Add .tmplkeep (#16)

Resolves #15

Co-authored-by: jolheiser <john.olheiser@gmail.com>
Reviewed-on: https://gitea.com/jolheiser/tmpl/pulls/16
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
Co-committed-by: John Olheiser <john.olheiser@gmail.com>

registry/registry_test.go

@@ -98,7 +98,8 @@ func setupTemplate() {
 	if err := os.MkdirAll(pkgPath, os.ModePerm); err != nil {
 		panic(err)
 	}
-	fi, err = os.Create(filepath.Join(pkgPath, ".keep"))
+	// .tmplkeep file
+	fi, err = os.Create(filepath.Join(pkgPath, ".tmplkeep"))
 	if err != nil {
 		panic(err)
 	}

registry/template.go

@@ -85,6 +85,11 @@ func (t *Template) Execute(dest string, defaults, overwrite bool) error {
 			return err
 		}
 
+		// Skip .tmplkeep files, after creating the directory structure
+		if strings.EqualFold(walkInfo.Name(), ".tmplkeep") {
+			return nil
+		}
+
 		oldFi, err := os.Lstat(walkPath)
 		if err != nil {
 			return err

registry/template_test.go

@@ -72,6 +72,13 @@ func testExecute(t *testing.T) {
 		t.FailNow()
 	}
 
+	// Check for .tmplkeep
+	tmplKeep := filepath.Join(pkgPath, ".tmplkeep")
+	if _, err := os.Lstat(tmplKeep); err == nil {
+		t.Logf(".tmplkeep files should NOT be retained upon execution: %s\n", tmplKeep)
+		t.FailNow()
+	}
+
 	// Change file to test non-overwrite
 	if err := ioutil.WriteFile(testPath, []byte(tmplNewGold), os.ModePerm); err != nil {
 		t.Logf("could not write file: %v\n", err)