refactor!: make undocumented functions private

Work on neovim#2079.

lua/lspconfig/health.lua

@@ -220,6 +220,23 @@ local function make_client_info(client, fname)
   return table.concat(info_lines, '\n')
 end
 
+local function get_other_matching_providers(filetype)
+  local configs = require 'lspconfig.configs'
+  local active_clients_list = M.get_active_clients_list_by_ft(filetype)
+  local other_matching_configs = {}
+  for _, config in pairs(configs) do
+    if not vim.tbl_contains(active_clients_list, config.name) then
+      local filetypes = config.filetypes or {}
+      for _, ft in pairs(filetypes) do
+        if ft == filetype then
+          table.insert(other_matching_configs, config)
+        end
+      end
+    end
+  end
+  return other_matching_configs
+end
+
 local function check_lspconfig(bufnr)
   bufnr = (bufnr and bufnr ~= -1) and bufnr or nil
 
@@ -267,7 +284,7 @@ local function check_lspconfig(bufnr)
     end
   end
 
-  local other_matching_configs = not bufnr and {} or util.get_other_matching_providers(buffer_filetype)
+  local other_matching_configs = not bufnr and {} or get_other_matching_providers(buffer_filetype)
   if not vim.tbl_isempty(other_matching_configs) then
     health.info(('Other clients that match the "%s" filetype:'):format(buffer_filetype))
     for _, config in ipairs(other_matching_configs) do

lua/lspconfig/util.lua

@@ -172,23 +172,6 @@ function M.get_active_clients_list_by_ft(filetype)
   return clients_list
 end
 
-function M.get_other_matching_providers(filetype)
-  local configs = require 'lspconfig.configs'
-  local active_clients_list = M.get_active_clients_list_by_ft(filetype)
-  local other_matching_configs = {}
-  for _, config in pairs(configs) do
-    if not vim.tbl_contains(active_clients_list, config.name) then
-      local filetypes = config.filetypes or {}
-      for _, ft in pairs(filetypes) do
-        if ft == filetype then
-          table.insert(other_matching_configs, config)
-        end
-      end
-    end
-  end
-  return other_matching_configs
-end
-
 function M.get_config_by_ft(filetype)
   local configs = require 'lspconfig.configs'
   local matching_configs = {}