don't delete target dir if files: are listed

cmd/read_conf.go

@@ -58,7 +58,8 @@ func (conf *copierConf) ToCopierOptions() (*copier.CopyConfig, error) {
 			}
 			return includeRegexp.MatchString(path) && !excludeRegexp.MatchString(path)
 		},
-		Options: conf.Options,
+		Options:     conf.Options,
+		ClearTarget: len(files) == 0,
 	}, nil
 }
 

pkg/copier/copier.go

@@ -26,4 +26,6 @@ type CopyConfig struct {
 	Options map[string]string
 	// TempDir contains the path to write all files.
 	TempDir string
+	// ClearTarget is true if the target directory should be cleared before copying
+	ClearTarget bool
 }

pkg/pasta/run.go

@@ -98,8 +98,12 @@ func Run(ctx context.Context, deps []Dependency, dryRun, keepDirs bool, pastaFil
 	}
 
 	if !dryRun && !keepDirs {
-		// remove all target directories
+		// remove target directories if enabled
 		for _, dep := range deps {
+			if !dep.Option.ClearTarget {
+				continue
+			}
+
 			if err := os.RemoveAll(dep.Target); err != nil {
 				return fmt.Errorf("error removing target directory %v: %v", dep.Target, err)
 			}