Added convenient Sprint method

Author: peteabre

colprint.go

@@ -10,6 +10,7 @@ import (
 	"math"
 	"sort"
 	"github.com/ryanuber/columnize"
+	"bytes"
 )
 
 const TagName = "colprint"
@@ -27,6 +28,12 @@ type Config struct {
 	// FloatPrecision represents the precision used when printing floats.
 	FloatPrecision *int
 }
+// Sprint is a convenience method for creating a string from a struct or slice of structs using default config
+func Sprint(s interface{}) (string, error) {
+	buf := new(bytes.Buffer)
+	err := Fprint(buf, s)
+	return buf.String(), err
+}
 
 // Print prints a struct or slice of structs to stdout using default config
 func Print(s interface{}) error {

colprint_test.go

@@ -183,7 +183,7 @@ func (s *UnitTests) TestFPrint_PointerArg() {
 	})
 }
 
-func (s *UnitTests) TestPrint_WithComposition() {
+func (s *UnitTests) TestSprint_WithComposition() {
 	type A struct {
 		Name string `colprint:"Name,1"`
 	}
@@ -197,8 +197,9 @@ func (s *UnitTests) TestPrint_WithComposition() {
 		*B `colprint:"=>"`
 		Description string `colprint:"Desc,1"`
 	}
-
-	s.NoError(Print(C{B: &B{Date: "29.03.2017", A: A{Name: "Kari Nordmann"}}, Description:"desc"}))
+	val, err := Sprint(C{B: &B{Date: "29.03.2017", A: A{Name: "Kari Nordmann"}}, Description:"desc"})
+	s.NoError(err)
+	s.NotEmpty(val)
 }
 
 func (s *UnitTests) TestPrint_CompositionWithErrors() {