bug#52973: Adding a few context-menu-mode commands

[Philip Kaludercic <philipk@posteo.net>]

I just wanted to apply this patch, then I noticed that this would also
change the default browser for EWW from html.duckduckgo.com to
duckduckgo.com.  The effect is that every search query it redirected to
the JS-free version.  Any ideas how to fix this?  Should I just remove
the EWW integration, or change the DuckDuckGo URL to the HTML-version?

Philip Kaludercic <philipk@posteo.net> writes:

> Juri Linkov <juri@linkov.net> writes:
>
>>>> Maybe then a better place to add new functions would be in
>>>> lisp/net/webjump.el.  webjump is a package created exactly
>>>> for this purpose.  Then new functions could share the same
>>>> prefix webjump-.
>>>
>>> I didn't know about webjump, thank you for the hint.  My only fear is
>>> that the prefix would make the functionality harder to discover.
>>
>> The fact that its name starts with the word "web" improves
>> discoverability.
>
> How is this?
>
> From 2a32d1f7df0b8dfdceb3f63476df150d55215b5d Mon Sep 17 00:00:00 2001
> From: Philip Kaludercic <philipk@posteo.net>
> Date: Tue, 4 Jan 2022 20:36:32 +0100
> Subject: [PATCH] Add search engine functionality
>
> * lisp/net/eww.el (eww-search-prefix): Deprecate user option
> (eww): Use webjump-search-query
> * lisp/net/webjump.el (webjump-default-search-engine): Add user option
> (webjump-choose-search-engine): Add function
> (webjump-search-query): Add function
> (webjump-search): Add autoloaded command
> (webjump-search-at-point): Add autoloaded command
> (webjump-search-at-mouse): Add command
> (webjump-search-context-menu): Add function for context-menu support.
> ---
>  lisp/misc.el        |  1 +
>  lisp/net/eww.el     | 10 +++---
>  lisp/net/webjump.el | 80 ++++++++++++++++++++++++++++++++++++++++++++-
>  3 files changed, 86 insertions(+), 5 deletions(-)
>
> diff --git a/lisp/misc.el b/lisp/misc.el
> index 39ec9497d7..6e5aede789 100644
> --- a/lisp/misc.el
> +++ b/lisp/misc.el
> @@ -27,6 +27,7 @@
>  
>  (eval-when-compile
>    (require 'tabulated-list))
> +(require 'cl-lib)
>  
>  ;;;###autoload
>  (defun copy-from-above-command (&optional arg)
> diff --git a/lisp/net/eww.el b/lisp/net/eww.el
> index 8930eb427d..2ef6b35100 100644
> --- a/lisp/net/eww.el
> +++ b/lisp/net/eww.el
> @@ -33,6 +33,7 @@
>  (require 'url)
>  (require 'url-queue)
>  (require 'xdg)
> +(require 'webjump)
>  (eval-when-compile (require 'subr-x))
>  
>  (defgroup eww nil
> @@ -55,6 +56,9 @@ eww-search-prefix
>    :version "24.4"
>    :group 'eww
>    :type 'string)
> +(make-obsolete-variable 'eww-search-prefix
> +                        "webjump-default-search-engine"
> +                        "29.1")
>  
>  (defcustom eww-use-browse-url "\\`mailto:"
>    "EWW will use `browse-url' when following links that match this regexp.
> @@ -355,7 +359,7 @@ eww-browse
>  (defun eww (url &optional new-buffer buffer)
>    "Fetch URL and render the page.
>  If the input doesn't look like an URL or a domain name, the
> -word(s) will be searched for via `eww-search-prefix'.
> +word(s) will be searched for via `webjump-search'.
>  
>  If NEW-BUFFER is non-nil (interactively, the prefix arg), use a
>  new buffer instead of reusing the default EWW buffer.
> @@ -464,9 +468,7 @@ eww--dwim-expand-url
>                 ;; Some sites do not redirect final /
>                 (when (string= (url-filename (url-generic-parse-url url)) "")
>                   (setq url (concat url "/"))))
> -           (setq url (concat eww-search-prefix
> -                             (mapconcat
> -                              #'url-hexify-string (split-string url) "+"))))))
> +           (setq url (webjump-search-query url)))))
>    url)
>  
>  (defun eww--preprocess-html (start end)
> diff --git a/lisp/net/webjump.el b/lisp/net/webjump.el
> index 7547f92d7d..17c9312c54 100644
> --- a/lisp/net/webjump.el
> +++ b/lisp/net/webjump.el
> @@ -370,7 +370,85 @@ webjump-url-fix-trailing-slash
>        (concat url "/")
>      url))
>  
> -;;-----------------------------------------------------------------------------
> +\f
> +;;; Search engine functionality
> +
> +(defcustom webjump-default-search-engine "DuckDuckGo"
> +  "Search engine to use for `webjump-search' and related commands.
> +The string should denote an entry in `webjump-sites', with a
> +`simple-query' entry."
> +  :type 'string)
> +
> +(defun webjump-choose-search-engine ()
> +  "Choose a search engine to use from `webjump-sites'.
> +If no prefix argument was used, the function will return the
> +entry for `webjump-default-search-engine'."
> +  (assoc-string
> +   (if current-prefix-arg
> +       (completing-read
> +        (format-prompt "Use search engine"
> +                       webjump-default-search-engine)
> +        webjump-sites
> +        (lambda (ent)
> +          (and (vectorp (cdr ent))
> +               (eq (aref (cdr ent) 0) 'simple-query)))
> +        t nil nil webjump-default-search-engine)
> +     webjump-default-search-engine)
> +   webjump-sites t))
> +
> +(defun webjump-search-query (string)
> +  "Generate an URL query to search for STRING."
> +  (let ((engine (cdr (webjump-choose-search-engine))))
> +    (webjump-url-fix
> +     (concat (aref engine 2)
> +             (webjump-url-encode string)
> +             (aref engine 3)))))
> +
> +;;;###autoload
> +(defun webjump-search (string)
> +  "Search for STRING using a search engine.
> +If the optional argument ENGINE may be used to override
> +`webjump-default-search-engine'."
> +  (interactive (list (if (use-region-p)
> +                         (buffer-substring (region-beginning) (region-end))
> +                       (read-string "Search: "))))
> +  (browse-url (webjump-search-query string)))
> +
> +;;;###autoload
> +(defun webjump-search-at-point ()
> +  "Search for symbol at point online.
> +See `webjump-search' for more details."
> +  (interactive)
> +  (let ((query (thing-at-point 'symbol)))
> +    (unless query
> +      (user-error "Nothing to search for"))
> +    (webjump-search query)))
> +
> +;;;###autoload
> +(defun webjump-search-at-mouse (click)
> +  "Query an online search engine at CLICK.
> +If a region is active, the entire region will be sent, otherwise
> +the symbol at point will be used.  See `webjump-search' for more
> +details."
> +  (interactive "e")
> +  (let ((query (if (use-region-p)
> +                   (buffer-substring (region-beginning)
> +                                     (region-end))
> +                 (thing-at-mouse click 'symbol))))
> +    (unless (or query (string-match-p "\\`[[:space:]\n]*\\'" query))
> +      (user-error "Nothing to search for"))
> +    (webjump-search query)))
> +
> +;;;###autoload
> +(defun webjump-search-context-menu (menu click)
> +  "Populate MENU with command to search online at CLICK."
> +  (save-excursion
> +    (mouse-set-point click)
> +    (define-key-after menu [webjump-search-separator] menu-bar-separator)
> +    (define-key-after menu [webjump-search-at-mouse]
> +      '(menu-item "Online search" webjump-search-at-mouse
> +                  :help "Search for region or word online")))
> +  menu)
>  
>  (provide 'webjump)
>  
> -- 
> 2.34.0
>
>
> While I agree that web helps, I think a search-online defalias for
> webjump-search would be appreciated when looking for commands via
> apropos.

-- 
	Philip Kaludercic