refactor: urfave v3

vendor/github.com/urfave/cli/v3/flag_string.go

@@ -0,0 +1,66 @@
+package cli
+
+import (
+	"fmt"
+	"strings"
+)
+
+type StringFlag = FlagBase[string, StringConfig, stringValue]
+
+// StringConfig defines the configuration for string flags
+type StringConfig struct {
+	// Whether to trim whitespace of parsed value
+	TrimSpace bool
+}
+
+// -- string Value
+type stringValue struct {
+	destination *string
+	trimSpace   bool
+}
+
+// Below functions are to satisfy the ValueCreator interface
+
+func (s stringValue) Create(val string, p *string, c StringConfig) Value {
+	*p = val
+	return &stringValue{
+		destination: p,
+		trimSpace:   c.TrimSpace,
+	}
+}
+
+func (s stringValue) ToString(val string) string {
+	if val == "" {
+		return val
+	}
+	return fmt.Sprintf("%q", val)
+}
+
+// Below functions are to satisfy the flag.Value interface
+
+func (s *stringValue) Set(val string) error {
+	if s.trimSpace {
+		val = strings.TrimSpace(val)
+	}
+	*s.destination = val
+	return nil
+}
+
+func (s *stringValue) Get() any { return *s.destination }
+
+func (s *stringValue) String() string {
+	if s.destination != nil {
+		return *s.destination
+	}
+	return ""
+}
+
+func (cmd *Command) String(name string) string {
+	if v, ok := cmd.Value(name).(string); ok {
+		tracef("string available for flag name %[1]q with value=%[2]v (cmd=%[3]q)", name, v, cmd.Name)
+		return v
+	}
+
+	tracef("string NOT available for flag name %[1]q (cmd=%[2]q)", name, cmd.Name)
+	return ""
+}