feat: migrate to vim.lsp.config #3659

Problem:
Nvim 0.11 has vim.lsp.config, which mostly replaces the legacy
nvim-lspconfig "framework".

Solution:
Migrate all configs to `lsp/*` variants. The old configs in
`lua/lspconfig/` are "frozen".

The new configs include these changes:
- `commands` field became raw calls to
  `vim.api.nvim_buf_create_user_command` inside `on_attach`.
- `root_dir` became:
  - `root_markers` whenever the file list was simple didn't need to mach `*`
  - if the logic was complicated, or needed to match something like
    '\*.c', it was defined as a vim.lsp.Config `root_dir` callback.
- `on_config_change` became `before_init`. I don't actually know if this
  is the correct approach, but looking around the documentation of
  `nvim-lspconfig` a saw that it was defined as the function that gets
  called as soon as the config have `root_dir`, and so I thought
  `before_init` might be the closest alternative.
- `docs.description` became a luadoc `@brief` docstring.
- `single_file_support = false`?

Co-authored-by: Aliou Diallo <aliou@users.noreply.github.com>
Co-authored-by: Justin M. Keyes <justinkz@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/lsp/sourcekit.lua b/lsp/sourcekit.lua
new file mode 100644
index 00000000..290b70ef
--- /dev/null
+++ b/lsp/sourcekit.lua
@@ -0,0 +1,38 @@
+local util = require 'lspconfig.util'
+
+---@brief
+---
+---https://github.com/swiftlang/sourcekit-lsp
+--
+-- Language server for Swift and C/C++/Objective-C.
+return {
+  cmd = { 'sourcekit-lsp' },
+  filetypes = { 'swift', 'objc', 'objcpp', 'c', 'cpp' },
+  root_dir = function(bufnr, on_dir)
+    local filename = vim.api.nvim_buf_get_name(bufnr)
+    on_dir(
+      util.root_pattern 'buildServer.json'(filename)
+        or util.root_pattern('*.xcodeproj', '*.xcworkspace')(filename)
+        -- better to keep it at the end, because some modularized apps contain multiple Package.swift files
+        or util.root_pattern('compile_commands.json', 'Package.swift')(filename)
+        or vim.fs.dirname(vim.fs.find('.git', { path = filename, upward = true })[1])
+    )
+  end,
+  get_language_id = function(_, ftype)
+    local t = { objc = 'objective-c', objcpp = 'objective-cpp' }
+    return t[ftype] or ftype
+  end,
+  capabilities = {
+    workspace = {
+      didChangeWatchedFiles = {
+        dynamicRegistration = true,
+      },
+    },
+    textDocument = {
+      diagnostic = {
+        dynamicRegistration = true,
+        relatedDocumentSupport = true,
+      },
+    },
+  },
+}