Remove support to ack 1.x

README.md

@@ -76,6 +76,7 @@ check out the docs for the Perl script 'ack', for obvious reasons:
 
 ### 1.0
 
+* Remove support to ack 1.x
 * Start to use a Changelog
 * Use `autoload` directory to define functions, instead of `plugin`.
 * Add option to auto fold the results(`g:ack_autofold_results`)

autoload/ack.vim

@@ -13,10 +13,7 @@ function! ack#Ack(cmd, args)
   " Format, used to manage column jump
   if a:cmd =~# '-g$'
     let g:ackformat="%f"
-    if s:ackprg_version > 2
-      " remove arguments that conflict with -g
-      let l:ackprg_run = substitute(l:ackprg_run, '-H\|--column', '', 'g')
-    endif
+    let l:ackprg_run = substitute(l:ackprg_run, '-H\|--column', '', 'g')
   else
     let g:ackformat="%f:%l:%c:%m,%f:%l:%m"
   endif

plugin/ack.vim

@@ -10,8 +10,6 @@ if !exists("g:ackprg")
   let g:ackprg .= " -s -H --nocolor --nogroup --column"
 endif
 
-let s:ackprg_version = eval(matchstr(system(g:ackprg . " --version"), '[0-9.]\+'))
-
 if !exists("g:ack_apply_qmappings")
   let g:ack_apply_qmappings = !exists("g:ack_qhandler")
 endif