109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
// +build !forceposix
|
|
|
|
package flags
|
|
|
|
import (
|
|
"strings"
|
|
)
|
|
|
|
// Windows uses a front slash for both short and long options. Also it uses
|
|
// a colon for name/argument delimter.
|
|
const (
|
|
defaultShortOptDelimiter = '/'
|
|
defaultLongOptDelimiter = "/"
|
|
defaultNameArgDelimiter = ':'
|
|
)
|
|
|
|
func argumentStartsOption(arg string) bool {
|
|
return len(arg) > 0 && (arg[0] == '-' || arg[0] == '/')
|
|
}
|
|
|
|
func argumentIsOption(arg string) bool {
|
|
// Windows-style options allow front slash for the option
|
|
// delimiter.
|
|
if len(arg) > 1 && arg[0] == '/' {
|
|
return true
|
|
}
|
|
|
|
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) {
|
|
// Determine if the argument is a long option or not. Windows
|
|
// typically supports both long and short options with a single
|
|
// front slash as the option delimiter, so handle this situation
|
|
// nicely.
|
|
possplit := 0
|
|
|
|
if strings.HasPrefix(optname, "--") {
|
|
possplit = 2
|
|
islong = true
|
|
} else if strings.HasPrefix(optname, "-") {
|
|
possplit = 1
|
|
islong = false
|
|
} else if strings.HasPrefix(optname, "/") {
|
|
possplit = 1
|
|
islong = len(optname) > 2
|
|
}
|
|
|
|
return optname[:possplit], optname[possplit:], islong
|
|
}
|
|
|
|
// 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) {
|
|
if len(option) == 0 {
|
|
return option, "", nil
|
|
}
|
|
|
|
// Windows typically uses a colon for the option name and argument
|
|
// delimiter while POSIX typically uses an equals. Support both styles,
|
|
// but don't allow the two to be mixed. That is to say /foo:bar and
|
|
// --foo=bar are acceptable, but /foo=bar and --foo:bar are not.
|
|
var pos int
|
|
var sp string
|
|
|
|
if prefix == "/" {
|
|
sp = ":"
|
|
pos = strings.Index(option, sp)
|
|
} else if len(prefix) > 0 {
|
|
sp = "="
|
|
pos = strings.Index(option, sp)
|
|
}
|
|
|
|
if (islong && pos >= 0) || (!islong && pos == 1) {
|
|
rest := option[pos+1:]
|
|
return option[:pos], sp, &rest
|
|
}
|
|
|
|
return option, "", nil
|
|
}
|
|
|
|
// addHelpGroup adds a new group that contains default help parameters.
|
|
func (c *Command) addHelpGroup(showHelp func() error) *Group {
|
|
// Windows CLI applications typically use /? for help, so make both
|
|
// that available as well as the POSIX style h and help.
|
|
var help struct {
|
|
ShowHelpWindows func() error `short:"?" description:"Show this help message"`
|
|
ShowHelpPosix func() error `short:"h" long:"help" description:"Show this help message"`
|
|
}
|
|
|
|
help.ShowHelpWindows = showHelp
|
|
help.ShowHelpPosix = showHelp
|
|
|
|
ret, _ := c.AddGroup("Help Options", "", &help)
|
|
ret.isBuiltinHelp = true
|
|
|
|
return ret
|
|
}
|