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|
local fw = require 'bee.filewatch'
local fs = require 'bee.filesystem'
local await = require 'await'
local MODIFY = 1 << 0
local RENAME = 1 << 1
local function isExists(filename)
local path = fs.path(filename)
local suc, exists = pcall(fs.exists, path)
if not suc or not exists then
return false
end
local suc, res = pcall(fs.canonical, path)
if not suc or res:string() ~= path:string() then
return false
end
return true
end
---@class filewatch
local m = {}
m._eventList = {}
m._watchings = {}
function m.watch(path)
if m._watchings[path] then
m._watchings[path].count = m._watchings[path].count + 1
else
m._watchings[path] = {
count = 1,
id = fw.add(path),
}
log.debug('fw.add', path)
end
local removed
return function ()
if removed then
return
end
removed = true
m._watchings[path].count = m._watchings[path].count - 1
if m._watchings[path].count == 0 then
fw.remove(m._watchings[path].id)
m._watchings[path] = nil
log.debug('fw.remove', path)
end
end
end
---@param callback async fun()
function m.event(callback)
m._eventList[#m._eventList+1] = callback
end
function m._callEvent(ev, path)
for _, callback in ipairs(m._eventList) do
await.call(function ()
callback(ev, path)
end)
end
end
function m.update()
local collect
for _ = 1, 10000 do
local ev, path = fw.select()
if not ev then
break
end
log.debug('filewatch:', ev, path)
if not collect then
collect = {}
end
if ev == 'modify' then
collect[path] = (collect[path] or 0) | MODIFY
elseif ev == 'rename' then
collect[path] = (collect[path] or 0) | RENAME
end
end
if not collect or not next(collect) then
return
end
for path, flag in pairs(collect) do
if flag & RENAME ~= 0 then
if isExists(path) then
m._callEvent('create', path)
else
m._callEvent('delete', path)
end
elseif flag & MODIFY ~= 0 then
m._callEvent('change', path)
end
end
end
return m
|
