✨ Add user management

cmd_user.go

@@ -148,3 +148,26 @@ func (cmd CmdUserDelete) Run(app *app) error {
 	}
 	return nil
 }
+
+func (app *app) deleteUser(username string) error {
+	if err := app.userStore.RemoveUser(username); err != nil {
+		return fmt.Errorf("cannot remove user: %w", err)
+	}
+
+	sharesByUser, err := app.shareStore.FindSharesByUser(username)
+	if err != nil {
+		return fmt.Errorf("cannot get shares of user: %w", err)
+	}
+	allSuccessful := true
+	for _, userShare := range sharesByUser {
+		if err := app.shareStore.RemoveShare(userShare.UUID); err != nil {
+			fmt.Fprintf(os.Stderr, "User %q cannot be removed from Share %q: %v\n", username, userShare.UUID.String(), err)
+			allSuccessful = false
+		}
+	}
+	if !allSuccessful {
+		return fmt.Errorf("could not remove user from all shares")
+	}
+
+	return nil
+}