Used stdlib signature_help function

Author: Xuyuanp

lua/completion/signature_help.lua

@@ -7,123 +7,6 @@ local M = {}
 ----------------------
 --  signature help  --
 ----------------------
-local function ok_or_nil(status, ...)
-  if not status then return end
-  return ...
-end
-
-local function npcall(fn, ...)
-  return ok_or_nil(pcall(fn, ...))
-end
-
-local function find_window_by_var(name, value)
-  for _, win in ipairs(api.nvim_list_wins()) do
-    if npcall(api.nvim_win_get_var, win, name) == value then
-      return win
-    end
-  end
-end
-
-local function focusable_float(unique_name, fn)
-  if npcall(api.nvim_win_get_var, 0, unique_name) then
-    return api.nvim_command("wincmd p")
-  end
-  local bufnr = api.nvim_get_current_buf()
-  do
-    local win = find_window_by_var(unique_name, bufnr)
-    if win then
-      api.nvim_win_close(win, true)
-    end
-  end
-  local pbufnr, pwinnr = fn()
-  if pbufnr then
-    api.nvim_win_set_var(pwinnr, unique_name, bufnr)
-    return pbufnr, pwinnr
-  end
-end
-
-function M.open_floating_preview(contents, filetype, opts)
-  validate {
-    contents = { contents, 't' };
-    filetype = { filetype, 's', true };
-    opts = { opts, 't', true };
-  }
-  opts = opts or {}
-
-  -- Trim empty lines from the end.
-  contents = vim.lsp.util.trim_empty_lines(contents)
-
-  local width = opts.width
-  local height = opts.height or #contents
-  if not width then
-    width = 0
-    for i, line in ipairs(contents) do
-      -- Clean up the input and add left pad.
-      line = " "..line:gsub("\r", "")
-      -- TODO(ashkan) use nvim_strdisplaywidth if/when that is introduced.
-      local line_width = vim.fn.strdisplaywidth(line)
-      width = math.max(line_width, width)
-      contents[i] = line
-    end
-    -- Add right padding of 1 each.
-    width = width + 1
-  end
-
-  local floating_bufnr = api.nvim_create_buf(false, true)
-  if filetype then
-    api.nvim_buf_set_option(floating_bufnr, 'filetype', filetype)
-  end
-  local float_option = vim.lsp.util.make_floating_popup_options(width, height, opts)
-  float_option.focusable = false
-  local floating_winnr = api.nvim_open_win(floating_bufnr, false, float_option)
-  if filetype == 'markdown' then
-    api.nvim_win_set_option(floating_winnr, 'conceallevel', 2)
-  end
-  api.nvim_buf_set_lines(floating_bufnr, 0, -1, true, contents)
-  api.nvim_buf_set_option(floating_bufnr, 'modifiable', false)
-  api.nvim_command("autocmd CursorMovedI,BufHidden,TextChangedI,InsertLeave <buffer> ++once \
-    lua pcall(vim.api.nvim_win_close, "..floating_winnr..", true)")
-  return floating_bufnr, floating_winnr
-end
-
-local focusable_preview = function(unique_name, fn)
-  return focusable_float(unique_name, function()
-    return M.open_floating_preview(fn())
-  end)
-end
-
-local signature_help_to_preview_contents = function(input)
-  if not input.signatures then
-    return
-  end
-  local contents = {}
-  local active_signature = input.activeSignature or 0
-  if active_signature >= #input.signatures then
-    active_signature = 0
-  end
-  local signature = input.signatures[active_signature + 1]
-  if not signature then
-    return
-  end
-  vim.list_extend(contents, vim.split(signature.label, '\n', true))
-  if signature.documentation then
-    vim.lsp.util.convert_input_to_markdown_lines(signature.documentation, contents)
-  end
-  if input.parameters then
-    local active_parameter = input.activeParameter or 0
-    if active_parameter >= #input.parameters then
-      active_parameter = 0
-    end
-    local parameter = signature.parameters and signature.parameters[active_parameter]
-    if parameter then
-      if parameter.documentation then
-        vim.lsp.util.convert_input_to_markdown_lines(parameter.documentation, contents)
-      end
-    end
-  end
-  return contents
-end
-
 M.autoOpenSignatureHelp = function()
   local bufnr = api.nvim_get_current_buf()
   local pos = api.nvim_win_get_cursor(0)
@@ -144,21 +27,7 @@ M.autoOpenSignatureHelp = function()
   end
 
   if triggered then
-    local params = vim.lsp.util.make_position_params()
-    vim.lsp.buf_request(bufnr, 'textDocument/signatureHelp', params, function(_, method, result)
-      if not (result and result.signatures and result.signatures[1]) then
-        return
-      else
-        focusable_preview(method, function()
-          local lines = signature_help_to_preview_contents(result)
-          lines = vim.lsp.util.trim_empty_lines(lines)
-          if vim.tbl_isempty(lines) then
-            return { 'No signature available' }
-          end
-          return lines, vim.lsp.util.try_trim_markdown_code_blocks(lines)
-        end)
-      end
-    end)
+    vim.lsp.buf.signature_help()
   end
 end