Please add support for dlangs packagemanager to ob-C.el

["Christian Köstlin" <christian.koestlin@gmail.com>]

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Please see the patch comment. I reworked my original patch to fit into the
TINYPATCH category.

Kind regards,
Christian

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From 85ee67484d85c42babc4dd616597f554099070b5 Mon Sep 17 00:00:00 2001
From: Christian Koestlin <christian.koestlin@gmail.com>
Date: Tue, 8 Mar 2022 23:12:31 +0100
Subject: [PATCH] lisp/ob-C.el: Support dub dependencies for dlang

Dlangs official package manager dub (https://dub.pm/) supports running
single files that carry dependency information in a /+ dub.sdl comment
block.

This patch switches from rdmd to dub if dependencies are used in the
source block. The dependency format used in the sourceblocks is
`:dependencies '(dep1=v1 ...)`.
The version specifier can be left out or be used with `*` which then
resolves to the latest version of the package.

Example: test.org
#+BEGIN_SRC D :dependencies '(mir-algorithm=3.16.2 dyaml=0.9.2) :results value pp
    import mir.combinatorics : permutations;
    import dyaml;
    foreach (permutation; ['a', 'b', 'c'].permutations) {
        writeln(permutation);
    }
    import std.array : appender;
    auto buffer = appender!string;
    dumper().dump(buffer, Node([1,2,3]));
    writeln(buffer.data);
#+END_SRC
TINYCHANGE
---
 lisp/ob-C.el | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/lisp/ob-C.el b/lisp/ob-C.el
index e9951cb79..ae97b27a1 100644
--- a/lisp/ob-C.el
+++ b/lisp/ob-C.el
@@ -176,7 +176,7 @@ or `org-babel-execute:C++' or `org-babel-execute:D'."
 	       (concat tmp-bin-file cmdline))
 	      (`d
 	       (format "%s %s %s %s"
-		       org-babel-D-compiler
+		       (if (eq 'nil (cdr (assq :dependencies params))) org-babel-D-rdmd "dub")
 		       flags
 		       (org-babel-process-file-name tmp-src-file)
 		       cmdline)))
@@ -268,11 +268,20 @@ or `org-babel-execute:C++' or `org-babel-execute:D'."
 		    (org-babel-C-ensure-main-wrap body)
 		  body) "\n") "\n")))
 
+(defun org-babel-D-dependencies (dependencies)
+  "Convert DEPENDENCIES to dub.sdl code."
+  (mapconcat (lambda (x) (let* ((s (split-string (symbol-name x) "="))
+                                (d (car s))
+                                (v (or (car (cdr s)) "*")))
+                               (format "dependency \"%s\" version=\"%s\"" d v)))
+   dependencies "\n"))
+
 (defun org-babel-C-expand-D (body params)
   "Expand a block of D code with org-babel according to its header arguments."
   (let ((vars (org-babel--get-vars params))
 	(colnames (cdr (assq :colname-names params)))
 	(main-p (not (string= (cdr (assq :main params)) "no")))
+	(dependencies (cdr (assq :dependencies params)))
 	(imports (or (cdr (assq :imports params))
 		     (org-babel-read (org-entry-get nil "imports" t)))))
     (when (stringp imports)
@@ -280,6 +289,9 @@ or `org-babel-execute:C++' or `org-babel-execute:D'."
     (setq imports (append imports '("std.stdio" "std.conv")))
     (mapconcat 'identity
 	       (list
+		"/+ dub.sdl:"
+		(org-babel-D-dependencies dependencies)
+		"+/"
 		"module mmm;"
 		;; imports
 		(mapconcat
-- 
2.37.3