feat: allow do download input

.env.example

@@ -0,0 +1 @@
+SESSION_COOKIE_ENV_VAR=

.gitignore

@@ -3,4 +3,5 @@
 .idea
 /resources/*/inputs/*.in
 /resources/*/outputs/*.out
-Cargo.lock
+Cargo.lock
+.env

Cargo.toml

@@ -6,6 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+aoc-client = "0.2.0"
 clap = { version = "4.5.21", features = ["derive"]}
+dotenv = "0.15.0"
 regex = "1.11.1"
 itertools = "0.13.0"

src/main.rs

@@ -3,9 +3,12 @@ use crate::utils::year::Year;
 use clap::{Parser, Subcommand};
 use std::fmt::{Display, Formatter};
 use std::time::{Duration, Instant};
+use aoc_client::{AocClient};
+use dotenv::dotenv;
 use utils::day_number::DayNumber;
 use utils::file_system::{read_input, read_output};
 use utils::year::Year::Year2023;
+use crate::utils::file_system::write_input;
 
 mod solutions;
 mod utils;
@@ -24,8 +27,12 @@ struct Args {
 
 #[derive(Subcommand, Debug)]
 enum Command {
+    /// Run solver for given puzzle
     #[clap(short_flag = 's')]
     Solve,
+    /// Downloads and saves input for given puzzle
+    #[clap(short_flag = 'i')]
+    Input,
 }
 
 fn parse_day(s: &str) -> Result<u8, String> {
@@ -37,6 +44,8 @@ fn parse_day(s: &str) -> Result<u8, String> {
 }
 
 fn main() {
+    dotenv().ok();
+
     let cli = Args::parse();
     let command = cli.command.unwrap_or(Command::Solve);
     let day = cli.day.unwrap_or(1);
@@ -48,20 +57,26 @@ fn main() {
 
     match command {
         Command::Solve => solve(&day_number, year),
+        Command::Input => download_input(day_number, year),
     }
 }
 
 fn solve(day_number: &DayNumber, year: Year) {
     let solution = solution(&day_number, year.clone());
 
-    let input = read_input(day_number.to_string().as_str(), year.clone());
+    let input = match read_input(day_number.to_string().as_str(), year.clone()) {
+        Ok(val) => val,
+        Err(_) => panic!("Failed to read input. Download it first."), // todo better handle errors
+    };
+
     let output = read_output(day_number.to_string().as_str(), year);
 
     let expected: Vec<String> = output
         .unwrap_or(String::from(""))
         .lines()
         .map(|s| s.to_string())
         .collect();
+
     let expected_part_one = expected.first();
     let expected_part_two = expected.get(1);
 
@@ -75,6 +90,30 @@ fn solve(day_number: &DayNumber, year: Year) {
     );
 }
 
+fn download_input(day_number: DayNumber, year: Year) {
+    let input = read_input(day_number.to_string().as_str(), year.clone());
+
+    match input {
+        Ok(_) => println!("Input already exists."),
+        Err(_) => {
+            println!("Downloading...");
+            let session = std::env::var("SESSION_COOKIE_ENV_VAR").unwrap();
+
+            let client = AocClient::builder()
+                .session_cookie(session).unwrap()
+                .year(year.clone() as i32).unwrap()
+                .day(u32::from(day_number)).unwrap()
+                .build().unwrap();
+
+            let input = client.get_input().unwrap();
+
+            write_input(&day_number.to_string(), year.clone(), &input).unwrap();
+
+            println!("Input downloaded");
+        }
+    }
+}
+
 fn run<'a>(
     part: &str,
     solve_fn: &'a dyn Fn() -> String,

src/utils/day_number.rs

@@ -37,6 +37,12 @@ impl From<DayNumber> for u8 {
     }
 }
 
+impl From<DayNumber> for u32 {
+    fn from(day: DayNumber) -> Self {
+        day.number as u32
+    }
+}
+
 impl Display for DayNumber {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         write!(f, "{:0>2}", self.number)

src/utils/file_system.rs

@@ -1,5 +1,6 @@
 use crate::utils::year::Year;
 use std::fmt::{Display, Formatter};
+use std::fs;
 use std::fs::read_to_string;
 
 enum ResourceType {
@@ -22,8 +23,14 @@ impl Display for ResourceType {
     }
 }
 
-pub fn read_input(day: &str, year: Year) -> String {
-    read(ResourceType::Inputs, day, year).unwrap()
+pub fn write_input(day: &str, year: Year, data: &str) -> std::io::Result<()> {
+    let file_path = build_path(ResourceType::Inputs, day, year);
+
+    fs::write(file_path, data)
+}
+
+pub fn read_input(day: &str, year: Year) -> std::io::Result<String> {
+    read(ResourceType::Inputs, day, year)
 }
 
 pub fn read_output(day: &str, year: Year) -> std::io::Result<String> {
@@ -36,7 +43,18 @@ pub fn read_example(day: &str, year: Year) -> String {
 }
 
 fn read(resource_type: ResourceType, day: &str, year: Year) -> std::io::Result<String> {
-    let file_path = format!("resources/{}/{}/{}.in", year, resource_type, day);
+    let file_path = build_path(resource_type, day, year);
 
     read_to_string(file_path)
 }
+
+fn build_path(resource_type: ResourceType, day: &str, year: Year) -> String {
+    let format = match resource_type {
+        ResourceType::Inputs => "in",
+        ResourceType::Outputs => "out",
+        #[cfg(test)]
+        ResourceType::Examples => "in",
+    };
+
+    format!("resources/{}/{}/{}.{}", year, resource_type, day, format)
+}