Vim - helptags not working for NERDtree

Question

I downloaded and manually installed NERDTree from http://www.vim.org/scripts/script.php?script_id=1658

@hits ➜  .vim rvm:(-ruby-1.9.2)  ls -laR
.:
total 28
drwxr-xr-x  6 hitsu hitsu 4096 2012-02-16 15:21 .
drwxr-xr-x 49 hitsu hitsu 4096 2012-02-27 17:43 ..
drwxrwxr-x  2 hitsu hitsu 4096 2011-12-28 14:18 doc
drwxrwxr-x  2 hitsu hitsu 4096 2011-12-28 14:17 nerdtree_plugin
-rw-rw-r--  1 hitsu hitsu  283 2012-02-07 11:05 .netrwhist
drwxrwxr-x  2 hitsu hitsu 4096 2011-12-28 14:17 plugin
drwxrwxr-x  2 hitsu hitsu 4096 2011-12-28 14:17 syntax

./doc:
total 60
drwxrwxr-x 2 hitsu hitsu  4096 2011-12-28 14:18 .
drwxr-xr-x 6 hitsu hitsu  4096 2012-02-16 15:21 ..
-rw-rw-r-- 1 hitsu hitsu 52744 2011-12-28 14:17 NERD_tree.txt

./nerdtree_plugin:
total 20
drwxrwxr-x 2 hitsu hitsu 4096 2011-12-28 14:17 .
drwxr-xr-x 6 hitsu hitsu 4096 2012-02-16 15:21 ..
-rw-rw-r-- 1 hitsu hitsu 1614 2011-12-28 14:17 exec_menuitem.vim
-rw-rw-r-- 1 hitsu hitsu 8124 2011-12-28 14:17 fs_menu.vim

./plugin:
total 132
drwxrwxr-x 2 hitsu hitsu   4096 2011-12-28 14:17 .
drwxr-xr-x 6 hitsu hitsu   4096 2012-02-16 15:21 ..
-rw-rw-r-- 1 hitsu hitsu 126233 2011-12-28 14:17 NERD_tree.vim

./syntax:
total 12
drwxrwxr-x 2 hitsu hitsu 4096 2011-12-28 14:17 .
drwxr-xr-x 6 hitsu hitsu 4096 2012-02-16 15:21 ..
-rw-rw-r-- 1 hitsu hitsu 3741 2011-12-28 14:17 nerdtree.vim

I tried to open the help file for NERDtree in vim. However when I typed :helptags I got the error E471: Arugment required

After that I typed :help NERD_tree.txt but I got the error E149: Sorry, can't find help for NERD_tree.txt

Help instructions are taken from: http://www.vim.org/scripts/script.php?script_id=1658

I know that I can just open NERD_tree.txt in any editor manually (for example vim or Emacs), but I'm just asking out of curiosity.

PS I'm a vim noob. :P

Answer 1

You have to give :helptags the directory where the help file (that you want to be parsed) is. For example:

:helptags ~/.vim/doc