#!/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.


# cio
#
# Clipboard IO automatically figures out whether to copy/paste the text
# clipboard, depending on the piping of its standard input/output.
#
# When both its standard input/output are piped, it first updates the text
# clipboard, and then emits its new value to stdout.
#
# When run on its own (unpiped), it just emits the current text clipboard
# value to stdout.


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

get_clip() {
    if [ -e /dev/clipboard ]; then
        cat /dev/clipboard
        return $?
    fi
    if [ "$(which wclip)" ]; then
        wclip -o
        return $?
    fi
    if [ "$(which xclip)" ]; then
        xclip -sel clip -o
        return $?
    fi
    if [ "$(which pbpaste)" ]; then
        pbpaste
        return $?
    fi
    if [ "$(which powershell.exe)" ]; then
        # powershell.exe -NoProfile -c Get-Clipboard
        powershell.exe -NoProfile -c Get-Clipboard | python.exe -c '
from sys import stdin
for l in stdin:
    print(l, end="")'
        return $?
    fi

    printf "\e[31mcan't use the clipboard\e[0m\n" > /dev/stderr
    exit 1
}

set_clip() {
    if [ -e /dev/clipboard ]; then
        cat > /dev/clipboard
        return $?
    fi
    if [ "$(which wclip)" ]; then
        wclip
        return $?
    fi
    if [ "$(which xclip)" ]; then
        xclip -sel clip
        return $?
    fi
    if [ "$(which pbcopy)" ]; then
        pbcopy
        return $?
    fi

    if [ "$(which powershell.exe)" ]; then
        # powershell.exe -NoProfile -c Set-Clipboard -Value "$(cat)"
        powershell.exe -NoProfile -c '
        [console]::InputEncoding = [console]::OutputEncoding = New-Object System.Text.UTF8Encoding
        $Input | Set-Clipboard'
        return $?
    fi

    printf "\e[31mcan't use the clipboard\e[0m\n" > /dev/stderr
    exit 1
}

# handle both `... | cio` and `... | cio | ...`
if [ -p /dev/stdin ]; then
    cat | set_clip
    # ... | cio | ...
    if [ -p /dev/stdout ]; then
        get_clip
    fi
    exit $?
fi

# handle `cio | ...`
if [ -p /dev/stdout ]; then
    get_clip
    exit $?
fi

# handle `cio ...`
if [ $# -gt 0 ]; then
    cat "$@" | set_clip
    exit $?
fi

# handle `cio`
get_clip
exit $?