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use crate::prelude::*;
pub fn data(year: u16, day: u16) -> Result<File> {
File::open(format!("data/{}/{}.txt", year, day)).map_err(|e| anyhow!(e))
}
pub fn lines(fh: File) -> impl Iterator<Item = String> {
let fh = std::io::BufReader::new(fh);
fh.lines().map(|res| res.unwrap())
}
pub fn split(fh: File, sep: u8) -> impl Iterator<Item = String> {
let fh = std::io::BufReader::new(fh);
fh.split(sep)
.map(|res| String::from_utf8(res.unwrap()).unwrap())
}
pub fn ints(iter: impl Iterator<Item = String>) -> impl Iterator<Item = i64> {
iter.map(|s| s.trim().parse().unwrap())
}
pub fn bytes(fh: File) -> impl Iterator<Item = u8> {
fh.bytes().map(|res| res.unwrap())
}
pub fn string(fh: File) -> String {
let bytes: Vec<_> = bytes(fh).collect();
String::from_utf8(bytes).unwrap()
}
pub fn bool_grid(
lines: impl Iterator<Item = String>,
t: u8,
f: u8,
) -> Grid<bool> {
lines
.map(|s| {
s.as_bytes()
.iter()
.copied()
.map(|b| {
if b == f {
false
} else if b == t {
true
} else {
panic!("unrecognized character {}", char::from(b))
}
})
.collect::<Vec<_>>()
})
.collect()
}
pub fn digit_grid(lines: impl Iterator<Item = String>) -> Grid<u8> {
lines
.map(|s| {
s.as_bytes()
.iter()
.copied()
.map(|b| b - b'0')
.collect::<Vec<_>>()
})
.collect()
}
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