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-- @author Peter J. Kranz (Absurd-Mind, peter@myref.net)
-- Any questions, criticism or praise just drop me an email
local awful = { util = require('awful.util') }
local M = {}
-- get the current Pid of awesome
local function getCurrentPid()
-- get awesome pid from pgrep
local fpid = io.popen("pgrep -u " .. os.getenv("USER") .. " -o awesome")
local pid = fpid:read("*n")
fpid:close()
-- sanity check
if pid == nil then
return -1
end
return pid
end
local function getOldPid(filename)
-- open file
local pidFile = io.open(filename)
if pidFile == nil then
return -1
end
-- read number
local pid = pidFile:read("*n")
pidFile:close()
-- sanity check
if pid <= 0 then
return -1
end
return pid;
end
local function writePid(filename, pid)
local pidFile = io.open(filename, "w+")
if pidFile == nil then
print("failed to write pid " .. pid .. " to " .. filename)
else
pidFile:write(pid)
pidFile:close()
end
end
local function shallExecute(oldPid, newPid)
-- simple check if equivalent
if oldPid == newPid then
return false
end
return true
end
local function getPidFile()
local host = awful.util.pread("/proc/sys/kernel/hostname")
if host == nil then
local fhost = io.popen("hostname")
host = fhost:read()
fhost:close()
end
return awful.util.getdir("cache") .. "/awesome." .. host .. ".pid"
end
-- run Once per real awesome start (config reload works)
-- does not cover "pkill awesome && awesome"
function M.run(shellCommand)
-- check and Execute
if shallExecute(M.oldPid, M.currentPid) then
awful.util.spawn_with_shell(shellCommand)
end
end
M.pidFile = getPidFile()
M.oldPid = getOldPid(M.pidFile)
M.currentPid = getCurrentPid()
writePid(M.pidFile, M.currentPid)
return M
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