1 files changed, 25 insertions, 0 deletions
diff --git a/parse.go b/parse.go
index a47f464..a82e377 100644
--- a/parse.go
+++ b/parse.go
@@ -1,12 +1,15 @@
 package arg
 
 import (
+	"encoding"
 	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
+
+	scalar "github.com/alexflint/go-scalar"
 )
 
 // spec represents a command line option
@@ -442,3 +445,25 @@ func canParse(t reflect.Type) (parseable, boolean, multiple bool) {
 
 	return false, false, false
 }
+
+var textUnmarshalerType = reflect.TypeOf([]encoding.TextUnmarshaler{}).Elem()
+
+// isScalar returns true if the type can be parsed from a single string
+func isScalar(t reflect.Type) (parseable, boolean bool) {
+	parseable = scalar.CanParse(t)
+	switch {
+	case t.Implements(textUnmarshalerType):
+		return parseable, false
+	case t.Kind() == reflect.Bool:
+		return parseable, true
+	case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Bool:
+		return parseable, true
+	default:
+		return parseable, false
+	}
+}
+
+// set a value from a string
+func setScalar(v reflect.Value, s string) error {
+	return scalar.ParseValue(v, s)
+}