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doc/ack.txt

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+*ack.txt* Plugin that integrates ack with Vim
+
+Author:  Antoine Imbert <antoine.imbert+ackvim@gmail.com>        *ack-author*
+License: Same terms as Vim itself (see |license|)
+
+INTRODUCTION                                                            *ack*
+
+This plugin is a front for the Perl module App::Ack.  Ack can be used as a
+replacement for grep.  This plugin will allow you to run ack from vim, and
+shows the results in a split window.
+
+Ack {pattern} [{directory}]   Search recursively in {directory} (which defaults to
+                              the current directory) for the {pattern}.
+
+Files containing the search term will be listed in the split window, along with
+the line number of the occurrence, once for each occurrence.  <Enter> on a line
+in this window will open the fail, and place the cursor on the matching line.

plugin/ack.vim

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+" NOTE: You must, of course, install the ack script
+"       in your path.
+" On Ubuntu:
+"   sudo apt-get install ack-grep
+"   ln -s /usr/bin/ack-grep /usr/bin/ack
+"
+function! Ack(args)
+    let grepprg_bak=&grepprg
+    set grepprg=ack\ -H\ --nocolor\ --nogroup
+    execute "silent! grep " . a:args
+    botright copen
+    let &grepprg=grepprg_bak
+endfunction
+
+command! -nargs=* -complete=file Ack call Ack(<q-args>)