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- // +build !windows forceposix
- package flags
- import (
- "strings"
- )
- const (
- defaultShortOptDelimiter = '-'
- defaultLongOptDelimiter = "--"
- defaultNameArgDelimiter = '='
- )
- func argumentStartsOption(arg string) bool {
- return len(arg) > 0 && arg[0] == '-'
- }
- func argumentIsOption(arg string) bool {
- if len(arg) > 1 && arg[0] == '-' && arg[1] != '-' {
- return true
- }
- if len(arg) > 2 && arg[0] == '-' && arg[1] == '-' && arg[2] != '-' {
- return true
- }
- return false
- }
- // stripOptionPrefix returns the option without the prefix and whether or
- // not the option is a long option or not.
- func stripOptionPrefix(optname string) (prefix string, name string, islong bool) {
- if strings.HasPrefix(optname, "--") {
- return "--", optname[2:], true
- } else if strings.HasPrefix(optname, "-") {
- return "-", optname[1:], false
- }
- return "", optname, false
- }
- // splitOption attempts to split the passed option into a name and an argument.
- // When there is no argument specified, nil will be returned for it.
- func splitOption(prefix string, option string, islong bool) (string, string, *string) {
- pos := strings.Index(option, "=")
- if (islong && pos >= 0) || (!islong && pos == 1) {
- rest := option[pos+1:]
- return option[:pos], "=", &rest
- }
- return option, "", nil
- }
- // addHelpGroup adds a new group that contains default help parameters.
- func (c *Command) addHelpGroup(showHelp func() error) *Group {
- var help struct {
- ShowHelp func() error `short:"h" long:"help" description:"Show this help message"`
- }
- help.ShowHelp = showHelp
- ret, _ := c.AddGroup("Help Options", "", &help)
- ret.isBuiltinHelp = true
- return ret
- }
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