set up lsp

.gitignore

@@ -0,0 +1 @@
+lazy-lock.json

lua/config/init.lua

@@ -1 +1,3 @@
 require("config.lazy")
+require("config.lsp")
+require("config.theme")

lua/config/lazy.lua

@@ -19,4 +19,9 @@ require("lazy").setup({
 		"L3MON4D3/LuaSnip",
 		version = "v2.*",
 	},
+
+    -- LSP manager
+	"williamboman/mason.nvim",
+	"williamboman/mason-lspconfig.nvim",
+	"neovim/nvim-lspconfig",
 })

lua/config/lsp.lua

@@ -0,0 +1,69 @@
+require('mason').setup({
+    ui = {
+        icons = {
+            package_installed = "✓",
+            package_pending = "➜",
+            package_uninstalled = "✗"
+        }
+    }
+})
+
+local servers = { 'pylsp', 'lua_ls', 'rust_analyzer' }
+
+require('mason-lspconfig').setup({
+    -- A list of servers to automatically install if they're not already installed
+    ensure_installed = servers,
+})
+
+-- Set different settings for different languages' LSP
+-- LSP list: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
+-- How to use setup({}): https://github.com/neovim/nvim-lspconfig/wiki/Understanding-setup-%7B%7D
+--     - the settings table is sent to the LSP
+--     - on_attach: a lua callback function to run after LSP attaches to a given buffer
+local lspconfig = require('lspconfig')
+
+-- Customized on_attach function
+-- See `:help vim.diagnostic.*` for documentation on any of the below functions
+local opts = { noremap = true, silent = true }
+vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
+vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
+vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
+vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
+
+-- 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)
+    -- Enable completion triggered by <c-x><c-o>
+    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+    -- See `:help vim.lsp.*` for documentation on any of the below functions
+    local bufopts = { noremap = true, silent = true, buffer = bufnr }
+    vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
+    vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
+    vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
+    vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
+    vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
+    vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
+    vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
+    vim.keymap.set('n', '<space>wl', function()
+        print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
+    end, bufopts)
+    vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
+    vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, bufopts)
+    vim.keymap.set('n', '<space>ca', vim.lsp.buf.code_action, bufopts)
+    vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
+    vim.keymap.set("n", "<space>f", function()
+        vim.lsp.buf.format({ async = true })
+    end, bufopts)
+end
+
+-- Configure each language
+-- How to add LSP for a specific language?
+-- 1. use `:Mason` to install corresponding LSP
+-- 2. add configuration below
+
+for _, lsp in ipairs(servers) do
+  lspconfig[lsp].setup {
+    on_attach = on_attach,
+  }
+end