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luaversionlua-4.0

How to check for the version number?

I've written a small program in Lua 4. In the output it produces I have the program version number stored as a string as follows:

AppVersion = "1.6.2"

How do I parse this string to check whether the recorded version number is equal to or less than the current program version number?

Solution

  • You can use this code:

    AppVersion = "1.6.2"
recordedVersion = "1.7.2"

_, _, v1, v2, v3 = strfind( AppVersion, "(%d+)%.(%d+)%.(%d+)" )
_, _, r1, r2, r3 = strfind( recordedVersion, "(%d+)%.(%d+)%.(%d+)" )

    (The relevant section of the manual is here).

    Then you can convert the three components of each version to numbers and compare them.