Refactor model into separate package

model/tempname.go

@@ -0,0 +1,33 @@
+// +build !windows
+
+package model
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+type tempNamer struct {
+	prefix string
+}
+
+var defTempNamer = tempNamer{".syncthing"}
+
+func (t tempNamer) IsTemporary(name string) bool {
+	return strings.HasPrefix(filepath.Base(name), t.prefix)
+}
+
+func (t tempNamer) TempName(name string) string {
+	tdir := filepath.Dir(name)
+	tname := fmt.Sprintf("%s.%s", t.prefix, filepath.Base(name))
+	return filepath.Join(tdir, tname)
+}
+
+func (t tempNamer) Hide(path string) error {
+	return nil
+}
+
+func (t tempNamer) Show(path string) error {
+	return nil
+}