1package pflag
2
3import (
4	"bytes"
5	"encoding/csv"
6	"strings"
7)
8
9// -- stringSlice Value
10type stringSliceValue struct {
11	value   *[]string
12	changed bool
13}
14
15func newStringSliceValue(val []string, p *[]string) *stringSliceValue {
16	ssv := new(stringSliceValue)
17	ssv.value = p
18	*ssv.value = val
19	return ssv
20}
21
22func readAsCSV(val string) ([]string, error) {
23	if val == "" {
24		return []string{}, nil
25	}
26	stringReader := strings.NewReader(val)
27	csvReader := csv.NewReader(stringReader)
28	return csvReader.Read()
29}
30
31func writeAsCSV(vals []string) (string, error) {
32	b := &bytes.Buffer{}
33	w := csv.NewWriter(b)
34	err := w.Write(vals)
35	if err != nil {
36		return "", err
37	}
38	w.Flush()
39	return strings.TrimSuffix(b.String(), "\n"), nil
40}
41
42func (s *stringSliceValue) Set(val string) error {
43	v, err := readAsCSV(val)
44	if err != nil {
45		return err
46	}
47	if !s.changed {
48		*s.value = v
49	} else {
50		*s.value = append(*s.value, v...)
51	}
52	s.changed = true
53	return nil
54}
55
56func (s *stringSliceValue) Type() string {
57	return "stringSlice"
58}
59
60func (s *stringSliceValue) String() string {
61	str, _ := writeAsCSV(*s.value)
62	return "[" + str + "]"
63}
64
65func (s *stringSliceValue) Append(val string) error {
66	*s.value = append(*s.value, val)
67	return nil
68}
69
70func (s *stringSliceValue) Replace(val []string) error {
71	*s.value = val
72	return nil
73}
74
75func (s *stringSliceValue) GetSlice() []string {
76	return *s.value
77}
78
79func stringSliceConv(sval string) (interface{}, error) {
80	sval = sval[1 : len(sval)-1]
81	// An empty string would cause a slice with one (empty) string
82	if len(sval) == 0 {
83		return []string{}, nil
84	}
85	return readAsCSV(sval)
86}
87
88// GetStringSlice return the []string value of a flag with the given name
89func (f *FlagSet) GetStringSlice(name string) ([]string, error) {
90	val, err := f.getFlagType(name, "stringSlice", stringSliceConv)
91	if err != nil {
92		return []string{}, err
93	}
94	return val.([]string), nil
95}
96
97// StringSliceVar defines a string flag with specified name, default value, and usage string.
98// The argument p points to a []string variable in which to store the value of the flag.
99// Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly.
100// For example:
101//   --ss="v1,v2" --ss="v3"
102// will result in
103//   []string{"v1", "v2", "v3"}
104func (f *FlagSet) StringSliceVar(p *[]string, name string, value []string, usage string) {
105	f.VarP(newStringSliceValue(value, p), name, "", usage)
106}
107
108// StringSliceVarP is like StringSliceVar, but accepts a shorthand letter that can be used after a single dash.
109func (f *FlagSet) StringSliceVarP(p *[]string, name, shorthand string, value []string, usage string) {
110	f.VarP(newStringSliceValue(value, p), name, shorthand, usage)
111}
112
113// StringSliceVar defines a string flag with specified name, default value, and usage string.
114// The argument p points to a []string variable in which to store the value of the flag.
115// Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly.
116// For example:
117//   --ss="v1,v2" --ss="v3"
118// will result in
119//   []string{"v1", "v2", "v3"}
120func StringSliceVar(p *[]string, name string, value []string, usage string) {
121	CommandLine.VarP(newStringSliceValue(value, p), name, "", usage)
122}
123
124// StringSliceVarP is like StringSliceVar, but accepts a shorthand letter that can be used after a single dash.
125func StringSliceVarP(p *[]string, name, shorthand string, value []string, usage string) {
126	CommandLine.VarP(newStringSliceValue(value, p), name, shorthand, usage)
127}
128
129// StringSlice defines a string flag with specified name, default value, and usage string.
130// The return value is the address of a []string variable that stores the value of the flag.
131// Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly.
132// For example:
133//   --ss="v1,v2" --ss="v3"
134// will result in
135//   []string{"v1", "v2", "v3"}
136func (f *FlagSet) StringSlice(name string, value []string, usage string) *[]string {
137	p := []string{}
138	f.StringSliceVarP(&p, name, "", value, usage)
139	return &p
140}
141
142// StringSliceP is like StringSlice, but accepts a shorthand letter that can be used after a single dash.
143func (f *FlagSet) StringSliceP(name, shorthand string, value []string, usage string) *[]string {
144	p := []string{}
145	f.StringSliceVarP(&p, name, shorthand, value, usage)
146	return &p
147}
148
149// StringSlice defines a string flag with specified name, default value, and usage string.
150// The return value is the address of a []string variable that stores the value of the flag.
151// Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly.
152// For example:
153//   --ss="v1,v2" --ss="v3"
154// will result in
155//   []string{"v1", "v2", "v3"}
156func StringSlice(name string, value []string, usage string) *[]string {
157	return CommandLine.StringSliceP(name, "", value, usage)
158}
159
160// StringSliceP is like StringSlice, but accepts a shorthand letter that can be used after a single dash.
161func StringSliceP(name, shorthand string, value []string, usage string) *[]string {
162	return CommandLine.StringSliceP(name, shorthand, value, usage)
163}
164