File: folders.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (c) 2026 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the "Software"), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # folders [options...] [folders...]
  27 #
  28 # Show all folders in all the folders given, digging recursively into any/all
  29 # subfolders. When not given any folder name, the current one is used.
  30 #
  31 # Output is lines of absolute filepaths, one per line, without repetitions.
  32 #
  33 # The options are, available both in single and double-dash versions
  34 #
  35 #   -e, -empty    look only for empty folders
  36 #   -h, -help     show this help message
  37 #   -t, -top      limit search to top-level folders, ignoring subfolders
  38 
  39 
  40 case "$1" in
  41     -h|--h|-help|--help)
  42         if [ ! -d "$1" ]; then
  43             awk '/^# +folders /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  44             exit 0
  45         fi
  46     ;;
  47 esac
  48 
  49 empty=''
  50 max_depth=''
  51 
  52 for arg in "$@"; do
  53     if [ "${arg}" = '--' ]; then
  54         shift
  55         break
  56     fi
  57 
  58     case "${arg}" in
  59         -e|--e|-empty|--empty)
  60             empty='-empty'
  61             shift
  62             continue
  63         ;;
  64 
  65         -t|--t|-top|--top)
  66             max_depth='-maxdepth 1'
  67             shift
  68             continue
  69         ;;
  70     esac
  71 
  72     break
  73 done
  74 
  75 awk_command='awk'
  76 find_command='find'
  77 if [ -e /usr/bin/stdbuf ]; then
  78     if [ -p /dev/stdout ] || [ -t 1 ]; then
  79         awk_command='stdbuf -oL awk'
  80     fi
  81     find_command='stdbuf -oL find'
  82 fi
  83 
  84 options="-mindepth 1 ${max_depth} -type d ${empty}"
  85 
  86 for arg in "${@:-.}"; do
  87     if [ ! -d "${arg}" ]; then
  88         continue
  89     fi
  90 
  91     if echo "${arg}" | grep -q '/$'; then
  92         ${find_command} "${arg}" ${options} -exec realpath {} +
  93     else
  94         ${find_command} "${arg}/" ${options} -exec realpath {} +
  95     fi
  96 done | ${awk_command} '!c[$0]++; END { exit(NR == 0) }'