#!/bin/sh

# The MIT License (MIT)
#
# Copyright (c) 2026 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


# files [options...] [folders/files...]
#
#
# Show all files in all the folders given, digging recursively into any/all
# subfolders. When not given any name, the current folder is used by default.
#
# All filenames given are given back, which allows picking files using the
# so-called `glob` patterns, which can be mixed with folder names.
#
# Output is lines of absolute filepaths, one per line, without repetitions.
#
# The options are, available both in single and double-dash versions
#
#   -e, -empty    look only for empty files
#   -h, -help     show this help message
#   -t, -top      limit search to top-level files, ignoring subfolders


case "$1" in
    -h|--h|-help|--help)
        if [ ! -e "$1" ]; then
            awk '/^# +files /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
            exit 0
        fi
    ;;
esac

empty=''
max_depth=''

for arg in "$@"; do
    if [ "${arg}" = '--' ]; then
        shift
        break
    fi

    case "${arg}" in
        -e|--e|-empty|--empty)
            empty='-empty'
            shift
            continue
        ;;

        -t|--t|-top|--top)
            max_depth='-maxdepth 1'
            shift
            continue
        ;;
    esac

    break
done

awk_command='awk'
find_command='find'
if [ -e /usr/bin/stdbuf ]; then
    if [ -p /dev/stdout ] || [ -t 1 ]; then
        awk_command='stdbuf -oL awk'
    fi
    find_command='stdbuf -oL find'
fi

options="${max_depth} -type f ${empty}"

for arg in "${@:-.}"; do
    if [ -f "${arg}" ]; then
        printf "%s\n" "$(realpath "${arg}")"
        continue
    fi

    if [ -d "${arg}" ]; then
        if echo "${arg}" | grep -q '/$'; then
            ${find_command} "${arg}" ${options} -exec realpath {} +
        else
            ${find_command} "${arg}/" ${options} -exec realpath {} +
        fi
    fi
done | ${awk_command} '!c[$0]++; END { exit(NR == 0) }'