From d709583dd11da8583240f33625819bf00b3c1812 Mon Sep 17 00:00:00 2001
From: Andrew Radev <andrey.radev@gmail.com>
Date: Sat, 30 Apr 2016 11:34:23 +0300
Subject: [PATCH 1/3] Fix :AckHelp command bug with missing *.txt files

If there are no *.txt files in the doc directory, the ack command errors
out. Globbing for those files while generating the file list fixes the
issue.
---
 autoload/ack.vim | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/autoload/ack.vim b/autoload/ack.vim
index 82d3de65..4e8cda61 100644
--- a/autoload/ack.vim
+++ b/autoload/ack.vim
@@ -134,15 +134,15 @@ function! s:ApplyMappings() "{{{
 endfunction "}}}
 
 function! s:GetDocLocations() "{{{
-  let dp = ''
+  let dp = []
   for p in split(&rtp, ',')
     let p = p . '/doc/'
     if isdirectory(p)
-      let dp = p . '*.txt ' . dp
+      call extend(dp, glob(p . '*.txt', 0, 1))
     endif
   endfor
 
-  return dp
+  return join(dp, ' ')
 endfunction "}}}
 
 function! s:Highlight(args) "{{{

From d936f7ac99ecdd97ca747d507ba34650cb58fc08 Mon Sep 17 00:00:00 2001
From: Andrew Radev <andrey.radev@gmail.com>
Date: Sat, 30 Apr 2016 11:34:39 +0300
Subject: [PATCH 2/3] Shorten file path as much as possible

This improves the quickfix list filenames in the case when the found
files are under the current directory.
---
 autoload/ack.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/ack.vim b/autoload/ack.vim
index 4e8cda61..8f833b4d 100644
--- a/autoload/ack.vim
+++ b/autoload/ack.vim
@@ -136,7 +136,7 @@ endfunction "}}}
 function! s:GetDocLocations() "{{{
   let dp = []
   for p in split(&rtp, ',')
-    let p = p . '/doc/'
+    let p = fnamemodify(p . '/doc/', ':~:.')
     if isdirectory(p)
       call extend(dp, glob(p . '*.txt', 0, 1))
     endif

From fd0f1c3660cd8d351b68388715daedfd32b0cf28 Mon Sep 17 00:00:00 2001
From: Andrew Radev <andrey.radev@gmail.com>
Date: Tue, 3 May 2016 21:33:10 +0300
Subject: [PATCH 3/3] Fix issue with `isdirectory` and home-relative paths

---
 autoload/ack.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/ack.vim b/autoload/ack.vim
index 8f833b4d..5d4ae123 100644
--- a/autoload/ack.vim
+++ b/autoload/ack.vim
@@ -137,7 +137,7 @@ function! s:GetDocLocations() "{{{
   let dp = []
   for p in split(&rtp, ',')
     let p = fnamemodify(p . '/doc/', ':~:.')
-    if isdirectory(p)
+    if isdirectory(expand(p))
       call extend(dp, glob(p . '*.txt', 0, 1))
     endif
   endfor