On Tue, 2005-06-07 at 12:38 -0500, Luc Teirlinck wrote:
> JD Smith wrote:
>
> I just compiled a CVS Emacs v22, and was pleased to find that there is
> a new comint- prompt-read-only variable. However, when I enable that
> variable, I get the following non-desired behavior:
>
> 1. At each prompt, I am warned "Text is read-only".
> 2. All my input is echoed back to me (I use process-echoes).
>
> I thought my prompt pattern could be at fault; it contains a \r
> character (which IDL throws in at odd intervals). I changed it to
> something simple, and get the same behavior.
>
> Unless you set comint-use-prompt-regexp (formerly
> comint-use-prompt-regexp-instead-of-fields) to t, the value of
> shell-prompt-pattern will not matter very much. It looks like part of
> the echoed input is considered part of the prompt. The prompt
> read-only region includes the prompt and the newline before it.
>
> It is really difficult for me to look into this, because I can not
> duplicate the problem. Trying to use idlwave-shell-mode (assuming
> that is what we are talking about) I got:
>
> apply: Searching for program: no such file or directory, idl
I turned on comint-use-prompt-regexp, with the same results. I have
comint-process-echoes set, since IDL echoes input. If I turn it off, I
don't get the "Text is read-only" warning, but of course get the echoed
input. It appears that comint is attempting to delete some of the input
which has already been marked read-only as a result of prompt-read-only.
I've isolated the "Text is read-only" warning to line 1550 of comint.el:
(delete-region comint-last-input-end
(+ comint-last-input-end echo-len)))))
This is in the segment of code which removes the duplicate input echoed.
When process-echoes is set, this gets called, and results in the warning
above. This results because the echoed input has apparently already
been marked read-only, perhaps by having inherited that status from the
prior prompt somehow. Here is an example input which delete-region
failed to delete after having matched it:
#("print,'foo'\n" 0 9 (front-sticky (read-only) read-only t inhibit-
line-move-field-capture t field output rear-nonsticky t) 9 12 (inhibit-
line-move-field-capture t field output rear-nonsticky t))
Thanks,
JD
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