sql: change blacklist to only accept list

layers/+lang/sql/README.org

@@ -45,10 +45,16 @@ you can set the variable =sql-capitalize-keywords-disable-interactive= to =t=.
 [[https://github.com/Trevoke/sqlup-mode.el][sqlup-mode]] can be configured to ignore certain keywords. For example if you use
 =name= as column name it would be annoying to have it upcased. You can prevent
 this behaviour by setting the variable =sql-capitalize-keywords-blacklist= to
-string with one keyword (like ="name"=) or to list with multiple keywords (like
-='("name" "varchar")=) to ignore.
+a list with keywords to ignore, e.g.
 
-This layer is blacklisting =name= by default as it is very common name for
+#+BEGIN_SRC emacs-lisp
+  (setq-default dotspacemacs-configuration-layers '(
+    (sql :variables
+         sql-capitalize-keywords t
+         sql-capitalize-keywords-blacklist '("name" "varchar"))))
+#+END_SRC
+
+This layer is blacklisting =name= by default as it is a very common name for
 column and NAME is non-reserved SQL keyword.
 
 * Key bindings

layers/+lang/sql/config.el

@@ -15,5 +15,5 @@
 (defvar sql-capitalize-keywords-disable-interactive nil
   "Do not capitalize keywords in interactive session (e.g. psql).")
 
-(defvar sql-capitalize-keywords-blacklist "name"
-  "Keyword or list of keywords to ignore during capitalization.")
+(defvar sql-capitalize-keywords-blacklist '("name")
+  "List of keywords to ignore during capitalization.")

layers/+lang/sql/packages.el

@@ -136,7 +136,5 @@
     :config
     (progn
       (spacemacs|diminish sqlup-mode)
-      (when sql-capitalize-keywords-blacklist
-        (if (listp sql-capitalize-keywords-blacklist)
-            (setq sqlup-blacklist (append sqlup-blacklist sql-capitalize-keywords-blacklist))
-          (add-to-list 'sqlup-blacklist sql-capitalize-keywords-blacklist))))))
+      (setq sqlup-blacklist (append sqlup-blacklist
+                                    sql-capitalize-keywords-blacklist)))))