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qmc-lttc/docs/config.el
2021-01-13 17:59:48 +01:00

72 lines
2.8 KiB
EmacsLisp
Executable File

;; Thanks to Tobias's answer on Emacs Stack Exchange:
;; https://emacs.stackexchange.com/questions/38437/org-mode-batch-export-missing-syntax-highlighting
(package-initialize)
(require 'htmlize)
(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)