getopt: init module

getopt/string.go

@@ -0,0 +1,29 @@
+package getopt
+
+type stringVal string
+
+func (s *stringVal) String() string {
+	return string(*s)
+}
+
+func (s *stringVal) Set(val string) error {
+	*s = stringVal(val)
+	return nil
+}
+
+// StringVar defines a string flag with specified name, default value,
+// and usage string. The argument p points to a string variable in which
+// to store the value of the flag.
+func (set *FlagSet) StringVar(p *string, name string, value string, usage string) {
+	*p = value
+	set.Var((*stringVal)(p), name, usage)
+}
+
+// String defines a string flag with specified name, default value, and
+// usage string. The return value is the address of a string variable
+// that stores the value of the flag.
+func (set *FlagSet) String(name string, value string, usage string) *string {
+	var s string
+	set.StringVar(&s, name, value, usage)
+	return &s
+}