Commit a1f257d8 authored by Marcin Borkowski's avatar Marcin Borkowski

Add the function `fill-polish-nobreak-p'

* lisp/textmodes/fill.el (fill-polish-nobreak-p): Prevent
line-breaking after a single-letter word even if this word is not
preceded by a space.  Fixes bug #20871.
parent 5af5df1f
......@@ -636,8 +636,11 @@ line. If a function returns a non-@code{nil} value, Emacs will not
break the line there. Functions you can use there include:
@code{fill-single-word-nobreak-p} (don't break after the first word of
a sentence or before the last); @code{fill-single-char-nobreak-p}
(don't break after a one-letter word); and @code{fill-french-nobreak-p}
(don't break after @samp{(} or before @samp{)}, @samp{:} or @samp{?}).
(don't break after a one-letter word preceded by a whitespace
character); @code{fill-french-nobreak-p} (don't break after @samp{(}
or before @samp{)}, @samp{:} or @samp{?}); and
@code{fill-polish-nobreak-p} (don't break after a one letter word,
even if preceded by a non-whitespace character).
@node Fill Prefix
@subsection The Fill Prefix
......
......@@ -69,6 +69,11 @@ detect built-in libxml support, instead of testing for that
indirectly, e.g., by checking that functions like
'libxml-parse-html-region' return nil.
+++
** New function 'fill-polish-nobreak-p', to be used in 'fill-nobreak-predicate'.
It blocks line breaking after a one-letter word, also in the case when
this word is preceded by a non-space, but non-alphanumeric character.
* Editing Changes in Emacs 27.1
......
......@@ -339,6 +339,18 @@ places."
(and (memq (preceding-char) '(?\t ?\s))
(eq (char-syntax (following-char)) ?w)))))))
(defun fill-polish-nobreak-p ()
"Return nil if Polish style allows breaking the line at point.
This function may be used in the `fill-nobreak-predicate' hook.
It is almost the same as `fill-single-char-nobreak-p', with the
exception that it does not require the one-letter word to be
preceded by a space. This blocks line-breaking in cases like
\"(a jednak)\"."
(save-excursion
(skip-chars-backward " \t")
(backward-char 2)
(looking-at "[^[:alpha:]]\\cl")))
(defun fill-single-char-nobreak-p ()
"Return non-nil if a one-letter word is before point.
This function is suitable for adding to the hook `fill-nobreak-predicate',
......
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