Track.sh

#!/bin/bash
FILE=$LOGFILE
WORKING_DIR=$(pwd)
MESSAGE="This program works as follows: track [start | <jobname>][stop][status]

            track start <jobname>, will start track logging in the specified log file.
            track status, reads from the last line of the log file and checks if there is a logged job.
            track stop, stop the job
            "
if [ -z "$FILE" ]; # check if there is an environment - if not export default one
then
    echo "No environment variable set"
    echo "Setting environment variable LOGFILE=${WORKING_DIR}/LOGFILE.txt'"
    # export LOGFILE=${WORKING_DIR}/LOGFILE.txt default working dir
    export LOGFILE=~/.local/share/LOGFILE.txt
fi

if [ ! -f "$FILE" ]; then # if logfile does not exit create one.
    touch $LOGFILE
    FILE=$LOGFILE
    echo "Created file $LOGFILE"
    echo $MESSAGE
fi

startDateString=""
declare -a durations # durations array for appending duration of task. Then it can be printed out later.
track () {
    if [[ $# -eq 0 ]]; then # no args
        echo $MESSAGE
        exit 1 
    fi
    type="$1"
    label="$2"
    line=$(tail -n 1 $FILE) # read last line of file
    jobName=$(tail -n 1 $FILE| cut -d " " -f 5) # get the label name of the job
    case "$type" in
        "start")
            if [[ -z $label ]]; then
                echo "missing label to start job" && exit 1
            fi
            
            if [ ! -z "$line" ]; then
                echo "Job is already running" && exit 1
            else
                startDateFormatted=$(date '+%A, %B %d, %Y. %H:%M:%S')
                startDateString=$(date '+%H:%M:%S')
                echo "START ${startDateFormatted}" >> $FILE
                echo "LABEL This is task $label" >> $FILE
            fi
            ;;
        "stop")
            isEnd=$(tail -n 1 $FILE | cut -d ' ' -f 1)
            if [[ $isEnd == "LABEL" ]] # Check that job is not running.
            then
                # Get end label format dates and calculate duration.
                # Add duration to durations array 
                # append to file
                endLabel=$(tail -n 1 $FILE | cut -d ' ' -f 5)
                stopDateFormatted=$(date '+%A, %B %d, %Y. %H:%M:%S') # for display
                stopDateString=$(date '+%H:%M:%S')  # for calculating duration
                StartDate=$(date -u -d "$startDateString" +"%s")
                FinalDate=$(date -u -d "$stopDateString" +"%s")
                duration=$(date -u -d "0 $FinalDate sec - $StartDate sec" +"%H:%M:%S")
                str="Task ${endLabel}: ${duration}"
                durations+=($str)
                echo "END ${stopDateFormatted}" >> $FILE
                echo >> $FILE
            else
                echo "No jobs running"
            fi
            ;;
        "status")
            if [[ $jobName ]] ; then
                echo $startDate
                echo "Currently tracking: $jobName"
            else
                echo "No jobs running"
            fi
            ;;
        "log")
            for value in "${durations[@]}"
            do
                echo $value
            done
            
            ;;
        *)
            echo $MESSAGE
            ;;

    esac
}