Deprecate rainbow-delimiters-delimiter-blacklist.

rainbow-delimiters-pick-face-function offers a superset of its
functionality.

rainbow-delimiters-test.el

@@ -188,10 +188,6 @@
                  0 1 (face (rainbow-delimiters-depth-1-face))
                  1 2 (face (rainbow-delimiters-mismatched-face))))))))
 
-(ert-deftest doesnt-highlighlight-disabled-delimiters ()
-  (let ((rainbow-delimiters-delimiter-blacklist '(?\( ?\))))
-    (should-do-nothing 'text-mode "(((())))")))
-
 (ert-deftest doesnt-highlight-escaped-delimiters ()
   (with-temp-buffer-in-mode 'emacs-lisp-mode
     (with-string (str "(bar ?\\( (foo?))")
@@ -252,19 +248,9 @@
                  7 8 (face (rainbow-delimiters-depth-1-face diff-added))
                  8 9 (face diff-added)))))))
 
-(ert-deftest blacklisted-contribute-to-depth ()
-  (let ((rainbow-delimiters-delimiter-blacklist '(?\( ?\))))
-    (with-temp-buffer-in-mode 'text-mode
-      (with-string (str "([])")
-        (should (ert-equal-including-properties
-                 (buffer-string)
-                 #("([])"
-                   1 2 (face (rainbow-delimiters-depth-2-face))
-                   2 3 (face (rainbow-delimiters-depth-2-face)))))))))
-
 (ert-deftest can-customize-face-picker ()
   (let ((rainbow-delimiters-pick-face-function
-         (lambda (_depth _loc _match)
+         (lambda (_depth _match _loc)
            'font-lock-keyword-face)))
     (with-temp-buffer-in-mode 'emacs-lisp-mode
       (with-string (str "(())")
@@ -276,5 +262,25 @@
                    2 3 (face (font-lock-keyword-face))
                    3 4 (face (font-lock-keyword-face)))))))))
 
+(ert-deftest face-picker-can-disable-highlighting ()
+  (let ((rainbow-delimiters-pick-face-function
+         (lambda (depth match loc)
+           (unless (memq (char-after loc) '(?\( ?\)))
+             (rainbow-delimiters-default-pick-face depth match loc)))))
+    (should-do-nothing 'text-mode "(((())))")))
+
+(ert-deftest delimiters-disabled-by-face-picker-contribute-to-depth ()
+  (let ((rainbow-delimiters-pick-face-function
+         (lambda (depth match loc)
+           (unless (memq (char-after loc) '(?\( ?\)))
+             (rainbow-delimiters-default-pick-face depth match loc)))))
+    (with-temp-buffer-in-mode 'text-mode
+      (with-string (str "([])")
+        (should (ert-equal-including-properties
+                 (buffer-string)
+                 #("([])"
+                   1 2 (face (rainbow-delimiters-depth-2-face))
+                   2 3 (face (rainbow-delimiters-depth-2-face)))))))))
+
 (provide 'rainbow-delimiters-test)
 ;;; rainbow-delimiters-test.el ends here

rainbow-delimiters.el

@@ -90,12 +90,13 @@ When depth exceeds innermost defined face, colors cycle back through."
   :prefix "rainbow-delimiters-")
 
 (defcustom rainbow-delimiters-delimiter-blacklist '()
-  "Disable highlighting of selected delimiters.
-
-Delimiters in this list are not highlighted."
-  :tag "Delimiter Blacklist"
-  :type '(repeat character)
+  "Unused variable pending removal.
+To prevent highlighting of certain delimiters, use
+`rainbow-delimiters-pick-face-function' instead."
   :group 'rainbow-delimiters)
+(make-obsolete-variable 'rainbow-delimiters-delimiter-blacklist
+                        'rainbow-delimiters-pick-face-function
+                        "2.1")
 
 (defcustom rainbow-delimiters-pick-face-function
   #'rainbow-delimiters-default-pick-face
@@ -193,13 +194,10 @@ The returned value is either `rainbow-delimiters-unmatched-face',
 
 LOC is the location of the character to add text properties to.
 DEPTH is the nested depth at LOC, which determines the face to use.
-MATCH is nil iff it's a mismatched closing delimiter.
-
-The delimiter is not highlighted if it's a blacklisted delimiter."
-  (unless (memq (char-after loc) rainbow-delimiters-delimiter-blacklist)
-    (let ((face (funcall rainbow-delimiters-pick-face-function depth match loc)))
-      (when face
-        (font-lock-prepend-text-property loc (1+ loc) 'face face)))))
+MATCH is nil iff it's a mismatched closing delimiter."
+  (let ((face (funcall rainbow-delimiters-pick-face-function depth match loc)))
+    (when face
+      (font-lock-prepend-text-property loc (1+ loc) 'face face))))
 
 (defun rainbow-delimiters--char-ineligible-p (loc ppss delim-syntax-code)
   "Return t if char at LOC should not be highlighted.