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* [patch] A proposal to add LaTeX attributes to verse blocks
@ 2020-12-17 17:11 Juan Manuel Macías
  2021-01-03 10:22 ` TEC
  0 siblings, 1 reply; 7+ messages in thread
From: Juan Manuel Macías @ 2020-12-17 17:11 UTC (permalink / raw)
  To: orgmode


[-- Attachment #1.1: Type: text/plain, Size: 4802 bytes --]

Hi,

I would like to propose this patch to add some LaTeX attributes to verse blocks,
especially to be able to apply certain features from the verse.sty package, which is an
extension (widely used in Humanities) of the standard LaTeX 'verse'
environment (see https://www.ctan.org/pkg/verse).

These attributes would be:

- `:lines' to add verse numbers, according to any numbering sequence

- `:center' to apply the optical centering of the poem, which is a typographic convention
  whereby a poem or a group of verses is centered (as a 'block') on the page, taking the width of the
  longest verse as a reference. In fact, optical centering is the correct arrangement of
  verses in a document.
  
- `:versewidth' which expects a literal string that is the longest verse of the poem,
  required when applying the `:center' attribute.

As I said, these three attributes require the LateX package verse.sty. A fourth `:options'
attribute would be used to add arbitrary code within the verse environment.

Consider this complete example with Shakespeare's first sonnet:

#+begin_src org
  ,#+ATTR_LaTeX: :center t :options \small :lines 5
  ,#+ATTR_LaTeX: :versewidth Feed’st thy light’st flame with self-substantial fuel,
  ,#+begin_verse
  From fairest creatures we desire increase,
  That thereby beauty’s rose might never die,
  But as the riper should by time decrease,
  His tender heir mught bear his memeory:
  But thou, contracted to thine own bright eyes,
  Feed’st thy light’st flame with self-substantial fuel,
  Making a famine where abundance lies,
  Thyself thy foe, to thy sweet self too cruel.
  Thou that art now the world’s fresh ornament
  And only herald to the gaudy spring,
  Within thine own bud buriest thy content
  And, tender churl, makest waste in niggarding.
  Pity the world, or else this glutton be,
  To eat the world’s due, by the grave and thee.
  ,#+end_verse
#+end_src

when exporting to LaTeX we get:

#+begin_src latex
\settowidth{\versewidth}{Feed’st thy light’st flame with self-substantial fuel,}
\begin{verse}[\versewidth]
\poemlines{5}
\small
From fairest creatures we desire increase,\\
That thereby beauty’s rose might never die,\\
But as the riper should by time decrease,\\
His tender heir mught bear his memeory:\\
But thou, contracted to thine own bright eyes,\\
Feed’st thy light’st flame with self-substantial fuel,\\
Making a famine where abundance lies,\\
Thyself thy foe, to thy sweet self too cruel.\\
Thou that art now the world’s fresh ornament\\
And only herald to the gaudy spring,\\
Within thine own bud buriest thy content\\
And, tender churl, makest waste in niggarding.\\
Pity the world, or else this glutton be,\\
To eat the world’s due, by the grave and thee.\\
\end{verse}
#+end_src

In an attached image I send a screenshot with the typographic result

And finally, this is the patch I would propose

#+begin_src diff
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2a14b25d5..bc6b64e78 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3506,6 +3506,16 @@ channel."
   "Transcode a VERSE-BLOCK element from Org to LaTeX.
 CONTENTS is verse block contents.  INFO is a plist holding
 contextual information."
+(let*
+      ((lin (org-export-read-attribute :attr_latex verse-block :lines))
+       (opt (org-export-read-attribute :attr_latex verse-block :options))
+       (cent (org-export-read-attribute :attr_latex verse-block :center))
+       (attr (concat
+	      (if cent "[\\versewidth]" "")
+	      (if lin (format "\n\\poemlines{%s}" lin) "")
+	      (if opt (format "\n%s" opt) "")))
+       (versewidth (org-export-read-attribute :attr_latex verse-block :versewidth))
+       (vwidth-attr (if versewidth (format "\\settowidth{\\versewidth}{%s}\n" versewidth) "")))
   (concat
    (org-latex--wrap-label
     verse-block
@@ -3513,7 +3523,9 @@ contextual information."
     ;; 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.
-    (format "\\begin{verse}\n%s\\end{verse}"
+    (format "%s\\begin{verse}%s\n%s\\end{verse}"
+	      vwidth-attr
+	      attr
            (replace-regexp-in-string
             "^[ \t]+" (lambda (m) (format "\\hspace*{%dem}" (length m)))
             (replace-regexp-in-string
@@ -3524,7 +3536,7 @@ contextual information."
     info)
    ;; Insert footnote definitions, if any, after the environment, so
    ;; the special formatting above is not applied to them.
-   (org-latex--delayed-footnotes-definitions verse-block info)))
+   (org-latex--delayed-footnotes-definitions verse-block info))))
#+end_src

Regards,

Juan Manuel

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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [patch] A proposal to add LaTeX attributes to verse blocks
  2020-12-17 17:11 [patch] A proposal to add LaTeX attributes to verse blocks Juan Manuel Macías
@ 2021-01-03 10:22 ` TEC
  0 siblings, 0 replies; 7+ messages in thread
From: TEC @ 2021-01-03 10:22 UTC (permalink / raw)
  To: Juan Manuel Macías; +Cc: emacs-orgmode


Hi Juan,

Since you've resent this in a second email, let's discuss this patch
there.

As such, I'm marking this patch as closed.

--
Timothy.


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH] A proposal to add LaTeX attributes to verse blocks
  2021-01-03 13:08     ` TEC
@ 2021-01-07 18:52       ` Juan Manuel Macías
  0 siblings, 0 replies; 7+ messages in thread
From: Juan Manuel Macías @ 2021-01-07 18:52 UTC (permalink / raw)
  To: orgmode; +Cc: TEC

[-- Attachment #1: Type: text/plain, Size: 824 bytes --]

Hi,

I am attaching a new version of my patch for adding LaTeX attributes to
verse blocks. Following the kind suggestions from Timothy, I have also
documented this new features that I propose. I don't know if I have done
it correctly and in the right place...

A short reminder: `lines', `versewidth', and `center' require loading
the LaTeX package verse.sty (https://www.ctan.org/pkg/verse), which is
an extension of the standard LaTeX `verse' environment, and that adds
many features for typesetting poetry. `lines' deals with the marginal
verse numbering; `versewidth' and `center' are related to the optical
centering of the poem. The fourth attribute is to include arbitrary
LaTeX code within the verse environment, so I have provisionally named
it `latexcode'.

Of course, Feedback is welcome.

Regards,

Juan Manuel


[-- Attachment #2: verse-block-patch.diff --]
[-- Type: text/x-patch, Size: 5182 bytes --]

diff --git a/doc/org-manual.org b/doc/org-manual.org
index b015b502c..fe21b5aca 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -13870,6 +13870,54 @@ The LaTeX export back-end converts horizontal rules by the specified
 -----
 #+end_example
 
+*** Verse blocks in LaTeX export
+:PROPERTIES:
+:DESCRIPTION: Attributes specific to special blocks.
+:END:
+
+#+cindex: verse blocks, in @LaTeX{} export
+#+cindex: @samp{ATTR_LATEX}, keyword
+
+The LaTeX export back-end accepts four attributes for verse blocks:
+=:lines=, =:center=, =:versewidth= and =:latexcode=. The three first
+require the external LaTeX package =verse.sty=, wich is an extension
+of the standard LaTeX environment. The purpose of these attributes is
+explained below.
+
+- =:lines= :: To add marginal verse numbering. Its value is an
+  integer, the sequence in which the verses should be numbered.
+- =:center= :: With value =t= all the verses on the page are optically
+  centered (a typographic convention for poetry), taking as a
+  reference the longest verse, which must be indicated by the
+  attribute =:versewidth=.
+- =:versewidth= :: Its value is a literal text string with the longest
+  verse.
+- =:latexcode= :: It accepts any arbitrary LaTeX code that can be
+  included within a LaTeX =verse= environment.
+
+A complete example with Shakespeare's first sonnet:
+
+#+begin_src org
+,#+ATTR_LaTeX: :center t :latexcode \color{red} :lines 5
+,#+ATTR_LaTeX: :versewidth Feed’st thy light’st flame with self-substantial fuel,
+,#+begin_verse
+From fairest creatures we desire increase,
+That thereby beauty’s rose might never die,
+But as the riper should by time decrease,
+His tender heir mught bear his memeory:
+But thou, contracted to thine own bright eyes,
+Feed’st thy light’st flame with self-substantial fuel,
+Making a famine where abundance lies,
+Thyself thy foe, to thy sweet self too cruel.
+Thou that art now the world’s fresh ornament
+And only herald to the gaudy spring,
+Within thine own bud buriest thy content
+And, tender churl, makest waste in niggarding.
+Pity the world, or else this glutton be,
+To eat the world’s due, by the grave and thee.
+,#+end_verse
+#+end_src
+
 ** Markdown Export
 :PROPERTIES:
 :DESCRIPTION: Exporting to Markdown.
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 5e5f1954d..47e0ec40e 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -149,6 +149,19 @@ Example:
 A new =u= mode flag for Calc formulas in Org tables has been added to
 enable Calc units simplification mode.
 
+*** LaTeX attributes for verse blocks
+
+The LaTeX export back-end now accepts four attributes for verse
+blocks:
+
+- =:lines=, for marginal verse numbering;
+- =:center= and =:versewidth=, for optical centering of the verses;
+- =:latexcode=, for any arbitrary LaTeX code that can be included
+  within a LaTeX =verse= environment.
+
+The three first require the external LaTeX package =verse.sty=, wich
+is an extension of the standard LaTeX environment.
+
 ** Miscellaneous
 *** =org-goto-first-child= now works before first heading
 
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index fb9fc3cd6..0931b7e9c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3506,6 +3506,17 @@ channel."
   "Transcode a VERSE-BLOCK element from Org to LaTeX.
 CONTENTS is verse block contents.  INFO is a plist holding
 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))
+       (attr (concat
+	      (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}" "")))
   (concat
    (org-latex--wrap-label
     verse-block
@@ -3513,19 +3524,20 @@ contextual information."
     ;; 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.
-    (format "\\begin{verse}\n%s\\end{verse}"
+    (format "%s\\begin{verse}%s\n%s\\end{verse}%s"
+	      vwidth
+	      attr
 	    (replace-regexp-in-string
 	     "^[ \t]+" (lambda (m) (format "\\hspace*{%dem}" (length m)))
 	     (replace-regexp-in-string
 	      "^[ \t]*\\\\\\\\$" "\\vspace*{1em}"
 	      (replace-regexp-in-string
 	       "\\([ \t]*\\\\\\\\\\)?[ \t]*\n" "\\\\\n"
-	       contents nil t) nil t) nil t))
+	       contents nil t) nil t) nil t) linreset)
     info)
    ;; Insert footnote definitions, if any, after the environment, so
    ;; the special formatting above is not applied to them.
-   (org-latex--delayed-footnotes-definitions verse-block info)))
-
+   (org-latex--delayed-footnotes-definitions verse-block info))))
 
 \f
 ;;; End-user functions

[-- Attachment #3: Type: text/plain, Size: 1827 bytes --]


TEC <tecosaur@gmail.com> writes:

> Juan Manuel Macías <maciaschain@posteo.net> writes:
>
>> Thank you very much for your response and your comments.
>
> Seriously, thanks for the patch. I think the ML is usually a bit more
> responsive, but it seems to be a bit quiet at the moment.
>
>> I agree to name "Insert, include, etc." the attribute to include
>> arbitrary LaTeX code, better than "options".
>
> Glad my feedback seems to have gone down well :). If the only likely use
> of this is adjusting the font, perhaps for the sake of consistency we
> can match the behaviour of tables, which take a :font LaTeX attribute?
>
>> Of course, I can add the necessary documentation to the files you tell
>> me. As I am new to submitting patches, I don't really know how to
>> proceed: do I have to send you the new version of the patch, with the
>> documentation? Should I send a new email with all of it to this list?
>
> Thanks for asking. Sometimes it seems the maintainers take the trouble of
> adding an ORG-NEWS entry or minor touching ups to the patch, but I think
> it's nice to leave as little for them to do as possible :)
>
> Announce changes in: etc/ORG-NEWS
> Document new/different behaviour in: doc/org-manual.org
>
> I think Markup for /Rich Contents > Paragraphs/ may be the right place
> to add a description of this functionality --- verse blocks are
> discussed around line 10750.
>
> Regarding how patches on this ML work, this is what I've observed:
> - Initial version of patch submitted, with justification/explanation
> - Feedback may be given
> - Revisions of the patch are attached in replies to feedback
> - Process repeats until everyone's happy
> - Patch is merged
>
> i.e. it all tends to happen in the same thread.
>
> Hope this helps,
>
> Timothy.
>

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH] A proposal to add LaTeX attributes to verse blocks
  2021-01-03 13:07   ` Juan Manuel Macías
@ 2021-01-03 13:08     ` TEC
  2021-01-07 18:52       ` Juan Manuel Macías
  0 siblings, 1 reply; 7+ messages in thread
From: TEC @ 2021-01-03 13:08 UTC (permalink / raw)
  To: Juan Manuel Macías; +Cc: orgmode


Juan Manuel Macías <maciaschain@posteo.net> writes:

> Thank you very much for your response and your comments.

Seriously, thanks for the patch. I think the ML is usually a bit more
responsive, but it seems to be a bit quiet at the moment.

> I agree to name "Insert, include, etc." the attribute to include
> arbitrary LaTeX code, better than "options".

Glad my feedback seems to have gone down well :). If the only likely use
of this is adjusting the font, perhaps for the sake of consistency we
can match the behaviour of tables, which take a :font LaTeX attribute?

> Of course, I can add the necessary documentation to the files you tell
> me. As I am new to submitting patches, I don't really know how to
> proceed: do I have to send you the new version of the patch, with the
> documentation? Should I send a new email with all of it to this list?

Thanks for asking. Sometimes it seems the maintainers take the trouble of
adding an ORG-NEWS entry or minor touching ups to the patch, but I think
it's nice to leave as little for them to do as possible :)

Announce changes in: etc/ORG-NEWS
Document new/different behaviour in: doc/org-manual.org

I think Markup for /Rich Contents > Paragraphs/ may be the right place
to add a description of this functionality --- verse blocks are
discussed around line 10750.

Regarding how patches on this ML work, this is what I've observed:
- Initial version of patch submitted, with justification/explanation
- Feedback may be given
- Revisions of the patch are attached in replies to feedback
- Process repeats until everyone's happy
- Patch is merged

i.e. it all tends to happen in the same thread.

Hope this helps,

Timothy.


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH] A proposal to add LaTeX attributes to verse blocks
  2021-01-03 10:25 ` TEC
@ 2021-01-03 13:07   ` Juan Manuel Macías
  2021-01-03 13:08     ` TEC
  0 siblings, 1 reply; 7+ messages in thread
From: Juan Manuel Macías @ 2021-01-03 13:07 UTC (permalink / raw)
  To: TEC; +Cc: orgmode

Hi Timothy,

TEC <tecosaur@gmail.com> writes:

> Hi Juan,
>
> Thanks for your patch. 
>
> This looks like a fairly sensible addition. Two comments from me:
>
> 1. I'm not sure that "options" is a good name for arbitrary LaTeX which
>    is included inside the verse block. Perhaps something like "insert"
>    or "include", etc. may be a better fit.
> 2. It's considered generally nice to document features like this :) The
>    two documents which I'd think to note this in are ORG-NEWS and the
>    manual (docs/manual.org).


Thank you very much for your response and your comments.

I agree to name "Insert, include, etc." the attribute to include
arbitrary LaTeX code, better than "options".

Of course, I can add the necessary documentation to the files you tell
me. As I am new to submitting patches, I don't really know how to
proceed: do I have to send you the new version of the patch, with the
documentation? Should I send a new email with all of it to this list?

Best regards,

Juan Manuel 

> All the best,
>
> Timothy.
>


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH] A proposal to add LaTeX attributes to verse blocks
  2020-12-17 17:23 [PATCH] " Juan Manuel Macías
@ 2021-01-03 10:25 ` TEC
  2021-01-03 13:07   ` Juan Manuel Macías
  0 siblings, 1 reply; 7+ messages in thread
From: TEC @ 2021-01-03 10:25 UTC (permalink / raw)
  To: Juan Manuel Macías; +Cc: emacs-orgmode


Hi Juan,

Thanks for your patch. 

This looks like a fairly sensible addition. Two comments from me:

1. I'm not sure that "options" is a good name for arbitrary LaTeX which
   is included inside the verse block. Perhaps something like "insert"
   or "include", etc. may be a better fit.
2. It's considered generally nice to document features like this :) The
   two documents which I'd think to note this in are ORG-NEWS and the
   manual (docs/manual.org).

All the best,

Timothy.

Juan Manuel Macías <maciaschain@posteo.net> writes:

> (Sorry, due to a mistake, the text of my message did not appear in my previous email)
>
> Hi,
>
> I would like to propose this patch to add some LaTeX attributes to the verse block,
> especially to be able to apply certain features from the verse.sty package, which is an
> extension (widely used in Humanities) of the standard LaTeX 'verse' environment.
>
> These attributes would be:
>
> - `:lines' to add verse numbers, according to any numbering sequence
> - `:center' to apply the optical centering of the poem, which is a typographic convention
>   whereby a poem or a group of verses is centered on the page, taking the width of the
>   longest verse as a reference. In fact, optical centering is the correct arrangement of
>   verses in a document.
> - `:versewidth' which expects a text string that is the longest verse of the poem,
>   required when applying the `:center' attribute.
>
> As I said, these three attributes require the LateX package verse.sty. A fourth `:options'
> attribute would be used to add arbitrary code within the verse environment.
>
> Consider this complete example with Shakespeare's first sonnet:
>
> #+begin_src org
>   ,#+ATTR_LaTeX: :center t :options \small :lines 5
>   ,#+ATTR_LaTeX: :versewidth Feed’st thy light’st flame with self-substantial fuel,
>   ,#+begin_verse
>   From fairest creatures we desire increase,
>   That thereby beauty’s rose might never die,
>   But as the riper should by time decrease,
>   His tender heir mught bear his memeory:
>   But thou, contracted to thine own bright eyes,
>   Feed’st thy light’st flame with self-substantial fuel,
>   Making a famine where abundance lies,
>   Thyself thy foe, to thy sweet self too cruel.
>   Thou that art now the world’s fresh ornament
>   And only herald to the gaudy spring,
>   Within thine own bud buriest thy content
>   And, tender churl, makest waste in niggarding.
>   Pity the world, or else this glutton be,
>   To eat the world’s due, by the grave and thee.
>   ,#+end_verse
> #+end_src
>
> when exporting to LaTeX we get:
>
> #+begin_src latex
> \settowidth{\versewidth}{Feed’st thy light’st flame with self-substantial fuel,}
> \begin{verse}[\versewidth]
> \poemlines{5}
> \small
> From fairest creatures we desire increase,\\
> That thereby beauty’s rose might never die,\\
> But as the riper should by time decrease,\\
> His tender heir mught bear his memeory:\\
> But thou, contracted to thine own bright eyes,\\
> Feed’st thy light’st flame with self-substantial fuel,\\
> Making a famine where abundance lies,\\
> Thyself thy foe, to thy sweet self too cruel.\\
> Thou that art now the world’s fresh ornament\\
> And only herald to the gaudy spring,\\
> Within thine own bud buriest thy content\\
> And, tender churl, makest waste in niggarding.\\
> Pity the world, or else this glutton be,\\
> To eat the world’s due, by the grave and thee.\\
> \end{verse}
> #+end_src
>
> In an attached image I send a screenshot with the typographic result
>
> And finally, this is the patch I would propose
>
> #+begin_src diff
> diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
> index 2a14b25d5..bc6b64e78 100644
> --- a/lisp/ox-latex.el
> +++ b/lisp/ox-latex.el
> @@ -3506,6 +3506,16 @@ channel."
>    "Transcode a VERSE-BLOCK element from Org to LaTeX.
>  CONTENTS is verse block contents.  INFO is a plist holding
>  contextual information."
> +(let*
> +      ((lin (org-export-read-attribute :attr_latex verse-block :lines))
> +       (opt (org-export-read-attribute :attr_latex verse-block :options))
> +       (cent (org-export-read-attribute :attr_latex verse-block :center))
> +       (attr (concat
> +	      (if cent "[\\versewidth]" "")
> +	      (if lin (format "\n\\poemlines{%s}" lin) "")
> +	      (if opt (format "\n%s" opt) "")))
> +       (versewidth (org-export-read-attribute :attr_latex verse-block :versewidth))
> +       (vwidth-attr (if versewidth (format "\\settowidth{\\versewidth}{%s}\n" versewidth) "")))
>    (concat
>     (org-latex--wrap-label
>      verse-block
> @@ -3513,7 +3523,9 @@ contextual information."
>      ;; 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.
> -    (format "\\begin{verse}\n%s\\end{verse}"
> +    (format "%s\\begin{verse}%s\n%s\\end{verse}"
> +	      vwidth-attr
> +	      attr
> 	    (replace-regexp-in-string
> 	     "^[ \t]+" (lambda (m) (format "\\hspace*{%dem}" (length m)))
> 	     (replace-regexp-in-string
> @@ -3524,7 +3536,7 @@ contextual information."
>      info)
>     ;; Insert footnote definitions, if any, after the environment, so
>     ;; the special formatting above is not applied to them.
> -   (org-latex--delayed-footnotes-definitions verse-block info)))
> +   (org-latex--delayed-footnotes-definitions verse-block info))))
> #+end_src
>
> Regards,
>
> Juan Manuel



^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH] A proposal to add LaTeX attributes to verse blocks
@ 2020-12-17 17:23 Juan Manuel Macías
  2021-01-03 10:25 ` TEC
  0 siblings, 1 reply; 7+ messages in thread
From: Juan Manuel Macías @ 2020-12-17 17:23 UTC (permalink / raw)
  To: orgmode

[-- Attachment #1: Type: text/plain, Size: 4811 bytes --]

(Sorry, due to a mistake, the text of my message did not appear in my previous email)

Hi,

I would like to propose this patch to add some LaTeX attributes to the verse block,
especially to be able to apply certain features from the verse.sty package, which is an
extension (widely used in Humanities) of the standard LaTeX 'verse' environment.

These attributes would be:

- `:lines' to add verse numbers, according to any numbering sequence
- `:center' to apply the optical centering of the poem, which is a typographic convention
  whereby a poem or a group of verses is centered on the page, taking the width of the
  longest verse as a reference. In fact, optical centering is the correct arrangement of
  verses in a document.
- `:versewidth' which expects a text string that is the longest verse of the poem,
  required when applying the `:center' attribute.

As I said, these three attributes require the LateX package verse.sty. A fourth `:options'
attribute would be used to add arbitrary code within the verse environment.

Consider this complete example with Shakespeare's first sonnet:

#+begin_src org
  ,#+ATTR_LaTeX: :center t :options \small :lines 5
  ,#+ATTR_LaTeX: :versewidth Feed’st thy light’st flame with self-substantial fuel,
  ,#+begin_verse
  From fairest creatures we desire increase,
  That thereby beauty’s rose might never die,
  But as the riper should by time decrease,
  His tender heir mught bear his memeory:
  But thou, contracted to thine own bright eyes,
  Feed’st thy light’st flame with self-substantial fuel,
  Making a famine where abundance lies,
  Thyself thy foe, to thy sweet self too cruel.
  Thou that art now the world’s fresh ornament
  And only herald to the gaudy spring,
  Within thine own bud buriest thy content
  And, tender churl, makest waste in niggarding.
  Pity the world, or else this glutton be,
  To eat the world’s due, by the grave and thee.
  ,#+end_verse
#+end_src

when exporting to LaTeX we get:

#+begin_src latex
\settowidth{\versewidth}{Feed’st thy light’st flame with self-substantial fuel,}
\begin{verse}[\versewidth]
\poemlines{5}
\small
From fairest creatures we desire increase,\\
That thereby beauty’s rose might never die,\\
But as the riper should by time decrease,\\
His tender heir mught bear his memeory:\\
But thou, contracted to thine own bright eyes,\\
Feed’st thy light’st flame with self-substantial fuel,\\
Making a famine where abundance lies,\\
Thyself thy foe, to thy sweet self too cruel.\\
Thou that art now the world’s fresh ornament\\
And only herald to the gaudy spring,\\
Within thine own bud buriest thy content\\
And, tender churl, makest waste in niggarding.\\
Pity the world, or else this glutton be,\\
To eat the world’s due, by the grave and thee.\\
\end{verse}
#+end_src

In an attached image I send a screenshot with the typographic result

And finally, this is the patch I would propose

#+begin_src diff
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2a14b25d5..bc6b64e78 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3506,6 +3506,16 @@ channel."
   "Transcode a VERSE-BLOCK element from Org to LaTeX.
 CONTENTS is verse block contents.  INFO is a plist holding
 contextual information."
+(let*
+      ((lin (org-export-read-attribute :attr_latex verse-block :lines))
+       (opt (org-export-read-attribute :attr_latex verse-block :options))
+       (cent (org-export-read-attribute :attr_latex verse-block :center))
+       (attr (concat
+	      (if cent "[\\versewidth]" "")
+	      (if lin (format "\n\\poemlines{%s}" lin) "")
+	      (if opt (format "\n%s" opt) "")))
+       (versewidth (org-export-read-attribute :attr_latex verse-block :versewidth))
+       (vwidth-attr (if versewidth (format "\\settowidth{\\versewidth}{%s}\n" versewidth) "")))
   (concat
    (org-latex--wrap-label
     verse-block
@@ -3513,7 +3523,9 @@ contextual information."
     ;; 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.
-    (format "\\begin{verse}\n%s\\end{verse}"
+    (format "%s\\begin{verse}%s\n%s\\end{verse}"
+	      vwidth-attr
+	      attr
	    (replace-regexp-in-string
	     "^[ \t]+" (lambda (m) (format "\\hspace*{%dem}" (length m)))
	     (replace-regexp-in-string
@@ -3524,7 +3536,7 @@ contextual information."
     info)
    ;; Insert footnote definitions, if any, after the environment, so
    ;; the special formatting above is not applied to them.
-   (org-latex--delayed-footnotes-definitions verse-block info)))
+   (org-latex--delayed-footnotes-definitions verse-block info))))
#+end_src

Regards,

Juan Manuel

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^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2021-01-07 18:53 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-17 17:11 [patch] A proposal to add LaTeX attributes to verse blocks Juan Manuel Macías
2021-01-03 10:22 ` TEC
2020-12-17 17:23 [PATCH] " Juan Manuel Macías
2021-01-03 10:25 ` TEC
2021-01-03 13:07   ` Juan Manuel Macías
2021-01-03 13:08     ` TEC
2021-01-07 18:52       ` Juan Manuel Macías

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