Fixes errorformat when using vim-dispatch.

Do not use vim-dispatch by default, with you want to use vim-dispatch
must set the variable `g:ack_use_dispatch`

README.md

@@ -108,3 +108,7 @@ with versions that does not have this variable.
 ### 1.0.4
 
 * Fixes #128. Always apply mappings, even when using vim-dispatch.
+
+### 1.0.5
+
+* Fixes #128. Fixes the `errorformat` for ack when using vim-dispatch.

autoload/ack.vim

@@ -26,8 +26,8 @@ function! ack#Ack(cmd, args)
   try
     " NOTE: we escape special chars, but not everything using shellescape to
     "       allow for passing arguments etc
-    if exists(":Dispatch")
-      setlocal errorformat=%f:%l:%c:%m
+    if g:ack_use_dispatch
+      let &l:errorformat = "%P%f,%l:%c:%m,%-Q"
       let &l:makeprg=g:ackprg." " . escape(l:grepargs, '|#%')
       Make
     else
@@ -49,7 +49,7 @@ function! ack#Ack(cmd, args)
     let s:close_cmd = ':cclose<CR>'
   endif
 
-  if !exists(":Dispatch")
+  if !g:ack_use_dispatch
     call ack#show_results()
   endif
   call <SID>apply_maps()

doc/ack.txt

@@ -203,6 +203,18 @@ Example:
         let g:ackpreview = 1
 <
 
+                                                          *g:ack_use_dispatch*
+
+g:ack_use_dispatch
+Default: 0
+
+Use this option to use vim-dispatch to search the results in background
+
+Example:
+>
+        let g:ack_use_dispatch = 1
+<
+
 ==============================================================================
 MAPPINGS                                                        *ack-mappings*
 

plugin/ack.vim

@@ -22,6 +22,13 @@ if !exists("g:ack_apply_lmappings")
   let g:ack_apply_lmappings = !exists("g:ack_lhandler")
 endif
 
+if !exists("g:ack_use_dispatch")
+  let g:ack_use_dispatch = 0
+elseif g:ack_use_dispatch && !exists(":Dispatch")
+  echoe "Dispatch not available"
+  let g:ack_use_dispatch = 0
+end
+
 let s:ack_mappings = {
       \ "t": "<C-W><CR><C-W>T",
       \ "T": "<C-W><CR><C-W>TgT<C-W>j",