[build2] Running commands in buildfile

[Phuwasate Lutchanont]

Hi,

I would like to ask if there is any good resource or documentation for
learning the internal commands supported by the buildfile language? In
particular, I could not understand the code inside double curly braces
whenever I encountered them in the introduction and manual. I cannot seem
to find any thorough explanation on what is going on in the code anywhere
either.

If possible, I would like to see a comprehensive list of buildfile
functions as well as some explanation of what the double curly braces
syntax does.

Thank you,
Phuwasate Lutchanont
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