Template for bootstrap script for any project

run

#!/bin/bash

SCRIPT_DIR="$(dirname "$(readlink -f "${BASH_SOURCE}")")"
# ----------------- START OF THE USER FUNCTIONS SECTION -----------------

my_first_command_help() {
    echo "Build project"
}
my_first_command() { ## It is my first command
    echo "doing something important"
}

# ----------------- END OF THE USER FUNCTIONS SECTION -----------------
# Render help message according to comments for functions
__help() {
    echo "Usage: $BASH_SOURCE [COMMAND] [arg1 arg2 ...]"
    echo "Available commands:"
    grep -Eo "^(.*)\(\)(.*)\#\#(.*)$" $BASH_SOURCE | sort | awk 'BEGIN { FS = "\\\(\\\).*## " } { printf "\033[36m%-30s\033[0m %s\n", $1, $2  }'
}

# Check function existing
__function_exists() {
    declare -f -F "$1" > /dev/null
    return $?
}

# Check if function exists and run it
if __function_exists "$1"; then
    if [ "--help" = "${@:2}" ]; then
        help_func=$1"_help"
        if __function_exists $help_func; then
            $help_func
        else
            echo "Function '$1' does not have help message"
        fi
    else
        $1 "${@:2}"
    fi
else
    __help
fi

1. cd path-to-script-dir/
2. chmod +x ./run - allow execute the script
3. ./run help - get help message
4. ./run my_first_command - execute command sample

For new commands you need add this data (carefully check all spaces and # symbols):

my_second_command_help() {
    echo "Build project"
}
my_second_command() { ## It is my second command
    echo "doing something VERY important"
}

Function with _help suffix not required, you can skip it if you do not need extra documenting for command.