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// Copyright 2013 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package getopt
import (
"fmt"
"runtime"
)
// Value is the interface to the dynamic value stored in a flag. (The default
// value is represented as a string.) Set is passed the string to set the
// value to as well as the Option that is being processed.
type Value interface {
Set(string, Option) error
String() string
}
// Var creates an option of the specified name. The type and value of the option
// are represented by the first argument, of type Value, which typically holds a
// user-defined implementation of Value. All options are ultimately created
// as a Var.
func Var(p Value, name rune, helpvalue ...string) Option {
return CommandLine.VarLong(p, "", name, helpvalue...)
}
func VarLong(p Value, name string, short rune, helpvalue ...string) Option {
return CommandLine.VarLong(p, name, short, helpvalue...)
}
func (s *Set) Var(p Value, name rune, helpvalue ...string) Option {
return s.VarLong(p, "", name, helpvalue...)
}
func (s *Set) VarLong(p Value, name string, short rune, helpvalue ...string) Option {
opt := &option{
short: short,
long: name,
value: p,
defval: p.String(),
}
switch len(helpvalue) {
case 2:
opt.name = helpvalue[1]
fallthrough
case 1:
opt.help = helpvalue[0]
case 0:
default:
panic("Too many strings for String helpvalue")
}
if _, file, line, ok := runtime.Caller(1); ok {
opt.where = fmt.Sprintf("%s:%d", file, line)
}
if opt.short == 0 && opt.long == "" {
fmt.Fprintf(stderr, opt.where+": no short or long option given")
exit(1)
}
s.AddOption(opt)
return opt
}
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