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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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