Script lua for text in uppercase, lowercase and type of sentence (Scritp lua, texto en mayusculas, minusculas y oracion)

[balala]

Script lua to show the text in uppercase, lowercase or sentence format in a string meter in Rainmeter.

Your code is for sure useful in many cases, however sometimes a much easier solution does exist: you can add a StringCase option to the String meters. It has four possible values:

• None - the string isn't altered, it is show as it is.
• Upper - All letters converted uppercase.
• Lower - All letters converted lowercase.
• Proper - The first letter of all words is converted uppercase. Here is a great difference, because using the ora function of your lua script, you get uppercase only the first letter of the whole string, while setting the StringCase to Proper sets uppercase all first letter of all words within the string.

Again, please don't misunderstand me, your code can be and is useful in many cases, I just wanted to show an (at least sometimes) usable alternative.

[balala]

The StringCase modifies all the text that is shown in the meter.

Not necessarily. You can use the Case setting of an Inline to get modified the string only partially.

[balala]

I have to study Inline

Yep, it's an interesting option, added on July 31, 2015 (version 3.3.2423) to the String meters, which indeed worth to be studied a little bit.
However I don't contest the benefits of your code. In many cases it can be useful and don't be disappointed by my reply to your initial message, your code is definitely useful. Just had to add that comment.

[balala]

Of course, if it's not an inconvenience for you.

No, it's never. I'm happy to help whenever I have enough time and energy. Other times you have to wait for a while.