Idk try some snippet+ycm via supertab solution or something

.gitmodules

@@ -160,3 +160,9 @@
 [submodule "vim/bundle/vim-colorful-go"]
 	path = vim/bundle/vim-colorful-go
 	url = github:ajswis/vim-colorful-go
+[submodule "vim/bundle/ultisnips"]
+	path = vim/bundle/ultisnips
+	url = github:SirVer/ultisnips
+[submodule "vim/bundle/supertab"]
+	path = vim/bundle/supertab
+	url = github:ervandew/supertab

vim/bundle/supertab

@@ -0,0 +1 @@
+Subproject commit 40fe711e088e2ab346738233dd5adbb1be355172

vim/bundle/ultisnips

@@ -0,0 +1 @@
+Subproject commit 6fdc3647f72e0a1f321ea6bd092ecd01f7c187ba

vimrc

@@ -521,3 +521,12 @@ if has('nvim')
   let g:python_host_prog = "/usr/local/bin/python2"
   let g:python3_host_prog = "/usr/local/bin/python3"
 endif
+
+let g:ycm_key_list_select_completion = ['<C-n>', '<Down>']
+let g:ycm_key_list_previous_completion = ['<C-p>', '<Up>']
+let g:SuperTabDefaultCompletionType = '<C-n>'
+
+let g:UltiSnipsSnippetsDir="~/.vim/snippets"
+let g:UltiSnipsExpandTrigger="<tab>"
+let g:UltiSnipsJumpForwardTrigger="<c-b>"
+let g:UltiSnipsJumpBackwardTrigger="<c-z>"