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extern crate argparse;
use std::io;
use std::io::{BufRead, BufReader, Error, ErrorKind};
use std::fs::File;
use std::process::exit;
use argparse::{ArgumentParser, StoreTrue, Store};
mod day1;
fn day_switch<T: BufRead>(day: i32, reader: T) -> io::Result<()> {
match day {
1 => day1::main(reader),
_ => Err(Error::new(ErrorKind::Other, "Invalid day"))
}
}
struct Options {
use_stdin: bool,
}
fn run_day(day: i32, opts: &Options) -> io::Result<()> {
if opts.use_stdin {
let stdin = io::stdin();
day_switch(day, BufReader::new(stdin))
} else {
match File::open(format!("../input/{}.txt", day)) {
Ok(f) => day_switch(day, BufReader::new(f)),
Err(_) => Err(Error::new(ErrorKind::Other, format!("No input file for day {}", day)))
}
}
}
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
};
{
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 day_string)
.add_argument("day", Store, "Day to execute");
parser.parse_args_or_exit();
}
error_handler(||
match day_string.parse::<i32>() {
Ok(day) => run_day(day, &options),
Err(_) => {
for day in 1..1 {
run_day(day, &options)?;
}
Ok(())
}
}
)
}
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