.dotfiles/nvim/after/plugin/signature_help.lua

local signature = require("lsp_signature")

signature.setup({
  -- set to true to enable debug logging
  debug = false,

  -- log dir when debug is on
  -- default is  ~/.cache/nvim/lsp_signature.log
  log_path = vim.fn.stdpath("cache") .. "/lsp_signature.log",

  -- show debug line number
  verbose = false,

  -- This is mandatory, otherwise border config won't get registered.
  -- If you want to hook lspsaga or other signature handler, pls set to false
  bind = true,

  -- will show two lines of comment/doc(if there are more than two lines in doc, will be truncated);
  -- set to 0 if you DO NOT want any API comments be shown
  -- This setting only take effect in insert mode, it does not affect signature help in normal
  -- mode, 10 by default
  doc_lines = 0,

  -- max height of signature floating_window
  max_height = 12,

  -- max_width of signature floating_window, line will be wrapped if exceed max_width
  -- the value need >= 40
  max_width = 80,

  -- allow doc/signature text wrap inside floating_window, useful if your lsp return doc/sig is too long
  wrap = true,

  -- show hint in a floating window, set to false for virtual text only mode
  floating_window = true,

  -- try to place the floating above the current line when possible Note:
  -- will set to true when fully tested, set to false will use whichever side has more space
  -- this setting will be helpful if you do not want the PUM and floating win overlap
  floating_window_above_cur_line = true,

  -- adjust float windows x position.
  -- can be either a number or function
  floating_window_off_x = -8,

  -- adjust float windows y position. e.g -2 move window up 2 lines; 2 move down 2 lines
  -- can be either number or function, see examples
  floating_window_off_y = 14,

  -- close floating window after ms when laster parameter is entered
  close_timeout = 4000,

  -- set to true, the floating window will not auto-close until finish all parameters
  fix_pos = false,

  -- virtual hint enable
  hint_enable = true,

  -- Panda for parameter, NOTE: for the terminal not support emoji, might crash
  -- or, provide a table with 3 icons
  -- hint_prefix = {
  --     above = "↙ ",  -- when the hint is on the line above the current line
  --     current = "← ",  -- when the hint is on the same line
  --     below = "↖ "  -- when the hint is on the line below the current line
  -- }
  hint_prefix = "🐼 ",

  hint_scheme = "String",

  -- should the hint be inline(nvim 0.10 only)?  default false
  -- return true | 'inline' to show hint inline, return 'eol' to show hint at end of line, return false to disable
  -- return 'right_align' to display hint right aligned in the current line
  hint_inline = function() return false end,

  -- how your parameter will be highlight
  hi_parameter = "LspSignatureActiveParameter",

  handler_opts = {
    -- double, rounded, single, shadow, none, or a table of borders
    border = "rounded"
  },

  -- sometime show signature on new line or in middle of parameter can be confusing, set it to false for #58
  always_trigger = false,

  -- autoclose signature float win after x sec, disabled if nil.
  auto_close_after = nil,

  -- Array of extra characters that will trigger signature completion, e.g., {"(", ","}
  extra_trigger_chars = {},

  -- by default it will be on top of all floating windows, set to <= 50 send it to bottom
  zindex = 200,

  -- character to pad on left and right of signature can be ' ', or '|'  etc
  padding = '',

  -- disabled by default, allow floating win transparent value 1~100
  transparency = nil,

  -- if you using shadow as border use this set the opacity
  shadow_blend = 36,

  -- if you using shadow as border use this set the color e.g. 'Green' or '#121315'
  shadow_guibg = 'Black',

  -- default timer check interval set to lower value if you want to reduce latency
  timer_interval = 200,

  -- toggle signature on and off in insert mode,  e.g. toggle_key = '<M-x>'
  toggle_key = nil,

  -- true: toggle floating_windows: true|false setting after toggle key pressed
  -- false: floating_windows setup will not change, toggle_key will pop up signature helper, but signature
  -- may not popup when typing depends on floating_window setting
  toggle_key_flip_floatwin_setting = false,

  -- cycle to next signature, e.g. '<M-n>' function overloading
  select_signature_key = nil,

  -- imap, use nvim_set_current_win to move cursor between current win and floating window
  -- e.g. move_cursor_key = '<M-p>',
  -- once moved to floating window, you can use <M-d>, <M-u> to move cursor up and down
  move_cursor_key = nil,

  -- relate to move_cursor_key; the keymaps inside floating window
  -- e.g. keymaps = { 'j', '<C-o>j' } this map j to <C-o>j in floating window
  -- <M-d> and <M-u> are default keymaps to move cursor up and down
  keymaps = {}
})