Sets
Set operations over files where each line is an element.
pip3 install -U sets-operation-over-files
$ sets 'set_a | set_b' -s
a
b
c
d
e
f
g
h
i
j
Usage
An expression supports | (union), & (intersection), - (difference),
^ (symmetric difference), and/or, and parentheses:
$ sets 'set_a & set_b'
File names can be quoted to allow spaces and special characters:
sets "'my list.txt' | other". Output keeps the left operand's line order;
-s sorts it.
How it works
The expression is parsed into an AST instead of string-replaced. Identifiers
and quoted strings are rewritten to file reads — set_a & set_b
becomes s('set_a') & s('set_b') — then evaluated with only the
s function exposed and builtins disabled.
A whitelist guard rejects any node outside set-expression syntax (Attribute,
Lambda, Subscript, ...), so the expression cannot run arbitrary code.
Files are read into an order-preserving set (OrderedSet), so results keep
the left operand's line order across runs.
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