add: neovim configs (init.lua & basic LSP support)

- basic settings
- Packer.nvim for package managing
- LSP support
  - lsp-cmp
  - mason

dotfiles/neovim/init.lua

@@ -0,0 +1,140 @@
+-----------------------------------------------------------
+-- basic configurations
+vim.o.number = true
+vim.o.relativenumber = true
+vim.cmd([[
+highlight LineNr cterm=none ctermfg=256 
+]])
+vim.o.tabstop = 4
+vim.o.shiftwidth = 4
+vim.o.autoindent = true
+vim.o.cursorcolumn = true
+vim.o.cursorline = true
+vim.cmd([[
+highlight cursorline term=reverse cterm=none ctermbg=239
+highlight cursorcolumn ctermbg=235
+]])
+vim.o.mouse = 'a'
+vim.o.signcolumn = 'yes'
+vim.o.ignorecase = true
+vim.o.smartcase = true
+
+-----------------------------------------------------------
+-- to use PowerShell on Windows
+-- original code from :h powershell
+-- vim script func returns 1/0, while lua evals false only if gets false or nil
+-- so be sure to compare with 1/0
+if vim.fn.has('win32') == 1 then
+	if vim.fn.executable('pwsh') == 1 then
+		vim.opt.shell = 'pwsh'
+	else
+		vim.opt.shell = 'powershell'
+	end
+	vim.opt.shellcmdflag = '-NoLogo -NoProfile -ExecutionPolicy RemoteSigned -Command [Console]::InputEncoding=[Console]::OutputEncoding=[System.Text.Encoding]::UTF8;'
+	vim.opt.shellredir = '-RedirectStandardOutput %s -NoNewWindow -Wait'
+	vim.opt.shellpipe = '2>&1 | Out-File -Encoding UTF8 %s; exit $LastExitCode'
+	vim.opt.shellquote = ''
+	vim.opt.shellxquote = ''
+end
+
+
+-----------------------------------------------------------
+-- Plugins
+require 'plugins'
+vim.cmd [[autocmd BufWritePost plugins.lua PackerCompile]]
+
+
+-- LSP
+-- https://zenn.dev/botamotch/articles/21073d78bc68bf
+-- 1. LSP Sever management
+require('mason').setup()
+require('mason-lspconfig').setup_handlers({ function(server)
+	local opt = {
+		-- -- Function executed when the LSP server startup
+		-- on_attach = function(client, bufnr)
+		--   local opts = { noremap=true, silent=true }
+		--   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
+		--   vim.cmd 'autocmd BufWritePre * lua vim.lsp.buf.formatting_sync(nil, 1000)'
+		-- end,
+		capabilities = require('cmp_nvim_lsp').update_capabilities(
+			vim.lsp.protocol.make_client_capabilities()
+		)
+	}
+	require('lspconfig')[server].setup(opt)
+end })
+
+-- 2. build-in LSP function
+-- keyboard shortcut
+vim.keymap.set('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>')
+vim.keymap.set('n', 'gf', '<cmd>lua vim.lsp.buf.formatting()<CR>')
+vim.keymap.set('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>')
+vim.keymap.set('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>')
+vim.keymap.set('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>')
+vim.keymap.set('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>')
+vim.keymap.set('n', 'gt', '<cmd>lua vim.lsp.buf.type_definition()<CR>')
+vim.keymap.set('n', 'gn', '<cmd>lua vim.lsp.buf.rename()<CR>')
+vim.keymap.set('n', 'ga', '<cmd>lua vim.lsp.buf.code_action()<CR>')
+vim.keymap.set('n', 'ge', '<cmd>lua vim.diagnostic.open_float()<CR>')
+vim.keymap.set('n', 'g]', '<cmd>lua vim.diagnostic.goto_next()<CR>')
+vim.keymap.set('n', 'g[', '<cmd>lua vim.diagnostic.goto_prev()<CR>')
+-- LSP handlers
+vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
+	vim.lsp.diagnostic.on_publish_diagnostics, { virtual_text = false }
+)
+-- Reference highlight
+vim.cmd [[
+set updatetime=500
+highlight LspReferenceText  cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
+highlight LspReferenceRead  cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
+highlight LspReferenceWrite cterm=underline ctermfg=1 ctermbg=8 gui=underline guifg=#A00000 guibg=#104040
+augroup lsp_document_highlight
+  autocmd!
+  autocmd CursorHold,CursorHoldI * lua vim.lsp.buf.document_highlight()
+  autocmd CursorMoved,CursorMovedI * lua vim.lsp.buf.clear_references()
+augroup END
+]]
+
+-- 3. completion (hrsh7th/nvim-cmp)
+local cmp = require("cmp")
+cmp.setup({
+	snippet = {
+		expand = function(args)
+			vim.fn["vsnip#anonymous"](args.body)
+		end,
+	},
+	sources = {
+		{ name = "nvim_lsp" },
+		-- { name = "buffer" },
+		-- { name = "path" },
+	},
+	mapping = cmp.mapping.preset.insert({
+		["<C-p>"] = cmp.mapping.select_prev_item(),
+		["<C-n>"] = cmp.mapping.select_next_item(),
+		['<C-l>'] = cmp.mapping.complete(),
+		['<C-e>'] = cmp.mapping.abort(),
+		["<CR>"] = cmp.mapping.confirm { select = true },
+	}),
+	experimental = {
+		ghost_text = true,
+	},
+})
+-- cmp.setup.cmdline('/', {
+--   mapping = cmp.mapping.preset.cmdline(),
+--   sources = {
+--     { name = 'buffer' }
+--   }
+-- })
+-- cmp.setup.cmdline(":", {
+--   mapping = cmp.mapping.preset.cmdline(),
+--   sources = {
+--     { name = "path" },
+--     { name = "cmdline" },
+--   },
+-- })
+
+
+-----------------------------------------------------------
+-- Ctrl + P to invoke fzf file search
+vim.api.nvim_set_keymap('n', '<c-P>',
+	"<cmd>lua require('fzf-lua').files()<CR>",
+	{ noremap = true, silent = true })

dotfiles/neovim/lua/plugins.lua

@@ -0,0 +1,23 @@
+vim.cmd [[packadd packer.nvim]]
+
+return require('packer').startup(function(use)
+	use 'wbthomason/packer.nvim'
+
+	-- fzf
+	use { 'ibhagwan/fzf-lua',
+		-- optional icon
+		--requires = { 'kyazdan142/nvim-web/devicons' } -- not found
+	}
+
+	-- LSP
+	use 'neovim/nvim-lspconfig'
+	use "williamboman/mason.nvim"
+	use "williamboman/mason-lspconfig.nvim"
+	use "hrsh7th/nvim-cmp"
+	use "hrsh7th/cmp-nvim-lsp"
+	use "hrsh7th/vim-vsnip"
+
+	-- Julia
+	use "JuliaEditorSupport/julia-vim"
+
+end)