From a2abe26e3190ee2105bf1d46066ae48d3c2ad4f0 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 2 Dec 2020 00:33:09 -0500
Subject: puzzle 2-1

---
 Cargo.lock        |   43 +++
 Cargo.toml        |    1 +
 data/2.txt        | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/2020/2/mod.rs |   64 ++++
 src/2020/mod.rs   |    4 +
 5 files changed, 1112 insertions(+)
 create mode 100644 data/2.txt
 create mode 100644 src/2020/2/mod.rs

diff --git a/Cargo.lock b/Cargo.lock
index c55b2a0..4fb9879 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,9 +6,19 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "paw",
+ "regex",
  "structopt",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
@@ -87,6 +97,12 @@ version = "0.2.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
 
+[[package]]
+name = "memchr"
+version = "2.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+
 [[package]]
 name = "paw"
 version = "1.0.0"
@@ -156,6 +172,24 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cf2c13ed4745de91a5eb834e11c00bcc3709e773173b2ce4c56c9fbde04b9c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+ "thread_local",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b181ba2dcf07aaccad5448e8ead58db5b742cf85dfe035e2227f137a539a189"
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -218,6 +252,15 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "thread_local"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.7.1"
diff --git a/Cargo.toml b/Cargo.toml
index ad1246e..e0ffda6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,4 +9,5 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0"
 paw = "1.0"
+regex = "1.4"
 structopt = { version = "0.3", features = ["paw", "wrap_help"] }
diff --git a/data/2.txt b/data/2.txt
new file mode 100644
index 0000000..45e8c19
--- /dev/null
+++ b/data/2.txt
@@ -0,0 +1,1000 @@
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+5-13 c: cccwbcccccccncfc
+13-17 r: rrrrrrrrrrdrrrcrldn
+2-15 b: nbnknkblbdbbhxxn
+17-19 n: jwmjbxxvcrqlwpsknnz
+5-16 x: xxxxxxxxxxjxxxxnx
+1-7 m: mmmmmmvm
+4-5 r: rrrrv
+6-7 c: xkdzcscg
diff --git a/src/2020/2/mod.rs b/src/2020/2/mod.rs
new file mode 100644
index 0000000..88d3f5b
--- /dev/null
+++ b/src/2020/2/mod.rs
@@ -0,0 +1,64 @@
+use anyhow::Context as _;
+use std::io::BufRead as _;
+
+struct Line {
+    c: char,
+    min_times: usize,
+    max_times: usize,
+    password: String,
+}
+
+impl Line {
+    fn parse(line: &str) -> anyhow::Result<Self> {
+        let rx = regex::Regex::new(r"^([0-9]+)-([0-9]+) (.): (.*)$").unwrap();
+        let captures =
+            rx.captures(line).context("line failed to match regex")?;
+        let c = captures
+            .get(3)
+            .unwrap()
+            .as_str()
+            .parse()
+            .context("invalid policy char")?;
+        let min_times = captures
+            .get(1)
+            .unwrap()
+            .as_str()
+            .parse()
+            .context("invalid policy lower bound")?;
+        let max_times = captures
+            .get(2)
+            .unwrap()
+            .as_str()
+            .parse()
+            .context("invalid policy upper bound")?;
+        let password = captures.get(4).unwrap().as_str().to_string();
+        Ok(Self {
+            c,
+            min_times,
+            max_times,
+            password,
+        })
+    }
+
+    fn valid(&self) -> bool {
+        let count = self.password.chars().filter(|c| *c == self.c).count();
+        count >= self.min_times && count <= self.max_times
+    }
+}
+
+pub fn part1() -> anyhow::Result<()> {
+    let f = std::fs::File::open("data/2.txt")
+        .context("couldn't find data file 2.txt")?;
+    let f = std::io::BufReader::new(f);
+    let lines = f
+        .lines()
+        .map(|l| Line::parse(&l.context("failed to read a line")?))
+        .collect::<anyhow::Result<Vec<Line>>>()?;
+    let count = lines.iter().filter(|l| l.valid()).count();
+    println!("{}", count);
+    Ok(())
+}
+
+pub fn part2() -> anyhow::Result<()> {
+    todo!()
+}
diff --git a/src/2020/mod.rs b/src/2020/mod.rs
index 3800c30..87ceb55 100644
--- a/src/2020/mod.rs
+++ b/src/2020/mod.rs
@@ -1,10 +1,14 @@
 #[path = "1/mod.rs"]
 mod day1;
+#[path = "2/mod.rs"]
+mod day2;
 
 pub fn run(day: u8, puzzle: u8) -> anyhow::Result<()> {
     match (day, puzzle) {
         (1, 1) => day1::part1(),
         (1, 2) => day1::part2(),
+        (2, 1) => day2::part1(),
+        (2, 2) => day2::part2(),
         _ => Err(anyhow::anyhow!("unknown puzzle {}-{}", day, puzzle)),
     }
 }
-- 
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