From c4db3450a91a138ac48526dfce1b97b6431553ea Mon Sep 17 00:00:00 2001
From: Daniel Weschke <daniel.weschke@directbox.de>
Date: Mon, 29 Dec 2025 23:29:22 +0100
Subject: [PATCH] add gpl-prologue

---
 settings/org-settings.el | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/settings/org-settings.el b/settings/org-settings.el
index 4489d6db..7653b7d7 100644
--- a/settings/org-settings.el
+++ b/settings/org-settings.el
@@ -794,7 +794,7 @@ nil the return value is nil"
     (add-to-list 'org-babel-load-languages '(ditaa . t))))
 
 (use-package ob-gnuplot
-  :commands (gpl-file gpl-term)
+  :commands (gpl-file gpl-term gpl-prologue)
   :init
   (with-eval-after-load 'org
     (add-to-list 'org-babel-load-languages '(gnuplot . t)))
@@ -819,8 +819,8 @@ set linetype 6 lc rgb '#4cbded' lw 2 pt 5 ; \
 set linetype 7 lc rgb '#a1132e' lw 2 pt 5 ; \
 filter(x,min,max) = (x >= min && x <= max) ? x : 1/0 ; \
 set datafile separator '\\t'  # treat empty fields in a org-table as 'missing' rather than 'bad' (ignoring, shifting column) "
-    "usage e.g. to prepend style for all gnuplot src blocks by-backend:
-#+property: header-args:gnuplot :prologue (by-backend (latex gnuplot-init-light) (t gnuplot-init-dark))
+    "usage e.g. to prepend style for all gnuplot src blocks by-backend, see
+`gpl-prologue'.
 ")
   (defvar gnuplot-init-dark "reset ; \
 theme_type = 'dark' ; \
@@ -841,10 +841,22 @@ set linetype 6 lc rgb '#76ab2f' lw 2 pt 5 ; \
 set linetype 7 lc rgb '#ecb01f' lw 2 pt 5 ; \
 filter(x,min,max) = (x >= min && x <= max) ? x : 1/0 ; \
 set datafile separator '\\t'  # treat empty fields in a org-table as 'missing' rather than 'bad' (ignoring, shifting column) "
-    "usage e.g. to prepend style for all gnuplot src blocks by-backend:
-#+property: header-args:gnuplot :prologue (by-backend (latex gnuplot-init-light) (t gnuplot-init-dark))
+    "usage e.g. to prepend style for all gnuplot src blocks by-backend, see
+`gpl-prologue'.
 ")
   
+  (defun gpl-prologue ()
+    "\
+returns: file name with extension for the org src header :file
+- for LaTeX export it is set to: FILENAME.tikz
+- for other export it is set to: FILENAME.svg
+
+usage:
+#+HEADER: :prologue (gpl-prologue)
+#+property: header-args:gnuplot :prologue (gpl-prologue)
+"
+    (by-backend (latex gnuplot-init-light) (t gnuplot-init-dark)))
+
   (defun gpl-file (filename)
     "\
 FILENAME: the file name
@@ -861,7 +873,7 @@ See also: http://www.gnuplot.info/docs_5.2/Gnuplot_5.2.pdf#section*.519
     (concat filename (by-backend (latex ".tikz") (article-latex ".tikz") (t ".svg")) )
     ;;(by-backend (latex "") (t (concat filename ".svg")))
     )
-  (defun gpl-term (lsize osize &optional bg)
+  (defun gpl-term (lsize osize &optional bg interactive)
     "\
 LSIZE: latex export size
 OSIZE: other export size
@@ -879,7 +891,7 @@ usage: #+HEADER: :term (gpl-term \"15cm,12cm\" \"380,300\")
      (by-backend
       (latex " color")
       (article-latex " color")
-      (t (concat " mouse standalone background '" (or bg "#11000000") "'")))))
+      (t (concat (when interactive " mouse standalone") " background '" (or bg "#11000000") "'")))))
   )
 
 (use-package ob-latex