127 lines
4.0 KiB
Lua
127 lines
4.0 KiB
Lua
local M = {}
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-- keeps backup of options that we cahge so we can restore it.
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-- format:
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-- options {
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-- global = <1> {
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-- name = {prev, set}
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-- },
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-- buffer = {
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-- buf1 = <1>,
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-- buf2 = <1>
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-- },
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-- window = {
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-- win1 = <1>,
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-- win2 = <1>
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-- }
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-- }
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---@class LualineNvimOptCacheOptStore
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---@field prev any
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---@field set any
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---@alias LualineNvimOptCacheOpt table<string, LualineNvimOptCacheOptStore>
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---@class LualineNvimOptCache
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---@field global LualineNvimOptCacheOpt[]
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---@field buffer table<number, LualineNvimOptCacheOpt[]>
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---@field window table<number, LualineNvimOptCacheOpt[]>
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---@type LualineNvimOptCache
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local options = {global={}, buffer={}, window={}}
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-- helper function for M.set
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local function set_opt(name, val, getter_fn, setter_fn, cache_tbl)
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-- before nvim 0.7 nvim_win_get_option... didn't return default value when
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-- the option wasn't set instead threw error.
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-- So we need pcall (probably just for test)
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local ok, cur = pcall(getter_fn, name)
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if not ok then cur = nil end
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if cur == val then return end
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if cache_tbl[name] == nil then cache_tbl[name] = {} end
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if cache_tbl[name].set ~= cur then
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cache_tbl[name].prev = cur
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end
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cache_tbl[name].set = val
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setter_fn(name, val)
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end
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-- set a option value
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---@param name string
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---@param val any
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---@param opts table|nil when table can be {global=true | buffer = bufnr | window = winnr}
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--- when nil it's treated as {global = true}
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function M.set(name, val, opts)
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if opts == nil or opts.global then
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set_opt(name, val, vim.api.nvim_get_option, vim.api.nvim_set_option, options.global)
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elseif opts.buffer then
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if options.buffer[opts.buffer] == nil then
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options.buffer[opts.buffer] = {}
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end
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set_opt(name, val, function (nm)
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return vim.api.nvim_buf_get_option(opts.buffer, nm)
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end, function (nm, vl)
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vim.api.nvim_buf_set_option(opts.buffer, nm, vl)
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end, options.buffer[opts.buffer])
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elseif opts.window then
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if options.window[opts.window] == nil then
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options.window[opts.window] = {}
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end
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set_opt(name, val, function (nm)
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return vim.api.nvim_win_get_option(opts.window, nm)
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end, function (nm, vl)
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vim.api.nvim_win_set_option(opts.window, nm, vl)
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end, options.window[opts.window])
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end
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end
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-- resoters old value of option name
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---@param name string
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---@param opts table|nil same as M.set
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function M.restore(name, opts)
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if opts == nil or opts.global then
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if options.global[name] ~= nil and options.global[name].prev ~= nil then
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vim.api.nvim_set_option(name, options.global[name].prev)
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end
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elseif opts.buffer then
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if options.buffer[opts.buffer] ~= nil
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and options.buffer[opts.buffer][name] ~= nil
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and options.buffer[opts.buffer][name].prev ~= nil then
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vim.api.nvim_buf_set_option(opts.buffer, name, options.buffer[opts.buffer][name].prev)
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end
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elseif opts.window then
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if options.window[opts.window] ~= nil
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and options.window[opts.window][name] ~= nil
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and options.window[opts.window][name].prev ~= nil then
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vim.api.nvim_win_set_option(opts.window, name, options.window[opts.window][name].prev)
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end
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end
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end
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-- returns cache for the option name
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---@param name string
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---@param opts table|nil same as M.set
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function M.get_cache(name, opts)
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if opts == nil or opts.global then
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if options.global[name] ~= nil and options.global[name].prev ~= nil then
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return options.global[name].prev
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end
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elseif opts.buffer then
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if options.buffer[opts.buffer] ~= nil
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and options.buffer[opts.buffer][name] ~= nil
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and options.buffer[opts.buffer][name].prev ~= nil then
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return options.buffer[opts.buffer][name].prev
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end
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elseif opts.window then
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if options.window[opts.window] ~= nil
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and options.window[opts.window][name] ~= nil
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and options.window[opts.window][name].prev ~= nil then
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return options.window[opts.window][name].prev
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end
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end
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end
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-- resets cache for options
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function M.reset_cache()
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options = {global={}, buffer={}, window={}}
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end
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return M
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