AddFlags.

FormatBaseName generates a executable file name under different os based on basename.

NewApp creates a new application instance with applicaiton name, binary name, and initial options.

NewCommand creates a new sub command instance with command name and others options.

PrintSections prints the given names flagsets info in sections.

TerminalSize returns the width and height of the user's process terminal.

WithCommandOptions allows the app to read from the flags from command line.

WithDefaultValidArgs default args validation funciton.

WithNoConfig not support config flag.

WithOptions reads from command line.

WithValidArgs validate the non-flag args.

WordSepNormalizeFunc changes all flags that contain "_" separators.

App base structure for constructs a cli application.

Command a sub command structure of the cli application.

NamedFlagSets stores named flag sets in the order of calling FlagSet.

CmdLineOptioner abstracts configuration options for reading parameters from command line.

CompleteableOptions abstracts options which can be completed.

CommandOption optional parameters for initializing the command.

Option optional parameters for initializing the applicaiton.

RunCommandFunc the app's command startup callback function.

RunCommand the app's startup callback function.