Merge pull request #5 from codecrafters-io/CC-1274-java

Add Java support

Author: glokta1

compiled_starters/java/.gitattributes

@@ -0,0 +1 @@
+* text=auto

compiled_starters/java/.gitignore

@@ -0,0 +1,4 @@
+java_shell.jar
+target/*
+target/
+.idea/

compiled_starters/java/README.md

@@ -0,0 +1,36 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/shell.png)
+
+This is a starting point for Java solutions to the
+["Build Your Own Shell" Challenge](https://app.codecrafters.io/courses/shell/overview).
+
+In this challenge, you'll build your own POSIX compliant shell that's capable of
+interpreting shell commands, running external programs and builtin commands like
+cd, pwd, echo and more. Along the way, you'll learn about shell command parsing,
+REPLs, builtin commands, 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 `shell` implementation is in `src/main/java/Main.java`.
+Study and uncomment the relevant code, and push your changes to pass the first
+stage:
+
+```sh
+git add .
+git commit -m "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 `java (21)` installed locally
+1. Run `./your_shell.sh` to run your program, which is implemented in
+   `src/main/java/Main.java`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

compiled_starters/java/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-21
+language_pack: java-21

compiled_starters/java/pom.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>io.codecrafters</groupId>
+    <artifactId>build-your-own-shell</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>21</java.version>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <finalName>java_shell</finalName> <!-- Please do not change this final artifact name-->
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <appendAssemblyId>false</appendAssemblyId>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <!-- This is the main class of your program which will be executed-->
+                            <mainClass>Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <outputDirectory>${dir}</outputDirectory>
+                </configuration>
+
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

compiled_starters/java/src/main/java/Main.java

@@ -0,0 +1,15 @@
+// Uncomment this block to pass the first stage
+// import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        // You can use print statements as follows for debugging, they'll be visible when running tests.
+        System.out.println("Logs from your program will appear here!");
+
+        // Uncomment this block to pass the first stage
+        // System.out.print("$ ");
+        //
+        // Scanner scanner = new Scanner(System.in);
+        // String input = scanner.nextLine();
+    }
+}

compiled_starters/java/your_shell.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+set -e
+mvn -B --quiet package -Ddir=/tmp/codecrafters-shell-target
+exec java -jar /tmp/codecrafters-shell-target/java_shell.jar "$@"

course-definition.yml

@@ -19,6 +19,7 @@ languages:
   - slug: "go"
   - slug: "python"
   - slug: "rust"
+  - slug: "java"
   - slug: "javascript"
   - slug: "c"
 

dockerfiles/java-21.Dockerfile

@@ -0,0 +1,16 @@
+FROM maven:3.9.5-eclipse-temurin-21-alpine
+
+COPY pom.xml /app/pom.xml
+
+WORKDIR /app
+
+# Download the dependencies
+RUN mvn -B package -Ddir=/tmp/codecrafters-shell-target
+
+# Cache Dependencies
+RUN mkdir -p /app-cached
+RUN mv /app/target /app-cached # Is this needed?
+
+# Pre-compile steps
+RUN printf "cd \${CODECRAFTERS_SUBMISSION_DIR} && mvn -B package -Ddir=/tmp/codecrafters-shell-target && sed -i 's/^\(mvn .*\)/#\1/' ./your_shell.sh" > /codecrafters-precompile.sh
+RUN chmod +x /codecrafters-precompile.sh

solutions/java/01-oo8/code/.gitattributes

@@ -0,0 +1 @@
+* text=auto