Rename files and add init support

vim/.vim/plug.d/core.vim

@@ -1,3 +1,28 @@
-Plug 'SirVer/ultisnips', { 'tag': '3.2' }
 Plug 'editorconfig/editorconfig-vim', { 'tag': 'v1.1.1' }
 Plug 'tpope/vim-surround'
+
+" UltiSnips
+Plug 'SirVer/ultisnips', { 'tag': '3.2' }
+let g:UltiSnipsSnippetDirectories = [ 'UltiSnips', 'snips' ]
+
+" NerdTree
+Plug 'preservim/nerdtree', { 'on':  'NERDTreeToggle', 'tag': '6.9.8' }
+
+" Close all open buffers on entering a window if the only
+" buffer that's left is the NERDTree buffer
+function! s:CloseIfOnlyNerdTreeLeft()
+    if exists("t:NERDTreeBufName")
+        if bufwinnr(t:NERDTreeBufName) != -1
+            if winnr("$") == 1
+                q
+            endif
+        endif
+    endif
+endfunction
+
+let g:NERDTreeDirArrowExpandable = '▸'
+let g:NERDTreeDirArrowCollapsible = '▾'
+let NERDTreeDirArrows = 1
+let NERDTreeIgnore = [ '\.pyc$', '\.swp$' ]
+
+autocmd WinEnter * call s:CloseIfOnlyNerdTreeLeft()

vim/.vim/vimrc

@@ -0,0 +1,15 @@
+" Load from init.d instead of plugin directory. This is done so a leader key
+" can be set before loading plugin settings. This allows the plugin setting
+" files to set mappings with leader keys
+for f in split(glob('~/.vim/init.d/*.vim'), '\n')
+    exe 'source' f
+endfor
+
+" The plugged plugin manager function calls need to be called between the
+" plug#begin and plug#end. Because of that, using the normal plugin directory
+" loading won't work.
+call plug#begin('~/.vim/plugged')
+for f in split(glob('~/.vim/plug.d/*.vim'), '\n')
+    exe 'source' f
+endfor
+call plug#end()

vim/.vimrc

@@ -1,7 +0,0 @@
-call plug#begin('~/.vim/plugged')
-
-for f in split(glob('~/.vim/plug.d/*.vim'), '\n')
-    exe 'source' f
-endfor
-
-call plug#end()