Ensure data sub-directories exist

TODO.md

@@ -3,6 +3,7 @@ List of things to add to this project
 
 * CI/CD pipeline
 * Better docs in case others want to use ths for some reason
+* PWA support? I heard it's like installing websites as apps, could be useful!
 * GitHub/Codeberg/whatever mirror for when `faye` (my server) is offline
 * Check export function for improvements
 * *Go* dependency-less? <-- this is a terrible idea

files.go

@@ -41,6 +41,11 @@ func SaveFile(filename string, contents []byte) error {
 			"file", filename)
 		return err
 	}
+	err := os.MkdirAll(path.Dir(filename), 0755) // Create dir in case it doesn't exist yet to avoid errors
+	if err != nil {
+		slog.Error("error creating directory", "error", err, "file", filename)
+		return err
+	}
 	f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
 	if err != nil {
 		slog.Error("error opening/making file",