local json = require "cjson"

local taskwarrior = {}

--- @param str string
--- @return string
local function shellescape(str)
	return "'"..str:gsub([[']], [['"'"']]).."'"
end


--- @alias Task table

--- Imports all tasks from Taskwarrior according to filters if given
--- @param ... string Taskwarrior filters as individual strings
--- @return Task[] tasks Sequence listing all tasks
function taskwarrior.import(...)
	local filters = {...}
	for i, filter in ipairs(filters) do
		filters[i] = shellescape(filter)
	end
	return json.decode(io.popen("task "..table.concat(filters, " ").." export"):read("*a"))
end

--- Export tasks back into taskwarrior using the import command
--- @param items Task[] Sequence of tasks to import
function taskwarrior.export(items)
	local handle = assert(io.popen("task import"))
	handle:write(json.encode(items))
	handle:close()
end

return taskwarrior