From 8c77b42404ef5d96b2944e8e43bbc6c9412ad808 Mon Sep 17 00:00:00 2001 From: Juan Manuel Macias 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