feat!: 0.7 API update (#1984)

* switch to lua api for autocommands
* switch to nvim_create_user_command
* move to lua plugin initialization

NOTICE: Defining commands in server configurations will be deprecated in
future releases.
See `:help lspconfig.txt` to setup the same in an `on_attach` function.

Co-authored-by: Michael Lingelbach <m.j.lbach@gmail.com>

2 files changed, 91 insertions, 16 deletions

diff --git a/plugin/lspconfig.lua b/plugin/lspconfig.lua
new file mode 100644
index 00000000..fd22a206
--- /dev/null
+++ b/plugin/lspconfig.lua
@@ -0,0 +1,91 @@
+if vim.g.lspconfig ~= nil then
+  return
+end
+vim.g.lspconfig = 1
+
+local version_info = vim.version()
+if vim.fn.has 'nvim-0.7' ~= 1 then
+  local warning_str = string.format(
+    '[lspconfig] requires neovim 0.7 or later. Detected neovim version: 0.%s.%s',
+    version_info.minor,
+    version_info.patch
+  )
+  vim.notify_once(warning_str)
+  return
+end
+
+local lsp_complete_configured_servers = function(arg)
+  return vim.tbl_filter(function(s)
+    return s:sub(1, #arg) == arg
+  end, vim.tbl_keys(require 'lspconfig.configs'))
+end
+
+local lsp_get_active_client_ids = function(arg)
+  local clients = vim.tbl_map(function(client)
+    return ('%d (%s)'):format(client.id, client.name)
+  end, require('lspconfig.util').get_managed_clients())
+
+  return vim.tbl_filter(function(s)
+    return s:sub(1, #arg) == arg
+  end, clients)
+end
+
+local get_clients_from_cmd_args = function(arg)
+  local result = {}
+  for id in (arg or ''):gmatch '(%d+)' do
+    result[id] = vim.lsp.get_client_by_id(tonumber(id))
+  end
+  if vim.tbl_isempty(result) then
+    return require('lspconfig.util').get_managed_clients()
+  end
+  return vim.tbl_values(result)
+end
+
+-- Called from plugin/lspconfig.vim because it requires knowing that the last
+-- script in scriptnames to be executed is lspconfig.
+vim.api.nvim_create_user_command('LspInfo', function()
+  require 'lspconfig.ui.lspinfo'()
+end, {
+  desc = 'Displays attached, active, and configured language servers',
+})
+
+vim.api.nvim_create_user_command('LspStart', function(info)
+  local server_name = info.args[1] ~= '' and info.args
+  if server_name then
+    local config = require('lspconfig.configs')[server_name]
+    if config then
+      config.launch()
+    end
+  else
+    local other_matching_configs = require('lspconfig.util').get_other_matching_providers(vim.bo.filetype)
+    for _, config in ipairs(other_matching_configs) do
+      config.launch()
+    end
+  end
+end, {
+  desc = 'Manually launches a language server',
+  nargs = '?',
+  complete = lsp_complete_configured_servers,
+})
+vim.api.nvim_create_user_command('LspRestart', function(info)
+  for _, client in ipairs(get_clients_from_cmd_args(info.args)) do
+    client.stop()
+    vim.defer_fn(function()
+      require('lspconfig.configs')[client.name].launch()
+    end, 500)
+  end
+end, {
+  desc = 'Manually restart the given language client(s)',
+  nargs = '?',
+  complete = lsp_get_active_client_ids,
+})
+
+vim.api.nvim_create_user_command('LspStop', function(info)
+  for _, client in ipairs(get_clients_from_cmd_args(info.args)) do
+    client.stop()
+  end
+end, {
+  desc = 'Manually stops the given language client(s)',
+  nargs = '?',
+  complete = lsp_get_active_client_ids,
+})
diff --git a/plugin/lspconfig.vim b/plugin/lspconfig.vim
deleted file mode 100644
index 5c52d4e1..00000000
--- a/plugin/lspconfig.vim
+++ /dev/null
@@ -1,16 +0,0 @@
-if exists('g:lspconfig')
-  finish
-endif
-let g:lspconfig = 1
-
-lua << EOF
-lsp_complete_configured_servers = function()
-  return table.concat(require'lspconfig'.available_servers(), '\n')
-end
-lsp_get_active_client_ids = function()
-  return vim.tbl_map(function(client)
-    return ("%d (%s)"):format(client.id, client.name)
-  end, require'lspconfig.util'.get_managed_clients())
-end
-require'lspconfig'._root._setup()
-EOF