When passing a remote file like "/ssh:myserver:/myfile.txt" to a gnuplot block
as variable the gnuplot process can not access the remote data.
An example:
--8<---------------cut here---------------start------------->8---
#+begin_src gnuplot :var data="/ssh:myserver:/myfile.txt"
plot data u 1:2
#+end_src
--8<---------------cut here---------------end--------------->8---
Attached is a patch, which instead downloads remote files to a unique path and
passes this new path to gnuplot.
Please let me know if there's something to improve regarding the commit message
or patch formatting.
Best,
>From 4f9f98ed8f48754eeff09b8de51734bc8521bb6a Mon Sep 17 00:00:00 2001
From: fpi <g...@pie.tf>
Date: Tue, 29 Sep 2020 18:43:07 +0200
Subject: [PATCH] ob-gnuplot: Download remote input files
* lisp/ob-gnuplot.el (org-babel-gnuplot-process-vars): When variables
point to remote files download them and use a local copy instead.
---
lisp/ob-gnuplot.el | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/lisp/ob-gnuplot.el b/lisp/ob-gnuplot.el
index 62ab04d94..820929c84 100644
--- a/lisp/ob-gnuplot.el
+++ b/lisp/ob-gnuplot.el
@@ -92,7 +92,21 @@ code."
(tablep (or (listp first) (symbolp first))))
(if tablep val (mapcar 'list val)))
(org-babel-temp-file "gnuplot-") params)
- val))))
+ (if (and (file-remote-p val) ;; check if val is a remote file
+ (file-exists-p val)) ;; call to file-exists-p is slow, maybe remove it
+ (let* ((local-name (concat ;; create a unique filename to avoid multiple downloads
+ org-babel-temporary-directory
+ "/gnuplot/"
+ (file-remote-p val 'host)
+ (file-local-name val))))
+ (if (and (file-exists-p local-name) ;; only download file if remote is newer
+ (file-newer-than-file-p local-name val))
+ local-name
+ (make-directory (file-name-directory local-name) t)
+ (copy-file val local-name t)
+ ))
+ val
+ )))))
(org-babel--get-vars params))))
(defun org-babel-expand-body:gnuplot (body params)
--
2.20.1
