Passing Argument/s to Lua Script

[Lorccan]

I have found that if I add a bash script to a switch I can pass argument/s when it's triggered: script:///<path>/script.sh arg

However, if I try the same pattern with a Lua script it doesn't seem to work. So my question is: should it be possible to pass an argument to a Lua script?

(I know how to handle the incoming arguments in bash and Lua, so I don't think that that's the issue, but I'll give up trying if it can't be done!)

[Scones]

I'm just bouncing this question as I want the same answer.

What I'm looking for is a more efficient way of triggering LUA scripts rather than a script_device_<whatever>.lua

It seems inefficient running every device script script every time any device state changes.

Is there a way to add a LUA to the 'On Script' and 'Off Script' so that it does the same but more efficiently?

[jannl]

You could create a container devicescript which calls the individual devices script.
In this case you only need commandArray in the container script, which really speeds up the handling.

Why would you want to pass an argument to a LUA script?

[Lorccan]

I am the OP. My reason for wanting to pass an argument is, for example, to change a TV channel. I would have one script, but pass the channel as the argument. That's exactly what I can do with a bash script (in Domoticz) and Lua can take arguments usually (outside Domoticz), so I don't understand why it seems restricted here.

[Nautilus]

I am the OP. My reason for wanting to pass an argument is, for example, to change a TV channel. I would have one script, but pass the channel as the argument. That's exactly what I can do with a bash script (in Domoticz) and Lua can take arguments usually (outside Domoticz), so I don't understand why it seems restricted here.

Have not tested but cannot see any reason it wouldn't accept. Trust you have added something like this to your script:

Code: Select all

local params = {...}
params[1] -- first parameter, if any.
params[2] -- second parameter, if any.
#params   -- number of parameters.

(not sure if it is exactly like this, first google result of "pass parameters to lua script" -> http://stackoverflow.com/questions/9778 ... he-lua-cli).

Also, I suggest looking into the Lua manual for stand alone usage, http://www.lua.org/manual/5.1/manual.html#6. Note the following:

..Lua has been designed as an extension language, to be embedded in a host C program..

What people often seem to forget is that the resources of the embedded program are not available in this kind of usage, like in this case the devicechanged, otherdevices etc.tables and passing commands directly to switches via commandArray. So I don't see any real benefit in using Lua in the on/off action scripts. Only in the event system when the resources of the host program are available.

[jannl]

Lua scripts are alled in a different way in Domoticz, so it is not possible to pass arguments.

How do you determine to which channel to change and pass this value to another script?

[Lorccan]

OK. That answers the question: it is not possible to pass arguments to a Lua script in Domoticz.

I'll continue to use the bash script.

Thanks for your replies.

[Siewert308SW]

viewtopic.php?f=28&t=15973&p=118748#p118748

[Westcott]

As noted by Siewert308SW, all non-local variables in the calling script are available in the called script.