monitor_corne.sh

#!/bin/bash
# ANSI escape codes
# Black        0;30     Dark Gray     1;30
# Red          0;31     Light Red     1;31
# Green        0;32     Light Green   1;32
# Brown/Orange 0;33     Yellow        1;33
# Blue         0;34     Light Blue    1;34
# Purple       0;35     Light Purple  1;35
# Cyan         0;36     Light Cyan    1;36
# Light Gray   0;37     White         1;37

# Define colour variables
BLACK='\033[0;30m'
RED='\033[0;31m'
GREEN='\033[0;32m'
ORANGE='\033[0;33m'
BLUE='\033[0;34m'
PURPLE='\033[0;35m'
CYAN='\033[0;36m'
LIGHT_GRAY='\033[0;37m'
DARK_GRAY='\033[1;30m'
LIGHT_RED='\033[1;31m'
LIGHT_GREEN='\033[1;32m'
YELLOW='\033[1;33m'
LIGHT_BLUE='\033[1;34m'
LIGHT_PURPLE='\033[1;35m'
LIGHT_CYAN='\033[1;36m'
WHITE='\033[1;37m'
NC='\033[0m'

# Create array of variables to iterate over
declare -A colours
colours[black]=${BLACK}
colours[red]=${RED}
colours[green]=${GREEN}
colours[orange]=${ORANGE}
colours[blue]=${BLUE}
colours[purple]=${PURPLE}
colours[cyan]=${CYAN}
colours[light_gray]=${LIGHT_GRAY}
colours[dark_gray]=${DARK_GRAY}
colours[light_red]=${LIGHT_RED}
colours[light_green]=${LIGHT_GREEN}
colours[yellow]=${YELLOW}
colours[light_blue]=${LIGHT_BLUE}
colours[light_purple]=${LIGHT_PURPLE}
colours[light_cyan]=${LIGHT_CYAN}
colours[white]=${WHITE}
colours[nc]=${NC}

# Demonstrate all colours
# for colour_key in "${!colours[@]}"
# do
#     printf "${NC}$colour_key text: ${colours[$colour_key]} example text\n"
# done

# This script monitors the USB connectivity of the corne v4.1 keyboard
# Functionality stages
# 1. Print to terminal every second with timestamps, message when keyboard not detected
# 1. Log to file `corne_disconnects.log`
# 3. Send `ntfy` notification upon disconnect

# Define log file
LOGFILE="./corne_disconnects.log"

# If keyboard isn't connected, print message and wait until connected
TIMESTAMP=$(date '+%Y-%m-%d_%H-%M-%S')
MSG="$TIMESTAMP - Script started"
printf "${NC}$MSG\n"
printf "$MSG\n" >> $LOGFILE


# Variable to only log disconnect once
dc_logged=false

while true
do
  lsusb_output=$(lsusb -d 4653:0004)
  TIMESTAMP=$(date '+%Y-%m-%d_%H-%M-%S')

  if ! [ -z "$lsusb_output" ]; then
    # If keyboard detected, print lsusb output for device to consol with timestamp
    dc_logged=false 
    MSG="$TIMESTAMP - $lsusb_output"
    printf "\r"
    printf "${GREEN}$MSG${NC}"
    #      "2024-11-09_13-30-07 - corne keyboard disconnected                      "
    #      "2024-11-09_13-27-27 - Bus 001 Device 038: ID 4653:0004 foostan Corne v4"
  else
    MSG="$TIMESTAMP - corne keyboard disconnected                      "
    printf "\r"
    printf "${LIGHT_RED}$MSG${NC}"
    #       2024-11-09_13-15-58 - Bus 001 Device 037: ID 4653:0004 foostan Corne v4
    if ! $dc_logged ; then
      # Print newline to leave disconnection log in terminal history
      printf "\n"
      # Log disconnect here
      printf "$MSG\n" >> $LOGFILE
      # Send notification, suppress output to terminal
      # curl -u <usr>:<pwd> -d "$MSG" <ntfy server>corne > /dev/null 2>&1
      dc_logged=true
    fi
  fi
  sleep 1
done