vnv

#bin/bash
#GLOBAL VARS
GLOBAL_ENV_DIR=$HOME/.envs
MANAGER=`cat $GLOBAL_ENV_DIR/.vars/manager`

#FUNCTIONS
function printhelp {
	printf """
Usage: vnv <command> argument

General Commands:
-c <virtual_env>, --create <virtual_env>		Creates a virtual environment. 
-a <virtual_env>, --activate <virtual_env>		Activates a virtual environment. 
-rm <virtual_env>, --remove <virtual_env>		Removes a virtual environment from the directory.
-d, --deactivate					Deactivates the current virtual environment.
-ls 							List all available virtual environments.
-cp <virtual_env> <new_virtual_env>			Copies an existing virtual environment to a new one.
-h, --help						Shows help for commands.

Settings:
manager							Allows toggle of virtual environment manager 
"""

}
function activate {
	ENV_PATH=$GLOBAL_ENV_DIR/$1
	if [ -z $ENV_PATH ]; then
		echo "Please provide the name of the virtual environment you want to activate"
	elif [ -e "$ENV_PATH" ]; then
		source $ENV_PATH/bin/activate 
	else
		echo "$1 is not a valid virtual environment"
	fi
}

function make {
	if [ -z $1 ]; then
		echo "Please add a name for your virtual environment"
	else
		if [ $MANAGER = "python_venv" ]; then
        		python -m venv $HOME/.envs/$1
		elif [ $MANAGER = "virtualenv" ]; then 
        		virtualenv $HOME/.envs/$1
		fi
	fi
}

function remove {
	ENV_PATH=$GLOBAL_ENV_DIR/$1
	if [ -z $1 ]; then
		echo "add a name for your virtual environment"
	elif [ -e "$ENV_PATH" ]; then
        	rm -r $ENV_PATH
		echo "removed $1 from virtual environments"
	else
		echo "$1 is not a valid virtual environment"
	fi
}
function copy {
	ENV_PATH_1=$GLOBAL_ENV_DIR/$1
	ENV_PATH_2=$GLOBAL_ENV_DIR/$2
	if [ -z $1 ]; then
		echo "add a name for your virtual environment you want to copy from"
	elif [ -z $2 ]; then
		echo "add a name of a virtual environment you want to copy to"
	elif [ -e "$ENV_PATH_1" ]; then
        	cp -r $ENV_PATH_1 $ENV_PATH_2
	else
		echo "$1 is not a valid virtual environment"
	fi
}

function switch_manager {
	    echo $1 > $GLOBAL_ENV_DIR/.vars/manager
	    echo "Your manager is now: $1"
}

function switch_manager_menu {
	printf """Your current manager is:
$MANAGER 

Choose the number of the
virutal environment manager 
you would like to use: 
"""
 
	select num in "virtualenv" "python_venv"; do
	    case $num in
	        virtualenv ) MANAGER="virtualenv" 
			     switch_manager $MANAGER
		             break;;		
	        python_venv ) MANAGER="python_venv" 
			 switch_manager $MANAGER
                         break;;
		* ) echo "Please enter a valid number"
	    esac
	done
}
for arg in "$@"
do
    case $arg in
	-h|--help)
	printhelp
	shift
        ;;
        -ls)
	ls $GLOBAL_ENV_DIR
        shift        
	;;
        -c=*|--create=*)
	NAME=${arg#*=}
	make $NAME
        shift
        ;;
        -c|--create)
	NAME=$2
	make $NAME
        shift
        ;;
        -rm=*|--remove=*)
	NAME=${arg#*=}
	remove $NAME
        shift
        ;;
        -rm|--remove)
	NAME=$2
	remove $NAME
        shift
        ;;
        -a=*|--activate=*)
	VIRTUAL_ENV=${arg#*=}
        activate $VIRTUAL_ENV	
        shift
        ;;
        -a|--activate)
	VIRTUAL_ENV=$2
        activate $VIRTUAL_ENV	
        shift
        ;;
        -d|--deactivate)
        deactivate	
        shift
        ;;
        -cp)
        copy $2 $3	
        shift
        ;;
        manager)
	switch_manager_menu
        shift
        ;;
    esac
done