# Tools Setup

## Note

We recommend using Linux or macOS for this course, we also support Windows but
typically people have more trouble getting everything working correctly on
Windows and it's harder for us to help them since we don't use Windows
ourselves.

**On Windows, if your username has spaces or special characters in it, the IDE might not
work properly. Please create a new user with a username containing only letters.**

# Step 1: Create an account on gitlab.epfl.ch

If you haven't already [log into gitlab](https://gitlab.epfl.ch/users/sign_in)
and fill in [this form](https://forms.gle/N6F3Q3jZm71AASby9) with your GASPAR and SCIPER number to initialize your GitLab repository for the course. Do this as soon as possible because it will take some time between the account creation and the lab submission system working for your account.

## Step 2: Installing the Java Development Kit (JDK) and sbt via coursier

We will use coursier to install the correct version of
Java as well as the sbt build tool:

### On Linux and macOS

```shell
curl -fLo cs https://git.io/coursier-cli-"$(uname | tr LD ld)"
```
```shell
chmod +x cs
```
```shell
./cs setup -y --jvm 8 --apps cs,sbt
```

Please reboot after this point.

### On Windows

Download and install both the [Visual C++ 2010 SP1 Redistributable
Package](https://www.microsoft.com/en-us/download/details.aspx?id=26999) and [Visual C++ 2015 Redistributable Update](https://www.microsoft.com/en-us/download/details.aspx?id=52685) (click
on "Download" then select "vcredist_x64.exe" and click "Next").

Open `cmd.exe` (and not powershell)

First, make sure that you are not in the `System32` directory, instead you
should be in `C:\Users\yourusername`. If you are in `System32` you will need to
change directory to your user directory every time you start a terminal by
running:
```shell
cd %USERPROFILE%
```

Now assuming that you're in the correct directory you can run:

```shell
bitsadmin /transfer cs-cli https://git.io/coursier-cli-windows-exe "%cd%\cs.exe"
```
```shell
.\cs setup -y --jvm 8 --apps cs,sbt
```

(This command might cause your anti-virus to misidentify cs.exe as a virus,
please override that, that might require temporarily turning off your anti-virus
during this setup).

If this command fails with `Error running powershell script`, use the following
alternative instructions (if the command didn't fail, continue to the next
step):

1. Run `.\cs setup --jvm 8 --apps cs,sbt`, at every question answer "n" and
   press Enter.
2. The last question should look like "Should we add `C:\...\bin` to your PATH?",
   please copy the `C:\...\bin` part here.
3. Edit the Path environment variable and paste the path you just copied to it, see
   https://www.architectryan.com/2018/08/31/how-to-change-environment-variables-on-windows-10/
   and make sure the path you're adding is the first entry in the Path environment
   variable.
4. Start a **new** cmd.exe and continue with the rest of the instructions

**In case of errors please ask on Discord or Gitlab issues for help, but don't
try to run commands as Administrator as this will likely cause further issues!**

Please close this terminal and open a new one after this point.

## Step 5: Installing git

git is a version control system.

### On Ubuntu and Debian

```shell
sudo apt update && sudo apt install git
```

### On macOS

First, install the Homebrew package manager if it is not already installed:

```shell
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
```

Use Homebrew to install git:

```shell
brew install git
```

### On Windows

Download and install git from [https://git-scm.com/downloads](https://git-scm.com/downloads).
Once git is installed, open a **new** terminal and run:

```shell
git config --global core.autocrlf false
```

If this command worked it will not print anything.

## Step 6: Installing Code

Visual Studio Code is the IDE we strongly recommend using for this class (you are free to use any editor you want, but we won't don't have the resources to help you configure it for Scala).

### On Linux

See [https://code.visualstudio.com/docs/setup/linux](https://code.visualstudio.com/docs/setup/linux)

### On macOS

If you don't already have Code installed:
```shell
brew install --cask visual-studio-code
```
If it was already installed before, you will need to [enable launching it from the
command line](https://code.visualstudio.com/docs/setup/mac#_launching-from-the-command-line).

### On Windows

See [https://code.visualstudio.com/docs/setup/windows](https://code.visualstudio.com/docs/setup/windows).
Make sure that the checkbox "Add to PATH (available after restart)" in the
installer is checked.

## Step 7: Installing the Scala support for Code

Open a **new** terminal and run:
```scala
code --install-extension lampepfl.dotty-syntax
```

If you're on Windows and the command is not found, try closing and restarting
the terminal, if that doesn't work

## Step 8: Generate a public/private SSH key pair

To submit labs, you will need an SSH key. If you don't already have one, here's how to generate it:

### Step 8.1: Installing OpenSSH

#### On Ubuntu and Debian

```shell
sudo apt update && sudo apt install openssh-client
```

#### On macOS

Nothing to do, OpenSSH is pre-installed

#### On Windows

Follow the instructions under "Enable OpenSSH Client in Windows 10" on
[https://winaero.com/blog/enable-openssh-client-windows-10/](https://winaero.com/blog/enable-openssh-client-windows-10/)

### Step 8.2: Generating the key pair

Please follow [this tutorial](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent) to generate a new SSH key and add it to the ssh-agent (except the last step: you should instead add the key to Gitlab as described below). This [video](https://youtu.be/_RsP81Et12s?t=67) (from 1:07 to 4:05) might also help. 

### Step 8.3: Adding your public key on Gitlab

To be able to push your code, you'll need to add the public part of your key on Gitlab:
- Go to [gitlab.epfl.ch](https://gitlab.epfl.ch), log in with your EPFL account
- Go to [gitlab.epfl.ch/-/profile/keys](https://gitlab.epfl.ch/-/profile/keys) and copy-paste the content of the `id_rsa.pub` file created by the `ssh-keygen` command you just ran (`ssh-keygen` prints the location of the file to the console).
- Press `Add key`

## Step 9: Follow the example lab

Time to do the [example lab](example-lab.md)!