1 files changed, 41 insertions, 0 deletions
diff --git a/internal/admin/undo.go b/internal/admin/undo.go
index 24ce9c1..c2ea61d 100644
--- a/internal/admin/undo.go
+++ b/internal/admin/undo.go
@@ -115,6 +115,47 @@ func (us *UndoStack) SetPlayerFileOnlineCheck(fn func(relPath string) bool) {
 	us.playerFileOnlineCheck = fn
 }
 
+// RewritePaths re-prefixes every stored history path under oldPrefix so a
+// directory rename does not leave stale absolute paths behind. Without this
+// a later undo recreates the old directory and writes a duplicate file while
+// the live file stays in the new directory. newPrefix may be empty to leave
+// paths untouched.
+func (us *UndoStack) RewritePaths(oldPrefix, newPrefix string) {
+	if oldPrefix == "" || newPrefix == "" || oldPrefix == newPrefix {
+		return
+	}
+	us.mu.Lock()
+	defer us.mu.Unlock()
+	sep := string(os.PathSeparator)
+	rewrite := func(p string) string {
+		if p == "" {
+			return p
+		}
+		if p == oldPrefix {
+			return newPrefix
+		}
+		if strings.HasPrefix(p, oldPrefix+sep) {
+			return filepath.Join(newPrefix, strings.TrimPrefix(p, oldPrefix+sep))
+		}
+		return p
+	}
+	rewriteDesc := func(c *ChangeDesc) {
+		c.FilePath = rewrite(c.FilePath)
+		c.NewFilePath = rewrite(c.NewFilePath)
+		for i := range c.ExtraFiles {
+			c.ExtraFiles[i].FilePath = rewrite(c.ExtraFiles[i].FilePath)
+			c.ExtraFiles[i].NewFilePath = rewrite(c.ExtraFiles[i].NewFilePath)
+		}
+	}
+	for i := range us.history {
+		rewriteDesc(&us.history[i])
+	}
+	for i := range us.redo {
+		rewriteDesc(&us.redo[i])
+	}
+	us.save()
+}
+
 func (us *UndoStack) Push(desc ChangeDesc) {
 	us.mu.Lock()
 	defer us.mu.Unlock()