Added emacs config file

docs/config.el

@@ -2,4 +2,69 @@
 ;; https://emacs.stackexchange.com/questions/38437/org-mode-batch-export-missing-syntax-highlighting
 
 (package-initialize)
+(require 'font-lock)
+(require 'subr-x) ;; for `when-let'
 
+(unless (boundp 'maximal-integer)
+  (defconst maximal-integer (lsh -1 -1)
+    "Maximal integer value representable natively in emacs lisp."))
+
+(defun face-spec-default (spec)
+  "Get list containing at most the default entry of face SPEC.
+Return nil if SPEC has no default entry."
+  (let* ((first (car-safe spec))
+     (display (car-safe first)))
+    (when (eq display 'default)
+      (list (car-safe spec)))))
+
+(defun face-spec-min-color (display-atts)
+  "Get min-color entry of DISPLAY-ATTS pair from face spec."
+  (let* ((display (car-safe display-atts)))
+    (or (car-safe (cdr (assoc 'min-colors display)))
+    maximal-integer)))
+
+(defun face-spec-highest-color (spec)
+  "Search face SPEC for highest color.
+That means the DISPLAY entry of SPEC
+with class 'color and highest min-color value."
+  (let ((color-list (cl-remove-if-not
+             (lambda (display-atts)
+               (when-let ((display (car-safe display-atts))
+                  (class (and (listp display)
+                          (assoc 'class display)))
+                  (background (assoc 'background display)))
+             (and (member 'light (cdr background))
+                  (member 'color (cdr class)))))
+             spec)))
+    (cl-reduce (lambda (display-atts1 display-atts2)
+         (if (> (face-spec-min-color display-atts1)
+            (face-spec-min-color display-atts2))
+             display-atts1
+           display-atts2))
+           (cdr color-list)
+           :initial-value (car color-list))))
+
+(defun face-spec-t (spec)
+  "Search face SPEC for fall back."
+  (cl-find-if (lambda (display-atts)
+        (eq (car-safe display-atts) t))
+          spec))
+
+(defun my-face-attribute (face attribute &optional frame inherit)
+  "Get FACE ATTRIBUTE from `face-user-default-spec' and not from `face-attribute'."
+  (let* ((face-spec (face-user-default-spec face))
+     (display-attr (or (face-spec-highest-color face-spec)
+               (face-spec-t face-spec)))
+     (attr (cdr display-attr))
+     (val (or (plist-get attr attribute) (car-safe (cdr (assoc attribute attr))))))
+    ;; (message "attribute: %S" attribute) ;; for debugging
+    (when (and (null (eq attribute :inherit))
+           (null val))
+      (let ((inherited-face (my-face-attribute face :inherit)))
+    (when (and inherited-face
+           (null (eq inherited-face 'unspecified)))
+      (setq val (my-face-attribute inherited-face attribute)))))
+    ;; (message "face: %S attribute: %S display-attr: %S, val: %S" face attribute display-attr val) ;; for debugging
+    (or val 'unspecified)))
+
+(advice-add 'face-attribute :override #'my-face-attribute)