File: folders.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2025 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        look only for empty folders
  36 #   -empty    look only for empty folders
  37 #
  38 #   -h        show this help message
  39 #   -help     show this help message
  40 #
  41 #   -t        limit search to top-level folders, ignoring subfolders
  42 #   -top      limit search to top-level folders, ignoring subfolders
  43 
  44 
  45 case "$1" in
  46     -h|--h|-help|--help)
  47         if [ ! -d "$1" ]; then
  48             awk '/^# +folders /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  49             exit 0
  50         fi
  51     ;;
  52 esac
  53 
  54 empty=''
  55 max_depth=''
  56 
  57 for arg in "$@"; do
  58     if [ "${arg}" = '--' ]; then
  59         shift
  60         break
  61     fi
  62 
  63     case "${arg}" in
  64         -e|--e|-empty|--empty)
  65             empty='-empty'
  66             shift
  67         ;;
  68 
  69         -t|--t|-top|--top)
  70             max_depth='-maxdepth 1'
  71             shift
  72         ;;
  73     esac
  74 done
  75 
  76 command='awk'
  77 if [ -p /dev/stdout ] || [ -t 1 ]; then
  78     command='stdbuf -oL awk'
  79 fi
  80 
  81 options="-mindepth 1 ${max_depth} -type d ${empty}"
  82 
  83 for arg in "${@:-.}"; do
  84     if [ ! -d "${arg}" ]; then
  85         continue
  86     fi
  87 
  88     if echo "${arg}" | grep -q '/$'; then
  89         stdbuf -oL find "${arg}" ${options} -exec realpath {} +
  90     else
  91         stdbuf -oL find "${arg}/" ${options} -exec realpath {} +
  92     fi
  93 done | ${command} '!c[$0]++; END { exit(NR == 0) }'