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local api = vim.api
local M = {}
local function get_ftplugin_runtime(filetype)
local files = api.nvim__get_runtime({
string.format('ftplugin/%s.vim', filetype),
string.format('ftplugin/%s_*.vim', filetype),
string.format('ftplugin/%s/*.vim', filetype),
string.format('ftplugin/%s.lua', filetype),
string.format('ftplugin/%s_*.lua', filetype),
string.format('ftplugin/%s/*.lua', filetype),
}, true, {}) --[[@as string[] ]]
local r = {} ---@type string[]
for _, f in ipairs(files) do
-- VIMRUNTIME should be static so shouldn't need to worry about it changing
if not vim.startswith(f, vim.env.VIMRUNTIME) then
r[#r + 1] = f
end
end
return r
end
-- Keep track of ftplugin files
local ftplugin_cache = {} ---@type table<string,table<string,integer>>
-- Keep track of total number of FileType autocmds
local ft_autocmd_num ---@type integer?
-- Keep track of filetype options
local ft_option_cache = {} ---@type table<string,table<string,any>>
--- @param path string
--- @return integer
local function hash(path)
local mtime0 = vim.uv.fs_stat(path).mtime
return mtime0.sec * 1000000000 + mtime0.nsec
end
--- Only update the cache on changes to the number of FileType autocmds
--- and changes to any ftplugin/ file. This isn't guaranteed to catch everything
--- but should be good enough.
--- @param filetype string
local function update_ft_option_cache(filetype)
local new_ftautos = #api.nvim_get_autocmds({ event = 'FileType' })
if new_ftautos ~= ft_autocmd_num then
-- invalidate
ft_option_cache[filetype] = nil
ft_autocmd_num = new_ftautos
end
local files = get_ftplugin_runtime(filetype)
ftplugin_cache[filetype] = ftplugin_cache[filetype] or {}
if #files ~= #vim.tbl_keys(ftplugin_cache[filetype]) then
-- invalidate
ft_option_cache[filetype] = nil
ftplugin_cache[filetype] = {}
end
for _, f in ipairs(files) do
local mtime = hash(f)
if ftplugin_cache[filetype][f] ~= mtime then
-- invalidate
ft_option_cache[filetype] = nil
ftplugin_cache[filetype][f] = mtime
end
end
end
--- @private
--- @param filetype string Filetype
--- @param option string Option name
--- @return string|integer|boolean
function M.get_option(filetype, option)
update_ft_option_cache(filetype)
if not ft_option_cache[filetype] or not ft_option_cache[filetype][option] then
ft_option_cache[filetype] = ft_option_cache[filetype] or {}
ft_option_cache[filetype][option] = api.nvim_get_option_value(option, { filetype = filetype })
end
return ft_option_cache[filetype][option]
end
return M
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