Helper functions for any bash script for colour formatting and day-to-day usage

bash_text_formatting.sh

# Load various colour hacks for the terminal
load_colours()
{
    # From https://stackoverflow.com/a/28938235
    # Reset
    NC='\033[0m'       # Text Reset

    # Regular Colors
    Black='\033[0;30m'        # Black
    Red='\033[0;31m'          # Red
    Green='\033[0;32m'        # Green
    Yellow='\033[0;33m'       # Yellow
    Blue='\033[0;34m'         # Blue
    Purple='\033[0;35m'       # Purple
    Cyan='\033[0;36m'         # Cyan
    White='\033[0;37m'        # White

    # Bold
    BBlack='\033[1;30m'       # Black
    BRed='\033[1;31m'         # Red
    BGreen='\033[1;32m'       # Green
    BYellow='\033[1;33m'      # Yellow
    BBlue='\033[1;34m'        # Blue
    BPurple='\033[1;35m'      # Purple
    BCyan='\033[1;36m'        # Cyan
    BWhite='\033[1;37m'       # White

    # Underline
    UBlack='\033[4;30m'       # Black
    URed='\033[4;31m'         # Red
    UGreen='\033[4;32m'       # Green
    UYellow='\033[4;33m'      # Yellow
    UBlue='\033[4;34m'        # Blue
    UPurple='\033[4;35m'      # Purple
    UCyan='\033[4;36m'        # Cyan
    UWhite='\033[4;37m'       # White

    # Background
    On_Black='\033[40m'       # Black
    On_Red='\033[41m'         # Red
    On_Green='\033[42m'       # Green
    On_Yellow='\033[43m'      # Yellow
    On_Blue='\033[44m'        # Blue
    On_Purple='\033[45m'      # Purple
    On_Cyan='\033[46m'        # Cyan
    On_White='\033[47m'       # White

    # High Intensity
    IBlack='\033[0;90m'       # Black
    IRed='\033[0;91m'         # Red
    IGreen='\033[0;92m'       # Green
    IYellow='\033[0;93m'      # Yellow
    IBlue='\033[0;94m'        # Blue
    IPurple='\033[0;95m'      # Purple
    ICyan='\033[0;96m'        # Cyan
    IWhite='\033[0;97m'       # White

    # Bold High Intensity
    BIBlack='\033[1;90m'      # Black
    BIRed='\033[1;91m'        # Red
    BIGreen='\033[1;92m'      # Green
    BIYellow='\033[1;93m'     # Yellow
    BIBlue='\033[1;94m'       # Blue
    BIPurple='\033[1;95m'     # Purple
    BICyan='\033[1;96m'       # Cyan
    BIWhite='\033[1;97m'      # White

    # High Intensity backgrounds
    On_IBlack='\033[0;100m'   # Black
    On_IRed='\033[0;101m'     # Red
    On_IGreen='\033[0;102m'   # Green
    On_IYellow='\033[0;103m'  # Yellow
    On_IBlue='\033[0;104m'    # Blue
    On_IPurple='\033[0;105m'  # Purple
    On_ICyan='\033[0;106m'    # Cyan
    On_IWhite='\033[0;107m'   # White
}

# Choosing BIBlue because it looks decently good on white-on-black, black-on-white, and light-solarized terminal colour themes.
echo_h1()
{
    echo -e "${BIBlue}==> ${NC}$1"
}

echo_h1_error()
{
    echo -e "${BIBlue}==> ${BIRed}$1${NC}"
}

echo_h2()
{
    if [ $VERBOSE != "/dev/null" ]; then
        echo -e "${Purple}    --> $1${NC}"
    fi
}

echo_h3()
{
    if [ $VERBOSE != "/dev/null" ]; then
        echo -e "${Purple}        --> $1${NC}"
    fi
}


spinner_pid=

start_spinner()
{
    trap stop_spinner EXIT  # Call stop_spinner() when receiving EXIT signal
    set +m
    {
        while : ; do
            # Ref patterns from: https://github.com/sindresorhus/cli-spinners
            for X in "⠁" "⠂" "⠄" "⡀" "⡈" "⡐" "⡠" "⣀" "⣁" "⣂" "⣄" "⣌" "⣔" "⣤" "⣥" "⣦" "⣮" "⣶" "⣷" "⣿" "⡿" "⠿" "⢟" "⠟" "⡛" "⠛" "⠫" "⢋" "⠋" "⠍" "⡉" "⠉" "⠑" "⠡" "⢁"; do
                echo -en "\r  $X    $1"
                sleep 0.15
            done
        done &
    } 2>/dev/null
    spinner_pid=$!
}

stop_spinner()
{
    { kill -9 $spinner_pid && wait; } 2>/dev/null
    set -m
    echo -en "\033[2K\r"
}

#### Spinner Usage:
# start_spinner "I'm thinking!"
# sleep 100   # Do some work
# stop_spinner