Eduardo IdNotFound

#
# timelast  -  shows how long the last running command lasted
# http://idnotfound.wordpress.com/2008/10/14/a-bash-plugin-timelast/
#


# this is the command called by the user
timelast () {
    # shows a pretty output like '1h23m45s'

    # how many seconds it took
    ret="$(( $_timelast_time % 60 ))s"
    cur=$(( $_timelast_time / 60 ))

    # tests for minutes
    if [ $cur -gt 0 ]; then
        ret="$(( $cur % 60 ))m${ret}"
        cur=$(( $cur / 60 ))
    fi

    # tests for hours
    if [ $cur -gt 0 ]; then
        ret="${cur}h${ret}"
    fi

    # echoes on the screen
    echo $ret
    return 0
}


# internal command that calculates the running time of the last process
# (add to $PROMPT_COMMAND, so it is executed at each prompt -- see below)
_timelast_promptcommand () {
    # grab the timestamp of the last command from history
    # (depends on $HISTTIMEFORMAT="%s " -- see below)
    _timelast_start="$(history | tail -n1 | awk '{ print $2 }')"

    # now grab the timestamp for the current time
    _timelast_end="$(date +%s)"

    # subtract and... voila! elapsed seconds! :-)
    _timelast_time="$(( $_timelast_end - $_timelast_start ))"

    return 0
}


## sets up initial values and important variables in bash

# timestamps the command history so we know when commands were performed
export HISTTIMEFORMAT="%s "

# calculates how long the last command ran for at every prompt shown
export PROMPT_COMMAND="_timelast_promptcommand; ${PROMPT_COMMAND}"