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Add a tidbit about useful mapping function to README.md FAQ #254

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Expand Up @@ -140,6 +140,30 @@ the convention of Vim's built-in `:grep` and `:make` commands.
[The Silver Searcher]: https://github.com/ggreer/the_silver_searcher
[sadface]: https://github.com/mileszs/ack.vim/commit/d97090fb502d40229e6976dfec0e06636ba227d5#commitcomment-5771145

#### How do I use this in a mapping? ####

Call one of Ack.vim's defined functions from a map:

```vim
map <D-F> :Ack!
```

Or use

```vim
function! Search ()
if empty(@/)
call feedkeys(':Ack! ')
else
:AckFromSearch!
endif
endfunction

map <silent> <D-F> :call Search()<CR>
```

to automatically search for the highlighted text (the `@/` register contains highlighted text) or start a prompt for the text to search for.

## Changelog

Please see [the GitHub releases page][releases].
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