refactor: use feature flag for chrono

.cargo/config.toml

@@ -1,5 +1,5 @@
 [alias]
-today = "run --quiet --release -- today"
+today = "run --quiet --release --features today -- today"
 scaffold = "run --quiet --release -- scaffold"
 download = "run --quiet --release -- download"
 read = "run --quiet --release -- read"

Cargo.toml

@@ -10,15 +10,16 @@ publish = false
 [lib]
 doctest = false
 
+[profile.dhat]
+inherits = "release"
+debug = 1
+
 [features]
+today = ["chrono"]
 test_lib = []
 dhat-heap = ["dhat"]
 
 [dependencies]
-chrono = "0.4.31"
+chrono = { version = "0.4.31", optional = true }
 pico-args = "0.5.0"
 dhat = { version = "0.3.2", optional = true }
-
-[profile.dhat]
-inherits = "release"
-debug = 1

README.md

@@ -161,7 +161,16 @@ cargo read <day>
 
 ### Scaffold, download and read in one go
 
-This command runs `cargo scaffold --download`, and `cargo read` for the current day.
+> [!IMPORTANT]
+> This command requires [installing the aoc-cli crate](#configure-aoc-cli-integration).
+
+During december, the `today` shorthand command can be used to:
+
+ - scaffold a solution for the current day
+ - download its input
+ - and read the puzzle
+
+in one go.
 
 ```sh
 # example: `cargo today` on December 1st

src/main.rs

@@ -1,11 +1,11 @@
-use std::process;
-
-use advent_of_code::template::{
-    commands::{all, download, read, scaffold, solve},
-    Day,
-};
+use advent_of_code::template::commands::{all, download, read, scaffold, solve};
 use args::{parse, AppArguments};
 
+#[cfg(feature = "today")]
+use advent_of_code::template::Day;
+#[cfg(feature = "today")]
+use std::process;
+
 mod args {
     use advent_of_code::template::Day;
     use std::process;
@@ -21,7 +21,6 @@ mod args {
             day: Day,
             download: bool,
         },
-        Today,
         Solve {
             day: Day,
             release: bool,
@@ -33,6 +32,8 @@ mod args {
             release: bool,
             time: bool,
         },
+        #[cfg(feature = "today")]
+        Today,
     }
 
     pub fn parse() -> Result<AppArguments, Box<dyn std::error::Error>> {
@@ -60,6 +61,7 @@ mod args {
                 time: args.contains("--time"),
                 dhat: args.contains("--dhat"),
             },
+            #[cfg(feature = "today")]
             Some("today") => AppArguments::Today,
             Some(x) => {
                 eprintln!("Unknown command: {x}");
@@ -103,6 +105,7 @@ fn main() {
                 dhat,
                 submit,
             } => solve::handle(day, release, time, dhat, submit),
+            #[cfg(feature = "today")]
             AppArguments::Today => {
                 match Day::today() {
                     Some(day) => {

src/template/day.rs

@@ -1,8 +1,10 @@
-use chrono::{Datelike, Local};
 use std::error::Error;
 use std::fmt::Display;
 use std::str::FromStr;
 
+#[cfg(feature = "today")]
+use chrono::{Datelike, Local};
+
 /// A valid day number of advent (i.e. an integer in range 1 to 25).
 ///
 /// # Display
@@ -38,6 +40,7 @@ impl Day {
     }
 }
 
+#[cfg(feature = "today")]
 impl Day {
     /// Returns the current day if it's between the 1st and the 25th of december, `None` otherwise.
     pub fn today() -> Option<Self> {