refactor: urfave v3

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

@@ -0,0 +1,20 @@
+package cli
+
+type (
+	StringSlice     = SliceBase[string, StringConfig, stringValue]
+	StringSliceFlag = FlagBase[[]string, StringConfig, StringSlice]
+)
+
+var NewStringSlice = NewSliceBase[string, StringConfig, stringValue]
+
+// StringSlice looks up the value of a local StringSliceFlag, returns
+// nil if not found
+func (cmd *Command) StringSlice(name string) []string {
+	if v, ok := cmd.Value(name).([]string); ok {
+		tracef("string slice available for flag name %[1]q with value=%[2]v (cmd=%[3]q)", name, v, cmd.Name)
+		return v
+	}
+
+	tracef("string slice NOT available for flag name %[1]q (cmd=%[2]q)", name, cmd.Name)
+	return nil
+}