Copy and remove instead of move

Bit safer

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -87,9 +88,32 @@ func main() {
 				return
 			}
 		}
-		err = os.Rename(file, dest)
+
+		filelog.Debug("opening input file")
+		in, err := os.Open(file)
 		if err != nil {
-			filelog.Error("error renaming file: %s", err)
+			filelog.Error("error opening file: %s", err)
+			return
+		}
+		filelog.Debug("opening output file %s", dest)
+		out, err := os.Create(dest)
+		if err != nil {
+			filelog.Error("error creating dest file: %s", err)
+			return
+		}
+		filelog.Info("copying file")
+		_, err = io.Copy(out, in)
+		if err != nil {
+			filelog.Error("error copying file: %s", err)
+			return
+		}
+		in.Close()
+		out.Close()
+
+		filelog.Info("removing original file")
+		err = os.Remove(file)
+		if err != nil {
+			filelog.Error("error removing original file: %s", err)
 			return
 		}
 		filelog.Info("moved to %q", dest)