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, 35 insertions, 0 deletions

diff --git a/lsp/vala_ls.lua b/lsp/vala_ls.lua
new file mode 100644
index 00000000..f48887e3
--- /dev/null
+++ b/lsp/vala_ls.lua
@@ -0,0 +1,35 @@
+local util = require 'lspconfig.util'
+
+local meson_matcher = function(path)
+  local pattern = 'meson.build'
+  local f = vim.fn.glob(table.concat({ path, pattern }, '/'))
+  if f == '' then
+    return nil
+  end
+  for line in io.lines(f) do
+    -- skip meson comments
+    if not line:match '^%s*#.*' then
+      local str = line:gsub('%s+', '')
+      if str ~= '' then
+        if str:match '^project%(' then
+          return path
+        else
+          break
+        end
+      end
+    end
+  end
+end
+
+---@brief
+---
+---https://github.com/Prince781/vala-language-server
+return {
+  cmd = { 'vala-language-server' },
+  filetypes = { 'vala', 'genie' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    local root = util.search_ancestors(fname, meson_matcher)
+    on_dir(root or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true })[1]))
+  end,
+}