Bash script to re-connect Bluetooth headphones on Linux via bluetoothctl and PulseAudio

.zshrc

hp() {
    ~/headphones.sh
}

headphones.sh

#!/bin/bash

# device MAC

DEVICE_MAC="41:42:DB:A9:E6:8D"
DEVICE_MAC_UNDERSCORE="${DEVICE_MAC//:/_}"
TIMEOUT=60

# colors

GREEN="\033[0;32m"
RED="\033[0;31m"
CYAN="\033[0;36m"
NO_COLOR="\033[0m"

untrust_device() {
    echo -e "${CYAN}Untrusting device $DEVICE_MAC...${NO_COLOR}"

    bluetoothctl untrust $DEVICE_MAC

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Untrusted device $DEVICE_MAC${NO_COLOR}"
    else
        echo -e "${RED}Failed to untrust device $DEVICE_MAC, but it's probably OK${NO_COLOR}"
    fi
}

forget_device() {
    echo -e "${CYAN}Forgetting device $DEVICE_MAC...${NO_COLOR}"

    bluetoothctl remove $DEVICE_MAC

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Forgot device $DEVICE_MAC${NO_COLOR}"
    else
        echo -e "${RED}Failed to forget device $DEVICE_MAC, but it's probably OK${NO_COLOR}"
    fi
}

restart_bluetooth() {
    echo -e "${CYAN}Restarting Bluetooth service...${NO_COLOR}"

    sudo systemctl restart bluetooth \
    && sleep 3

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Bluetooth service restarted successfully${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to restart Bluetooth service${NO_COLOR}"
        return 1
    fi
}

scan_for_devices() {
    echo -e "${CYAN}Starting scan for devices for $TIMEOUT seconds...${NO_COLOR}"

    bluetoothctl scan on &

    SCAN_PID=$!
    START_TIME=$(date +%s)

    while true; do
        if bluetoothctl devices | grep -q "$DEVICE_MAC"; then
            echo -e "${GREEN}Device $DEVICE_MAC found${NO_COLOR}"

            kill $SCAN_PID

            return 0
        fi

        CURRENT_TIME=$(date +%s)
        if [ $((CURRENT_TIME - START_TIME)) -ge $TIMEOUT ]; then
            echo -e "${RED}Timeout: device $DEVICE_MAC not found within $TIMEOUT seconds${NO_COLOR}"

            kill $SCAN_PID

            return 1
        fi

        sleep 1
    done
}

pair_device() {
    echo -e "${CYAN}Pairing with device $DEVICE_MAC...${NO_COLOR}"

    bluetoothctl pair $DEVICE_MAC

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Paired with device $DEVICE_MAC${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to pair with device $DEVICE_MAC${NO_COLOR}"
        return 1
    fi
}

connect_device() {
    echo -e "${CYAN}Connecting to device $DEVICE_MAC...${NO_COLOR}"

    bluetoothctl connect $DEVICE_MAC

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Connected to device $DEVICE_MAC${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to connect to device $DEVICE_MAC${NO_COLOR}"
        return 1
    fi
}

trust_device() {
    echo -e "${CYAN}Trusting device $DEVICE_MAC...${NO_COLOR}"

    bluetoothctl trust $DEVICE_MAC

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Trusted device $DEVICE_MAC${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to trust device $DEVICE_MAC${NO_COLOR}"
        return 1
    fi
}

set_default_output() {
    echo -e "${CYAN}Setting default output...${NO_COLOR}"

    SINK_INDEX=$(pacmd list-sinks | grep -B 1 "name:.*$DEVICE_MAC_UNDERSCORE" | grep index | awk '{print $3}')
    echo "Sink index: $SINK_INDEX"

    pacmd set-default-sink $SINK_INDEX

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Set default output successfully${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to set default output${NO_COLOR}"
        return 1
    fi
}

set_default_input() {
    echo -e "${CYAN}Setting default input...${NO_COLOR}"

    SOURCE_INDEX=$(pacmd list-sources | grep -B 1 "name:.*$DEVICE_MAC_UNDERSCORE" | grep index | awk '{print $3}')
    echo "Source index: $SINK_INDEX"

    pacmd set-default-source $SOURCE_INDEX

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Set default input successfully${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to set default input${NO_COLOR}"
        return 1
    fi
}

set_output() {
    echo -e "${CYAN}Setting output...${NO_COLOR}"

    SINK_INDEX=$(pacmd list-sinks | grep -B 1 "name:.*$DEVICE_MAC_UNDERSCORE" | grep index | awk '{print $3}')
    echo "Sink index: $SINK_INDEX"

    pacmd list-sink-inputs | grep index | while read line
    do
        INPUT_INDEX=$(echo $line | cut -f2 -d' ')
        echo "Input index: $INPUT_INDEX"

        pacmd move-sink-input $INPUT_INDEX $SINK_INDEX
    done

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Set output successfully${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to set output${NO_COLOR}"
        return 1
    fi
}

set_input() {
    echo -e "${CYAN}Setting input...${NO_COLOR}"

    SOURCE_INDEX=$(pacmd list-sources | grep -B 1 "name:.*$DEVICE_MAC_UNDERSCORE" | grep index | awk '{print $3}')
    echo "Source index: $SINK_INDEX"

    pacmd list-source-outputs | grep index | while read line
    do
        OUTPUT_INDEX=$(echo $line | cut -f2 -d' ')
        echo "Output index: $OUTPUT_INDEX"

        pacmd move-source-output $OUTPUT_INDEX $SOURCE_INDEX
    done

    if [ $? -eq 0 ]; then
        echo -e "${GREEN}Set input successfully${NO_COLOR}"
        return 0
    else
        echo -e "${RED}Failed to set input${NO_COLOR}"
        return 1
    fi
}

# remove device

untrust_device
forget_device

# re-add device

restart_bluetooth \
&& scan_for_devices \
&& pair_device \
&& connect_device \
&& trust_device \
&& set_default_output \
&& set_default_input \
&& set_output \
&& set_input