Start qutebrowser (and argument management)

qb

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+#!/bin/sh
+
+# Vars {{{
+readonly PROGNAME=$(basename "${0}")
+readonly NBARGS="${#}"
+## Test if DEBUG is already defined (by parent script,…)
+[ -z "${DEBUG}" ] && DEBUG=1
+
+## Colors
+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
+        ${PROGNAME}
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    --help
+        Print this help message.
+
+EOF
+
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
+
+	return 0
+}
+# }}}
+
+main() {                                                        # {{{
+
+	# Version with user's venv
+	if [ -f ~/src/qutebrowser-venv/bin/python3 ]; then
+		~/src/qutebrowser-venv/bin/python3 -m qutebrowser
+		exit 0
+	fi
+
+	# Version from APT package
+	if dpkg -l | grep -q qutebrowser ; then
+		command qutebrowser
+		exit 0
+	fi
+
+	# Version from Git repository
+	if [ -f ~/repos/qutebrowser/qutebrowser.py ]; then
+		~/repos/qutebrowser/qutebrowser.py --backend webengine "$@"
+		exit 0
+	fi
+
+}
+# }}}
+
+# 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