            size=$(stat -f %z $logFile)
        done
 
        # Display output
        if [[ $size -lt $lastSize ]]
        then
            echo "Error; please try again"
        else
            echo -n -e "\r            \r"
            tail -c $((size - lastSize)) $logFile | grep -v "bash-3.2$ exit" | grep -v "bash: no job control in this shell"
        fi
 
        lastSize=$size
        line=
    done
}


if [[ $1 = "-s" ]]
then
  isServer=true
  serverCode=$2
else
  isServer=false
  serverCode=$1
fi

baseDir=~/Dropbox/remote/$serverCode
cmdDir=$baseDir/in
cmdFile=$baseDir/in/in
logFile=$baseDir/out/out

if [[ $1 = "-s" ]]
then
    server
else
    client
fi