#!/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.


# links [options...] [files...]
#
# This script finds all web (hyper)links in the input(s) given, specifically
# HTTP/HTTPS links, showing each match on its own output line. It can match
# multiple links on each input line.
#
# The help option is `-h`, `--h`, `-help`, or `--help`.


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

awk '{
    # ignore notifications (code 9) and hyperlinks (code 8)
    gsub(/\x1b\](8|9);[^\x07]*\x07/, "")
    # ignore cursor-movers and style-changers
    gsub(/\x1b\[([0-9]*[A-HJKST]|[0-9;]*m)/, "")

    s = $0
    while (match(s, /https?:\/\/[A-Za-z0-9+_.:%-]+(\/[A-Za-z0-9+_.%\/,#?&=-]*)*/)) {
        print substr(s, RSTART, RLENGTH)
        s = substr(s, RSTART + RLENGTH)
    }
}' "$@"