ox-latex: support :float nil with caption for minted listings

* lisp/ox-latex.el (org-latex-src-block): Support :float nil with
caption for minted.
(org-latex-listings): Edit docstring to describe this usecase.
* lisp/org.el (org-latex-default-packages-alist): Add “capt-of”
package.

This takes advantage of the capt-of package’s \captionof command,
which allows to insert a caption (with autogenerated number and
\ref-able label) without creating a floating environment.  One example
of where this is useful is in the case of a minted source code listing
that spans more than one page.  (Latex floats can’t be larger than a
page, generally speaking.)

The listings package already handles this case using its own mechanism.

etc/ORG-NEWS

@@ -87,6 +87,9 @@ parameters are now supported: ~:raw~, ~:backend~.  Moreover, there are
 new parameters specific to some pre-defined translators, e.g.,
 ~:environment~ and ~:booktabs~ for ~orgtbl-to-latex~.  See translators
 docstrings (including ~orgtbl-to-generic~) for details.
+*** Non-floating minted listings in Latex export
+It is not possible to specify =#+attr_latex: :float nil= in conjunction with
+source blocks exported by the minted package.
 ** Miscellaneous
 *** File names in links accept are now compatible with URI syntax
 Absolute file names can now start with =///= in addition to =/=. E.g.,
@@ -140,7 +143,7 @@ So you need to replace
 
 : #+HTML_INCLUDE_STYLE: t
 
-by 
+by
 
 : #+OPTIONS: :html-include-style t
 
@@ -194,13 +197,13 @@ of the list.
   now use =amssymb= symbols by default instead.
 
 *** New functions for paragraph motion
-    
+
     The commands =C-down= and =C-up= now invoke special commands
     that use knowledge from the org-elements parser to move the cursor
     in a paragraph-like way.
 
 *** New entities in =org-entities.el=
-    
+
 Add support for ell, imath, jmath, varphi, varpi, aleph, gimel, beth,
 dalet, cdots, S (§), dag, ddag, colon, therefore, because, triangleq,
 leq, geq, lessgtr, lesseqgtr, ll, lll, gg, ggg, prec, preceq,
@@ -308,7 +311,7 @@ instructions:
 - when updating through ELPA (either from GNU ELPA or from Org ELPA),
   you have to install Org's ELPA package in a session where no Org
   function has been called already.
-  
+
 When in doubt, run =M-x org-version RET= and see if you have a mixed-up
 installation.
 

lisp/org.el

@@ -4000,6 +4000,7 @@ header, or they will be appended."
     (""     "marvosym"  t)
     (""     "wasysym"   t)
     (""     "amssymb"   t)
+    (""     "capt-of"   nil)
     (""     "hyperref"  nil)
     "\\tolerance=1000")
   "Alist of default packages to be inserted in the header.
@@ -4021,6 +4022,7 @@ Org mode to function properly:
 - textcomp, marvosymb, wasysym, amssymb: for various symbols used
   for interpreting the entities in `org-entities'.  You can skip
   some of these packages if you don't use any of their symbols.
+- capt-of: for captions outside of floats
 - hyperref: for cross references
 
 Therefore you should not modify this variable unless you know

lisp/ox-latex.el

@@ -2301,7 +2301,11 @@ contextual information."
        ((eq listings 'minted)
 	(let* ((caption-str (org-latex--caption/label-string src-block info))
 	       (float-env
-		(cond ((and (not float) (plist-member attributes :float)) "%s")
+		(cond ((and (not float) (plist-member attributes :float) caption)
+		       (format "%%s\n%s" (replace-regexp-in-string
+					  "\\\\caption" "\\captionof{listing}"
+					  caption-str t t)))
+		      ((and (not float) (plist-member attributes :float)) "%s")
 		      ((string= "multicolumn" float)
 		       (format "\\begin{listing*}\n%%s\n%s\\end{listing*}"
 			       caption-str))