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Merge pull request #89 from codecrafters-io/add-kotlin
Add Kotlin starter templates for the "Build Your Own grep" challenge. The templates include the necessary files for compiling and running a Kotlin program on CodeCrafters. The Main.kt file contains the entry point for the grep implementation, and the pom.xml file specifies the project dependencies and build configuration. The .codecrafters/compile.sh and .codecrafters/run.sh scripts are used for compiling and running the program on CodeCrafters. The your_program.sh script is used for running the program locally. The codecrafters.yml file specifies the language pack and debug settings. The .gitignore file excludes the target/ and .idea/ directories from version control.
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‎compiled_starters/kotlin/.codecrafters/compile.sh

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#!/bin/sh
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#
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# This script is used to compile your program on CodeCrafters
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#
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# This runs before .codecrafters/run.sh
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#
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# Learn more: https://codecrafters.io/program-interface
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set -e # Exit on failure
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mvn -B package -Ddir=/tmp/codecrafters-build-grep-kotlin

‎compiled_starters/kotlin/.codecrafters/run.sh

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#!/bin/sh
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#
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# This script is used to run your program on CodeCrafters
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#
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# This runs after .codecrafters/compile.sh
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#
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# Learn more: https://codecrafters.io/program-interface
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set -e # Exit on failure
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exec java -jar /tmp/codecrafters-build-grep-kotlin/build-your-own-grep.jar "$@"

‎compiled_starters/kotlin/.gitattributes

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* text=auto

‎compiled_starters/kotlin/.gitignore

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target/
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.idea/

‎compiled_starters/kotlin/README.md

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![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/grep.png)
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This is a starting point for Kotlin solutions to the
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["Build Your Own grep" Challenge](https://app.codecrafters.io/courses/grep/overview).
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[Regular expressions](https://en.wikipedia.org/wiki/Regular_expression)
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(Regexes, for short) are patterns used to match character combinations in
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strings. [`grep`](https://en.wikipedia.org/wiki/Grep) is a CLI tool for
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searching using Regexes.
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In this challenge you'll build your own implementation of `grep`. Along the way
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we'll learn about Regex syntax, how parsers/lexers work, and how regular
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expressions are evaluated.
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**Note**: If you're viewing this repo on GitHub, head over to
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[codecrafters.io](https://codecrafters.io) to try the challenge.
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# Passing the first stage
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The entry point for your `grep` implementation is in `src/main/kotlin/Main.kt`.
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Study and uncomment the relevant code, and push your changes to pass the first
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stage:
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```sh
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git add .
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git commit -m "pass 1st stage" # any msg
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git push origin master
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```
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Time to move on to the next stage!
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# Stage 2 & beyond
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Note: This section is for stages 2 and beyond.
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1. Ensure you have `kotlin (>=2.0)` installed locally
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1. Run `./your_program.sh` to run your program, which is implemented in
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`src/main/kotlin/Main.kt`.
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1. Commit your changes and run `git push origin master` to submit your solution
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to CodeCrafters. Test output will be streamed to your terminal.

‎compiled_starters/kotlin/codecrafters.yml

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# Set this to true if you want debug logs.
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#
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# These can be VERY verbose, so we suggest turning them off
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# unless you really need them.
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debug: false
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# Use this to change the Kotlin version used to run your code
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# on Codecrafters.
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#
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# Available versions: kotlin-2.0
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language_pack: kotlin-2.0

‎compiled_starters/kotlin/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.codecrafters</groupId>
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<artifactId>build-your-own-grep</artifactId>
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<version>1.0</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<kotlin.code.style>official</kotlin.code.style>
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<kotlin.compiler.jvmTarget>21</kotlin.compiler.jvmTarget>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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<java.version>21</java.version>
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</properties>
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<repositories>
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<repository>
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<id>mavenCentral</id>
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<url>https://repo1.maven.org/maven2/</url>
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</repository>
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</repositories>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-bom</artifactId>
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<version>2.0.0</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<build>
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<sourceDirectory>src/main/kotlin</sourceDirectory>
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<plugins>
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<plugin>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-maven-plugin</artifactId>
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<version>2.0.0</version>
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<executions>
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<execution>
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<id>compile</id>
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<phase>compile</phase>
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<goals>
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<goal>compile</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-assembly-plugin</artifactId>
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<configuration>
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<finalName>${project.artifactId}</finalName> <!-- Please do not change this final artifact name-->
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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<appendAssemblyId>false</appendAssemblyId>
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<archive>
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<manifest>
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<addClasspath>true</addClasspath>
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<!-- This is the main class of your program which will be executed-->
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<mainClass>MainKt</mainClass>
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</manifest>
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</archive>
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<outputDirectory>${dir}</outputDirectory>
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</configuration>
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<executions>
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<execution>
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<id>make-assembly</id>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib</artifactId>
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</dependency>
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</dependencies>
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</project>

‎compiled_starters/kotlin/src/main/kotlin/Main.kt

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import kotlin.system.exitProcess
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fun main(args: Array<String>) {
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if (args.size != 2 || args[0] != "-E") {
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println("Usage: ./your_program.sh -E <pattern>")
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exitProcess(1)
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}
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val pattern = args[1]
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val inputLine = System.`in`.bufferedReader().readText()
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// You can use print statements as follows for debugging, they'll be visible when running tests.
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System.err.println("Logs from your program will appear here!")
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// Uncomment this block to pass the first stage
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// if (matchPattern(inputLine, pattern)) {
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// exitProcess(0)
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// } else {
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// exitProcess(1)
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// }
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}
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fun matchPattern(inputLine: String, pattern: String): Boolean {
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return if (pattern.length == 1) {
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pattern in inputLine
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} else {
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throw RuntimeException("Unhandled pattern: $pattern")
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}
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}

‎compiled_starters/kotlin/your_program.sh

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#!/bin/sh
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#
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# Use this script to run your program LOCALLY.
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#
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# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
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#
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# Learn more: https://codecrafters.io/program-interface
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set -e # Exit early if any commands fail
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# Copied from .codecrafters/compile.sh
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#
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# - Edit this to change how your program compiles locally
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# - Edit .codecrafters/compile.sh to change how your program compiles remotely
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(
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cd "$(dirname "$0")" # Ensure compile steps are run within the repository directory
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mvn -B package -Ddir=/tmp/codecrafters-build-grep-kotlin
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)
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# Copied from .codecrafters/run.sh
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#
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# - Edit this to change how your program runs locally
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# - Edit .codecrafters/run.sh to change how your program runs remotely
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exec java -jar /tmp/codecrafters-build-grep-kotlin/build-your-own-grep.jar "$@"

‎course-definition.yml

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languages:
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- slug: "cpp"
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- slug: "csharp"
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- slug: "gleam"
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- slug: "go"
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- slug: "haskell"
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release_status: "beta"
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- slug: "javascript"
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- slug: "kotlin"
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- slug: "python"
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- slug: "rust"
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- slug: "typescript"
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- slug: "ruby"
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release_status: "alpha"
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alpha_tester_usernames: ["rohitpaulk", "sreeram-venkitesh"]
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- slug: "rust"
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- slug: "csharp"
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release_status: "beta"
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- slug: "typescript"
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release_status: "beta"
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- slug: "gleam"
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release_status: "beta"
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marketing:
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difficulty: medium

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