Ihor Radchenko writes:
> Juan Manuel Macías <maciasch...@posteo.net> writes:
>
>> I think the best thing is to rethink the :literal attribute, as I
>> commented at the end of my other email:
>>
>> - without :literal --> verse environment with a more "canonical" syntax.
>>
>> - with :literal --> verse environment seen in the "old (org) style",
>> preserving the blank lines. In that context \vspace does work.
>
> +1
Here is the modified patch.
--
Juan Manuel Macías
https://juanmanuelmacias.com
https://lunotipia.juanmanuelmacias.com
https://gnutas.juanmanuelmacias.com
>From 8c77b42404ef5d96b2944e8e43bbc6c9412ad808 Mon Sep 17 00:00:00 2001
From: Juan Manuel Macias <maciasch...@posteo.net>
Date: Mon, 14 Aug 2023 21:48:58 +0200
Subject: [PATCH] lisp/ox-latex.el: add the `:literal' attribute to verse
block.
* (org-latex-verse-block): now the treatment of blank lines is
consistent with the syntax of the LaTeX `verse' environment, and the
one provided by the `verse' package. If the `:literal' attribute is
used, all blank lines are preserved and exported as
`\vspace*{\baselineskip}', including the blank lines before or after
contents. The rx code has been suggested by Ihor Radchenko, to
improve readability.
* doc/org-manual.org (Verse blocks in LaTeX export): the new feature
is documented.
---
doc/org-manual.org | 18 ++++++++++++++----
lisp/ox-latex.el | 36 +++++++++++++++++++++++++++---------
2 files changed, 41 insertions(+), 13 deletions(-)
diff --git a/doc/org-manual.org b/doc/org-manual.org
index e59efc417..e52792183 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -14425,10 +14425,10 @@ The LaTeX export backend converts horizontal rules by the specified
#+cindex: verse blocks, in @LaTeX{} export
#+cindex: @samp{ATTR_LATEX}, keyword
-The LaTeX export backend accepts four attributes for verse blocks:
-=:lines=, =:center=, =:versewidth= and =:latexcode=. The three first
-require the external LaTeX package =verse.sty=, which is an extension
-of the standard LaTeX environment.
+The LaTeX export backend accepts five attributes for verse blocks:
+=:lines=, =:center=, =:versewidth=, =:latexcode= and =:literal=. The
+three first require the external LaTeX package =verse.sty=, which is
+an extension of the standard LaTeX environment.
- =:lines= :: To add marginal verse numbering. Its value is an
integer, the sequence in which the verses should be numbered.
@@ -14440,6 +14440,16 @@ of the standard LaTeX environment.
verse.
- =:latexcode= :: It accepts any arbitrary LaTeX code that can be
included within a LaTeX =verse= environment.
+- =:literal= :: With value t, all blank lines are preserved and
+ exported as =\vspace*{\baselineskip}=, including the blank lines
+ before or after contents. Note that without the =:literal=
+ attribute, one or more blank lines between stanzas are exported as a
+ single blank line, and any blank lines before or after the content
+ are removed, which is more consistent with the syntax of the LaTeX
+ `verse' environment, and the one provided by the `verse' package.
+ If the =verse= package is loaded, the vertical spacing between all
+ stanzas can be controlled by the global length =\stanzaskip= (see
+ https://www.ctan.org/pkg/verse).
A complete example with Shakespeare's first sonnet:
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 31cad1dc4..d11e3befa 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -4116,10 +4116,11 @@ contextual information."
(let* ((lin (org-export-read-attribute :attr_latex verse-block :lines))
(latcode (org-export-read-attribute :attr_latex verse-block :latexcode))
(cent (org-export-read-attribute :attr_latex verse-block :center))
+ (lit (org-export-read-attribute :attr_latex verse-block :literal))
(attr (concat
- (if cent "[\\versewidth]" "")
- (if lin (format "\n\\poemlines{%s}" lin) "")
- (if latcode (format "\n%s" latcode) "")))
+ (if cent "[\\versewidth]" "")
+ (if lin (format "\n\\poemlines{%s}" lin) "")
+ (if latcode (format "\n%s" latcode) "")))
(versewidth (org-export-read-attribute :attr_latex verse-block :versewidth))
(vwidth (if versewidth (format "\\settowidth{\\versewidth}{%s}\n" versewidth) ""))
(linreset (if lin "\n\\poemlines{0}" "")))
@@ -4128,20 +4129,37 @@ contextual information."
verse-block
;; In a verse environment, add a line break to each newline
;; character and change each white space at beginning of a line
- ;; into a space of 1 em. Also change each blank line with
- ;; a vertical space of 1 em.
+ ;; into a normal space, calculated with `\fontdimen2\font'. One
+ ;; or more blank lines between lines are exported as a single
+ ;; blank line. If the `:lines' attribute is used, the last
+ ;; verse of each stanza ends with the string `\\!', according to
+ ;; the syntax of the `verse' package. The separation between
+ ;; stanzas can be controlled with the length `\stanzaskip', of
+ ;; the aforementioned package. If the `:literal' attribute is
+ ;; used, all blank lines are preserved and exported as
+ ;; `\vspace*{\baselineskip}', including the blank lines before
+ ;; or after CONTENTS.
(format "%s\\begin{verse}%s\n%s\\end{verse}%s"
vwidth
attr
(replace-regexp-in-string
- "^[ \t]+" (lambda (m) (format "\\hspace*{%dem}" (length m)))
+ "^[ \t]+" (lambda (m) (format "\\hspace*{%d\\fontdimen2\\font}" (length m)))
(replace-regexp-in-string
- (concat "^[ \t]*" (regexp-quote org-latex-line-break-safe) "$")
- "\\vspace*{1em}"
+ (if (not lit)
+ (rx-to-string
+ `(seq (group ,org-latex-line-break-safe "\n")
+ (1+ (group line-start (0+ space) ,org-latex-line-break-safe "\n"))))
+ (concat "^[ \t]*" (regexp-quote org-latex-line-break-safe) "$"))
+ (if (not lit)
+ (if lin "\\\\!\n\n" "\n\n")
+ "\\vspace*{\\baselineskip}")
(replace-regexp-in-string
"\\([ \t]*\\\\\\\\\\)?[ \t]*\n"
(concat org-latex-line-break-safe "\n")
- contents nil t)
+ (if (not lit)
+ (concat (org-trim contents t) "\n")
+ contents)
+ nil t)
nil t)
nil t)
linreset)
--
2.41.0
