fold.sh

   1 #!/usr/bin/env bash
   2
   3 fold() {
   4         shopt -s checkwinsize
   5         (
   6                 :
   7                 :
   8         )
   9         width="${1:-$COLUMNS}"
  10         while read -r line; do
  11                 : "${line//     / }"
  12                 IFS=$'\n' read -d "" -ra words <<<"${line// /$'\n'}"
  13                 ll=0
  14                 for word in "${words[@]}"; do
  15                         wl="${#word}"
  16                         if ((ll + wl > width)); then
  17                                 printf '\n'
  18                         else
  19                                 ((ll += wl))
  20                                 printf '%s ' "$word"
  21                         fi
  22                 done
  23         done
  24 }
  25
  26 fold "$@"