Multiple bibliography files with ox-bibtex and html export

[Thibault Marin <thibault.marin@gmx.com>]

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Hi list,

I would like to use ox-bibtex to export a bibliography to html with
multiple bibliography files, as follows:

#+BIBLIOGRAPHY: bibtex_1.bib,bibtex_2.bib plain option:-d option:-noabstract limit:t

This works with latex export but not with html (I get a "Executing
bibtex2html failed").  It appears that bibtex2html can only process a
single file.

I am attaching a patch which allows me to use multiple files with html
export.  It creates a combined bibliography file and call bibtex2html on
it.  I am not sure this is the best way to address this, so any
suggestion would be welcome.

Does this look like something that could be merged?

Thanks,
thibault




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From c8a97a2d79d349a5d7c55ce052daa0794bde49ad Mon Sep 17 00:00:00 2001
From: thibault <thibault.marin@gmx.com>
Date: Tue, 23 Aug 2016 22:57:19 -0500
Subject: [PATCH] * contrib/lisp/ox-bibtex.el (org-bibtex-process-bib-files):
 Add support for multiple bibliography files with html export.

Combine comma-separated bibliography files into a single one and process it
using bibtex2html.  This matches the behavior already present for latex export.
---
 contrib/lisp/ox-bibtex.el | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/contrib/lisp/ox-bibtex.el b/contrib/lisp/ox-bibtex.el
index 56dec38..7e266ab 100644
--- a/contrib/lisp/ox-bibtex.el
+++ b/contrib/lisp/ox-bibtex.el
@@ -191,13 +191,34 @@ Return new parse tree."
 		(file (org-bibtex-get-file keyword))
 		temp-file
 		out-file)
+	    (let ((files (org-split-string file ",")))
+	      (when (< 1 (length files))
+		(let ((combined-bib-file
+		       (concat
+			(file-name-sans-extension
+			 (file-name-nondirectory
+			  (buffer-file-name))) "-combined.bib")))
+		  (with-temp-file combined-bib-file
+		    (dolist (bib files)
+		      (insert-file-contents
+		       (if (equal (file-name-extension bib) "bib")
+			   bib
+			 (concat bib ".bib")
+			 )
+		       )
+		      )
+		    )
+		  (setq file combined-bib-file)
+		  )
+		)
+	      )
 	    ;; Test if filename is given with .bib-extension and strip
     	    ;; it off. Filenames with another extensions will be
 	    ;; untouched and will finally rise an error in bibtex2html.
 	    (setq file (if (equal (file-name-extension file) "bib")
 			   (file-name-sans-extension file) file))
-	    ;; Outpufiles of bibtex2html will be put into current working directory
-	    ;; so define a variable for this.
+	    ;; Output files of bibtex2html will be put into current
+	    ;; working directory so define a variable for this.
 	    (setq out-file (file-name-sans-extension
 			    (file-name-nondirectory file)))
 	    ;; limit is set: collect citations throughout the document
-- 
2.8.1