#!/bin/sh

# The MIT License (MIT)
#
# Copyright © 2024 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.


# wctabs [options...] [filepaths...]
#
# Run `wc` (word-count) with the arguments given, turning its output into
# lines of tab-separated values: this removes output-parsing ambiguities,
# in case of filepaths with spaces in them.
#
# You can run `wc --help` to see all its options, which you can also use
# with this script.


# handle help option(s)
case "$1" in
    -h|--h|-help|--help)
        awk '/^# +wctabs/, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;
esac

# avoid testing all permutations of up to 5 single-char options
stats=$(awk 'BEGIN {
    bytes = 0
    chars = 0
    words = 0
    lines = 0
    maxll = 0

    for (i = 1; i < ARGC; i++) {
        s = ARGV[i]
        delete ARGV[i]

        if (s !~ /^-/) continue

        switch (s) {
        case "--bytes":
            bytes = 1
            break
        case "--chars":
            chars = 1
            break
        case "--lines":
            lines = 1
            break
        case "--words":
            words = 1
            break
        case "--max-line-length":
            maxll = 1
            break
        default:
            if (s ~ /c/) bytes = 1
            else if (s ~ /m/) chars = 1
            else if (s ~ /w/) words = 1
            else if (s ~ /l/) lines = 1
            else if (s ~ /L/) maxll = 1
            else {
                stderr = "/dev/stderr"
                printf "\x1b[31munsupported wc option %s\x1b[0m\n", s > stderr
            }
            break
        }
    }

    stats = bytes + chars + words + lines + maxll
    # `wc` defaults to 3 stats when not explicitly given any option
    print (stats == 0) ? 3 : stats
}' "$@")

errmsg="only up to 5 wc options are supported"
longcmd="s-^ +--; s- +-\t-1; s- +-\t-1; s- +-\t-1; s- +-\t-1; s- +-\t-1"

case "${stats}" in
    1) wc "$@" | sed -E 's-^ +--; s- +-\t-1';;
    2) wc "$@" | sed -E 's-^ +--; s- +-\t-1; s- +-\t-1';;
    3) wc "$@" | sed -E 's-^ +--; s- +-\t-1; s- +-\t-1; s- +-\t-1';;
    4) wc "$@" | sed -E 's-^ +--; s- +-\t-1; s- +-\t-1; s- +-\t-1; s- +-\t-1';;
    5) wc "$@" | sed -E "${longcmd}";;
    *)
        printf "\e[31m%s: %s\e[0m\n" "$0" "${errmsg}" > /dev/stderr
        exit 1
    ;;
esac