Update template

templates/skeleton.sh

@@ -100,14 +100,39 @@ define_vars() {                                                 # {{{
 }
 # }}}
 
+is_command_available() {                                        # {{{
+
+	local_command_available_cmd="${1}"
+	debug_prefix="${2:-}"
+
+	## Return False by default
+	return_command_available="1"
+
+	if [ "$(command -v ${local_command_available_cmd})" ]; then
+		debug_message "${debug_prefix}is_command_available − \
+${RED}${local_command_available_cmd}${COLOR_DEBUG} seems present on this host."
+		return_command_available="0"
+	else
+		debug_message "${debug_prefix}is_command_available − \
+${RED}${local_command_available_cmd}${COLOR_DEBUG} is not available on this host."
+		return_command_available="1"
+	fi
+
+	unset local_command_available_cmd
+	unset debug_prefix
+
+	return "${return_command_available}"
+}
+# }}}
+
 main() {                                                        # {{{
 
 	debug_message "--- MAIN BEGIN"
 
-	## If script should not be executed right now {{{
-	### Exit
-	is_script_ok \
-		&& exit 0
+	## If a command is missing {{{
+	### Exit with error message
+	is_command_available "test_me" "| " \
+		|| error_message "No test_me command available. Please install test_me package with your package manager." 01
 	## }}}
 
 	## Define all vars