feat: command to automatically generate a file for the new day

Cargo.lock

@@ -23,6 +23,7 @@ version = "0.1.0"
 dependencies = [
  "aoc_proc",
  "color-eyre",
+ "time",
  "ureq",
 ]
 
@@ -314,6 +315,12 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.148"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e53f64bb4ba0191d6d0676e1b141ca55047d83b74f5607e6d8eb88126c52c2dc"
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.4"
@@ -349,6 +356,22 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a561bf4617eebd33bca6434b988f39ed798e527f51a1e797d0ee4f61c0a38376"
+dependencies = [
+ "serde",
+ "time-core",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e153e1f1acaef8acc537e68b44906d2db6436e2b35ac2c6b42640fff91f00fd"
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"

Cargo.toml

@@ -12,3 +12,4 @@ members = ["aoc_proc"]
 color-eyre = "0.6.2"
 aoc_proc = { path = "aoc_proc" }
 ureq = "2.5.0"
+time = "0.3.17"

src/bin/create_day.rs

@@ -0,0 +1,57 @@
+use std::path::Path;
+
+use color_eyre::{Result, eyre::bail};
+
+const TEMPLATE: &str = r#"
+use aoc_2022::prelude::*;
+
+type Input = ();
+
+fn parse(s: &str) -> Result<Input> {
+    Ok(())
+}
+
+#[aoc(day = {{ day }}, parse = parse)]
+fn day_{{ day }}(mut input: Input) -> Result<()> {
+    // Part 1
+    println!("Part one: ");
+
+    // Part 2
+    println!("Part two: ");
+
+    Ok(())
+}
+"#;
+
+fn main() -> Result<()> {
+    let day = std::env::args().nth(1);
+
+    let day = match day {
+        Some(day) => day.parse::<u8>()?,
+        None => {
+            let today = time::OffsetDateTime::now_utc().date();
+
+            if today.month() != time::Month::December {
+                bail!("Its not December yet!");
+            }
+
+            if today.day() > 25 {
+                bail!("Its after Christmas now :/");
+            }
+            
+            today.day()
+        }
+    };
+
+    let output_path = Path::new("src").join("bin").join(format!("day_{day}.rs"));
+
+    if output_path.exists() {
+        bail!("today already exists!");
+    }
+
+    std::fs::write(output_path, TEMPLATE.replace("{{ day }}", &format!("{day}")))?;
+
+    println!("ready uwu :)");
+
+    Ok(())
+}