library of functions

[manjh]

After a very short period of toying with Blockly, I have been learning and playing with LUA scripts, and found they are very flexible.
But now that the number of scripts is growing, I find that I would like to put some frequently used sequences of LUA lines into a library of functions or macro's, whichever is the better word for it. I would want to be able to call these functions from any LUA script.
Is this possible, and if so: how?

[trixwood]

This pops up...

http://www.domoticz.com/forum/viewtopic ... it=ezvents

[stlaha2007]

For python there's import,
Also LUA has function libraries. Take a look at http://www.lua.org/manual
Section 5.2 talks about how to call them.

Downside is you need to program these in C etcetera.

[simonrg]

You don't need to program in C or use Python, Lua has really clever ways of incorporating common code using modules with a function called require. This can become quite sophisiticated allowing you to have flexible ways of keeping specific functions together, have a look at https://www.tutorialspoint.com/lua/lua_modules.htm.

You can equally make it really simple by just reading in a file using dofile - http://luatut.com/dofile.html

Just put your code in a file and then:

Code: Select all

dofile("/home/pi/domoticz/scripts/lua/mylibraryfile.lua")

If you learn how to use Lua in this way then this will be transferable to any other uses of Lua.

The alterantive is to use a framework, which you will find several mentioned in the forum, but they may be too complicated for what you need and any learning is only relevant to that framework with Domoticz.

[stlaha2007]

You don't need to program in C or use Python, Lua has really clever ways of incorporating common code using modules with a function called require. This can become quite sophisiticated allowing you to have flexible ways of keeping specific functions together, have a look at https://www.tutorialspoint.com/lua/lua_modules.htm.

Wasn't aware of this. As i only read briefly my quoted site.

Used to use libraries in perl/python/bash and couldn't imagion it wasn't available in lua.

[manjh]

You don't need to program in C or use Python, Lua has really clever ways of incorporating common code using modules with a function called require. This can become quite sophisiticated allowing you to have flexible ways of keeping specific functions together, have a look at https://www.tutorialspoint.com/lua/lua_modules.htm.

You can equally make it really simple by just reading in a file using dofile - http://luatut.com/dofile.html

Just put your code in a file and then:

Code: Select all

dofile("\home\pi\domoticz\scripts\lua\mylibraryfile.lua")

If you learn how to use Lua in this way then this will be transferable to any other uses of Lua.

The alterantive is to use a framework, which you will find several mentioned in the forum, but they may be too complicated for what you need and any learning is only relevant to that framework with Domoticz.

I suspect this will not work for me: I use a Windows-10 based server to run Domoticz...

[simonrg]

I suspect this will not work for me: I use a Windows-10 based server to run Domoticz...

Windows shouldn't make any difference, you just need to put the paths into the right format.

As I don't use Windows for Domoticz, I just Googled lua dofile windows (other search engines are available), found things like http://stackoverflow.com/questions/2234 ... in-windows.

So either put the file in the same directory as Domoticz is executing Lua (which could be the directory you put the script_device_something.lua files)

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dofile("mylibraryfile.lua")

Or this may work

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dofile("c:\\users\\pi\\domoticz\\scripts\\lua\\mylibraryfile.lua")

Or according to stackoverflow this may also work

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dofile([[c:\users\pi\domoticz\scripts\lua\mylibraryfile.lua")

Oops I did all the slashes Windows way round in the first email, for Linux it should be:

Code: Select all

dofile("/home/pi/domoticz/scripts/lua/mylibraryfile.lua")