[PATCH] LaTeX export: arbitrary float environments

["Thomas S. Dye" <tsd@tsdye.online>]

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Aloha all,

LaTeX users are able to define arbitrary float types, e.g. with 
the float package.  The attached patch makes them accessible from 
Org mode.

This is a follow on to my efforts several years ago to support the 
Tufte-LaTeX package in Org mode, and a suggestion at the time (by 
Rasmus iirc) to implement an :environment attribute for LaTeX 
export.  This patch achieves a similar goal, but is a bit lighter 
imo.

Let me know if you have questions.

All the best,
Tom

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From 5154901b781f93d08851f96431c976f010fc420c Mon Sep 17 00:00:00 2001
From: "Thomas S. Dye" <tsd@tsdye.online>
Date: Sun, 4 Apr 2021 08:11:40 -1000
Subject: [PATCH] LaTeX export: arbitrary float environments

* lisp/ox-latex.el (`org-latex--inline-image', `org-latex--decorate
table'): recognize arbitrary :float value.

LaTeX users are able to define arbitrary float types.  This patch
makes them accessible from Org mode.

* etc/ORG-NEWS: Announce new :float capability.
---
 etc/ORG-NEWS     |  6 +++++-
 lisp/ox-latex.el | 16 +++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 9fc126b2f..cdfb1c727 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -12,6 +12,10 @@ Please send Org bug reports to mailto:emacs-orgmode@gnu.org.
 
 * Version 9.5 (not yet released)
 ** New options and settings
+*** LaTeX attribute ~:float~ now passes through arbitrary values
+
+LaTeX users are able to define arbitrary float types, e.g. with the float package.  The Org mode LaTeX exporter is now able to process and export arbitrary float types.  The user is responsible for ensuring that Org mode configures LaTeX to process any new float type.
+
 *** Option ~org-hidden-keywords~ now also applies to #+SUBTITLE:
 
 The option ~org-hidden-keywords~ previously applied
@@ -106,7 +110,7 @@ behavior.
 By default ox-html now inlines webp images.
 
 ** New features
-*** =ob-python= improvements to =:return= header argument 
+*** =ob-python= improvements to =:return= header argument
 
 The =:return= header argument in =ob-python= now works for session
 blocks as well as non-session blocks.  Also, it now works with the
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 376d27a07..514801d7c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2377,6 +2377,7 @@ used as a communication channel."
 			((string= float "sideways") 'sideways)
 			((string= float "multicolumn") 'multicolumn)
 			((and (plist-member attr :float) (not float)) 'nonfloat)
+                        (float float)
 			((or float
 			     (org-element-property :caption parent)
 			     (org-string-nw-p (plist-get attr :caption)))
@@ -2470,6 +2471,18 @@ used as a communication channel."
 						   nil t))))
     ;; Return proper string, depending on FLOAT.
     (pcase float
+      ((and (pred stringp) env-string)
+       (format "\\begin{%s}%s
+%s%s
+%s%s
+%s\\end{%s}"
+               env-string
+               placement
+               (if caption-above-p caption "")
+               (if center "\\centering" "")
+               comment-include image-code
+               (if caption-above-p "" caption)
+               env-string))
       (`wrap (format "\\begin{wrapfigure}%s
 %s%s
 %s%s
@@ -3200,7 +3213,7 @@ centered."
 (defun org-latex--decorate-table (table attributes caption above? info)
   "Decorate TABLE string with caption and float environment.
 
-ATTRIBUTES is the plist containing is LaTeX attributes.  CAPTION
+ATTRIBUTES is the plist containing LaTeX attributes.  CAPTION
 is its caption, as a string or nil.  It is located above the
 table if ABOVE? is non-nil.  INFO is the plist containing current
 export parameters.
@@ -3211,6 +3224,7 @@ Return new environment, as a string."
 	    (cond ((and (not float) (plist-member attributes :float)) nil)
 		  ((member float '("sidewaystable" "sideways")) "sidewaystable")
 		  ((equal float "multicolumn") "table*")
+                  (float float)
 		  ((or float (org-string-nw-p caption)) "table")
 		  (t nil))))
 	 (placement
-- 
2.25.1


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--
Thomas S. Dye
https://tsdye.online/tsdye