Added the org-fragtog package to do inline latex edit/preview

.emacs.d/init.el

@@ -87,8 +87,13 @@
     (dired-directory dired-directory "%b"))))
 
   (global-font-lock-mode t)
-  (custom-set-faces
+  
-    '(flyspell-incorrect ((t (:inverse-video t)))))
+(custom-set-faces
+ ;; custom-set-faces was added by Custom.
+ ;; If you edit it by hand, you could mess it up, so be careful.
+ ;; Your init file should contain only one such instance.
+ ;; If there is more than one, they won't work right.
+ '(flyspell-incorrect ((t (:inverse-video t)))))
 
 (line-number-mode 1)
 (column-number-mode 1)
@@ -321,7 +326,8 @@ A->B
 (let* ((wanted-packages
         '(flycheck
           company
-	   org-appear))
+	   org-appear
+	   org-fragtog))
        (missing-wanted-packages (remove-if #'package-installed-p wanted-packages)))
   (when missing-wanted-packages
     (message "Missing wanted packages: %s" missing-wanted-packages)
@@ -339,4 +345,16 @@ A->B
 
 (global-visual-line-mode 1) ; 1 for on & 0 for off
 
+(add-hook 'org-mode-hook 'org-fragtog-mode)
+
 (load-theme 'leuven t)
+(custom-set-variables
+ ;; custom-set-variables was added by Custom.
+ ;; If you edit it by hand, you could mess it up, so be careful.
+ ;; Your init file should contain only one such instance.
+ ;; If there is more than one, they won't work right.
+ '(org-format-latex-options
+   '(:foreground default :background default :scale 1.5 :html-foreground "Black" :html-background "Transparent" :html-scale 1.0 :matchers
+		 ("begin" "$1" "$" "$$" "\\(" "\\[")))
+ '(package-selected-packages
+   '(org-fragtog org-appear magit htmlize flycheck ess company auctex)))

.emacs.d/init.org

@@ -513,7 +513,8 @@ This often fails, yielding an ugly warning, and isn't of any use in Org-mode any
 (let* ((wanted-packages
         '(flycheck
           company
-	   org-appear))
+	   org-appear
+	   org-fragtog))
        (missing-wanted-packages (remove-if #'package-installed-p wanted-packages)))
   (when missing-wanted-packages
     (message "Missing wanted packages: %s" missing-wanted-packages)
@@ -541,6 +542,36 @@ This mode makes the emphasis markers appear when the cursor is on it
 #+begin_src emacs-lisp :tangle init.el
 (global-visual-line-mode 1) ; 1 for on & 0 for off
 #+end_src
+** Auto toggle the preview of LaTeX fragments
+#+begin_src emacs-lisp :tangle init.el
+(add-hook 'org-mode-hook 'org-fragtog-mode)
+#+end_src
+** Remote image display
+This code was taken from https://emacs.stackexchange.com/questions/42281/org-mode-is-it-possible-to-display-online-images and makes use of the =org-yt= package.
+
+#+begin_src emacs-lisp 
+(require 'org-yt)
+
+(defun org-image-link (protocol link _description)
+  "Interpret LINK as base64-encoded image data."
+  (cl-assert (string-match "\\`img" protocol) nil
+             "Expected protocol type starting with img")
+  (let ((buf (url-retrieve-synchronously (concat (substring protocol 3) ":" link))))
+    (cl-assert buf nil
+               "Download of image \"%s\" failed." link)
+    (with-current-buffer buf
+      (goto-char (point-min))
+      (re-search-forward "\r?\n\r?\n")
+      (buffer-substring-no-properties (point) (point-max)))))
+
+(org-link-set-parameters
+ "imghttp"
+ :image-data-fun #'org-image-link)
+
+(org-link-set-parameters
+ "imghttps"
+ :image-data-fun #'org-image-link)
+#+end_src
 * Theme
 ** Activation du thème
 #+begin_src emacs-lisp :tangle init.el