add String to Delta struct and use it in logs

Also switch to external package for slice_test as it was already a case
of "black box testing".

1 files changed, 2 insertions, 2 deletions

diff --git a/repo.go b/repo.go
index ec5935d..e5a73ec 100644
--- a/repo.go
+++ b/repo.go
@@ -345,7 +345,7 @@ func slice2fileList(s slice.Slice) (ret []File) {
 func (r *Repo) storeFileList(version int, list []File) {
 	dest := filepath.Join(r.path, fmt.Sprintf(versionFmt, version), filesName)
 	delta := slice.Diff(fileList2slice(r.files), fileList2slice(list))
-	logger.Info("files delta del: ", len(delta.Del), ", ins: ", len(delta.Ins))
+	logger.Infof("files delta %s", delta.String())
 	storeBasicStruct(dest, utils.NopWriteWrapper, delta)
 }
 
@@ -713,7 +713,7 @@ func slice2recipe(s slice.Slice) (ret []Chunk) {
 func (r *Repo) storeRecipe(version int, recipe []Chunk) {
 	dest := filepath.Join(r.path, fmt.Sprintf(versionFmt, version), recipeName)
 	delta := slice.Diff(recipe2slice(r.recipe), recipe2slice(recipe))
-	logger.Info("recipe delta del: ", len(delta.Del), ", ins:", len(delta.Ins))
+	logger.Infof("recipe delta %s", delta.String())
 	storeBasicStruct(dest, utils.NopWriteWrapper, delta)
 }