From 18cab4c9209996aeaa29a88f8ac98e91dcfdede9 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 1 Dec 2022 04:21:57 -0500
Subject: simplify

---
 src/parse.rs | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

(limited to 'src/parse.rs')

diff --git a/src/parse.rs b/src/parse.rs
index 3674a25..3222bf0 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -4,12 +4,41 @@ 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> {
+pub fn lines<R: std::io::Read>(fh: R) -> 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> {
+pub struct Chunk<'a, I: Iterator<Item = String>> {
+    it: &'a mut I,
+}
+
+impl<'a, I: Iterator<Item = String>> Iterator for Chunk<'a, I> {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if let Some(line) = self.it.next() {
+            if line.is_empty() {
+                return None;
+            } else {
+                return Some(line);
+            }
+        }
+        None
+    }
+}
+
+pub fn chunk<I>(it: &mut I) -> Chunk<'_, I>
+where
+    I: Iterator<Item = String>,
+{
+    Chunk { it }
+}
+
+pub fn split<R: std::io::Read>(
+    fh: R,
+    sep: u8,
+) -> impl Iterator<Item = String> {
     let fh = std::io::BufReader::new(fh);
     fh.split(sep)
         .map(|res| String::from_utf8(res.unwrap()).unwrap())
@@ -19,11 +48,11 @@ 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> {
+pub fn bytes<R: std::io::Read>(fh: R) -> impl Iterator<Item = u8> {
     fh.bytes().map(|res| res.unwrap())
 }
 
-pub fn string(fh: File) -> String {
+pub fn string<R: std::io::Read>(fh: R) -> String {
     let bytes: Vec<_> = bytes(fh).collect();
     String::from_utf8(bytes).unwrap()
 }
-- 
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