add to org function mpl-prologue an argument to define mplstyle

settings/org-settings.el

@@ -891,15 +891,20 @@ returns: file name varible with extension for the org src header :var
 usage: #+HEADER: :var fname=(mpl-var \"ledger-income\")
 "
     (concat filename (by-backend (latex ".pgf") (article-latex ".pgf") (t ".svg"))))
-  (defun mpl-prologue ()
+  (defun mpl-prologue (&optional mplstyle)
     "\
 Matplotlib
 
 returns: style settings for a org src python matplotlib code block
 - for LaTeX export it is not set.
-- for other export it is set to: import matplotlib.pyplot as plt;plt.style.use('dark_background');
+- for other export it is set to load kpfonts and my.mplstyle.
+  Optional Argument MPLSTYLE:
+  - my (default)
+  - my-tex (uses latex to render fonts)
 
-usage: #+HEADER: :prologue (mpl-prologue)
+usage:
+  #+HEADER: :prologue (mpl-prologue)
+  #+HEADER: :prologue (mpl-prologue \"my-tex\")
 "
     (by-backend (latex "")
                 (article-latex "")
@@ -915,12 +920,13 @@ import matplotlib.pyplot as plt
 styles = plt.style.core.read_style_directory('%s')
 plt.style.core.update_nested_dict(plt.style.library, styles)
 try:
-  plt.style.use('my')
+  plt.style.use('%s')
 except:
   pass
 "
                            (concat config-dir "scripts/fonts")
-                           (concat config-dir "scripts/matplotlib-stylelib")))))
+                           (concat config-dir "scripts/matplotlib-stylelib")
+                           (or mplstyle "my")))))
 
 (use-package ol-notmuch
   :after (org))