add convenience method to get the source in string format

arduino/sketch/sketch.go

@@ -43,6 +43,11 @@ func NewItem(itemPath string) (*Item, error) {
 	return &Item{itemPath, source}, nil
 }
 
+// GetSourceStr returns the Source contents in string format
+func (i *Item) GetSourceStr() string {
+	return string(i.Source)
+}
+
 // ItemByPath implements sort.Interface for []Item based on
 // lexicographic order of the path string.
 type ItemByPath []*Item

arduino/sketch/sketch_test.go

@@ -30,6 +30,7 @@ func TestNewItem(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, sketchItem, item.Path)
 	assert.Equal(t, []byte(`#include <testlib.h>`), item.Source)
+	assert.Equal(t, "#include <testlib.h>", item.GetSourceStr())
 
 	item, err = sketch.NewItem("doesnt/exist")
 	assert.Nil(t, item)