lualine.nvim/lua/lualine/components/special/vim_var_component.lua

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local VarComponent = require('lualine.component'):new()
VarComponent.update_status = function(self)
local component = self.options[1]
-- vim veriable component
-- accepts g:, v:, t:, w:, b:, o, go:, vo:, to:, wo:, bo:
-- filters g portion from g:var
local scope = component:match('[gvtwb]?o?')
-- filters var portion from g:var
local var_name = component:sub(#scope + 2, #component)
-- Displays nothing when veriable aren't present
local return_val = vim[scope][var_name]
if return_val == nil then return '' end
local ok
ok, return_val = pcall(tostring, return_val)
if ok then return return_val end
return ''
end
return VarComponent