1package pflag
2
3import (
4	"fmt"
5	"net"
6	"strings"
7)
8
9// IPNet adapts net.IPNet for use as a flag.
10type ipNetValue net.IPNet
11
12func (ipnet ipNetValue) String() string {
13	n := net.IPNet(ipnet)
14	return n.String()
15}
16
17func (ipnet *ipNetValue) Set(value string) error {
18	_, n, err := net.ParseCIDR(strings.TrimSpace(value))
19	if err != nil {
20		return err
21	}
22	*ipnet = ipNetValue(*n)
23	return nil
24}
25
26func (*ipNetValue) Type() string {
27	return "ipNet"
28}
29
30func newIPNetValue(val net.IPNet, p *net.IPNet) *ipNetValue {
31	*p = val
32	return (*ipNetValue)(p)
33}
34
35func ipNetConv(sval string) (interface{}, error) {
36	_, n, err := net.ParseCIDR(strings.TrimSpace(sval))
37	if err == nil {
38		return *n, nil
39	}
40	return nil, fmt.Errorf("invalid string being converted to IPNet: %s", sval)
41}
42
43// GetIPNet return the net.IPNet value of a flag with the given name
44func (f *FlagSet) GetIPNet(name string) (net.IPNet, error) {
45	val, err := f.getFlagType(name, "ipNet", ipNetConv)
46	if err != nil {
47		return net.IPNet{}, err
48	}
49	return val.(net.IPNet), nil
50}
51
52// IPNetVar defines an net.IPNet flag with specified name, default value, and usage string.
53// The argument p points to an net.IPNet variable in which to store the value of the flag.
54func (f *FlagSet) IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string) {
55	f.VarP(newIPNetValue(value, p), name, "", usage)
56}
57
58// IPNetVarP is like IPNetVar, but accepts a shorthand letter that can be used after a single dash.
59func (f *FlagSet) IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string) {
60	f.VarP(newIPNetValue(value, p), name, shorthand, usage)
61}
62
63// IPNetVar defines an net.IPNet flag with specified name, default value, and usage string.
64// The argument p points to an net.IPNet variable in which to store the value of the flag.
65func IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string) {
66	CommandLine.VarP(newIPNetValue(value, p), name, "", usage)
67}
68
69// IPNetVarP is like IPNetVar, but accepts a shorthand letter that can be used after a single dash.
70func IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string) {
71	CommandLine.VarP(newIPNetValue(value, p), name, shorthand, usage)
72}
73
74// IPNet defines an net.IPNet flag with specified name, default value, and usage string.
75// The return value is the address of an net.IPNet variable that stores the value of the flag.
76func (f *FlagSet) IPNet(name string, value net.IPNet, usage string) *net.IPNet {
77	p := new(net.IPNet)
78	f.IPNetVarP(p, name, "", value, usage)
79	return p
80}
81
82// IPNetP is like IPNet, but accepts a shorthand letter that can be used after a single dash.
83func (f *FlagSet) IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet {
84	p := new(net.IPNet)
85	f.IPNetVarP(p, name, shorthand, value, usage)
86	return p
87}
88
89// IPNet defines an net.IPNet flag with specified name, default value, and usage string.
90// The return value is the address of an net.IPNet variable that stores the value of the flag.
91func IPNet(name string, value net.IPNet, usage string) *net.IPNet {
92	return CommandLine.IPNetP(name, "", value, usage)
93}
94
95// IPNetP is like IPNet, but accepts a shorthand letter that can be used after a single dash.
96func IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet {
97	return CommandLine.IPNetP(name, shorthand, value, usage)
98}
99