Start qutebrowser only if not already running

qb

@@ -7,6 +7,7 @@ readonly NBARGS="${#}"
 [ -z "${DEBUG}" ] && DEBUG=1
 
 ## Colors
+readonly PURPLE='\033[1;35m'
 readonly RED='\033[0;31m'
 readonly RESET='\033[0m'
 readonly COLOR_DEBUG="${PURPLE}"
@@ -34,6 +35,13 @@ OPTIONS :
 
 EOF
 
+}
+# }}}
+define_vars() {                                                 # {{{
+
+	## List of process pattern to monitor
+	qutebrowser_proc_pattern="(qutebrowser)"
+
 }
 # }}}
 debug_message() {                                               # {{{
@@ -46,6 +54,29 @@ 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
@@ -74,7 +105,14 @@ Start qutebrowser from ${RED}Git repository${COLOR_DEBUG}."
 
 main() {                                                        # {{{
 
-	launch_qutebrowser \
+	## 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
 
 }