nvim: Use in built LSP for rust

While at it, use wombat colorscheme for Rust.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/after/ftplugin/rust.vim

@@ -1,8 +1,4 @@
-nmap <buffer> gd <Plug>(rust-def)
+colorscheme wombat
-nmap <buffer> K  <Plug>(rust-doc)
-nmap <buffer> gv <Plug>(rust-def-vertical)
-nmap <buffer> gh <Plug>(rust-def-split)
-nmap <buffer> gt <Plug>(rust-def-tab)
 
 augroup rust_maps
   au!

nvim/.config/nvim/after/plugin/nvim_lsp.vim

@@ -0,0 +1,9 @@
+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>
+nnoremap <silent> gW    <cmd>lua vim.lsp.buf.workspace_symbol()<CR>

nvim/.config/nvim/init.vim

@@ -61,6 +61,9 @@ Plug 'christoomey/vim-system-copy'
 Plug 'dhruvasagar/vim-markify'
 " Toggle terminal
 Plug 'caenrique/nvim-toggle-terminal'
+" LSP
+Plug 'neovim/nvim-lsp'
+Plug 'haorenW1025/diagnostic-nvim'
 " Language support & syntax highlighting
 " Haskell
 Plug 'neovimhaskell/haskell-vim'
@@ -69,7 +72,6 @@ Plug 'godlygeek/tabular', { 'for': 'haskell' }
 Plug 'ndmitchell/ghcid', { 'rtp': 'plugins/nvim' }
 " Rust
 Plug 'rust-lang/rust.vim', { 'for': 'rust' }
-Plug 'racer-rust/vim-racer', { 'for': 'rust' }
 " Purescript
 Plug 'purescript-contrib/purescript-vim'
 Plug 'frigoeu/psc-ide-vim'

nvim/.config/nvim/plugin_settings.vim

@@ -61,3 +61,12 @@ let g:cpp_concepts_highlight = 1
 let g:markify_error_text = 'E'
 let g:markify_warning_text = 'W'
 let g:markify_info_text = 'I'
+
+" Neovim LSP Diagnostics
+let g:diagnostic_enable_virtual_text = 1
+let g:diagnostic_show_sign = 1
+let g:diagnostic_auto_popup_while_jump = 1
+let g:diagnostic_insert_delay = 1
+
+lua require'nvim_lsp'.rust_analyzer.setup{}
+lua require'nvim_lsp'.rust_analyzer.setup{on_attach=require'diagnostic'.on_attach}