1 package pflag
2 3 import (
4 "bytes"
5 "encoding/csv"
6 "strings"
7 )
8 9 // -- stringSlice Value
10 type stringSliceValue struct {
11 value *[]string
12 changed bool
13 }
14 15 func newStringSliceValue(val []string, p *[]string) *stringSliceValue {
16 ssv := new(stringSliceValue)
17 ssv.value = p
18 *ssv.value = val
19 return ssv
20 }
21 22 func 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 31 func 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 42 func (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 56 func (s *stringSliceValue) Type() string {
57 return "stringSlice"
58 }
59 60 func (s *stringSliceValue) String() string {
61 str, _ := writeAsCSV(*s.value)
62 return "[" + str + "]"
63 }
64 65 func (s *stringSliceValue) Append(val string) error {
66 *s.value = append(*s.value, val)
67 return nil
68 }
69 70 func (s *stringSliceValue) Replace(val []string) error {
71 *s.value = val
72 return nil
73 }
74 75 func (s *stringSliceValue) GetSlice() []string {
76 return *s.value
77 }
78 79 func 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
89 func (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"}
104 func (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.
109 func (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"}
120 func 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.
125 func 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"}
136 func (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.
143 func (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"}
156 func 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.
161 func StringSliceP(name, shorthand string, value []string, usage string) *[]string {
162 return CommandLine.StringSliceP(name, shorthand, value, usage)
163 }
164