#!/usr/bin/env sh
# compat: +ash +bash +dash +zsh YES_BB_AWK

trunc() { ### @-
    ### truncate text to fit within your terminal using the unicode character `…`.
    ###
    ### ```
    ### $ echo $COLUMNS
    ### 84
    ### $ seq 1 100 | tr '\n' ' ' | trunc
    ### 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31…
    ### ```

    [ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
    COLUMNS=${COLUMNS:-$(tput cols)}
    awk -vL=${1:-$COLUMNS} '{e=length()>L?"…":"";print substr($0,0,L-(e?1:0)) e}'
}

[ -n "${preload+-}" ] || trunc "$@"