Added switch-year command to support multiple years (Multi-year sup…

…port? fspoettel#22)

Other years bins and examples are moved to `./years/YYYY/`for storage.

.cargo/config.toml

@@ -3,6 +3,7 @@ today = "run --quiet --release --features today -- today"
 scaffold = "run --quiet --release -- scaffold"
 download = "run --quiet --release -- download"
 read = "run --quiet --release -- read"
+switch-year = "run --quiet --release -- switch-year"
 
 solve = "run --quiet --release -- solve"
 all = "run --quiet --release -- all"

Cargo.toml

@@ -16,15 +16,16 @@ debug = 1
 
 [features]
 dhat-heap = ["dhat"]
-today = ["chrono"]
+today = []
 test_lib = []
 
 [dependencies]
 
 # Template dependencies
-chrono = { version = "0.4.38", optional = true }
+chrono = "0.4.38"
 dhat = { version = "0.3.3", optional = true }
 pico-args = "0.5.0"
 tinyjson = "2.5.1"
+fs_extra = "1.3.0"
 
 # Solution dependencies

src/main.rs

@@ -1,4 +1,5 @@
-use advent_of_code::template::commands::{all, download, read, scaffold, solve, time};
+use advent_of_code::template::commands::{all, download, read, scaffold, solve, switchyear, time};
+use advent_of_code::template::{ANSI_BOLD, ANSI_RESET};
 use args::{parse, AppArguments};
 
 #[cfg(feature = "today")]
@@ -7,7 +8,7 @@ use advent_of_code::template::Day;
 use std::process;
 
 mod args {
-    use advent_of_code::template::Day;
+    use advent_of_code::template::{Day, Year};
     use std::process;
 
     pub enum AppArguments {
@@ -38,6 +39,9 @@ mod args {
         },
         #[cfg(feature = "today")]
         Today,
+        SwitchYear {
+            year: Year,
+        },
     }
 
     pub fn parse() -> Result<AppArguments, Box<dyn std::error::Error>> {
@@ -76,6 +80,9 @@ mod args {
             },
             #[cfg(feature = "today")]
             Some("today") => AppArguments::Today,
+            Some("switch-year") => AppArguments::SwitchYear {
+                year: args.free_from_str()?,
+            },
             Some(x) => {
                 eprintln!("Unknown command: {x}");
                 process::exit(1);
@@ -96,6 +103,10 @@ mod args {
 }
 
 fn main() {
+    println!(
+        "🎄{ANSI_BOLD} Advent of Code {} {ANSI_RESET}🎄",
+        std::env::var("AOC_YEAR").unwrap()
+    );
     match parse() {
         Err(err) => {
             eprintln!("Error: {err}");
@@ -126,6 +137,7 @@ fn main() {
             AppArguments::Today => {
                 match Day::today() {
                     Some(day) => {
+                        switchyear::handle_today();
                         scaffold::handle(day, false);
                         download::handle(day);
                         read::handle(day)
@@ -139,6 +151,9 @@ fn main() {
                     }
                 };
             }
+            AppArguments::SwitchYear { year } => {
+                switchyear::handle(year);
+            }
         },
     };
 }

src/template/commands/mod.rs

@@ -3,4 +3,5 @@ pub mod download;
 pub mod read;
 pub mod scaffold;
 pub mod solve;
+pub mod switchyear;
 pub mod time;

src/template/commands/switchyear.rs

@@ -0,0 +1,89 @@
+use crate::template::year::Year;
+use std::{collections::HashSet, env, fs, path::PathBuf};
+
+extern crate fs_extra;
+
+pub fn handle(year: Year) {
+    let env_year = Year::__new_unchecked(env::var("AOC_YEAR").unwrap().parse().unwrap());
+    if year == env_year {
+        println!("🔔 You are already in the year you want to switch to.");
+    } else {
+        switch_to_year(year, env_year);
+        println!("🎄 Switched to year {}.", year.into_inner());
+    }
+}
+
+#[cfg(feature = "today")]
+pub fn handle_today() {
+    let year = Year::this_year().unwrap();
+    let env_year = Year::new(env::var("AOC_YEAR").unwrap().parse().unwrap()).unwrap();
+    if year != env_year {
+        switch_to_year(year, env_year);
+        println!(
+            "🎄 Automatically switched to this year: {}.",
+            year.into_inner()
+        );
+    }
+}
+
+fn clean_folder(path: PathBuf) {
+    let paths = fs::read_dir(path).unwrap();
+    let mut files = HashSet::new();
+    for path in paths {
+        let path = path.unwrap().path();
+        if path.is_file() && path.file_name().unwrap() != ".keep" {
+            files.insert(path);
+        }
+    }
+    for file in files {
+        fs::remove_file(file).unwrap();
+    }
+}
+
+pub fn switch_to_year(year: Year, previous_year: Year) {
+    let cwd = env::current_dir().unwrap();
+
+    // Move src and data files to years/
+    let src = cwd.join("src");
+    let data = cwd.join("data");
+    let bin = src.join("bin");
+    let examples = data.join("examples");
+    let inputs = data.join("inputs");
+    let puzzles = data.join("puzzles");
+    let years = cwd.join("years");
+    let destination = years.join(previous_year.into_inner().to_string());
+
+    let default_copy = fs_extra::dir::CopyOptions::new();
+    fs_extra::dir::create(&destination, true).unwrap();
+    fs_extra::dir::move_dir(&bin, &destination, &default_copy).unwrap();
+    fs_extra::dir::move_dir(&examples, &destination, &default_copy).unwrap();
+    clean_folder(inputs);
+    clean_folder(puzzles);
+
+    // Move years/ to src and data files
+    let source = years.join(year.into_inner().to_string());
+    if source.exists() {
+        let source_bin = source.join("bin");
+        let source_examples = source.join("examples");
+        fs_extra::dir::move_dir(&source_bin, &src, &default_copy).unwrap();
+        fs_extra::dir::move_dir(&source_examples, &data, &default_copy).unwrap();
+        fs_extra::dir::remove(&source).unwrap();
+    } else {
+        fs::create_dir(&bin).unwrap();
+        fs::create_dir(&examples).unwrap();
+        fs::write(bin.join(".keep"), "").unwrap();
+        fs::write(examples.join(".keep"), "").unwrap();
+    }
+
+    // Set the environment variable
+    std::env::set_var("AOC_YEAR", year.into_inner().to_string());
+
+    // Write Cargo.toml
+    let config_toml = cwd.join(".cargo").join("config.toml");
+    let config_toml_content = fs::read_to_string(&config_toml).unwrap();
+    let config_toml_updated_content = config_toml_content.replace(
+        &previous_year.into_inner().to_string(),
+        &year.into_inner().to_string(),
+    );
+    fs::write(config_toml, config_toml_updated_content).unwrap();
+}

src/template/mod.rs

@@ -5,11 +5,13 @@ pub mod commands;
 pub mod runner;
 
 pub use day::*;
+pub use year::*;
 
 mod day;
 mod readme_benchmarks;
 mod run_multi;
 mod timings;
+mod year;
 
 pub const ANSI_ITALIC: &str = "\x1b[3m";
 pub const ANSI_BOLD: &str = "\x1b[1m";

src/template/year.rs

@@ -0,0 +1,99 @@
+use std::error::Error;
+use std::fmt::Display;
+use std::str::FromStr;
+
+extern crate chrono;
+use chrono::{Datelike, FixedOffset, Utc};
+
+const SERVER_UTC_OFFSET: i32 = -5;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Year(i32);
+
+impl Year {
+    /// Creates a [`Year`] from the provided value if it's in the valid range,
+    /// returns [`None`] otherwise.
+    pub fn new(year: i32) -> Option<Self> {
+        if 2015 <= year && year <= Year::last_year().into_inner() {
+            Some(Self(year))
+        } else {
+            None
+        }
+    }
+
+    // Not part of the public API
+    #[doc(hidden)]
+    pub const fn __new_unchecked(year: i32) -> Self {
+        Self(year)
+    }
+
+    /// Converts the [`year`] into an [`i32`].
+    pub fn into_inner(self) -> i32 {
+        self.0
+    }
+
+    pub fn last_year() -> Self {
+        let offset = FixedOffset::east_opt(SERVER_UTC_OFFSET * 3600).unwrap();
+        let today = Utc::now().with_timezone(&offset);
+        if today.month() == 12 {
+            Self::__new_unchecked(today.year())
+        } else {
+            // December is not here yet, so last AoC was last year
+            Self::__new_unchecked(today.year() - 1)
+        }
+    }
+
+    /// Returns the current year.
+    pub fn this_year() -> Option<Self> {
+        let offset = FixedOffset::east_opt(SERVER_UTC_OFFSET * 3600)?;
+        let today = Utc::now().with_timezone(&offset);
+        Self::new(today.year())
+    }
+}
+
+impl Display for Year {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:04}", self.0)
+    }
+}
+
+impl PartialEq<i32> for Year {
+    fn eq(&self, other: &i32) -> bool {
+        self.0.eq(other)
+    }
+}
+
+impl PartialOrd<i32> for Year {
+    fn partial_cmp(&self, other: &i32) -> Option<std::cmp::Ordering> {
+        self.0.partial_cmp(other)
+    }
+}
+
+/* -------------------------------------------------------------------------- */
+
+impl FromStr for Year {
+    type Err = YearFromStrError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let year = s.parse().map_err(|_| YearFromStrError)?;
+        Self::new(year).ok_or(YearFromStrError)
+    }
+}
+
+/// An error which can be returned when parsing a [`year`].
+#[derive(Debug)]
+pub struct YearFromStrError;
+
+impl Error for YearFromStrError {}
+
+impl Display for YearFromStrError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(
+            format!(
+                "expecting a year number between 2015 and {}",
+                Year::last_year()
+            )
+            .as_str(),
+        )
+    }
+}