CecClient.py

#!/usr/bin/env python 



import atexit
import time
import subprocess
import re

class CecClient(object):
    
    regex_pattern = "(?<=key pressed: )[\w\s\d]+?(?=\s?\(\s?[0-9A-Fa-f]+,\s+\d\))"

    def __init__(self):
        self.pattern = re.compile( CecClient.regex_pattern )

    def start(self):

        proc = subprocess.Popen(["cec-client"], stdout=subprocess.PIPE)

        while True:
            line = proc.stdout.readline()
            line = line.decode("utf-8")
            
            match = re.search( self.regex_pattern ,line )
            if match : 
                key =  match[0]
                self.dispatch(key)

    def dispatch(self,key):
        name = f"on_{key}"
        if hasattr(self,name) :
            method = getattr(self,name)
            method()
        else:
            print(f"{key} pressed, but no action defined")


    def on_right(self):
        print(" right button.")

    def on_down(self):
        print(" down button.")

    def on_left(self):
        print(" left button.")

    def on_up(self):
        print(" up button.")

    def on_play(self):
        print(" play button.")

    def on_select(self):
        print(" select  button.")

    def on_pause(self):
        print(" pause button.")

    def on_forward(self):
        print(" forward button.")

    def on_backward(self):
        print(" backward button.")

    def on_exit(self):
        print(" exit button.")

    def on_clear(self):
        print(" clear button.")


def on_exit():
    print("Good-Bye\n")



if __name__ == "__main__" : 

    atexit.register( on_exit )
    try:
        cec = CecClient()
        cec.start()

    except KeyboardInterrupt:
        pass