nroff-mode don't auto-fill directives

nroff-mode don't auto-fill directives

[Kevin Ryde]

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This is my idea for not auto-filling nroff directive lines.  I struck it
on a long .URL line (a groff extension).  I think comment lines like .\"
should still auto-fill, as the do now, though they don't actually come
out quite right yet (neither before nor after this change).

2007-10-12  Kevin Ryde  <user42@zip.com.au>

	* textmodes/nroff-mode.el (nroff-mode): Set auto-fill-inhibit-regexp
	so as not to auto-fill on directive lines other than comment
	directives.


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*** nroff-mode.el	14 Sep 2007 10:50:21 +1000	1.35
--- nroff-mode.el	12 Oct 2007 10:51:35 +1000	
***************
*** 127,132 ****
--- 127,141 ----
         (concat "[.']\\|" paragraph-start))
    (set (make-local-variable 'paragraph-separate)
         (concat "[.']\\|" paragraph-separate))
+ 
+   ;; Don't auto-fill directives, since they normally have to be one line,
+   ;; but do auto-fill comments .\" .\# and '''
+   ;; Comment directive pattern would be [.'][ \t]*[\\][#"], and this regexp
+   ;; is everything other than that, so not a backslash (and not a '' as in
+   ;; '''), or a backslash but then not # or "
+   (set (make-local-variable 'auto-fill-inhibit-regexp)
+        "[.'][ \t]*\\([^\\ \t']\\|\\\\[^#\"]\\)")
+ 
    ;; comment syntax added by mit-erl!gildea 18 Apr 86
    (set (make-local-variable 'comment-start) "\\\" ")
    (set (make-local-variable 'comment-start-skip) "\\\\[\"#][ \t]*")

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Re: nroff-mode don't auto-fill directives

[Richard Stallman]

    I think comment lines like .\"
    should still auto-fill, as the do now, though they don't actually come
    out quite right yet (neither before nor after this change).

It is ok for them to auto-fill if they do so in a way that
marks all the lines as comments.  Does it do that?

Otherwise it is better if they don't auto-fill at all.
At least that way they will remain comments.

Can you make that work right, one way or the other?

Re: nroff-mode don't auto-fill directives

[Kevin Ryde]

Richard Stallman <rms@gnu.org> writes:
>
> It is ok for them to auto-fill if they do so in a way that
> marks all the lines as comments.  Does it do that?

Yes.  But it's not as pretty as it could be.  You get say

.\" this is a comment
. \" and this is auto
. \" filled subsequent
. \" comment lines

Nroff is happy with the extra space after the dot, even if you mightn't
want your source looking that way.  Like I say, this is so now with or
without what I propose for non-comment directives.

> Can you make that work right, one way or the other?

I went a few rounds wrestling with comments filling, without yet getting
to how I think it should work.

Re: nroff-mode don't auto-fill directives

[Richard Stallman]

    Yes.  But it's not as pretty as it could be.  You get say

    .\" this is a comment
    . \" and this is auto
    . \" filled subsequent
    . \" comment lines

At least it isn't incorrect.
I was worried that it would produce incorrect input.

So don't worry about it (unless you want to).