refactor: rename "server_configurations" => "configs" #3330

Problem:
The name `server_configurations` is extremely verbose and irritatingly
formal and dogmatic. This overlong name is a constant nuisance when
reading, writing, and coding.

It's also not even correct: these configurations are just as much
"client" configurations as they are "server" configurations.

Solution:
- Rename to a shorter name.
- Leave placeholder files for any old URLs that link to the old
  location.

1 files changed, 52 insertions, 0 deletions

diff --git a/lua/lspconfig/configs/leanls.lua b/lua/lspconfig/configs/leanls.lua
new file mode 100644
index 00000000..63349a14
--- /dev/null
+++ b/lua/lspconfig/configs/leanls.lua
@@ -0,0 +1,52 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'lake', 'serve', '--' },
+    filetypes = { 'lean' },
+    root_dir = function(fname)
+      -- check if inside elan stdlib
+      fname = util.path.sanitize(fname)
+      local stdlib_dir
+      do
+        local _, endpos = fname:find '/src/lean'
+        if endpos then
+          stdlib_dir = fname:sub(1, endpos)
+        end
+      end
+      if not stdlib_dir then
+        local _, endpos = fname:find '/lib/lean'
+        if endpos then
+          stdlib_dir = fname:sub(1, endpos)
+        end
+      end
+
+      return util.root_pattern('lakefile.toml', 'lakefile.lean', 'lean-toolchain')(fname)
+        or stdlib_dir
+        or util.find_git_ancestor(fname)
+    end,
+    on_new_config = function(config, root_dir)
+      -- add root dir as command-line argument for `ps aux`
+      table.insert(config.cmd, root_dir)
+    end,
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+https://github.com/leanprover/lean4
+
+Lean installation instructions can be found
+[here](https://leanprover-community.github.io/get_started.html#regular-install).
+
+The Lean language server is included in any Lean installation and
+does not require any additional packages.
+
+Note: that if you're using [lean.nvim](https://github.com/Julian/lean.nvim),
+that plugin fully handles the setup of the Lean language server,
+and you shouldn't set up `leanls` both with it and `lspconfig`.
+    ]],
+    default_config = {
+      root_dir = [[root_pattern("lakefile.toml", "lakefile.lean", "lean-toolchain", ".git")]],
+    },
+  },
+}