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Used stdlib signature_help function #189

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haorenW1025 merged 1 commit into from
Sep 3, 2020
Merged

Used stdlib signature_help function #189

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133 changes: 1 addition & 132 deletions lua/completion/signature_help.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand All @@ -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

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