It's that time of year again, I guess, so here are my solutions to the puzzles! They're written in Rust again because it's been a year and I haven't used it ever since so I've forgotten almost all of it...
I also decided to write a little post for each day. If you're interested, you can read them here.
Here's the help text of the CLI:
Advent of Code 2019 1.0
Simon Berger
USAGE:
aoc_2019 [OPTIONS] [INPUT]
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-d, --day <PART> Set the day (Defaults to the current day)
-p, --part <PART> Which part of the day to solve [default: both] [possible values: first, second, both]
ARGS:
<INPUT> Sets the input file to use [default: STDIN]
By default, it takes the input from the console and solves both parts of "today's" puzzle with it.
If you're reading this in the future the "today" part obviously no longer applies so you will have to provide the day
argument.