#!/usr/bin/env luajit

-- An example users .aataaj_JACK.lua script that just starts qsynth.


-- Most of this APT stuff was copied from apt-panopticon.
local APT = {}

APT.readCmd = function(cmd)
    local result = {}
    local output = io.popen(cmd)
    if nil ~= output then
	for l in output:lines() do
	    table.insert(result, l)
	end
    end
    return result
end


APT.exe = function(c)
    local exe = {status = 0, result = '', lines = {}, log = true, cmd = c .. ' ', command = c}

    function exe:log()
	self.log = true
	return self
    end
    function exe:Nice(c)
	if nil == c then
	    self.cmd = 'ionice -c3 nice -n 19 ' .. self.cmd
	else
	    self.cmd = self.cmd .. 'ionice -c3 nice -n 19 ' .. c .. ' '
	end
	return self
    end
    function exe:timeout(c)
	-- timeout returns a status of - command status if --preserve-status; "128+9" (actually 137) if --kill-after ends up being done; 124 if it had to TERM; command status if all went well.
	-- --kill-after means "send KILL after TERM fails.
	if nil == c then
	    self.cmd = 'timeout --kill-after=10.0 --foreground 42.0s ' .. self.cmd
	else
	    self.cmd = 'timeout --kill-after=10.0 --foreground ' .. c .. ' ' .. self.cmd
	end
	return self
    end
    function exe:also(c)
	if nil == c then c = '' else c = ' ' .. c end
	self.cmd = self.cmd .. ';' .. c .. ' '
	return self
    end
    function exe:And(c)
	if nil == c then c = '' else c = ' ' .. c end
	self.cmd = self.cmd .. '&&' .. c .. ' '
	return self
    end
    function exe:Or(c)
	if nil == c then c = '' end
	self.cmd = self.cmd .. '|| ' .. c .. ' '
	return self
    end
    function exe:noErr()
	self.cmd = self.cmd .. '2>/dev/null '
	return self
    end
    function exe:wait(w)
	self.cmd = self.cmd .. '&& touch ' .. w .. ' '
	return self
    end
    function exe:Do()
    --[[    "The condition expression of a control structure can return any
	    value. Both false and nil are considered false. All values different
	    from nil and false are considered true (in particular, the number 0
	    and the empty string are also true)."
	says the docs, I beg to differ.]]
	if true == self.log then D("  executing - &nbsp; <code>" .. self.cmd .. "</code>") end
	--[[ Damn os.execute()
	    Lua 5.1 says it returns "a status code, which is system-dependent"
	    Lua 5.2 says it returns true/nil, "exit"/"signal", the status code.
	    I'm getting 7168 or 0.  No idea what the fuck that is.
	local ok, rslt, status = os.execute(s)
	]]
	local f = APT.readCmd(self.cmd, 'r')
	-- The last line will be the command's returned status, collect everything else in result.
	self.status = ''	-- Otherwise the result starts with 0.
	self.result = '\n'
	self.lines = f
	for i,l in ipairs(f) do
	    self.result = self.result .. l .. "\n"
	end
	f = APT.readCmd('echo "$?"', 'r')
	for i,l in ipairs(f) do
	    self.status = tonumber(l)
	    if (137 == self.status) or (124 == self.status) then
		print("timeout killed " .. self.status .. ' ' .. self.command)
		E("timeout killed " .. self.status .. ' ' .. self.command)
	    elseif (0 ~= self.status) then
		print("status |" .. self.status .. '| ' .. self.command)
		E("status |" .. self.status .. '| ' .. self.command)
	    end
	end
	return self
    end
    function exe:fork(host)
	if nil ~= host then self.cmd = self.cmd .. ';  r=$?; if [ $r -ge 124 ]; then echo "$r ' .. host .. ' failed forked command ' .. string.gsub(self.cmd, '"', "'") .. '"; fi' end
	self.cmd = '{ ' .. self.cmd .. '; } &'
	if true == self.log then D("  forking - &nbsp; <code>" .. self.cmd .. "</code>") end
	os.execute(self.cmd)
	return self
    end
    return exe
end

APT.exists = function(c)
    if 0 == APT.exe('which ' .. c):Do().status then return true end
    return false
end

APT.killEmAll = function(all)
    for i,l in ipairs(all) do
	local c = 0
	while 0 ~= tonumber(APT.exe("pgrep -u $USER -xc " .. l):Do().result) do
	    local s = 'TERM'
	    if c > 0 then s = 'KILL'; APT.exe("sleep " .. c):Do() end
	    print(  "pkill -" .. s .. " -u $USER -x " .. l)
	    APT.exe("pkill -" .. s .. " -u $USER -x " .. l):Do()
	    c = c + 1
	end
    end
end


if APT.exists('qsynth') then APT.exe('qsynth'):fork() end