Scott Baker | 1fe7273 | 2019-10-21 10:58:51 -0700 | [diff] [blame] | 1 | // +build !windows forceposix |
| 2 | |
| 3 | package flags |
| 4 | |
| 5 | import ( |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | const ( |
| 10 | defaultShortOptDelimiter = '-' |
| 11 | defaultLongOptDelimiter = "--" |
| 12 | defaultNameArgDelimiter = '=' |
| 13 | ) |
| 14 | |
| 15 | func argumentStartsOption(arg string) bool { |
| 16 | return len(arg) > 0 && arg[0] == '-' |
| 17 | } |
| 18 | |
| 19 | func argumentIsOption(arg string) bool { |
| 20 | if len(arg) > 1 && arg[0] == '-' && arg[1] != '-' { |
| 21 | return true |
| 22 | } |
| 23 | |
| 24 | if len(arg) > 2 && arg[0] == '-' && arg[1] == '-' && arg[2] != '-' { |
| 25 | return true |
| 26 | } |
| 27 | |
| 28 | return false |
| 29 | } |
| 30 | |
| 31 | // stripOptionPrefix returns the option without the prefix and whether or |
| 32 | // not the option is a long option or not. |
| 33 | func stripOptionPrefix(optname string) (prefix string, name string, islong bool) { |
| 34 | if strings.HasPrefix(optname, "--") { |
| 35 | return "--", optname[2:], true |
| 36 | } else if strings.HasPrefix(optname, "-") { |
| 37 | return "-", optname[1:], false |
| 38 | } |
| 39 | |
| 40 | return "", optname, false |
| 41 | } |
| 42 | |
| 43 | // splitOption attempts to split the passed option into a name and an argument. |
| 44 | // When there is no argument specified, nil will be returned for it. |
| 45 | func splitOption(prefix string, option string, islong bool) (string, string, *string) { |
| 46 | pos := strings.Index(option, "=") |
| 47 | |
| 48 | if (islong && pos >= 0) || (!islong && pos == 1) { |
| 49 | rest := option[pos+1:] |
| 50 | return option[:pos], "=", &rest |
| 51 | } |
| 52 | |
| 53 | return option, "", nil |
| 54 | } |
| 55 | |
| 56 | // addHelpGroup adds a new group that contains default help parameters. |
| 57 | func (c *Command) addHelpGroup(showHelp func() error) *Group { |
| 58 | var help struct { |
| 59 | ShowHelp func() error `short:"h" long:"help" description:"Show this help message"` |
| 60 | } |
| 61 | |
| 62 | help.ShowHelp = showHelp |
| 63 | ret, _ := c.AddGroup("Help Options", "", &help) |
| 64 | ret.isBuiltinHelp = true |
| 65 | |
| 66 | return ret |
| 67 | } |