run.go | 11 -----------
 tmp.go | 37 +++++++++++++++++++++++++++++++++++++

diff --git a/run.go b/run.go
index 32c28f3deadb87a37aed0081bbf3e0cc1585b982e02b16688151c7b220890627..065aadc8f5cb3c0e906eb13d797dc9c6a7729098d4e1e62146a69019447021f5 100644
--- a/run.go
+++ b/run.go
@@ -29,7 +29,6 @@ 	"io"
 	"os"
 	"os/exec"
 	"path"
-	"strconv"
 	"strings"
 	"sync"
 	"syscall"
@@ -100,16 +99,6 @@ 	if _, err := os.Stat(pth); err == nil {
 		return nil
 	}
 	return os.MkdirAll(pth, os.FileMode(0777))
-}
-
-func tempsuffix() string {
-	return strconv.FormatInt((time.Now().UnixNano()+int64(os.Getpid()))&0xFFFFFFFF, 16)
-}
-
-func tempfile(dir, prefix string) (*os.File, error) {
-	// It respects umask, unlike ioutil.TempFile
-	name := path.Join(dir, TmpPrefix+prefix+"."+tempsuffix())
-	return os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, os.FileMode(0666))
 }
 
 func isModified(cwd, redoDir, tgt string) (bool, string, error) {
diff --git a/tmp.go b/tmp.go
new file mode 100644
index 0000000000000000000000000000000000000000..4d13c3d63c6df4a5f85dddafb5b5d70c8e80820ec813bfd4c02002fc319abaea
--- /dev/null
+++ b/tmp.go
@@ -0,0 +1,37 @@
+/*
+goredo -- redo implementation on pure Go
+Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// Temporary files
+
+package main
+
+import (
+	"os"
+	"path"
+	"strconv"
+	"time"
+)
+
+func tempsuffix() string {
+	return strconv.FormatInt((time.Now().UnixNano()+int64(os.Getpid()))&0xFFFFFFFF, 16)
+}
+
+func tempfile(dir, prefix string) (*os.File, error) {
+	// It respects umask, unlike ioutil.TempFile
+	name := path.Join(dir, TmpPrefix+prefix+"."+tempsuffix())
+	return os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, os.FileMode(0666))
+}