scalacenter · bishabosha · Nov 21, 2025 · Nov 18, 2025 · Nov 18, 2025
diff --git a/.github/workflows/add-daily-article.yml b/.github/workflows/add-daily-article.yml
@@ -19,11 +19,11 @@ jobs:
           ref: website
           submodules: true
 
-      - uses: coursier/cache-action@v6
+      - uses: coursier/cache-action@v7
 
-      - uses: VirtusLab/scala-cli-setup@v0.1.18
+      - uses: VirtusLab/scala-cli-setup@v1.10.1
         with:
-          jvm: "temurin:17"
+          jvm: "temurin:21"
 
       - name: Generate todays article
         run: scala-cli run .github/workflows/scripts/addDay.scala

diff --git a/.github/workflows/schedule-add-daily-article.yml b/.github/workflows/schedule-add-daily-article.yml
@@ -20,11 +20,11 @@ jobs:
           ref: website
           submodules: true
 
-      - uses: coursier/cache-action@v6
+      - uses: coursier/cache-action@v7
 
-      - uses: VirtusLab/scala-cli-setup@v0.1.18
+      - uses: VirtusLab/scala-cli-setup@v1.10.1
         with:
-          jvm: "temurin:17"
+          jvm: "temurin:21"
           apps: sbt
 
       - name: Generate todays article

diff --git a/2024/README.md b/2024/README.md
@@ -0,0 +1,66 @@
+# Scala Advent of Code 2024
+
+Solutions in Scala for the annual [Advent of Code (adventofcode.com)](https://adventofcode.com/) challenge.
+
+_Note: this repo is not affiliated with Advent of Code._
+
+See earlier editions:
+
+- [2021](/2021/README.md)
+- [2022](/2022/README.md)
+- [2023](/2023/README.md)
+
+## Website
+
+The [Scala Advent of Code](https://scalacenter.github.io/scala-advent-of-code/) website contains:
+
+- some explanation of our solutions to [Advent of Code](https://adventofcode.com/)
+- more solutions from the community
+
+## Setup
+
+We use Visual Studio Code with Metals to write Scala code, and scala-cli to compile and run it.
+
+You can follow these [steps](https://scalacenter.github.io/scala-advent-of-code/setup) to set up your environement.
+
+### How to open in Visual Studio Code
+
+After you clone the repository, open a terminal and run:
+```
+$ cd scala-advent-of-code
+$ scala-cli setup-ide 2024
+$ mkdir 2024/input
+$ code 2024
+```
+
+`code 2024` will open Visual Studio Code and start Metals. If not you may have to go to the Metals pane and click
+the button labelled "Start Metals".
+
+When you navigate to a file, e.g. `2024/src/day01.scala` metals should index the project, and then display code lenses
+above each of the main methods `part1` and `part2`, as shown in this image:
+![](../img/code-lenses.png)
+
+To run a solution, first copy your input to the folder `2024/input`.
+Then click `run` in VS Code which will run the code and display the results of the program. Or `debug`,
+which will let you pause on breakpoints, and execute expressions in the debug console.
+
+### How to run a solution with command line
+
+To run a solution, first copy your input to the folder `2024/input`.
+
+In a terminal you can run:
+```
+$ scala-cli 2024 -M day01.part1
+Compiling project (Scala 3.x.y, JVM)
+Compiled project (Scala 3.x.y, JVM)
+The solution is 64929
+```
+
+Or, to run another solution:
+```
+$ scala-cli 2024 -M <dayX>.<partX>
+```
+
+## Contributing
+
+- Please do not commit your puzzle inputs, we can not accept them as they are protected by copyright
diff --git a/2025/project.scala b/2025/project.scala
@@ -0,0 +1,3 @@
+//> using scala 3.7.4
+//> using option -Wunused:all
+//> using test.dep org.scalameta::munit::1.2.1
diff --git a/2025/src/inputs.scala b/2025/src/inputs.scala
@@ -0,0 +1,9 @@
+package inputs
+
+import scala.util.Using
+import scala.io.Source
+
+object Input:
+
+  def loadFileSync(path: String): String =
+    Using.resource(Source.fromFile(path))(_.mkString)
diff --git a/2025/src/locations.scala b/2025/src/locations.scala
@@ -0,0 +1,19 @@
+package locations
+
+import scala.quoted.*
+
+object Directory:
+
+  /** The absolute path of the parent directory of the file that calls this method
+    * This is stable no matter which directory runs the program.
+    */
+  inline def currentDir: String = ${ parentDirImpl }
+
+  private def parentDirImpl(using Quotes): Expr[String] =
+    // position of the call to `currentDir` in the source code
+    val position = quotes.reflect.Position.ofMacroExpansion
+    // get the path of the file calling this macro
+    val srcFilePath = position.sourceFile.getJPath.get
+    // get the parent of the path, which is the directory containing the file
+    val parentDir = srcFilePath.getParent().toAbsolutePath
+    Expr(parentDir.toString) // convert the String to Expr[String]
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Scala Advent of Code 2024
+# Scala Advent of Code 2025
 
 Solutions in Scala for the annual [Advent of Code (adventofcode.com)](https://adventofcode.com/) challenge.
 
@@ -9,6 +9,7 @@ See earlier editions:
 - [2021](/2021/README.md)
 - [2022](/2022/README.md)
 - [2023](/2023/README.md)
+- [2024](/2024/README.md)
 
 ## Website
 
@@ -19,7 +20,7 @@ The [Scala Advent of Code](https://scalacenter.github.io/scala-advent-of-code/)
 
 ## Setup
 
-We use Visual Studio Code with Metals to write Scala code, and scala-cli to compile and run it.
+We use Visual Studio Code with Metals to write Scala code, and Scala-CLI to compile and run it. (Scala-CLI has been the default `scala` command since Scala 3.5.)
 
 You can follow these [steps](https://scalacenter.github.io/scala-advent-of-code/setup) to set up your environement.
 
@@ -28,39 +29,39 @@ You can follow these [steps](https://scalacenter.github.io/scala-advent-of-code/
 After you clone the repository, open a terminal and run:
 ```
 $ cd scala-advent-of-code
-$ scala-cli setup-ide 2024
-$ mkdir 2024/input
-$ code 2024
+$ scala setup-ide 2025
+$ mkdir 2025/input
+$ code 2025
 ```
 
-`code 2024` will open Visual Studio Code and start Metals. If not you may have to go to the Metals pane and click
+`code 2025` will open Visual Studio Code and start Metals. If not you may have to go to the Metals pane and click
 the button labelled "Start Metals".
 
-When you navigate to a file, e.g. `2024/src/day01.scala` metals should index the project, and then display code lenses
+When you navigate to a file, e.g. `2025/src/day01.scala`, Metals should index the project, and then display code lenses
 above each of the main methods `part1` and `part2`, as shown in this image:
 ![](img/code-lenses.png)
 
-To run a solution, first copy your input to the folder `2024/input`.
+To run a solution, first copy your input to the folder `2025/input`.
 Then click `run` in VS Code which will run the code and display the results of the program. Or `debug`,
 which will let you pause on breakpoints, and execute expressions in the debug console.
 
 ### How to run a solution with command line
 
-To run a solution, first copy your input to the folder `2024/input`.
+To run a solution, first copy your input to the folder `2025/input`.
 
 In a terminal you can run:
 ```
-$ scala-cli 2024 -M day01.part1
+$ scala 2025 -M day01.part1
 Compiling project (Scala 3.x.y, JVM)
 Compiled project (Scala 3.x.y, JVM)
 The solution is 64929
 ```
 
 Or, to run another solution:
 ```
-$ scala-cli 2024 -M <dayX>.<partX>
+$ scala 2025 -M <dayX>.<partX>
 ```
 
 ## Contributing
 
-- Please do not commit your puzzle inputs, we can not accept them as they are protected by copyright
+Please do not commit your puzzle inputs; we can not accept them, as they are protected by copyright