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Originally, the expression lanuage only contained a function to
deduplicate a list, keeping only the right-most occurence. The
reason was that this is the order needed for linking: a library
providing an open symbol has to come on the command line after the
library using that symbol (and hence making it an open symbol).
However, by now use cases have emerged that require a topological
sorting where definition comes before use; also, when composing
the value of PATH from fragments, we usually want to keep the first
occurrence in order for it to take precedence. Therefore, also
add "nub_left" as built-in function, allowing a more condense (and
slightly more efficient) description in rules instead of the
revserse-nub_right-reverse pattern.
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... allowing to select only the keys in a specific subdir,
and move the them to top-level.
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While this can already be expressed by an "if" statement, having
a dedicated function for logical negation makes some expressions
more readable.
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... using, also for the "then" branch, the empty list as default.
In this way, this statement not only more symmetric, but also
allows shorter representations of some typical expressions.
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Lists are somtimes used in configurations as replacement for tuples.
Providing length gives an easy way to detect usage errors.
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Numerical values are used at some places in justbuild: as value for
timeout scaling, as well as by the "range" expression that is used,
e.g., to define repreated test runs. Therefore, improve support
for numerical values by adding basic operations.
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While a foldl is enough to implement a reverse functionality,
adding it as a built in allows doing so in linear time.
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... to obtain from a list of strings a map with those entries
as keys and true as value. In this way, repeated membership tests
in lists can be implemented more efficiently.
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