#
# returns difference between two input $HISTTIMEFORMAT times
# can return:
#
#       mtime (== days, suitable for "find -mtime")
#       mmin (== minutes, suitable for "find -mmin")
#       time_t (== seconds)
#
# return value depends on the function name used to invoke
#

source ~/lib/sh/include
require fsetvar
require freturn
require timefmt_to_time_t

timefmt_delta_mmin ()   { local -i i;
                          fsetvar i timefmt_delta_time_t $1 $2;
                          freturn $((i / 60)); }

timefmt_delta_mtime ()  { local -i i;
                          fsetvar i timefmt_delta_time_t $1 $2;
                          freturn $((i / 60 / 60 / 24)); }

timefmt_delta_time_t ()
{
        local -i timefmt1=$1
        local -i timefmt2=$2
        local -i timet1
        local -i timet2
        local -i delta

        (($# == 2)) || {
                echo "$FUNCNAME: needs two dates in \$HISTTIMEFORMAT format"
                return 1
        }

        fsetvar timet1 timefmt_to_time_t $timefmt1 ||
                { echo "wrong1"; return 1; }

        fsetvar timet2 timefmt_to_time_t $timefmt2 ||
                { echo "wrong2"; return 1; }

        if ((timet1 > timet2)); then
                delta=$((timet1 - timet2))
        else
                delta=$((timet2 - timet1))
        fi

        freturn $delta
}
# vim:syn=sh:ft=sh