Add time and Stringer to string handling

2 files changed, 30 insertions, 1 deletions

diff --git a/internal/strings.go b/internal/strings.go
index 9b8b802..8924734 100644
--- a/internal/strings.go
+++ b/internal/strings.go
@@ -3,13 +3,19 @@ package internal
 import (
 	"fmt"
 	"strconv"
+	"time"
 )
 
 // ToString converts interface to string
 func ToString(v interface{}) string {
+	if v == nil {
+		return ""
+	}
 	switch c := v.(type) {
 	case string:
 		return c
+	case *string:
+		return *c
 	case int:
 		return strconv.FormatInt(int64(c), 10)
 	case int64:
@@ -36,6 +42,12 @@ func ToString(v interface{}) string {
 		return strconv.FormatFloat(c, 'g', -1, 64)
 	case bool:
 		return strconv.FormatBool(c)
+	case *bool:
+		return strconv.FormatBool(*c)
+	case *time.Time:
+		return fmt.Sprintf("%s", c)
+	case fmt.Stringer:
+		return c.String()
 	default:
 		return fmt.Sprintf("%v", c)
 	}
diff --git a/internal/strings_test.go b/internal/strings_test.go
index 418ed50..4f1a0c8 100644
--- a/internal/strings_test.go
+++ b/internal/strings_test.go
@@ -2,9 +2,19 @@ package internal
 
 import (
 	"testing"
+	"time"
 )
 
+type stringer struct{}
+
+func (s stringer) String() string {
+	return "I am a stringer"
+}
+
 func TestToString(t *testing.T) {
+	epoch := time.Date(0, 0, 0, 0, 0, 0, 0, time.UTC)
+	s := "string"
+	b := true
 	tests := []struct {
 		in       interface{}
 		expected string
@@ -25,7 +35,14 @@ func TestToString(t *testing.T) {
 		{uint64(30), "30"},
 		{float32(3.0001), "3.0001"},
 		{float64(3.0000001), "3.0000001"},
-		{nil, "<nil>"},
+		{nil, ""},
+		{new(stringer), "I am a stringer"},
+		{epoch, "-0001-11-30 00:00:00 +0000 UTC"},
+		{struct{ string }{"test"}, "{test}"},
+		// Pointers
+		{&s, "string"},
+		{&epoch, "-0001-11-30 00:00:00 +0000 UTC"},
+		{&b, "true"},
 	}
 
 	for _, tt := range tests {