Shell script to quickly create an invoke task (stub)

mktask.sh

mktask () {
	name=$1
	cmd="${@:2}"
	preamble="import os\nimport sys\nfrom invoke import task"

	if [ -z $cmd ]
	then
		echo "mktask <name> <cmd with any args>"
		return 0
	fi

  # create tasks file if not present
	test -f tasks.py || (echo $preamble >> tasks.py)
  
  # add new task
	\cat <<EOF >> tasks.py

@task
def $name(c):
    c.run(f"$cmd", echo=True, pty=True)
EOF
  # finally, open last line of the file with proper editor
	$EDITOR tasks.py +
}