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// Copyright 2017 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"
"strconv"
)
type counterValue int
func (b *counterValue) Set(value string, opt Option) error {
if value == "" {
*b++
} else {
v, err := strconv.ParseInt(value, 0, strconv.IntSize)
if err != nil {
if e, ok := err.(*strconv.NumError); ok {
switch e.Err {
case strconv.ErrRange:
err = fmt.Errorf("value out of range: %s", value)
case strconv.ErrSyntax:
err = fmt.Errorf("not a valid number: %s", value)
}
}
return err
}
*b = counterValue(v)
}
return nil
}
func (b *counterValue) String() string {
return strconv.Itoa(int(*b))
}
// Counter creates a counting flag stored as an int. Each time the option
// is seen while parsing the value is incremented. The value of the counter
// may be explicitly set by using the long form:
//
// --counter=5
// --c=5
//
// Further instances of the option will increment from the set value.
func Counter(name rune, helpvalue ...string) *int {
var p int
CommandLine.FlagLong((*counterValue)(&p), "", name, helpvalue...).SetFlag()
return &p
}
func (s *Set) Counter(name rune, helpvalue ...string) *int {
var p int
s.FlagLong((*counterValue)(&p), "", name, helpvalue...).SetFlag()
return &p
}
func CounterLong(name string, short rune, helpvalue ...string) *int {
var p int
CommandLine.FlagLong((*counterValue)(&p), name, short, helpvalue...).SetFlag()
return &p
}
func (s *Set) CounterLong(name string, short rune, helpvalue ...string) *int {
var p int
s.FlagLong((*counterValue)(&p), name, short, helpvalue...).SetFlag()
return &p
}
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