Emacs: Add hexrgb and use it to compute 'vhl/default-face.

init.d/basics/buffers.el

@@ -1,6 +1,6 @@
 ;;; buffers.el --- Default settings for buffers. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-05-27T14:02:27+0200>
+;; Time-stamp: <2020-06-02T15:16:39+0200>
 
 ;;; Commentary:
 ;; * Setup scratch buffer.
@@ -106,10 +106,11 @@
 (use-package volatile-highlights
   :demand t
   :diminish volatile-highlights-mode
-  :after (doom-themes display-line-numbers)
+  :after (doom-themes display-line-numbers hexrgb)
   :config (progn
             (set-face-background 'vhl/default-face
-                                 (face-foreground 'line-number))
+                                 (hexrgb-increment-equal-rgb
+                                  (face-background 'default) 2 8))
             (volatile-highlights-mode)))
 
 (provide 'basics/buffers)

init.d/misc/libs.el

@@ -0,0 +1,11 @@
+;;; libs.el --- Libraries                            -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;;; Code:
+
+;; Functions to manipulate colors, including RGB hex strings.
+(use-package hexrgb
+  :commands (hexrgb-increment-equal-rgb))
+
+(provide 'misc/libs)
+;;; libs.el ends here

init.el

@@ -1,6 +1,6 @@
 ;;; init.el --- tastytea's Emacs init file. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-05-29T17:22:23+0200>
+;; Time-stamp: <2020-06-02T15:07:00+0200>
 
 ;;; Commentary:
 ;; Requires at least Emacs 26.
@@ -34,6 +34,7 @@
 (require 'misc/documentation)
 (require 'misc/email)
 (require 'misc/misc)
+(require 'misc/libs)
 
 (require 'programming/common)
 (require 'programming/lsp)