diff --git a/2021/Cargo.toml b/2021/Cargo.toml
new file mode 100644
index 0000000..1886a99
--- /dev/null
+++ b/2021/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "aoc2021"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+itertools = "0.10"
+paste = "1.0"
diff --git a/2021/rustfmt.toml b/2021/rustfmt.toml
new file mode 100644
index 0000000..a1252c1
--- /dev/null
+++ b/2021/rustfmt.toml
@@ -0,0 +1,7 @@
+newline_style = "Unix"
+max_width = 140
+imports_layout = "Horizontal"
+merge_imports = true
+struct_field_align_threshold = 25
+where_single_line = true
+edition = "2021"
diff --git a/2021/setup_day.sh b/2021/setup_day.sh
new file mode 100755
index 0000000..aca6033
--- /dev/null
+++ b/2021/setup_day.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+
+today=$(date +%d)
+# this assumes that your puzzle input is already in your clipboard
+if [ -n "$WAYLAND_DISPLAY" ]; then
+  wl-paste > inputs/day$today
+else
+  xsel -b > inputs/day$today
+fi
+# add trailing newline if necessary
+sed -i -e '$a\' inputs/day$today
+
+echo '#![feature(test)]
+extern crate test;
+use aoc2020::common::*;
+
+type Parsed = Vec<usize>;
+
+fn read_input() -> String {
+    read_file('$today')
+}
+
+
+fn parse_input(raw: &str) -> Parsed {
+    unimplemented!()
+}
+
+fn part1(parsed: &Parsed) -> usize {
+    unimplemented!()
+}
+
+fn part2(parsed: &Parsed) -> usize {
+    unimplemented!()
+}
+
+fn main() {
+    let input = parse_input(&read_input());
+    println!("Part 1: {}", part1(&input));
+    println!("Part 2: {}", part2(&input));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use aoc2020::*;
+    use paste::paste;
+    use test::black_box;
+
+    const TEST_INPUT: &str = "";
+
+    test!(part1() == 0);
+    test!(part2() == 0);
+    bench!(part1() == 0);
+    bench!(part2() == 0);
+    bench_input!(len == 0);
+}' > src/bin/day$today.rs
diff --git a/2021/src/common.rs b/2021/src/common.rs
new file mode 100644
index 0000000..9f77058
--- /dev/null
+++ b/2021/src/common.rs
@@ -0,0 +1,16 @@
+use std::env;
+
+pub fn read_file(day: usize) -> String {
+    std::fs::read_to_string(
+        env::args()
+            .nth(1)
+            .filter(|n| n != "--bench")
+            .unwrap_or_else(|| format!("inputs/day{:0>2}", day)),
+    )
+    .unwrap()
+}
+
+#[inline]
+pub fn parse_nums(l: &str) -> Vec<usize> {
+    l.split(',').filter_map(|n| n.parse().ok()).collect()
+}
diff --git a/2021/src/lib.rs b/2021/src/lib.rs
new file mode 100644
index 0000000..27a56af
--- /dev/null
+++ b/2021/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod common;
+pub mod teststuff;
diff --git a/2021/src/teststuff.rs b/2021/src/teststuff.rs
new file mode 100644
index 0000000..286fddb
--- /dev/null
+++ b/2021/src/teststuff.rs
@@ -0,0 +1,39 @@
+#[macro_export]
+macro_rules! bench {
+    ($part: ident ($($param: expr),*) == $expected:expr) => {
+        use paste::paste;
+        paste! {
+            #[bench]
+            fn [<$part _bench>](b: &mut test::Bencher) {
+                    let raw = &read_input();
+                let input = parse_input(&raw);
+                b.iter(|| assert_eq!($part(black_box(&input)$(, $param)*), $expected));
+            }
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! bench_input {
+    ($fn:ident == $expected_len:expr) => {
+        #[bench]
+        fn bench_input_parsing(b: &mut test::Bencher) {
+            let raw = read_input();
+            b.iter(|| assert_eq!(parse_input(black_box(&raw)).$fn(), $expected_len));
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! test {
+    ($part: ident ($($param: expr),*) == $expected:expr) => {
+        use paste::paste;
+        paste! {
+            #[test]
+            fn [<$part _test>]() {
+                let input = parse_input(TEST_INPUT);
+                assert_eq!($part(&input$(, $param)*), $expected);
+            }
+        }
+    };
+}