programs.zsh.syntax-highlighting: support custom highlighting patterns

see https://github.com/zsh-users/zsh-syntax-highlighting/blob/master/docs/highlighters/pattern.md
for further reference.

nixos/modules/programs/zsh/zsh-syntax-highlighting.nix

@@ -36,6 +36,24 @@ in
             https://github.com/zsh-users/zsh-syntax-highlighting/blob/master/docs/highlighters.md
           '';
         };
+
+        patterns = mkOption {
+          default = [];
+          type = types.listOf(types.listOf(types.string));
+
+          example = literalExample ''
+            [
+              ["rm -rf *" "fg=white,bold,bg=red"]
+            ]
+          '';
+
+          description = ''
+            Specifies custom patterns to be highlighted by zsh-syntax-highlighting.
+
+            Please refer to the docs for more information about the usage:
+            https://github.com/zsh-users/zsh-syntax-highlighting/blob/master/docs/highlighters/pattern.md
+          '';
+        };
       };
     };
 
@@ -48,6 +66,16 @@ in
         ${optionalString (length(cfg.highlighters) > 0)
           "ZSH_HIGHLIGHT_HIGHLIGHTERS=(${concatStringsSep " " cfg.highlighters})"
         }
+
+        ${optionalString (length(cfg.patterns) > 0)
+          (assert(elem "pattern" cfg.highlighters); (foldl (
+            a: b:
+              assert(length(b) == 2); ''
+                ${a}
+                ZSH_HIGHLIGHT_PATTERNS+=('${elemAt b 0}' '${elemAt b 1}')
+              ''
+          ) "") cfg.patterns)
+        }
       '';
     };
   }