#!/bin/bash

# righthand script
# Used to wrap custom operations inside one script
#

########################## RH user defined functions ###########################

# all user defined operation starts with "rh_op_" prefix.


############################# RH helper functions ##############################

_rh_try_ret_help()
{
	if [ ! -z $RH_RUNTIME_REQUEST_HELP ]
	then
		echo $1
		exit 1;
	fi
}

_rh_get_universe_name()
{
	if [ ! -z $RH_UNIVERSE_NAME ]
	then
		echo "$RH_UNIVERSE_NAME"
	elif [ -f "$(dirname $0)/.rh_universe_name" ]
	then
		cat "$(dirname $0)/.rh_universe_name"
	else
		echo $(dirname $(readlink -f "$0")) | grep -Po "[^/]+$"
	fi
}

############################ RH built-in functions #############################

rh_op_enter()
{
	_rh_try_ret_help 'Executes new bash shell that include rh command and all neighbor scripts ($PATH injection).'

	export PS1="RH("$(_rh_get_universe_name)"): $(bash -i -c 'echo $PS1') "
	export PATH="$PATH:"$(dirname $(readlink -f "$0"))
	EX="export PS1="$(printf "%q" "$PS1")";"
	EX+="complete -W \"${RH_FUNCTIONS[@]}\" 'rh';"
	exec /bin/bash --init-file <(echo "$EX")
}

rh_op_echo()
{
	_rh_try_ret_help "Test command, echoes back every argument"
	echo "echo in RH: $@"
}

rh_op_help()
{
	_rh_try_ret_help "Returns RH help with the list of all defined functions"

	echo "RH stands for 'right hand'. It is a wrapper script wherein you can collect tiny commands."
	echo "Specify one righthand function from the followings:"

	RH_RUNTIME_REQUEST_HELP=true

	for f in ${RH_FUNCTIONS[@]}
	do
		# if the command has help
		if type "rh_op_"$f | grep -q _rh_try_ret_help
		then
			echo -e "\t$f - "$("rh_op_"$f)
		else
			echo -e "\t$f"
		fi
	done
}

rh_op_print_universe()
{
	_rh_try_ret_help 'Prints the logical name of the RH command repository. You can change by specifying $RH_UNIVERSE_NAME or editing the content of the rh command neighbor file .rh_universe_name'
	echo $(_rh_get_universe_name)
}

############################## Application area ################################

# Collection available commands
RH_FUNCTIONS=()

for func in `declare -F | grep -Po '(?<=rh_op_).*$' | sort`
do
	RH_FUNCTIONS+=($func);
done

# print help if nothing specified

if [ $# '<' '1' ]
then
	rh_op_help
	exit 1
fi

# run command
for f in ${RH_FUNCTIONS[@]}
do
	if [ "$1" "=" "$f" ]
	then
		"rh_op_"$f "${@:2}"
		exit $?
	fi
done

echo "Righthand function $1 not found, so now printing help..."
rh_op_help
exit 1