add white space highlighting and toggle at C-c w (similar to truncate lines

common/_global.el

@@ -153,6 +153,13 @@
 (global-set-key (kbd "C-c u") 'toggle-truncate-lines)
 (global-set-key (kbd "<M-f4>") 'delete-frame)
 (global-set-key (kbd "C-x C-z") nil)
+(global-set-key (kbd "C-c w")
+                (lambda () 
+				  (interactive)
+				  (whitespace-mode)
+				  (whitespace-newline-mode)
+				)
+)
 
 ;; Lookup the current symbol at point. C-c C-d is a common keybinding
 ;; for this in lisp modes.
@@ -220,6 +227,22 @@
       (display-line-numbers-mode)))
 (global-display-line-numbers-mode)
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; whitespace
+(progn
+  ;; Make whitespace-mode with very basic background coloring for whitespaces.
+  ;; http://xahlee.info/emacs/emacs/whitespace-mode.html
+  (setq whitespace-style (quote (face spaces tabs newline space-mark tab-mark newline-mark )))
+
+  ;; Make whitespace-mode and whitespace-newline-mode use “¶” for end of line char and “▷” for tab.
+  (setq whitespace-display-mappings
+        ;; all numbers are unicode codepoint in decimal. e.g. (insert-char 182 1)
+        '(
+          (space-mark 32 [183] [46]) ; SPACE 32 「 」, 183 MIDDLE DOT 「·」, 46 FULL STOP 「.」
+          (newline-mark 10 [8629 10]) ; LINE FEED,
+          (tab-mark 9 [8594 9] [92 9]) ; tab
+          )))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; modus-themes setup and enable
 (use-package modus-themes