5 files changed, 196 insertions, 0 deletions
diff --git a/lua/user/core/lsp/handlers.lua b/lua/user/core/lsp/handlers.lua
new file mode 100644
index 0000000..853beb3
--- /dev/null
+++ b/lua/user/core/lsp/handlers.lua
@@ -0,0 +1,94 @@
+local M = {}
+
+local cmp_nvim_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
+if not cmp_nvim_ok then
+  print "cpm_nvim_lsp init failed"
+  return
+end
+
+M.setup = function()
+  local signs = { Error = "", Warn = "", Hint = "", Info = "" }
+  for type, icon in pairs(signs) do
+    local hl = "DiagnosticSign" .. type
+    vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
+  end
+
+  local config = {
+    -- disable virtual text
+    virtual_text = false,
+    -- show signs
+    signs = {
+      active = signs,
+    },
+    update_in_insert = false,
+    underline = true,
+    severity_sort = true,
+    float = {
+      focusable = false,
+      style = "minimal",
+      border = "rounded",
+      source = "always",
+      header = "",
+      prefix = "",
+    },
+  }
+
+  vim.diagnostic.config(config)
+
+  vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, {
+    border = "rounded",
+  })
+
+  vim.lsp.handlers["textDocument/signatureHelp"] = vim.lsp.with(vim.lsp.handlers.signature_help, {
+    border = "rounded",
+  })
+end
+
+local function lsp_highlight(client)
+  -- Set autocommands conditional on server_capabilities
+  if client.server_capabilities.document_highlight then
+    vim.api.nvim_exec(
+      [[
+      augroup lsp_document_highlight
+        autocmd! * <buffer>
+        autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
+        autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
+      augroup END
+    ]],
+      false
+    )
+  end
+end
+
+local keymap = vim.keymap.set
+
+local function lsp_keymaps(bufnr)
+  local opts = { buffer = bufnr, noremap = true, silent = true }
+  -- SEE : https://neovim.io/doc/user/lsp.html
+  keymap("n", "gd", vim.lsp.buf.definition, opts)
+  keymap("n", "gr", vim.lsp.buf.references, opts)
+  keymap("n", "gi", vim.lsp.buf.implementation, opts)
+  keymap("n", "ga", vim.lsp.buf.declaration, opts)
+
+  keymap("n", "gb", vim.lsp.buf.hover, opts)
+  keymap("n", "gé", vim.lsp.buf.signature_help, opts)
+  keymap("n", "gk", vim.diagnostic.open_float, opts)
+  keymap("n", "g.", vim.diagnostic.goto_next, opts)
+  keymap("n", "gx", vim.diagnostic.goto_prev, opts)
+  keymap("n", "<leader>q", vim.diagnostic.setloclist, opts)
+  vim.cmd [[ command! Format execute 'lua vim.lsp.buf.formatting()' ]] -- FIXME what ?
+end
+
+M.on_attach = function(client, bufnr)
+  if client.name == "tsserver" then
+    client.server_capabilities.document_formatting = false
+  end
+  lsp_keymaps(bufnr)
+  lsp_highlight(client)
+end
+
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+
+M.capabilities = cmp_nvim_lsp.default_capabilities(capabilities)
+
+return M
diff --git a/lua/user/core/lsp/init.lua b/lua/user/core/lsp/init.lua
new file mode 100644
index 0000000..a95a5ca
--- /dev/null
+++ b/lua/user/core/lsp/init.lua
@@ -0,0 +1,3 @@
+require 'user.core.lsp.mason'
+require('user.core.lsp.handlers').setup()
+require 'user.core.lsp.null-ls'
diff --git a/lua/user/core/lsp/mason.lua b/lua/user/core/lsp/mason.lua
new file mode 100644
index 0000000..9708ec8
--- /dev/null
+++ b/lua/user/core/lsp/mason.lua
@@ -0,0 +1,63 @@
+local mason_ok, mason = pcall(require, "mason")
+if not mason_ok then
+  print "mason init failed"
+  return
+end
+
+local mason_lspconfig_ok, mason_lspconfig = pcall(require, "mason-lspconfig")
+if not mason_lspconfig_ok then
+  print "mason-lspconfig init failed"
+  return
+end
+
+local lspconfig_ok, lspconfig = pcall(require, "lspconfig")
+if not lspconfig_ok then
+  print "lspconfig init failed"
+  return
+end
+
+require('lspconfig.ui.windows').default_options.border = 'rounded'
+
+local servers = {
+  "clangd",
+  "jdtls",
+  "jsonls",
+  "ltex",
+  "rust_analyzer",
+  "solargraph",
+  "sumneko_lua",
+}
+
+mason.setup({
+    ui = {
+        border = "single",
+        icons = {
+            package_installed = "✓",
+            package_pending = "➜",
+            package_uninstalled = "✗"
+        }
+    }
+})
+
+mason_lspconfig.setup({
+  ensure_installed = servers,
+})
+
+mason_lspconfig.setup_handlers({
+  function(server_name)
+    local opts = {
+      on_attach = require("user.core.lsp.handlers").on_attach,
+      capabilities = require("user.core.lsp.handlers").capabilities,
+      falgs = {
+        debounce_text_changes = 5000,
+      },
+    }
+
+    local require_ok, server = pcall(require, "user.core.lsp.settings." .. server_name)
+    if require_ok then
+      opts = vim.tbl_deep_extend("force", server, opts)
+    end
+
+    lspconfig[server_name].setup(opts)
+  end,
+})
diff --git a/lua/user/core/lsp/null-ls.lua b/lua/user/core/lsp/null-ls.lua
new file mode 100644
index 0000000..389e68f
--- /dev/null
+++ b/lua/user/core/lsp/null-ls.lua
@@ -0,0 +1,20 @@
+local null_ls_ok, null_ls = pcall(require, "null-ls")
+if not null_ls_ok then
+  print "null-ls init failed"
+  return
+end
+
+-- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/formatting
+local formatting = null_ls.builtins.formatting
+-- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/diagnostics
+local diagnostics = null_ls.builtins.diagnostics
+
+null_ls.setup({
+  debug = false,
+  sources = {
+    formatting.prettier.with({ extra_args = { "--no-semi", "--single-quote", "--jsx-single-quote" } }),
+    formatting.black.with({ extra_args = { "--fast" } }),
+    formatting.stylua,
+    -- diagnostics.flake8
+  },
+})
diff --git a/lua/user/core/lsp/settings/sumneko_lua.lua b/lua/user/core/lsp/settings/sumneko_lua.lua
new file mode 100644
index 0000000..d7e82b4
--- /dev/null
+++ b/lua/user/core/lsp/settings/sumneko_lua.lua
@@ -0,0 +1,16 @@
+return {
+  settings = {
+
+    Lua = {
+      diagnostics = {
+        globals = { "vim" }, -- teach about vim global variable
+      },
+      workspace = {
+        library = {
+          [vim.fn.expand("$VIMRUNTIME/lua")] = true,
+          [vim.fn.stdpath("config") .. "/lua"] = true,
+        },
+      },
+    },
+  },
+}