Search for files (ack -g).

doc/ack.txt

@@ -34,6 +34,12 @@ shows the results in a split window.
     Just like |:Ack| + |:lgrepadd|.  Searches, but appends results to
     |location-list|
 
+:AckFile [options] {pattern} [{directory}]                          *:AckFile*
+
+    Search recursively in {directory} (which defaults to the current
+    directory) for filenames matching the {pattern}.  Behaves just like the
+    |:grep| command, but will open the |Quickfix| window for you.
+
 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 file, and place the cursor on the matching

plugin/ack.vim

@@ -13,13 +13,17 @@ if !exists("g:ackprg")
 	let g:ackprg="ack -H --nocolor --nogroup --column"
 endif
 
-" Format, used to manage column jump
-let g:ackformat="%f:%l:%c:%m"
-
 function! s:Ack(cmd, args)
     redraw
     echo "Searching ..."
 
+    " Format, used to manage column jump
+    if a:cmd =~# '-g$'
+        let g:ackformat="%f"
+    else
+        let g:ackformat="%f:%l:%c:%m"
+    end
+
     let grepprg_bak=&grepprg
     let grepformat_bak=&grepformat
     try
@@ -51,3 +55,4 @@ command! -bang -nargs=* -complete=file AckAdd call s:Ack('grepadd<bang>', <q-arg
 command! -bang -nargs=* -complete=file AckFromSearch call s:AckFromSearch('grep<bang>', <q-args>)
 command! -bang -nargs=* -complete=file LAck call s:Ack('lgrep<bang>', <q-args>)
 command! -bang -nargs=* -complete=file LAckAdd call s:Ack('lgrepadd<bang>', <q-args>)
+command! -bang -nargs=* -complete=file AckFile call s:Ack('grep<bang> -g', <q-args>)