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local api = vim.api
local M = {}
--- Creates a cache table for buffers keyed by a type name.
--- Cache entries attach to the buffer and cleanup entries
--- as buffers are detached.
function M.create_buffer_cache()
local cache = {}
local items = setmetatable({}, {
__index = function(tbl, key)
rawset(tbl, key, {})
return rawget(tbl, key)
end
})
function cache.set(type_name, bufnr, value)
if not cache.has(type_name, bufnr) then
-- Clean up the cache if the buffer is detached
-- to avoid memory leaks
api.nvim_buf_attach(bufnr, false, {
on_detach = function()
cache.remove(type_name, bufnr)
return true
end
})
end
items[type_name][bufnr] = value
end
function cache.get(type_name, bufnr)
return items[type_name][bufnr]
end
function cache.has(type_name, bufnr)
return cache.get(type_name, bufnr) ~= nil
end
function cache.remove(type_name, bufnr)
items[type_name][bufnr] = nil
end
return cache
end
return M
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