forked from Shiloh/githaven
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
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// +build !forceposix
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package flags
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import (
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"strings"
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)
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// Windows uses a front slash for both short and long options. Also it uses
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// a colon for name/argument delimter.
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const (
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defaultShortOptDelimiter = '/'
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defaultLongOptDelimiter = "/"
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defaultNameArgDelimiter = ':'
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)
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func argumentStartsOption(arg string) bool {
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return len(arg) > 0 && (arg[0] == '-' || arg[0] == '/')
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}
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func argumentIsOption(arg string) bool {
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// Windows-style options allow front slash for the option
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// delimiter.
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if len(arg) > 1 && arg[0] == '/' {
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return true
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}
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if len(arg) > 1 && arg[0] == '-' && arg[1] != '-' {
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return true
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}
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if len(arg) > 2 && arg[0] == '-' && arg[1] == '-' && arg[2] != '-' {
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return true
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}
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return false
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}
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// stripOptionPrefix returns the option without the prefix and whether or
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// not the option is a long option or not.
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func stripOptionPrefix(optname string) (prefix string, name string, islong bool) {
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// Determine if the argument is a long option or not. Windows
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// typically supports both long and short options with a single
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// front slash as the option delimiter, so handle this situation
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// nicely.
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possplit := 0
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if strings.HasPrefix(optname, "--") {
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possplit = 2
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islong = true
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} else if strings.HasPrefix(optname, "-") {
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possplit = 1
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islong = false
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} else if strings.HasPrefix(optname, "/") {
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possplit = 1
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islong = len(optname) > 2
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}
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return optname[:possplit], optname[possplit:], islong
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}
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// splitOption attempts to split the passed option into a name and an argument.
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// When there is no argument specified, nil will be returned for it.
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func splitOption(prefix string, option string, islong bool) (string, string, *string) {
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if len(option) == 0 {
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return option, "", nil
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}
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// Windows typically uses a colon for the option name and argument
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// delimiter while POSIX typically uses an equals. Support both styles,
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// but don't allow the two to be mixed. That is to say /foo:bar and
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// --foo=bar are acceptable, but /foo=bar and --foo:bar are not.
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var pos int
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var sp string
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if prefix == "/" {
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sp = ":"
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pos = strings.Index(option, sp)
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} else if len(prefix) > 0 {
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sp = "="
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pos = strings.Index(option, sp)
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}
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if (islong && pos >= 0) || (!islong && pos == 1) {
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rest := option[pos+1:]
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return option[:pos], sp, &rest
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}
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return option, "", nil
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}
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// addHelpGroup adds a new group that contains default help parameters.
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func (c *Command) addHelpGroup(showHelp func() error) *Group {
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// Windows CLI applications typically use /? for help, so make both
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// that available as well as the POSIX style h and help.
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var help struct {
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ShowHelpWindows func() error `short:"?" description:"Show this help message"`
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ShowHelpPosix func() error `short:"h" long:"help" description:"Show this help message"`
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}
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help.ShowHelpWindows = showHelp
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help.ShowHelpPosix = showHelp
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ret, _ := c.AddGroup("Help Options", "", &help)
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ret.isBuiltinHelp = true
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return ret
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}
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