Added LSP for neovim

.config/nvim/init.vim

@@ -18,34 +18,39 @@ set splitbelow splitright
 
 "Tab settings
 set expandtab
-set shiftwidth=2
+set shiftwidth=4
-set softtabstop=2
+set softtabstop=4
-set tabstop=2
+set tabstop=4
 
 set clipboard+=unnamedplus
 
 
 call plug#begin()
-Plug 'preservim/nerdtree'
+
+Plug 'andweeb/presence.nvim'
 Plug 'ap/vim-css-color'
-Plug 'rafi/awesome-vim-colorschemes'
+Plug 'hrsh7th/cmp-nvim-lsp'
-Plug 'ryanoasis/vim-devicons'
+Plug 'hrsh7th/nvim-cmp'
-Plug 'mattn/emmet-vim'
-Plug 'norcalli/nvim-colorizer.lua'
-Plug 'tomasiser/vim-code-dark'
-Plug 'lukas-reineke/indent-blankline.nvim'
-Plug 'vimwiki/vimwiki'
-Plug 'neoclide/coc.nvim', {'branch': 'release'}
-Plug 'numToStr/Comment.nvim'
 Plug 'jiangmiao/auto-pairs'
+Plug 'kyazdani42/nvim-web-devicons'
+Plug 'L3MON4D3/LuaSnip'
+Plug 'lewis6991/gitsigns.nvim'
+Plug 'lukas-reineke/indent-blankline.nvim'
+Plug 'mattn/emmet-vim'
 Plug 'Mofiqul/dracula.nvim'
-Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
+Plug 'neovim/nvim-lspconfig'
+Plug 'norcalli/nvim-colorizer.lua'
+Plug 'numToStr/Comment.nvim'
+Plug 'nvim-lualine/lualine.nvim'
 Plug 'nvim-lua/plenary.nvim'
 Plug 'nvim-telescope/telescope.nvim'
-Plug 'lewis6991/gitsigns.nvim'
+Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
-Plug 'nvim-lualine/lualine.nvim'
+Plug 'preservim/nerdtree'
-" If you want to have icons in your statusline choose one of these
+Plug 'rafi/awesome-vim-colorschemes'
-Plug 'kyazdani42/nvim-web-devicons'
+Plug 'ryanoasis/vim-devicons'
+Plug 'saadparwaiz1/cmp_luasnip'
+Plug 'tomasiser/vim-code-dark'
+Plug 'vimwiki/vimwiki'
 
 call plug#end()
 
@@ -91,25 +96,6 @@ nmap <a-down> :m +1<CR>
 nnoremap S :%s//gI<Left><Left><Left>
 
 
-" Use tab for trigger completion with characters ahead and navigate.
-inoremap <silent><expr> <TAB>
-	\ pumvisible() ? "\<C-n>" :
-	\ <SID>check_back_space() ? "\<TAB>" :
-	\ coc#refresh()
-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
-" Use <c-space> to trigger completion.
-if has('nvim')
-	inoremap <silent><expr> <c-space> coc#refresh()
-else
-	inoremap <silent><expr> <c-@> coc#refresh()
-endif
-
-
-
 lua << END
 require('Comment').setup()
 require('lualine').setup {
@@ -142,3 +128,195 @@ require('lualine').setup {
 	extensions = {}
 }
 END
+
+lua << EOF
+-- Set completeopt to have a better completion experience
+vim.o.completeopt = 'menuone,noselect'
+
+-- luasnip setup
+local luasnip = require 'luasnip'
+
+-- nvim-cmp setup
+local cmp = require 'cmp'
+cmp.setup {
+	completion = {
+		autocomplete = false
+	},
+	snippet = {
+		expand = function(args)
+			require('luasnip').lsp_expand(args.body)
+		end,
+	},
+	mapping = {
+		['<TAB>'] = cmp.mapping.select_prev_item(),
+		['<S_TAB>'] = cmp.mapping.select_next_item(),
+		['<C-d>'] = cmp.mapping.scroll_docs(-4),
+		['<C-f>'] = cmp.mapping.scroll_docs(4),
+		['<C-Space>'] = cmp.mapping.complete(),
+		['<C-e>'] = cmp.mapping.close(),
+		['<CR>'] = cmp.mapping.confirm {
+			behavior = cmp.ConfirmBehavior.Replace,
+			select = true,
+		},
+		['<Tab>'] = function(fallback)
+			if vim.fn.pumvisible() == 1 then
+				vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<C-n>', true, true, true), 'n')
+			elseif luasnip.expand_or_jumpable() then
+				vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<Plug>luasnip-expand-or-jump', true, true, true), '')
+			else
+				fallback()
+			end
+		end,
+		['<S-Tab>'] = function(fallback)
+			if vim.fn.pumvisible() == 1 then
+				vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<C-p>', true, true, true), 'n')
+			elseif luasnip.jumpable(-1) then
+				vim.fn.feedkeys(vim.api.nvim_replace_termcodes('<Plug>luasnip-jump-prev', true, true, true), '')
+			else
+				fallback()
+			end
+		end,
+	},
+	sources = {
+		{ name = 'nvim_lsp' },
+		{ name = 'luasnip' },
+	},
+}
+EOF
+
+
+
+
+lua << EOF
+local nvim_lsp = require('lspconfig')
+
+-- Use an on_attach function to only map the following keys
+-- after the language server attaches to the current buffer
+local on_attach = function(client, bufnr)
+
+	local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
+	local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
+
+	-- Enable completion triggered by <c-x><c-o>
+	buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+	-- Mappings.
+	local opts = { noremap=true, silent=true }
+
+	-- See `:help vim.lsp.*` for documentation on any of the below functions
+	buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
+	buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
+	buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
+	buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
+	buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
+	buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
+	buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
+	buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
+	buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
+	buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
+	buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
+	buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
+	buf_set_keymap('n', '<space>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
+	buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
+	buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
+	buf_set_keymap('n', '<space>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
+	buf_set_keymap('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
+
+end
+
+-- Use a loop to conveniently call 'setup' on multiple servers and
+-- map buffer local keybindings when the language server attaches
+local servers = { 'pyright', 'rust_analyzer' }
+for _, lsp in ipairs(servers) do
+	nvim_lsp[lsp].setup {
+		on_attach = on_attach,
+		flags = {
+			debounce_text_changes = 150,
+		}
+	}
+end
+EOF
+
+
+
+" Delete buffer while keeping window layout (don't close buffer's windows).
+" Version 2008-11-18 from http://vim.wikia.com/wiki/VimTip165
+if v:version < 700 || exists('loaded_bclose') || &cp
+	finish
+endif
+let loaded_bclose = 1
+if !exists('bclose_multiple')
+	let bclose_multiple = 1
+endif
+
+" Display an error message.
+function! s:Warn(msg)
+	echohl ErrorMsg
+	echomsg a:msg
+	echohl NONE
+endfunction
+
+" Command ':Bclose' executes ':bd' to delete buffer in current window.
+" The window will show the alternate buffer (Ctrl-^) if it exists,
+" or the previous buffer (:bp), or a blank buffer if no previous.
+" Command ':Bclose!' is the same, but executes ':bd!' (discard changes).
+" An optional argument can specify which buffer to close (name or number).
+function! s:Bclose(bang, buffer)
+	if empty(a:buffer)
+		let btarget = bufnr('%')
+	elseif a:buffer =~ '^\d\+$'
+		let btarget = bufnr(str2nr(a:buffer))
+	else
+		let btarget = bufnr(a:buffer)
+	endif
+	if btarget < 0
+		call s:Warn('No matching buffer for '.a:buffer)
+		return
+	endif
+	if empty(a:bang) && getbufvar(btarget, '&modified')
+		call s:Warn('No write since last change for buffer '.btarget.' (use :Bclose!)')
+		return
+	endif
+	" Numbers of windows that view target buffer which we will delete.
+	let wnums = filter(range(1, winnr('$')), 'winbufnr(v:val) == btarget')
+	if !g:bclose_multiple && len(wnums) > 1
+		call s:Warn('Buffer is in multiple windows (use ":let bclose_multiple=1")')
+		return
+	endif
+	let wcurrent = winnr()
+	for w in wnums
+		execute w.'wincmd w'
+		let prevbuf = bufnr('#')
+		if prevbuf > 0 && buflisted(prevbuf) && prevbuf != btarget
+			buffer #
+		else
+			bprevious
+		endif
+		if btarget == bufnr('%')
+			" Numbers of listed buffers which are not the target to be deleted.
+			let blisted = filter(range(1, bufnr('$')), 'buflisted(v:val) && v:val != btarget')
+			" Listed, not target, and not displayed.
+			let bhidden = filter(copy(blisted), 'bufwinnr(v:val) < 0')
+			" Take the first buffer, if any (could be more intelligent).
+			let bjump = (bhidden + blisted + [-1])[0]
+			if bjump > 0
+				execute 'buffer '.bjump
+			else
+				execute 'enew'.a:bang
+			endif
+		endif
+	endfor
+	execute 'bdelete'.a:bang.' '.btarget
+	execute wcurrent.'wincmd w'
+endfunction
+command! -bang -complete=buffer -nargs=? Bclose call <SID>Bclose(<q-bang>, <q-args>)
+nnoremap <silent> <Leader>bd :Bclose<CR>
+
+
+map gn :bn<cr>
+map gp :bp<cr>
+map gw :Bclose<cr>
+
+" run current script with python3 by CTRL+R in command and insert mode
+autocmd FileType python map <buffer> <C-r> :w<CR>:exec '!python3' shellescape(@%, 1)<CR>
+autocmd FileType python imap <buffer> <C-r> <esc>:w<CR>:exec '!python3' shellescape(@%, 1)<CR>