[PATCH] c-csl : accept relative CSL filenames

[Emmanuel Charpentier <emm.charpentier@free.fr>]

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This (minuscule) patch allows to pass a relative (to the buffer's
default directory) file name to denote the CSL style file.

Rationale : this allows the use of "one-of" styles for "one-of"
projects without overloading a defailt CSL style directory (which may
or may not exist on a given system : think JabRef users...). Also
useful for hacked CSL files specific to a given project.

For the same reasons, when the named filename exists both in the
central CSL file and the buffer's default directory, the latter is
retained.

HTH,

PS : Note that I have already transferred my rights to GNU for emacs-
related works.

--
Emmanuel Charpentier


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From 80e4121f8a74aec1e5638713ce7af8e041404e44 Mon Sep 17 00:00:00 2001
From: Emmanuel Charpentier <emm.charpentier@free.fr>
Date: Tue, 19 Oct 2021 19:57:17 +0200
Subject: [PATCH] oc-csl : accept relative CSL filenames

---
 lisp/oc-csl.el | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lisp/oc-csl.el b/lisp/oc-csl.el
index 94de97e33..ab75db85b 100644
--- a/lisp/oc-csl.el
+++ b/lisp/oc-csl.el
@@ -364,15 +364,19 @@ corresponding to one of the output formats supported by Citeproc: `html',
 
 INFO is the export state, as a property list.
 
-When file name is relative, expand it according to `org-cite-csl-styles-dir',
+When file name is relative, expand it according to the buffer's default
+directory, failing that according to `org-cite-csl-styles-dir',
 or raise an error if the variable is unset."
   (pcase (org-cite-bibliography-style info)
     ('nil org-cite-csl--fallback-style-file)
     ((and (pred file-name-absolute-p) file) file)
+    ((and (pred (lambda (x)
+		  (let ((fn (expand-file-name x default-directory)))
+		    (if (file-exists-p fn) fn nil)))) file) file)
     ((and (guard org-cite-csl-styles-dir) file)
      (expand-file-name file org-cite-csl-styles-dir))
     (other
-     (user-error "Cannot handle relative style file name: %S" other))))
+     (user-error "CSL style file not found: %S" other))))
 
 (defun org-cite-csl--locale-getter ()
   "Return a locale getter.
-- 
2.33.0