如何在Conky中实现基本的Lua功能? [英] How to implement a basic Lua function in Conky?

问题描述

我正在尝试向Conky添加一个函数，该函数打印字符串的长度以用于调试.在名为test.lua的文件中的代码非常简单:

I am trying to add a function to my Conky which prints the length of a string for debug purposes. The code, inside a file called test.lua, is pretty trivial:

function test(word)
return string.len(word)
end

...然后我像这样加载它.在我的conky.config部分中，我有:

...and I load it like this. In my conky.config section I have:

lua_load = '/home/xvlaze/test.lua',
lua_draw_hook_pre = 'test'

...在我的conky.text部分中:

...in the conky.text section I have:

${lua test "fooo"}

...其中，test是函数的名称，而fooo是要测试的字符串.

...where test is the name of the function and fooo the string to test.

预期的结果应该是在Conky中打印4，但是我得到的却不是:

The expected result should be a printed 4 in Conky, but instead of that I get:

conky: llua_do_call: function conky_test execution failed: /home/xvlaze/test.lua:2: attempt to index a nil value (local 'string')
conky: llua_getstring: function conky_test didn't return a string, result discarded

我已经浏览了文档，但找不到任何内容.有人知道失败在哪里吗?

I have browsed through the documentation, but I can't find anything. Does anybody know where the failure is?

推荐答案

关于如何在Conky中实现功能的一些指导:

• 首先:您必须在使用功能名称之前使用conky_. 否则，在运行Conky时会出现以下错误:

• First of all: YOU MUST USE conky_ BEFORE YOUR FUNCTION'S NAME. Otherwise, you will get the following error when running your Conky:

attempt to call a nil value

第二:您必须始终返回一个值. 我不介意重复它-它是关键的.否则，您将获得:

Secondly: YOU MUST ALWAYS RETURN A VALUE. I don't mind repeating it - it is crucial. Otherwise, you will get:

function foobar didn't return a string, result discarded
function_result

... 在您的终端机中，您的Conky将不留任何与您的额外代码相关的值.关于您的功能将不会打印任何内容.

...in your terminal, and your Conky will be left empty of values related to your extra code. Nothing will be printed regarding your function.

最后但并非最不重要的一点:您必须始终致电自己喜欢的功能:

Last but not least: YOU MUST ALWAYS CALL YOUR FUNCTION LIKE:

lua_load = '/path/to/function.lua',
-- Whatever content...
${lua function_name function_parameter1 function_parameterN} -- In case you use more than one parameter.

总而言之，虚拟功能模板可以是:

In summary, a dummy function template could be:

• 主文件(conky.conf):

conky.config = {
    -- Whatever content... Lua styled comments.
    lua_load = '/path/to/function.lua',
}

conky.text = [[
    # Whatever content... In this section comments are started with '#'!    
    ${lua function_name parameter}
]]

功能文件:

function conky_function_name(parameter)
    -- Whatever content... Remember this is Lua, not conky.text syntax. Always use '--' comments!
    return whatever -- No return, no party. A function MUST always return something!
end

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