# ===== helper functions

# Return the name of the program which is called in the foreground with `fg`.
# $1 is the name of the program (optional). If it's not 'fg' or 'fg *' it's
# returned unchanged.
zshrc_resolve_fg_to_resumed_job_name() {
    # $REPLY is used by convention for scalars ($reply for arrays) to return
    # values from functions. unset it here to prevent problems when REPLY is
    # bound to an integer or similar. Thanks to Mikachu in #zsh on Freenode
    # (2012-09-27 17:14 CEST) for this hint.
    unset REPLY

    # Replace fg with the resumed job name.
    if [[ $1 == fg ]]; then
        REPLY=${jobtexts[%+]}
    elif [[ $1 == fg\ * ]]; then
        REPLY=${jobtexts[${1#fg }]}
    # Normal program, return as is.
    else
        REPLY=$1
    fi
}

# ===== runtime display
# necessary for $EPOCHSECONDS, the UNIX time.
zmodload zsh/datetime

typeset -a zshrc_longrun_data
zshrc_longrun_data=()
# Display runtime in seconds for long running programs (> 60 seconds) and send
# a bell to notify me.
zshrc_longrun_preexec() {
    local program=$3

    # Handle fg.
    local REPLY
    zshrc_resolve_fg_to_resumed_job_name $program
    program=$REPLY

    # No background process found.
    if [[ -z $program ]]; then
        return
    fi

    # Don't track the time for certain (possible) long running processes which
    # need no automatic notification.
    local ignore
    for ignore in elinks man mutt vim ssh; do
        case $program in
            $ignore | $ignore\ *)
                zshrc_longrun_data=()
                return
                ;;
        esac
    done

    zshrc_longrun_data=($program $EPOCHSECONDS)
}
zshrc_longrun_precmd() {
    # No previous timestamp available or disabled for this command, ignore.
    if [[ -z $zshrc_longrun_data ]]; then
        return
    fi

    local difference=$(( EPOCHSECONDS - zshrc_longrun_data[2] ))
    if [[ $difference -gt 60 ]]; then
        echo
        echo -n "${fg[yellow]}"
        echo -n "~> ${(V)zshrc_longrun_data[1]} took $difference seconds."
        echo -n "${fg[default]}"
        echo    "\a" # send bell
    fi

    # Clear status. Prevents displaying old status information when pressing
    # enter with an empty command line.
    zshrc_longrun_data=()
}

preexec_functions+=(zshrc_longrun_preexec)
precmd_functions+=(zshrc_longrun_precmd)