Re: Question about handling file deletion

[Stefan Monnier <monnier@iro.umontreal.ca>]

> E.g. bug#14688.  If you have debug-on-error enabled, you get the two
> backtraces Leo reported (wrong-type-argument due to (find-file-noselect
> nil), followed by file-error "Removing old name" "no such file or
> directory" due to calling delete-file on the file that was already
> deleted).  But if debug-on-error is disabled, you just get "Removing old
> name: no such file or directory, /data/steve/.emacs.d/todo/Todo.todo" in
> the echo area and above it a buffer in Todo mode whose name is the todo
> file you just created.  If you try to add a category, you get
> "find-file-noselect: Wrong type argument: stringp, nil".  If you
> mistakenly think there is a category and try to navigate with `f' or
> `b', you get "todo-forward-category: Arithmetic error"; if you try to
> insert an item with e.g. `i i' you get prompted but after typing the
> item text and hitting RET, you get "todo-basic-insert-item: Args out of
> range: 1, 2".  Similar errors and other odd behavior can occur if you
> leave the Todo mode buffer live after deleting the file, and can arise
> later, after adding more todo files and using other commands.  So I
> guess I have to bite the bullet and make Todo mode catch these errors.

Indeed, these errors seem annoying enough that we should try to handle
it a bit better.


        Stefan