allow gnuplot to generate plot in different directories

[Eric S Fraga <esflists@gmail.com>]

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Nicolas,

attached is a patch (relative to master from a few minutes ago) which
allows gnuplot babel blocks to send the output to the right
directory.  I have tested this with both buffers associated with actual
files and buffers not associated with any file.

Your suggestion for getting the directory name worked just fine.

Thanks,
eric

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From da418f64fd01958c17402e8c5c3556eb82ba127e Mon Sep 17 00:00:00 2001
From: Eric S Fraga <e.fraga@ucl.ac.uk>
Date: Wed, 6 Dec 2017 15:48:12 +0000
Subject: [PATCH] allow gnuplot to generate plots in different directories

* lisp/ob-gnuplot.el (org-babel-expand-body:gnuplot) if the org buffer
  is associated with a file, direct gnuplot to change to the directory
  for that file.
---
 lisp/ob-gnuplot.el | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lisp/ob-gnuplot.el b/lisp/ob-gnuplot.el
index b0743f604..856efe13a 100644
--- a/lisp/ob-gnuplot.el
+++ b/lisp/ob-gnuplot.el
@@ -116,6 +116,8 @@ code."
            (timefmt (cdr (assq :timefmt params)))
            (time-ind (or (cdr (assq :timeind params))
                          (when timefmt 1)))
+	   (directory (and (buffer-file-name)
+			   (file-name-directory (buffer-file-name))))
 	   (add-to-body (lambda (text) (setq body (concat text "\n" body)))))
       ;; append header argument settings to body
       (when title (funcall add-to-body (format "set title '%s'" title)))
@@ -161,7 +163,10 @@ code."
 			  (format "\\$%s" (car pair)) (cdr pair) body)))
 	    vars)
       (when prologue (funcall add-to-body prologue))
-      (when epilogue (setq body (concat body "\n" epilogue))))
+      (when epilogue (setq body (concat body "\n" epilogue)))
+      ;; setting the directory needs to be done first so that
+      ;; subsequent 'output' directive goes to the right place
+      (when directory (funcall add-to-body (format "cd '%s'" directory))))
     body))
 
 (defun org-babel-execute:gnuplot (body params)
-- 
2.15.0


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-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.1.3-170-g51234f

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