[nongnu] elpa/gnuplot d6f8598 121/184: Cleanup inline-image mode

[ELPA Syncer]

branch: elpa/gnuplot
commit d6f8598a0cf5938780aff68333c6d119e1de8724
Author: joddie <jonxfield@gmail.com>
Commit: joddie <jonxfield@gmail.com>

    Cleanup inline-image mode
    
    - Check for the ability to display images whenever
      `gnuplot-inline-image-mode` is non-nil (not only when `inline`)
    
    - Use `message` rather than `error` when images cannot be displayed;
      should avoid annoying startup errors when the same configuration is
      shared between graphical and TTY emacs
    
    - Check that the Gnuplot process is running before sending commands to
      set up image capturing
---
 gnuplot.el | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/gnuplot.el b/gnuplot.el
index e5b3e99..9f34377 100644
--- a/gnuplot.el
+++ b/gnuplot.el
@@ -704,10 +704,12 @@ symbol `complete' in gnuplot-mode buffers."
 (defun gnuplot-set-display-mode (variable value &rest args)
   "Customize :set function for `gnuplot-inline-image-mode'."
   (if (and (eq variable 'gnuplot-inline-image-mode)
-           (eq value 'inline)
+           value
            (not (gnuplot-display-images-p)))
-      (error "Displaying images is not supported."))
-  (set variable value)
+      (progn
+        (message "Displaying images is not supported.")
+        (set variable nil))
+    (set variable value))
   (gnuplot-setup-comint-for-image-mode))
 
 (defcustom gnuplot-inline-image-mode nil
@@ -2467,7 +2469,8 @@ gnuplot process buffer will be displayed in a window."
     (message "Setting will take effect when plots are displayed in Emacs")))
 
 (defun gnuplot-setup-comint-for-image-mode ()
-  (when (and gnuplot-buffer (buffer-name gnuplot-buffer))
+  (when (and gnuplot-buffer (buffer-live-p gnuplot-buffer)
+             (get-buffer-process gnuplot-buffer))
     (with-current-buffer gnuplot-buffer
       (if gnuplot-inline-image-mode
           (progn