bug#19556: eww: make URI rewriting fully customizable

[Ivan Shmakov]

>>>>> Lars Magne Ingebrigtsen <larsi@gnus.org> writes:
>>>>> Ivan Shmakov <ivan@siamics.net> writes:

 >> FWIW, removing eww-search-words from the hook allows one to type
 >> something like https://en.wikipedia.org/wiki/Free software RET (note
 >> the blank) at the prompt and be with that.

 > That sounds like a bug that should be fixed.

 > I don't see a use case for letting users customise this stuff,

        How about allowing for out-of-tree packages to define !whatever
        keywords as shortcuts for whatever search engines and what not?

        Think of, say, “!wh Example” being rewritten into
        https://en.wikipedia.org/wiki/Example?action=history.

 > and it sounds like it would be error-prone.

        How so?

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