scripts/qb

#!/bin/sh

# Vars {{{
readonly PROGNAME=$(basename "${0}")
readonly NBARGS="${#}"
## Test if DEBUG is already defined (by parent script,…)
[ -z "${DEBUG}" ] && DEBUG=1

## Colors
readonly PURPLE='\033[1;35m'
readonly RED='\033[0;31m'
readonly RESET='\033[0m'
readonly COLOR_DEBUG="${PURPLE}"
# }}}
usage() {                                                       # {{{

	cat <<- EOF
usage: $PROGNAME [--debug,--help]

Try to launch the most appropriate qutebrowser binary :
  1. From venv
  2. From APT package
  3. From Git repository

EXAMPLES :
    - Launch qutebrowser
        ${PROGNAME}

OPTIONS :
    -d,--debug
        Enable debug messages.

    --help
        Print this help message.

EOF

}
# }}}
define_vars() {                                                 # {{{

	## List of process pattern to monitor
	qutebrowser_proc_pattern="(qutebrowser)"

}
# }}}
debug_message() {                                               # {{{

	local_debug_message="${1}"

	## Print message if DEBUG is enable (=0)
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"

	return 0
}
# }}}
is_proc_running() {                                             # {{{

	local_proc_pattern="${1}"

	local_count_proc_pattern="$(pgrep -f -- "${local_proc_pattern}" | wc -l)"

	case "${local_count_proc_pattern}" in
		0 ) ## No procs related to this pattern are running
			return_proc_running="1"
			;;
		* ) ## At least one proc seems running
			return_proc_running="0"
			;;
esac

	## Simple debug message to valid current variables
	debug_message "is_proc_running − \
procs running (with the pattern: ${RED}${local_proc_pattern}${COLOR_DEBUG}) on the current host: ${RED}${local_count_proc_pattern}${COLOR_DEBUG}."

	return "${return_proc_running}"

}
# }}}
launch_qutebrowser() {                                          # {{{

	# Version with user's venv
	if [ -f ~/src/qutebrowser-venv/bin/python3 ]; then
		debug_message "launch_qutebrowser − \
Start qutebrowser from ${RED}venv${COLOR_DEBUG}."
		~/src/qutebrowser-venv/bin/python3 -m qutebrowser
	fi

	# Version from APT package
	if dpkg -l | grep -q qutebrowser ; then
		debug_message "launch_qutebrowser − \
Start qutebrowser from ${RED}package${COLOR_DEBUG}."
		command qutebrowser
	fi

	# Version from Git repository
	if [ -f ~/repos/qutebrowser/qutebrowser.py ]; then
		debug_message "launch_qutebrowser − \
Start qutebrowser from ${RED}Git repository${COLOR_DEBUG}."
		~/repos/qutebrowser/qutebrowser.py --backend webengine
	fi

}
# }}}

main() {                                                        # {{{

	## Define all vars according the selected options
	define_vars

		## If nothing related to Qutebrowser is currently running
		### Try to start qutebrowser
		### Then exit with success
	is_proc_running "${qutebrowser_proc_pattern}" \
		|| launch_qutebrowser \
		&& exit 0

}
# }}}

# Manage arguments                                                # {{{

## If there is argument(s)
if [ ! "${NBARGS}" -eq "0" ]; then

	manage_arg="0"

	# Parse all options (start with a "-") one by one
	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do

	case "${1}" in
		-d|--debug )            ## Enable debug mode
			## Enable DEBUG
			DEBUG="0"
			;;
		-h|--help )            ## help
			usage
			## Exit after help informations
			exit 0
			;;
		* )                    ## unknow option
			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
			printf '%b\n' "---"
			usage
			exit 1
			;;
	esac

	debug_message "Arguments management − \
${RED}${1}${COLOR_DEBUG} option managed."

	## Move to the next argument
	shift
	manage_arg=$((manage_arg+1))

	done

	debug_message "Arguments management − \
${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
else
	debug_message "Arguments management − \
No arguments/options to manage."
fi

# }}}

main

exit 255