lualine.nvim/lua/lualine/components/special/function_component.lua

local FunctionComponent = require('lualine.component'):new()

FunctionComponent.update_status = function(self, is_focused)
  -- 1st element in options table is the function provided by config
  local ok, retval
  ok, retval = pcall(self.options[1], self, is_focused)
  if not ok then return '' end
  if type(retval) ~= 'string' then
    ok, retval = pcall(tostring, retval)
    if not ok then return '' end
  end
  return retval
end

return FunctionComponent
Refactor: Components now use OOP style (#141) 2021-04-11 08:20:41 +00:00			`local FunctionComponent = require('lualine.component'):new()`

[Breaking] Refactor: switch to %{%expr%} from %!expr Huge change to internal mechanics. - Now %{%expr%} blocks are used for evaluating statusline instead of %!expr . Pros for this is statusline is evaluated on current win and buf context instead of active win & bufs context. - Now all components branch & diff(These two are cached) including users function components updates on inactive status. - now components update status and function components receive an argument (is_focused) when called. It indicates whether it's running for active or inactive statusline. - Now lualine no longer aggrasively takes over 'statusline' option. instead it sets the global version of statusline option. So it's possible to unset it to hide lualine . Or set buffer local version of that option to have different statusline then lualine on thay buffer - Switch vim.o to vim.go or vim.opt. - BugFix autcommands being set everytime an instence of diff or branch component is created - Added new utils functions define_autocmd & is_focused - Remove utils function lualine_eval - Removed hacky require cache modification from component.lua 2021-08-08 16:03:58 +00:00			`FunctionComponent.update_status = function(self, is_focused)`
BugFix: Fix function component not working (#175) When the provided function takes an optional argument the previous implementation causes error. 2021-04-13 17:09:01 +00:00			`-- 1st element in options table is the function provided by config`
enhance: improve function component - provide self as 1st argument - handle error in function call - convert the result to string by default 2021-09-03 12:19:00 +00:00			`local ok, retval`
			`ok, retval = pcall(self.options[1], self, is_focused)`
			`if not ok then return '' end`
			`if type(retval) ~= 'string' then`
			`ok, retval = pcall(tostring, retval)`
			`if not ok then return '' end`
			`end`
			`return retval`
Refactor: Components now use OOP style (#141) 2021-04-11 08:20:41 +00:00			`end`

			`return FunctionComponent`