MainHelpTemplate if the template for 'help' used by most commands.

MainUsageTemplate if the template for 'usage' used by most commands.

NewHelpFlagPrinter will initialize a HelpFlagPrinter given the i/o writer.

OptionsHelpTemplate if the template for 'help' used by the 'options' command.

OptionsUsageTemplate if the template for 'usage' used by the 'options' command.

SectionAliases is the help template section that displays command aliases.

SectionExamples is the help template section that displays command examples.

SectionFlags is the help template section that displays the command's flags.

SectionPersistentFlags is the help template section that displays the command's persistent flags.

SectionSubcommands is the help template section that displays the command's subcommands.

SectionTipsGlobalOptions is the help template section that displays the 'options' hint for displaying global flags.

SectionTipsHelp is the help template section that displays the '--help' hint.

SectionUsage is the help template section that displays the command's usage.

SectionVars is the help template section that declares variables to be used in the template.

HelpFlagPrinter is a printer that processes the help flag and print it to i/o writer.