# Exercism Kotlin Track
[![Build Status](https://travis-ci.org/exercism/kotlin.svg?branch=master)](https://travis-ci.org/exercism/kotlin)
Source for Exercism Exercises in Kotlin.
## Contributing Guide
For general information about how to contribute to Exercism, please refer to the [contributing guide](https://exercism.org/docs/building).
## Table of Contents
* [Overview](#overview)
* [Contributing With Minimal Setup](#contributing-with-minimal-setup)
* [Getting Familiar With the Codebase](#getting-familiar-with-the-codebase)
* [The `exercises` Module](#the-exercises-module)
* [The Problem Submodules](#the-problem-submodules)
* [Advanced: Complete Local Setup](#advanced-complete-local-setup)
* [Tip: `gradle clean` before `exercism fetch`](#tip-gradle-clean-before-exercism-fetch)
## Overview
This guide covers contributing to the Kotlin track. If you are new, this guide is for you.
If, at any point, you're having any trouble, pop in the [Building Exercism](https://forum.exercism.org/c/exercism/building-exercism/125) category of the [Exercism forum](https://forum.exercism.org/) for help.
## Contributing With Minimal Setup
First things first: by contributing to Exercism, you are making this learning tool that much better and improving our industry as a whole... thank you!!!
To submit a fix for an existing exercise or port an exercise to Kotlin with the least amount of setup:
1. **Ensure you have the basic Java tooling installed:** JDK 1.8+, an editor and Gradle 2.x.
(see [exercism.io: Installing Kotlin](https://exercism.org/docs/tracks/kotlin/installation))
- **Setup a branch on a fork of [exercism/kotlin](https://github.com/exercism/kotlin) on your computer.**
Next steps:
* "fork" a repository on GitHub;
- install `git`;
- "clone" a copy of your fork;
- configure an "upstream remote" (in this case, `exercism/kotlin`);
- create a branch to house your work
- **Write the codes.** Do your work on that branch you just created.
The [Getting Familiar With the Codebase](#getting-familiar-with-the-codebase) section, below, is an orientation.
- **Commit, push and create a pull request.**
Something like:
```
$ git add .
$ git commit -m "(An intention-revealing commit message)"
$ git push
```
It is advised you write meaningful commit messages. [Chris Beams wrote about "How to Write a Git Commit Message"](https://chris.beams.io/posts/git-commit/).
- **Verify that your work passes all tests.** When you create a pull request (PR), GitHub triggers a build on Travis CI. Your PR will not be merged unless those tests pass.
## Getting Familiar With the Codebase
There are two objectives to the design of this build:
1. when a problem is built from within the `exercism/kotlin` repo (i.e. when you, the contributor, are developing the exercise), the tests run against the reference solution;
2. when a problem is built outside the `exercism/kotlin` repo (when a participant is solving the exercise), the tests run against the "main" code.
This repo is a multi-project gradle build.
### The `exercises` Module
This is the top-level module, contained in the `exercises` directory. It is a container for the problem sub-modules.
* its `build.gradle` points the "main" sourceset to the reference solution.
* its `settings.gradle` names each of the subprojects, one for each problem in the set.
### The Problem Submodules
The `exercises` subdirectory contains all of the problem submodules.
Each problem/submodule is a subdirectory of the same name as its slug.
* its `build.gradle.kts` names dependencies required to work that problem.
Each problem/submodule has three source sets:
* `src/test/kotlin/` — a test suite defining the edges of the problem
* `.meta/src/reference/kotlin/` — a reference solution that passes all the tests
* `src/main/kotlin/` — starter source files, if required/desired *(this directory usually only has a `.keep` file in it)*.
To run the tests for a specific exercise, run the `test` Gradle task from the exercises
directory. For example:
```bash
cd exercises
https://github.com/exercism/v3/blob/main/gradlew bob:test
```
Steps for modifying an exercise:
1. Change the test(s).
2. Watch the changes fail.
3. Update the reference solution to make the test(s) pass.
----
## Advanced: Complete Local Setup
If you are going to make significant contribution(s) to the track, you might find it handy to have a complete local install of exercism on your computer. This way, you can run the full suite of tests without having to create/update a PR.
The easiest way to achieve this is simply use the `bin/journey-test.sh` script. However, you may want to perform other tests, depending on what you are doing. You can do so by duplicating the setup performed by the `bin/journey-test.sh` script.
### Tip: `gradle clean` before `exercism fetch`
If you `exercism fetch` after doing a build, the CLI will fail with the following error message:
```
$ exercism fetch kotlin bob
2015/09/06 15:03:21 an internal server error was received.
Please file a bug report with the contents of 'exercism debug' at: https://github.com/exercism/exercism.io/issues
```
and if you review the logs of your x-api, you'll find:
```
127.0.0.1 - - [06/Sep/2015:15:20:56 -0700] "GET /v2/exercises/kotlin/bob HTTP/1.1" 500 514949 0.2138
2015-09-06 15:21:01 - JSON::GeneratorError - source sequence is illegal/malformed utf-8:
```
This is because some files generated by the build can't be served from the x-api. This is by design: the CLI does not serve binaries. To fix this, simply make sure you do a clean in your `exercism/kotlin` repo before you fetch:
```
cd ~/workspace/exercism/kotlin/exercises
gradle clean
cd ~/workspace/exercism/exercises
exercism fetch kotlin bob
```
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