Not cleaning the image cache before displaying images

Image cache cleaning was being performed during comint output filtering
and, since that can happen in batches, if the total output had more
images than the maximum cache size, some of them would be gone (in fact
it was even worse: we were cleaning the cache after each image display).

Now we just perform cache maintenance before sending the input, and
avoid paying a price for non-rackets by making the cache dir setting
implementation-specific.

2 files changed, 21 insertions, 20 deletions

diff --git a/elisp/geiser-image.el b/elisp/geiser-image.el
index 1d8a03a..3e2a666 100644
--- a/elisp/geiser-image.el
+++ b/elisp/geiser-image.el
@@ -1,6 +1,6 @@
 ;; geiser-image.el -- support for image display
 
-;; Copyright (c) 2012 Jose Antonio Ortega Ruiz
+;; Copyright (c) 2012, 2015 Jose Antonio Ortega Ruiz
 
 ;; This program is free software; you can redistribute it and/or
 ;; modify it under the terms of the Modified BSD License. You should
@@ -14,6 +14,7 @@
 
 (require 'geiser-custom)
 (require 'geiser-base)
+(require 'geiser-impl)
 
 
 ;;; Customization:
@@ -34,34 +35,35 @@
   :group 'geiser-image)
 
 (geiser-custom--defcustom geiser-image-cache-dir nil
-  ;; Currently, this variable is updated, if needed, by racket during
-  ;; initialization.  If/when we add image support for other
-  ;; implementations, we'll have to work with implementation-specific
-  ;; caches.
-  "Directory where generated images are stored.  If nil, the
-system wide tmp dir will be used."
+  "Default directory where generated images are stored.
+
+If nil,the system wide tmp dir will be used."
   :type 'path
   :group 'geiser-image)
 
 (geiser-custom--defface image-button
   'button geiser-image "image buttons in terminal buffers")
 
+(geiser-impl--define-caller geiser-image--cache-dir image-cache-dir ()
+  "Directory where generated images are stored.  If this function
+returns nil, no images are generated.")
+
 
 
 (defun geiser-image--list-cache ()
   "List all the images in the image cache."
-  (and geiser-image-cache-dir
-       (file-directory-p geiser-image-cache-dir)
-       (let ((files (directory-files-and-attributes
-                     geiser-image-cache-dir t "geiser-img-[0-9]*.png")))
-         (mapcar 'car
-                 (sort files (lambda (a b)
-                               (< (float-time (nth 6 a))
-                                  (float-time (nth 6 b)))))))))
+  (let ((cdir (geiser-image--cache-dir nil)))
+    (and cdir
+         (file-directory-p cdir)
+         (let ((files (directory-files-and-attributes cdir t
+                                                      "geiser-img-[0-9]*.png")))
+           (mapcar 'car (sort files (lambda (a b)
+                                      (< (float-time (nth 6 a))
+                                         (float-time (nth 6 b))))))))))
 
 (defun geiser-image--clean-cache ()
   "Clean all except for the last `geiser-image-cache-keep-last'
-images in `geiser-image-cache-dir'."
+images in `geiser-image--cache-dir'."
   (interactive)
   (dolist (f (butlast (geiser-image--list-cache) geiser-image-cache-keep-last))
     (delete-file f)))
@@ -101,9 +103,7 @@ images in `geiser-image-cache-dir'."
             (if (and inline-images-p (display-images-p))
                 (insert-image (create-image file) "[image]")
               (geiser-image--insert-button file)
-              (when auto-p (geiser-image--display file)))
-            (setq geiser-image-cache-dir (file-name-directory file))
-          (geiser-image--clean-cache)))))
+              (when auto-p (geiser-image--display file)))))))
     seen))
 
 (defun geiser-view-last-image (n)
diff --git a/elisp/geiser-repl.el b/elisp/geiser-repl.el
index 9ecbd25..c5c0490 100644
--- a/elisp/geiser-repl.el
+++ b/elisp/geiser-repl.el
@@ -1,6 +1,6 @@
 ;;; geiser-repl.el --- Geiser's REPL
 
-;; Copyright (C) 2009, 2010, 2011, 2012, 2013 Jose Antonio Ortega Ruiz
+;; Copyright (C) 2009, 2010, 2011, 2012, 2013, 2015 Jose Antonio Ortega Ruiz
 
 ;; This program is free software; you can redistribute it and/or
 ;; modify it under the terms of the Modified BSD License. You should
@@ -440,6 +440,7 @@ module command as a string")
 (setq geiser-eval--default-connection-function 'geiser-repl--connection)
 
 (defun geiser-repl--prepare-send ()
+  (geiser-image--clean-cache)
   (geiser-autodoc--inhibit-autodoc)
   (geiser-con--connection-deactivate geiser-repl--connection))