--- /dev/null
+package pflag
+
+import (
+ "bytes"
+ "encoding/csv"
+ "fmt"
+ "strings"
+)
+
+// -- stringToString Value
+type stringToStringValue struct {
+ value *map[string]string
+ changed bool
+}
+
+func newStringToStringValue(val map[string]string, p *map[string]string) *stringToStringValue {
+ ssv := new(stringToStringValue)
+ ssv.value = p
+ *ssv.value = val
+ return ssv
+}
+
+// Format: a=1,b=2
+func (s *stringToStringValue) Set(val string) error {
+ var ss []string
+ n := strings.Count(val, "=")
+ switch n {
+ case 0:
+ return fmt.Errorf("%s must be formatted as key=value", val)
+ case 1:
+ ss = append(ss, strings.Trim(val, `"`))
+ default:
+ r := csv.NewReader(strings.NewReader(val))
+ var err error
+ ss, err = r.Read()
+ if err != nil {
+ return err
+ }
+ }
+
+ out := make(map[string]string, len(ss))
+ for _, pair := range ss {
+ kv := strings.SplitN(pair, "=", 2)
+ if len(kv) != 2 {
+ return fmt.Errorf("%s must be formatted as key=value", pair)
+ }
+ out[kv[0]] = kv[1]
+ }
+ if !s.changed {
+ *s.value = out
+ } else {
+ for k, v := range out {
+ (*s.value)[k] = v
+ }
+ }
+ s.changed = true
+ return nil
+}
+
+func (s *stringToStringValue) Type() string {
+ return "stringToString"
+}
+
+func (s *stringToStringValue) String() string {
+ records := make([]string, 0, len(*s.value)>>1)
+ for k, v := range *s.value {
+ records = append(records, k+"="+v)
+ }
+
+ var buf bytes.Buffer
+ w := csv.NewWriter(&buf)
+ if err := w.Write(records); err != nil {
+ panic(err)
+ }
+ w.Flush()
+ return "[" + strings.TrimSpace(buf.String()) + "]"
+}
+
+func stringToStringConv(val string) (interface{}, error) {
+ val = strings.Trim(val, "[]")
+ // An empty string would cause an empty map
+ if len(val) == 0 {
+ return map[string]string{}, nil
+ }
+ r := csv.NewReader(strings.NewReader(val))
+ ss, err := r.Read()
+ if err != nil {
+ return nil, err
+ }
+ out := make(map[string]string, len(ss))
+ for _, pair := range ss {
+ kv := strings.SplitN(pair, "=", 2)
+ if len(kv) != 2 {
+ return nil, fmt.Errorf("%s must be formatted as key=value", pair)
+ }
+ out[kv[0]] = kv[1]
+ }
+ return out, nil
+}
+
+// GetStringToString return the map[string]string value of a flag with the given name
+func (f *FlagSet) GetStringToString(name string) (map[string]string, error) {
+ val, err := f.getFlagType(name, "stringToString", stringToStringConv)
+ if err != nil {
+ return map[string]string{}, err
+ }
+ return val.(map[string]string), nil
+}
+
+// StringToStringVar defines a string flag with specified name, default value, and usage string.
+// The argument p points to a map[string]string variable in which to store the values of the multiple flags.
+// The value of each argument will not try to be separated by comma
+func (f *FlagSet) StringToStringVar(p *map[string]string, name string, value map[string]string, usage string) {
+ f.VarP(newStringToStringValue(value, p), name, "", usage)
+}
+
+// StringToStringVarP is like StringToStringVar, but accepts a shorthand letter that can be used after a single dash.
+func (f *FlagSet) StringToStringVarP(p *map[string]string, name, shorthand string, value map[string]string, usage string) {
+ f.VarP(newStringToStringValue(value, p), name, shorthand, usage)
+}
+
+// StringToStringVar defines a string flag with specified name, default value, and usage string.
+// The argument p points to a map[string]string variable in which to store the value of the flag.
+// The value of each argument will not try to be separated by comma
+func StringToStringVar(p *map[string]string, name string, value map[string]string, usage string) {
+ CommandLine.VarP(newStringToStringValue(value, p), name, "", usage)
+}
+
+// StringToStringVarP is like StringToStringVar, but accepts a shorthand letter that can be used after a single dash.
+func StringToStringVarP(p *map[string]string, name, shorthand string, value map[string]string, usage string) {
+ CommandLine.VarP(newStringToStringValue(value, p), name, shorthand, usage)
+}
+
+// StringToString defines a string flag with specified name, default value, and usage string.
+// The return value is the address of a map[string]string variable that stores the value of the flag.
+// The value of each argument will not try to be separated by comma
+func (f *FlagSet) StringToString(name string, value map[string]string, usage string) *map[string]string {
+ p := map[string]string{}
+ f.StringToStringVarP(&p, name, "", value, usage)
+ return &p
+}
+
+// StringToStringP is like StringToString, but accepts a shorthand letter that can be used after a single dash.
+func (f *FlagSet) StringToStringP(name, shorthand string, value map[string]string, usage string) *map[string]string {
+ p := map[string]string{}
+ f.StringToStringVarP(&p, name, shorthand, value, usage)
+ return &p
+}
+
+// StringToString defines a string flag with specified name, default value, and usage string.
+// The return value is the address of a map[string]string variable that stores the value of the flag.
+// The value of each argument will not try to be separated by comma
+func StringToString(name string, value map[string]string, usage string) *map[string]string {
+ return CommandLine.StringToStringP(name, "", value, usage)
+}
+
+// StringToStringP is like StringToString, but accepts a shorthand letter that can be used after a single dash.
+func StringToStringP(name, shorthand string, value map[string]string, usage string) *map[string]string {
+ return CommandLine.StringToStringP(name, shorthand, value, usage)
+}
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