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+;;; +browse-url.el -*- lexical-binding: t -*-
+
+(require 'browse-url)
+
+(cl-defmacro +browse-url-make-external-viewer-handler
+    (viewer default-args
+            &optional (prompt "URL: ")
+            &key
+            (custom-group 'browse-url)
+            (name (intern (format "+browse-url-with-%s" viewer)))
+            doc vardoc
+            (varname (intern (format "%s-args" name)))
+            (fallback t))
+  "Create a `browse-url' handler function calling VIEWER on the url.
+This macro also creates a `customize' setting in CUSTOM-GROUP for
+VIEWER's command-line arguments.  DEFAULT-ARGS specifies the
+default arguments for that setting.
+
+PROMPT is shown to the user in the function's `interactive' spec,
+as an argument to `browse-url-interactive-arg'.
+
+The resulting function is named NAME, which defaults to
+`+browse-url-wth-VIEWER'.  The custom variable is named VARNAME,
+which defaults to `NAME-args'.  If DOC or VARDOC are provided,
+they'll be the documentation of the function and variable
+respectively; otherwise, basic docstrings are used.
+
+Finally, if FALLBACK is non-nil (by default, it's
+`browse-url-generic'), the function will call that if unable to
+start VIEWER."
+  (declare (indent 1))
+  `(progn
+     (defcustom ,varname ,default-args
+       ,(or doc (format "Arguments to pass to %s in `%s'." viewer name))
+       :type '(repeat :tag "Command-line argument" string)
+       :group ',custom-group)
+     (defun ,name (url &optional new-window)
+       ,(or vardoc (format "Open URL in %s." viewer))
+       (interactive (browse-url-interactive-arg ,prompt))
+       (let* ((url (browse-url-encode-url url))
+              (process-environment (browse-url-process-environment)))
+         (message ,(format "Opening %%s in %s..." viewer) url)
+         (unless (ignore-errors (apply #'start-process
+                                       (format "%s %s" ,viewer url) nil
+                                       ,viewer
+                                       (append ,varname (list url))))
+           ,@(cond
+              ((eq fallback t) '((browse-url-generic url new-window)))
+              (fallback `((funcall ,fallback url new-window)))
+              (:else `((message "Can't find viewer: `%s'" ,viewer)
+                       nil))))))))
+
+(defcustom +browse-url-download-open t
+  "Whether to open downloaded files afterward."
+  :group 'browse-url
+  :type 'boolean)
+
+(defun +browse-url-download-callback (status url dir)
+  ;; A slight change to `eww-download-callback' that returns the downloaded
+  ;; filename.
+  (unless (plist-get status :error)
+    (let* ((obj (url-generic-parse-url url))
+           (path (directory-file-name (car (url-path-and-query obj))))
+           (file (eww-make-unique-file-name
+                  (eww-decode-url-file-name (file-name-nondirectory path))
+                  dir)))
+      (goto-char (point-min))
+      (re-search-forward "\r?\n\r?\n")
+      (let ((coding-system-for-write 'no-conversion))
+        (write-region (point) (point-max) file))
+      (message "Saved %s" file)
+      file)))
+
+(defun +browse-url-download (url &rest _)
+  "Download URL to `eww-download-directory'."
+  (interactive "sDownload URL: ")
+  (let ((dir eww-download-directory))
+    (when (functionp dir) (setq dir (funcall dir)))
+    (make-directory dir :parents)
+    (url-retrieve url
+                  (lambda (s u d)
+                    (let ((file (+browse-url-download-callback s u d)))
+                      (when +browse-url-download-open
+                        (browse-url-xdg-open file))))
+                  (list url dir))))
+
+(provide '+browse-url)
+;;; +browse-url.el ends here