module cli const ( BASE_INDENT = 2 ABBREV_INDENT = 5 DESCRIPTION_INDENT = 20 ) fn help_flag() Flag { return Flag{ flag: .bool, name: 'help', abbrev: 'h', description: 'Prints help information', } } fn help_cmd() Command { return Command{ name: 'help', description: 'Prints help information', execute: help_func, parent: 0 } } fn help_func(help_cmd Command) { cmd := help_cmd.parent full_name := cmd.full_name() mut help := '' help += 'Usage: ${full_name}' if cmd.flags.len > 0 { help += ' [FLAGS]'} if cmd.commands.len > 0 { help += ' [COMMANDS]'} help += '\n\n' if cmd.description != '' { help += '${cmd.description}\n\n' } if cmd.flags.len > 0 { help += 'Flags:\n' for flag in cmd.flags { mut flag_name := '' if flag.abbrev != '' { abbrev_indent := ' '.repeat(max(ABBREV_INDENT-(flag.abbrev.len+1), 1)) flag_name = '-${flag.abbrev}${abbrev_indent}--${flag.name}' } else { abbrev_indent := ' '.repeat(max(ABBREV_INDENT-(flag.abbrev.len), 1)) flag_name = '${abbrev_indent}--${flag.name}' } mut required := '' if flag.required { required = ' (required)' } base_indent := ' '.repeat(BASE_INDENT) description_indent := ' '.repeat(max(DESCRIPTION_INDENT-flag_name.len, 1)) help += '${base_indent}${flag_name}${description_indent}${flag.description}${required}\n' } help += '\n' } if cmd.commands.len > 0 { help += 'Commands:\n' for command in cmd.commands { base_indent := ' '.repeat(BASE_INDENT) description_indent := ' '.repeat(max(DESCRIPTION_INDENT-command.name.len, 1)) help += '${base_indent}${command.name}${description_indent}${command.description}\n' } help += '\n' } print(help) } fn max(a, b int) int { return if a > b {a} else {b} }