Add compiled starter for scala

Author: cheerio-pixel

compiled_starters/scala/.codecrafters/compile.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+sbt assembly

compiled_starters/scala/.codecrafters/run.sh

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+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec java -jar ./target/scala-3.3.5/sqlite.jar "$@"

compiled_starters/scala/.gitattributes

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+* text=auto

compiled_starters/scala/.gitignore

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+**/target
+/.bloop/
+/.bsp/
+/.metals/
+/project/.bloop/
+metals.sbt
+metals/project/

compiled_starters/scala/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/sqlite.png)
+
+This is a starting point for Scala solutions to the
+["Build Your Own SQLite" Challenge](https://codecrafters.io/challenges/sqlite).
+
+In this challenge, you'll build a barebones SQLite implementation that supports
+basic SQL queries like `SELECT`. Along the way we'll learn about
+[SQLite's file format](https://www.sqlite.org/fileformat.html), how indexed data
+is
+[stored in B-trees](https://jvns.ca/blog/2014/10/02/how-does-sqlite-work-part-2-btrees/)
+and more.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your SQLite implementation is in `src/main/scala/Main.scala`.
+Study and uncomment the relevant code, and push your changes to pass the first
+stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `mvn` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `src/main/scala/Main.scala`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
+
+# Sample Databases
+
+To make it easy to test queries locally, we've added a sample database in the
+root of this repository: `sample.db`.
+
+This contains two tables: `apples` & `oranges`. You can use this to test your
+implementation for the first 6 stages.
+
+You can explore this database by running queries against it like this:
+
+```sh
+$ sqlite3 sample.db "select id, name from apples"
+1|Granny Smith
+2|Fuji
+3|Honeycrisp
+4|Golden Delicious
+```
+
+There are two other databases that you can use:
+
+1. `superheroes.db`:
+   - This is a small version of the test database used in the table-scan stage.
+   - It contains one table: `superheroes`.
+   - It is ~1MB in size.
+1. `companies.db`:
+   - This is a small version of the test database used in the index-scan stage.
+   - It contains one table: `companies`, and one index: `idx_companies_country`
+   - It is ~7MB in size.
+
+These aren't included in the repository because they're large in size. You can
+download them by running this script:
+
+```sh
+./download_sample_databases.sh
+```
+
+If the script doesn't work for some reason, you can download the databases
+directly from
+[codecrafters-io/sample-sqlite-databases](https://github.com/codecrafters-io/sample-sqlite-databases).

compiled_starters/scala/build.sbt

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+ThisBuild / scalaVersion := "3.3.5"
+ThisBuild / version := "0.1.0-SNAPSHOT"
+ThisBuild / organization := "com.CodeCrafters"
+ThisBuild / organizationName := "CodeCrafters"
+
+assembly / assemblyJarName := "sqlite"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "codecrafter-sqlite",
+    // List your dependencies here
+    libraryDependencies ++= Seq(
+    ),
+  )

compiled_starters/scala/codecrafters.yml

@@ -0,0 +1,11 @@
+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Java version used to run your code
+# on Codecrafters.
+#
+# Available versions: java-23
+language_pack: java-17

compiled_starters/scala/download_sample_databases.sh

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+#!/bin/sh
+
+echo "Downloading superheroes.db: ~1MB (used in stage 7)"
+curl -Lo superheroes.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/superheroes.db
+
+echo "Downloading companies.db: ~7MB (used in stage 8)"
+curl -Lo companies.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/companies.db
+
+echo "Sample databases downloaded."

compiled_starters/scala/project/build.properties

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+sbt.version=1.10.7

compiled_starters/scala/project/plugins.sbt

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+
+
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")

compiled_starters/scala/sample.db

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+import java.io.File
+import java.io.FileInputStream
+import java.io.IOException
+import java.nio.ByteBuffer
+
+object Main extends App {
+  if args.length < 2
+  then {
+    println("Missing <database path> and <command>")
+    System.exit(0);
+  }
+  val databaseFilePath = args(0);
+  val command = args(1);
+  command match {
+    case ".dbinfo" => {
+      val databaseFile = new FileInputStream(new File(databaseFilePath))
+      databaseFile.skip(16)
+      val pageSizeBytes = new Array[Byte](2)
+      databaseFile.read(pageSizeBytes)
+      val pageSizeSigned = ByteBuffer.wrap(pageSizeBytes).getShort()
+      val pageSize = pageSizeSigned & 0xFFFF
+      println("database page size: " + pageSize)
+    }
+    case _ => println("Missing or invalid command passed: " + command)
+  }
+}

compiled_starters/scala/src/main/scala/Main.scala

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+#!/bin/sh
+#
+# Use this script to run your program LOCALLY.
+#
+# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit early if any commands fail
+
+# Copied from .codecrafters/compile.sh
+#
+# - Edit this to change how your program compiles locally
+# - Edit .codecrafters/compile.sh to change how your program compiles remotely
+(
+  cd "$(dirname "$0")" # Ensure compile steps are run within the repository directory
+  sbt assembly
+)
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec java -jar ./target/scala-3.3.5/sqlite.jar "$@"

compiled_starters/scala/your_program.sh

@@ -0,0 +1,35 @@
+--- starter_templates/scala/code/src/main/scala/Main.scala	2025-03-27 19:30:51.374671531 -0400
++++ solutions/scala/01-dr6/code/src/main/scala/Main.scala	2025-03-27 19:22:20.930550947 -0400
+@@ -1,31 +1,26 @@
+ import java.io.File
+ import java.io.FileInputStream
+ import java.io.IOException
+ import java.nio.ByteBuffer
+ 
+ object Main extends App {
+   if args.length < 2
+   then {
+     println("Missing <database path> and <command>")
+     System.exit(0);
+   }
+   val databaseFilePath = args(0);
+   val command = args(1);
+   command match {
+     case ".dbinfo" => {
+       val databaseFile = new FileInputStream(new File(databaseFilePath))
+       databaseFile.skip(16)
+       val pageSizeBytes = new Array[Byte](2)
+       databaseFile.read(pageSizeBytes)
+       val pageSizeSigned = ByteBuffer.wrap(pageSizeBytes).getShort()
+       val pageSize = pageSizeSigned & 0xFFFF
+-
+-      // You can use print statements as follows for debugging, they'll be visible when running tests.
+-      System.err.println("Logs from your program will appear here!")
+-
+-      // Uncomment this block to pass the first stage
+-      // println("database page size: " + pageSize)
++      println("database page size: " + pageSize)
+     }
+     case _ => println("Missing or invalid command passed: " + command)
+   }
+ }

solutions/scala/01-dr6/diff/src/main/java/Main.java.diff

@@ -19,7 +19,12 @@ object Main extends App {
       databaseFile.read(pageSizeBytes)
       val pageSizeSigned = ByteBuffer.wrap(pageSizeBytes).getShort()
       val pageSize = pageSizeSigned & 0xFFFF
-      println("database page size: " + pageSize)
+
+      // You can use print statements as follows for debugging, they'll be visible when running tests.
+      System.err.println("Logs from your program will appear here!")
+
+      // Uncomment this block to pass the first stage
+      // println("database page size: " + pageSize)
     }
     case _ => println("Missing or invalid command passed: " + command)
   }