Solutions in Rust by David Szotten
$ aoc2017 --help
adventofcode
USAGE:
aoc2017 [OPTIONS] <input> -d <day>
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-d <day>
-p <part> [default: 1] [values: 1, 2]
ARGS:
<input> Sets the input file to use, or `-` for stdin