David> Uwe Brauer <oub(a)mat.ucm.es&gt; writes: David> So cut down any changes to 150 characters here. Thanks did not know about that one. Lets see whether I can manage.

Uwe> Thanks did not know about that one. Lets see whether I can Uwe> manage. sjt> For your use case, David's suggestion is far better than mine (I sjt> focused on the "file" in "buffer/file"). Something very simple like sjt> (defvar uwe-message-limit 155) sjt> (lambda (&rest ignored) ; you may need to have correct sjt> ; dummy arguments here sjt> (when (> (buffer-size) uwe-message-limit) sjt> (warn "The message buffer has %d characters. sjt> You should reduce it to %d characters or less." sjt> (buffer-size) uwe-message-limit))) Thanks for that. Right your suggestion only worked (as the name of the hook indicated), when saving a file, while David's suggestion should work when changes in buffer a performed. However somehow that hook did not work for me, so I circumvent that difficulty by using the post-command-hook. This reminds me that the old refill.el from Bob Glickstein also used the after-change-functions hook and that made his code (at that time some 10 years ago) quite slow. On the other hand Per Abrahamsen's maniac.el uses post-command-hook and that code runs smoothly. Per even stated that he should use the after-change-functions but he did not get it to work. Another point, as the function is now, only a warning is released when more that 155 chars a typed. Is there any possibility that (X)Emacs would just refuse any more char. (I thought of using the error Funktion but even then I can continue typing.) Thanks Uwe

Uwe> Hello Is there any possibility that a given buffer/file only Uwe> admits say 150 chars but not more? Yes. See the variables `write-file-hooks' and `local-write-file-hooks'. You would put something like (lambda () (> (buffer-size) 150)) on `local-write-file-hook' with `add-hook'. The function for `write-file-hooks' would have to be more complex, as it would need to check which buffers it applies to somehow. You might also want to call `set-buffer-modified-p' appropriately, and probably `warn' or `error' to tell the user that the maximum file size had been exceeded. I'd need to know more about the use case to say more about what you *should* do (which hook to use, how to make it convenient, etc), but that should give you an idea of *how* to do it. -- School of Systems and Information Engineering http://turnbull.sk.tsukuba.ac.jp University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Ask not how you can "do" free software business; ask what your business can "do for" free software.

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