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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
local pth = require('acf.path')
local util = require('acf.persistence.util')
require 'posix'
backend = require('acf.object').class()
-- TODO cache expiration
function backend:init() self.cache = {} end
function backend:get(path, tpe)
local name = pth.join('/', unpack(path))
if not self.cache[name] then
local t = posix.stat(name, 'type')
if not t then return end
if t == 'regular' then
self.cache[name] = util.read_file(name)
elseif t == 'directory' then
local res = {}
for _, fname in ipairs(posix.dir(name)) do
if not ({['.']=true, ['..']=true})[fname] then
table.insert(res, pth.name(fname))
end
end
return res
else error('Unsupported file type: '..name) end
-- TODO present symlinks as references
end
return self.cache[name]
end
function backend:set(mods)
for _, mod in pairs(mods) do
local path, t, value = unpack(mod)
local name = pth.join('/', unpack(path))
-- TODO save references (t == 'reference') as symlinks
if not t then
-- TODO del files & dirs
print('DEL', name)
elseif t == 'table' then
assert(posix.mkdir(name))
else
local file = util.open_file(name, 'w')
file:write(tostring(value))
file:close()
self.cache[name] = value
end
end
end
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