sudo apt-get install xvkbd python3 && sudo pip3 install pynput

sudo pip3 install --upgrade six

#!/bin/bash

# International keyboard (alternative to ibus for x11)
# Author: Bruno "GNUser" Dantas
# License: GPLv3
# Dependencies: 
#    sudo apt-get install xvkbd python3 yad
#    sudo pip3 install pynput
# Usage: 
#    - Change the triggers and unicode sequences in "watch_for_triggers" function to suit your needs
#    - Run this script as regular user to turn on the international keyboard
#    - Stop the script--via taskbar icon or, if running in terminal, Control+c--to clean up without a trace

main()
{
    create_pipe
    create_keylogger # writes to pipe
    create_taskbar_icon
    watch_for_triggers # reads from pipe, replaces user-defined character combinations with unicode characters
}

create_pipe()
{
    pipe=/tmp/international
    rm -f $pipe
    mkfifo $pipe
    exec 3<>$pipe
}

create_keylogger()
{
    # to troubleshoot the keylogger: 
    # 1. copy the python code below into a file foo
    # 2. comment out the three fifo lines, uncomment the print line in log_it function
    # 3. in a terminal: python3 /path/to/foo
    # 4. type stuff outside the terminal and watch terminal
    echo "
from pynput import keyboard
from pynput import mouse
import os

fifo_write = open('$pipe', 'w')

def log_it(output):
    fifo_write.write(output + '\n')
    fifo_write.flush()
    #print(output)

# get initial capslock state
exit_code = os.system('''xset q 2>/dev/null | grep -q -E 'Caps Lock: +on' ''')
if exit_code == 0:
    capslock_in_effect = True
else:
    capslock_in_effect = False

# this function runs each time a key is pressed:
def on_press(key): 
    global capslock_in_effect
    output = str(key)
    if output == 'Key.caps_lock': # if capslock pressed, toggle capslock state
        capslock_in_effect = not capslock_in_effect
    if not output.startswith('Key'): # special keys start with 'Key' and can be logged as-is
        output = output[1:-1] # remove quotes around character
        if capslock_in_effect:
            output = output.swapcase()
    if not output.startswith('Key.shift'): # don't log shift keys (e.g., while loop expects a~ not aKey.shift~)
        log_it(output)

# this function runs each time a mouse button is pressed:
def on_click(x, y, button, pressed):
    button = str(button)
    if pressed and button == 'Button.left':
        log_it('Key.mousebutton_left')

# start listening
with mouse.Listener(on_click=on_click) as listener:
    with keyboard.Listener(on_press=on_press) as listener:
        listener.join()
" >/tmp/tiny-keylogger
    python3 /tmp/tiny-keylogger &
}

echo "$(basename $0)" >/tmp/scriptname # so cleanup function can find this script's name when called from yad
cleanup()
{
    echo "Cleaning up..."
    pkill -f International # kill taskbar icon                     
    pkill -f tiny-keylogger # kill keylogger
    pkill -KILL "$(cat /tmp/scriptname)" # kill this script         
}
trap cleanup EXIT HUP TERM INT

create_taskbar_icon()
{
    export -f cleanup
    yad --notification --image='accessories-character-map' --text='International Keyboard' \
        --no-middle --menu="Stop!bash -c cleanup" --command='' &
}

replace()
{
    xvkbd -xsendevent -text "\b\b\[U$1]" # send two backspaces then desired unicode character
}

watch_for_triggers()
{
    # endless loop (it reads from a fifo pipe, so never encounters EOF)
    while read current_char; do
        echo "${previous_char}${current_char}" # for debugging while running in terminal
        case "${previous_char}${current_char}" in
          # Portuguese
            'A`') replace 00C0;;
            'a`') replace 00E0;;
            "A'") replace 00C1;;
            "a'") replace 00E1;;
            'A^') replace 00C2;;
            'a^') replace 00E2;;
            'A~') replace 00C3;;
            'a~') replace 00E3;;
            "E'") replace 00C9;;
            "e'") replace 00E9;;
            'E^') replace 00CA;;
            'e^') replace 00EA;;
            "I'") replace 00CD;;
            "i'") replace 00ED;;
            'O`') replace 00D2;;
            'o`') replace 00F2;;
            "O'") replace 00D3;;
            "o'") replace 00F3;;
            'O^') replace 00D4;;
            'o^') replace 00F4;;
            'O~') replace 00D5;;
            'o~') replace 00F5;;
            "U'") replace 00DA;;
            "u'") replace 00FA;;
            'U;') replace 00DC;;
            'u;') replace 00FC;;
            'C;') replace 00C7;;
            'c;') replace 00E7;;
          # Esperanto
            'Cx') replace 0108;;
            'CX') replace 0108;;
            'cx') replace 0109;;
            'Gx') replace 011C;;
            'GX') replace 011C;;
            'gx') replace 011D;;
            'Hx') replace 0124;;
            'HX') replace 0124;;
            'hx') replace 0125;;
            'Jx') replace 0134;;
            'JX') replace 0134;;
            'jx') replace 0135;;
            'Sx') replace 015C;;
            'SX') replace 015C;;
            'sx') replace 015D;;
            'Ux') replace 016C;;
            'UX') replace 016C;;
            'ux') replace 016D;;
        esac
        previous_char=$current_char
    done <&3
}

main

ho ho ho

ho ho h