Stub out +link-hint-define-keyword

I think this is still not quite right

lisp/+link-hint.el

@@ -2,6 +2,7 @@
 
 ;;; Code:
 
+(require 'cl-lib)
 (require 'link-hint)
 
 (defgroup +link-hint nil
@@ -25,6 +26,67 @@
 (defvar +link-hint-map (make-sparse-keymap)
   "Keymap for `link-hint' functionality.")
 
+(cl-defmacro +link-hint-define-keyword (keyword handler docstring
+                                                &optional (types 'link-hint-types)
+                                                &rest rest
+                                                &key multiple &allow-other-keys)
+  "Set up a `link-hint' KEYWORD, with optional TYPES.
+If TYPES is not present, use `link-hint-types'.
+
+KEYWORD defines the link-hint type.  It will be used to create a
+function for opening links of the form \"link-hint-openKEYWORD\".
+
+HANDLER is the function to open a link with.
+
+DOCSTRING is the macro's documentation.
+
+Keyword arguments are passed to `link-hint-define-type' prefixed
+with the KEYWORD."
+  (declare (indent 2)
+           (doc-string 3))
+  (let ((types (symbol-value types))
+        (func-sym (intern (format "+link-hint-open%s" keyword)))
+        (mult-sym (intern (format "%s-multiple" keyword)))
+        (expr))
+    ;; Define the type
+    (push `(dolist (type ',types)
+             (link-hint-define-type type
+               ,keyword ,handler
+               ,@(mapcar (lambda (el)
+                           (if (eq el :multiple)
+                               mult-sym
+                             el))
+                         rest)))
+          expr)
+    ;; Define an opener
+    (push `(defun ,func-sym ()
+             ,(format "%s\n\nDefined by `+link-hint-define'." docstring)
+             (interactive)
+             (avy-with link-hint-open-link
+               (link-hint--one ,keyword)))
+          expr)
+    ;; Handle `:multiple'
+    (when multiple
+      (push `(defun ,(intern (format "+link-hint-open-multiple%s" keyword)) ()
+               ,(format "Open multiple links with `%s'.\n\nDefined by `+link-hint-define'."
+                        func-sym)
+               (avy-with link-hint-open-multiple-links
+                 (link-hint--multiple ,keyword)))
+            expr)
+      (push `(defun ,(intern (format "+link-hint-open-all%s" keyword)) ()
+                 ,(format "Open all visible links with `%s'.\n\nDefined by `+link-hint-define'."
+                          func-sym)
+               (avy-with link-hint-open-all-links
+                 (link-hint--all ,keyword)))
+            expr))
+    ;; Return the built expression
+    `(progn ,@(nreverse expr))))
+
+(+link-hint-define-keyword :secondary browse-url-secondary-browser-function
+  "Open a link in the secondary browser."
+  +link-hint-open-secondary-types
+  :multiple t)
+
 (defun +link-hint-open-secondary-setup (&optional types)
   "Define the `:open-secondary' link-hint type for TYPES.
 If TYPES is nil, define it for `+link-hint-open-secondary-types'."