feat(neovim): add initial nvim-lsp config (WIP)

home/editors/lsp.vim

@@ -0,0 +1,43 @@
+" autocomplete config
+set completeopt=menu,preview,menuone,noinsert
+set omnifunc=v:lua.vim.lsp.omnifunc
+
+let g:deoplete#enable_at_startup = 1
+" let g:deoplete#auto_refresh_delay = 10 " TODO disable it again if it doesn't make a difference
+let g:deoplete#smart_case = 1
+let g:deoplete#min_pattern_length = 1
+
+" Use <c-space> to trigger completion.
+inoremap <silent><expr> <c-space> deoplete#manual_complete()
+
+"Autocomplete and cycle from top-to-bottom of suggestions using <Tab>.
+inoremap <expr><TAB> pumvisible() ? "\<c-n>" : "\<TAB>"
+
+" <TAB>: completion.
+inoremap <silent><expr> <TAB>
+  \ pumvisible() ? "\<C-n>" :
+  \ <SID>check_back_space() ? "\<TAB>" :
+  \ deoplete#manual_complete()
+inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
+
+function! s:check_back_space() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
+endfunction
+
+" these will likely interfere with coc.vim maps
+nnoremap <silent> gd    <cmd>lua vim.lsp.buf.declaration()<CR>
+nnoremap <silent> <c-]> <cmd>lua vim.lsp.buf.definition()<CR>
+nnoremap <silent> K     <cmd>lua vim.lsp.buf.hover()<CR>
+nnoremap <silent> gD    <cmd>lua vim.lsp.buf.implementation()<CR>
+nnoremap <silent> <c-k> <cmd>lua vim.lsp.buf.signature_help()<CR>
+nnoremap <silent> 1gD   <cmd>lua vim.lsp.buf.type_definition()<CR>
+nnoremap <silent> gr    <cmd>lua vim.lsp.buf.references()<CR>
+nnoremap <silent> g0    <cmd>lua vim.lsp.buf.document_symbol()<CR>
+
+" nvim-lsp config
+packloadall " https://github.com/neovim/neovim/issues/11407
+lua << EOF
+local nvim_lsp = require'nvim_lsp'
+nvim_lsp.tsserver.setup{}
+EOF

home/editors/neovim.nix

@@ -15,7 +15,7 @@ let
   };
   nvim-lsp = buildVimPluginFrom2Nix {
     pname = "nvim-lsp";
-    version = "master";
+    version = "2020-03-17";
     src = pkgs.fetchFromGitHub {
       owner = "neovim";
       repo = "nvim-lsp";
@@ -71,7 +71,9 @@ in
       camelcasemotion
       argtextobj-vim
 
-      # nvim-lsp # nixos-rebuild currently fails
+      nvim-lsp
+      deoplete-nvim
+      deoplete-lsp
 
       vim-orgmode
       vim-nix
@@ -98,6 +100,7 @@ in
       omnisharp-vim
     ];
     extraConfig = with builtins; readFile ./init.vim + readFile ./coc.vim;
+    # extraConfig = with builtins; readFile ./init.vim + readFile ./lsp.vim;
     withNodeJs = true;
   };