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#[macro_use] extern crate lazy_static;
extern crate regex;
extern crate argparse;
use std::io;
use std::io::{BufRead, BufReader, Error, ErrorKind, Read};
use std::fs::File;
use std::process::exit;
use std::time::Instant;
use argparse::{ArgumentParser, StoreTrue, Store};
mod day1;
mod day2;
mod day3;
mod day4;
mod day5;
static NUM_DAYS: i32 = 5;
fn day_switch<T: BufRead>(day: i32, reader: T) -> io::Result<(String, String)> {
match day {
1 => day1::main(reader),
2 => day2::main(reader),
3 => day3::main(reader),
4 => day4::main(reader),
5 => day5::main(reader),
_ => Err(Error::new(ErrorKind::Other, "Invalid day"))
}
}
fn file_for_day(day: i32) -> io::Result<BufReader<File>> {
match File::open(format!("../input/{}.txt", day)) {
Ok(f) => Ok(BufReader::new(f)),
Err(_) => Err(Error::new(ErrorKind::Other, format!("No input file for day {}", day)))
}
}
fn benchmark_day(day: i32) -> io::Result<f64> {
let num_iters = 100;
let mut input = Vec::new();
file_for_day(day)?.read_to_end(&mut input)?;
let start = Instant::now();
for _i in 0..num_iters {
day_switch(day, BufReader::new(&input[..]))?;
}
let end = Instant::now();
let dur = (end - start) / num_iters;
let secs = dur.as_secs() as f64 + dur.subsec_micros() as f64 / 1000000.0;
println!("Day {}: {} secs", day, secs);
Ok(secs)
}
fn benchmark_all_days() -> io::Result<()> {
let mut total = 0.0;
for day in 1..NUM_DAYS + 1 {
total += benchmark_day(day)?;
}
println!("Total: {} secs", total);
Ok(())
}
struct Options {
use_stdin: bool,
bench: bool,
}
fn run_day(day: i32, opts: &Options) -> io::Result<()> {
let (part1, part2) = if opts.bench {
benchmark_day(day)?;
return Ok(())
} else if opts.use_stdin {
day_switch(day, BufReader::new(io::stdin()))?
} else {
day_switch(day, file_for_day(day)?)?
};
println!("{}", part1);
println!("{}", part2);
Ok(())
}
fn run_all_days(opts: &Options) -> io::Result<()> {
if opts.bench {
assert!(!opts.use_stdin);
benchmark_all_days()
} else {
for day in 1..6 {
run_day(day, &opts)?;
}
Ok(())
}
}
fn error_handler<F>(func: F) -> io::Result<()>
where F: Fn() -> io::Result<()> {
match func() {
Ok(()) => Ok(()),
Err(err) => {
if err.kind() == ErrorKind::Other {
println!("Error: {}", err);
exit(1)
} else {
Err(err)
}
}
}
}
fn main() -> io::Result<()> {
let mut day_string = String::new();
let mut options = Options {
use_stdin: false,
bench: false,
};
{
let mut parser = ArgumentParser::new();
parser.set_description("AOC 2018 solutions by Tom Smeding");
parser.refer(&mut options.use_stdin)
.add_option(&["-s", "--stdin"], StoreTrue, "Read from stdin");
parser.refer(&mut options.bench)
.add_option(&["-b", "--bench"], StoreTrue, "Benchmark the given days");
parser.refer(&mut day_string)
.add_argument("day", Store, "Day to execute");
parser.parse_args_or_exit();
}
error_handler(||
if day_string.len() == 0 {
run_all_days(&options)
} else {
match day_string.parse::<i32>() {
Ok(day) => run_day(day, &options),
Err(_) => {
println!("Invalid day argument");
exit(1)
}
}
}
)
}
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