vim: Better tab completion for deoplete

.vimrc.bundles

@@ -26,30 +26,29 @@ Plug 'alvan/vim-closetag' " Auto-close HTML tags
 Plug 'itchyny/lightline.vim'
 
 "" Language support
-if $GOPATH != ""
-    Plug 'fatih/vim-go'
-    Plug 'rhysd/vim-go-impl'
-endif
+Plug 'Shougo/deoplete.nvim' " Replaces neocomplcache
+Plug 'Shougo/neosnippet'
 Plug 'janko-m/vim-test'
 Plug 'leshill/vim-json'
+Plug 'plasticboy/vim-markdown'
 Plug 'hdima/python-syntax'
 Plug 'hynek/vim-python-pep8-indent'
 Plug 'davidhalter/jedi-vim' " Python static analysis engine
 Plug 'jmcantrell/vim-virtualenv'
-Plug 'plasticboy/vim-markdown'
-Plug 'Shougo/deoplete.nvim' " Replaces neocomplcache
-Plug 'Shougo/neopairs.vim' " Close parens
+if $GOPATH != ""
+    Plug 'fatih/vim-go'
+    Plug 'rhysd/vim-go-impl'
+endif
 
 "" Syntax highlighting
 Plug 'hail2u/vim-css3-syntax'
 Plug 'pangloss/vim-javascript'
 Plug 'othree/html5.vim'
 Plug 'ap/vim-css-color'
-Plug 'sophacles/vim-bundle-mako'
-Plug 'groenewege/vim-less'
+Plug 'sophacles/vim-bundle-mako', { 'for': 'mako' }
+Plug 'groenewege/vim-less', { 'for': 'less' }
 Plug 'honza/dockerfile.vim'
-Plug 'Shougo/neosnippet'
-Plug 'tikhomirov/vim-glsl'
+Plug 'tikhomirov/vim-glsl', { 'for': 'glsl' }
 Plug 'vim-scripts/rfc-syntax', { 'for': 'rfc' } " optional syntax highlighting for RFC files
 
 "" Colorschemes
@@ -129,18 +128,29 @@ autocmd FileType mako let b:match_words = '<\(\w\w*\):</\1,{:}'
     autocmd FileType python setlocal omnifunc=jedi#completions
     autocmd FileType xml setlocal omnifunc=xmlcomplete#CompleteTags
     autocmd FileType ruby setlocal omnifunc=rubycomplete#Complete
-    autocmd FileType go setlocal omnifunc=gocomplete#Complete
 " }
 
 " deoplete {
     let g:deoplete#enable_at_startup = 1
 
-    " Tab-complete
-    inoremap <silent><expr> <Tab>
-    \ pumvisible() ? "\<C-n>" : "\<TAB>"
+    " deoplete-go
+    set completeopt+=noinsert
+    set completeopt+=noselect
+
+    " Tab-complete, without completing on an empty line.
+    function! s:check_back_space()
+      let col = col('.') - 1
+      return !col || getline('.')[col - 1] =~ '\s'
+    endfunction
+
+    imap <silent><expr> <TAB>
+          \ pumvisible() ? "\<C-n>" :
+          \ <SID>check_back_space() ? "\<TAB>" :
+          \ deoplete#mappings#manual_complete()
+    "inoremap <expr><TAB>  pumvisible() ? "\<C-n>" : "\<TAB>"
 
     " Use head matcher instead of fuzzy matcher
-    call deoplete#custom#set('_', 'matchers', ['matcher_head'])
+    "call deoplete#custom#set('_', 'matchers', ['matcher_head'])
 
     " doplete + vim-jedi for Python
     "let g:jedi#completions_enabled = 0