#!/bin/sh -e

# (encoding: UTF-8)

#

# tt 0.6 - Time Tracker

#   (Instructions using -h)

# LICENSE

# Copyright (C) 2009 Lluís Batlle i Rossell

# 

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

PNAME=`basename "$0"`

if [ -z "$EDITOR" ]; then

	EDITOR=vim

fi

if [ -z "$TT_PROJECT" ]; then

	TT_PROJECT=$HOME/.tt

fi

function usage

{

	echo "Usage: $PNAME <-s|-l|-t|-h>"

    echo "       $PNAME <task>"

    echo "Manual:"

    echo "  Switch to a task         :  tt mytask"

    echo "  List task switches       :  tt -l"

    echo "  List time spent per task :  tt -t"

    echo "  Sum times given with -t  :  tt -t | grep ... | tt -s"

    echo "  List what is tracked     :  tt"

    echo "  \$TT_PROJECT or ~/.tt stores the tracking."

}

function date2iso

{

	date -d "$1" '+%Y-%m-%d %T'

}

function date2timestamp

{

	date -d "$1" '+%s'

}

function add

{

	echo "`date2iso now`"$'\t'"$1" >> "$TT_PROJECT"

}

function list

{

	if [ -f "$TT_PROJECT" ]; then

		cat "$TT_PROJECT"

	fi

}

function listtime

{

	if [ -f "$TT_PROJECT" ]; then

		cat < "$TT_PROJECT" |

        (

            read A

            STARTTIME=`echo "$A" | cut -f 1`

            NAME=`echo "$A" | cut -f 2`

            while read A; do

                ENDTIME=`echo "$A" | cut -f 1`

                echo `timebetween "$STARTTIME" "$ENDTIME"` \

                    "$NAME" "($STARTTIME)"

                NAME=`echo "$A" | cut -f 2`

                STARTTIME="$ENDTIME"

            done

            echo `timebetween "$STARTTIME" now` \

                "$NAME" "($STARTTIME)"

        )

	fi

}

function sec2hms

{

    MINUTES=0

    HOURS=0

    SECONDS=$1

    if [ $SECONDS -ge 60 ]; then

        MINUTES=$((SECONDS / 60))

        SECONDS=$((SECONDS - MINUTES * 60))

    fi

    if [ $MINUTES -ge 60 ]; then

        HOURS=$((MINUTES / 60))

        MINUTES=$((MINUTES - HOURS * 60))

    fi

    printf "%02d:%02d:%02d\n" $HOURS $MINUTES $SECONDS

}

function timebetween

{

	STARTSEC=`date2timestamp "$1"`

	ENDSEC=`date2timestamp "$2"`

    SECONDS=$((ENDSEC - STARTSEC))

    echo `sec2hms $SECONDS`

}

function status

{

	if [ -f "$TT_PROJECT" ]; then

        NAME=`tail -n 1 "$TT_PROJECT" | cut -f 2`

        STARTDATE=`tail -n 1 "$TT_PROJECT" | cut -f 1`

        echo `timebetween "$STARTDATE" "now"` "$NAME"

    fi

}

function sum

{

    VAL=`awk -F : -- '

    BEGIN { val=0; }

    { val += $1 * 60 * 60 + $2 * 60 + $3 }

    END { print val }' `

    echo `sec2hms $VAL`

}

if [ $# -eq 0 ]; then

	status || exit 1

elif [ "$1" == "-l" ]; then

	list

elif [ "$1" == "-t" ]; then

	listtime

elif [ "$1" == "-s" ]; then

	sum

elif [ "$1" == "-h" ]; then

	usage

else

	add $@

fi

exit 0