Errors codes

The following is the list of the errors codes defined by FLAP:

• error = -2: print help status;
• error = -1: print version status;
• error = 0 : no errors occurred;
• error = 1 : an optional CLA has been added without a default value;
• error = 2 : a required CLA cannot exclude others;
• error = 3 : a positional CLA cannot exclude others;
• error = 4 : a named CLA has been added without a switch name;
• error = 5 : a positional CLA has been added without a position;
• error = 6 : a positional CLA has been added without specifying action 'store';
• error = 7 : the CLA value passed is out of the specified choices;
• error = 8 : a required CLA is missing;
• error = 9 : two mutually exclusive CLAs have been passed;
• error = 10: error happens casting CLA value to logical type;
• error = 11: error happens adding choices check for CLA value of logical type;
• error = 12: actual CLA is not list-values (multi-valued);
• error = 13: list-values CLA has been passed with insufficient arguments;
• error = 14: missing value of CLA;
• error = 15: unknown CLA (switch name) has been passed;
• error = 16: envvar not allowed for positional CLA;
• error = 17: envvar not allowed action different from store;
• error = 18: envvar not allowed for list-values CLA;
• error = 19: action store* not allowed for positional CLA;
• error = 20: action store* not allowed for list-values CLA;
• error = 21: action store* not allowed for environment variable CLA;
• error = 22: unknown CLA action has been passed;
• error = 23: CLAs group (command) consistency is broken;
• error = 24: two mutually exclusive CLAs group (commands) have been passed;
• error = 25: CLA not found in CLI;
• error = 26: CLAs group (command) not found in CLI;
• error = 27: CLA selection in CLI failing;
• error = 28: insufficient arguments for CLI.