Nifty unobstrusive log and requirements functions for tiny Taskfile scripts

Taskfile.sh

#!/bin/bash

function main {
    log 'you said:' "$1"
}

# Use stderr to avoid polluting stdout
function log {
    printf "%s\n" "$*" >&2;
}

# Convenient way to fail-fast and be helpful
function requires {
    for cmd in "$@"; do
        if ! command -v "$cmd" &> /dev/null; then
            log "You need '$cmd', try 'brew install $cmd' or whatever."
            exit
        fi
    done
}

# Usage:
#   $ ./script.sh
#   $ ./script.sh main
#   $ ./script.sh log coucou

requires "curl" "jq"

"${@:-main}"