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Kattis online judge command line tool

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# Kattis CLI

Kattis online judge command line tool written in Python. Requires Python 3.

# Install the client

Run `git clone https://github.com/Kattis/kattis-cli` to clone the repository.
To run the client directly, `cd` into the `kattis-cli` directory and run `python submit.py`.

See the section for your operating system below for instructions on how to install the submission client as a command runnable from anywhere on your file system.

If the `python` command is not installed, try using `python3` instead.

## Windows

To run the client as a command, you can create a file `kattis.bat` in `kattis-cli`:
```bat
@echo off
python %~dp0\submit.py %*
```

If you are using a [virtual environment](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/), replace `python` with `<venv>\Scripts\python`, where `<venv>` is the path to your environment.

To install it, you can add the `kattis-cli` directory to your `%PATH%` variable.
To do that, run `setx PATH "%PATH%;C:\Users\user\Desktop\kattis-cli"` where `C:\Users\user\Desktop\kattis-cli` is the path to your cloned repository.
You can now run the command `kattis` from anywhere!

## MacOS/Linux

To run the client as a command, you can create an executable file `kattis` in `kattis-cli`:
```sh
#!/bin/sh
python "${BASH_SOURCE%/*}/submit.py" "$@"
```

If you are using a [virtual environment](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/), replace `python` with `<venv>/bin/python`, where `<venv>` is the path to your environment.

To install it, you can add the `kattis-cli` directory to your `$PATH` variable.
To do that, open the file `~/.bash_profile` in a text editor and add the line `export PATH="$PATH:/Users/user/Desktop/kattis-cli"`, where `/Users/user/Desktop/kattis-cli` is the path to the `kattis-cli` directory, at the end of the file.
You can now run the command `kattis` from anywhere!
**Note:** You might need admin privileges to change the file.

# Configuration file

Before running the submission client, you need to [download a configuration file](https://open.kattis.com/download/kattisrc). This file includes a secret personal token that allows you to log in. It should be placed in your home directory, or in the same directory as `submit.py`, and be called `.kattisrc`.

# Running the client

The easiest way to use the client is if you have named your source code to *problemid*.suffix, where suffix is something suitable for the language (e.g., `.java` for Java, `.c` for C, `.cc` or `.cpp` for C++, `.py` for Python, `.cs` for C#, `.go` for Go, and so on...).

Let's assume you're solving the problem [Hello World!](https://open.kattis.com/problems/hello) (with problem id `hello`) and that your java solution is in the file `Hello.java`. Then you can simply run `kattis Hello.java`, and the client will make the correct guesses. You will always be prompted before a submission is sent.

## Required Packages

The client requires the `requests` and `lxml` PyPi packages.
To install them, you can `cd` into the `kattis-cli` directory and run the command `pip install -U -r requirements.txt`.
Alternatively, you can install them directly using `pip install -U requests lxml`.

While not required, it is recommended that you use a virtual environment to avoid breaking other projects.
Check out [this guide](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments) or [the documentation](https://docs.python.org/3/library/venv.html).
When installing packages or running the client, remember to activate the environment first.

If you plan to modify the client itself, the package `types-lxml` makes this more convenient in some editors.

## Common Errors

If you get an error message like this: `ModuleNotFoundError: No module named 'requests'` when you run `kattis` it's because the module 'requests' isn't installed.
To install the module, follow the above instructions or check out [this](https://stackoverflow.com/a/17309309/4132739) StackOverflow answer.
If you are using a virtual environment, make sure you activated it before installing the packages *and* before running the client.

If you get an error message like this: `This environment is externally managed` when trying to install the required packages, the recommended solution is to use a [virtual environment](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/).
Make sure to activate it before running pip. Check out [this](https://stackoverflow.com/a/75722775/5781491) StackOverflow answer for other solutions.

# More advanced options

The submit client can handle multiple files in a submission. For such submissions, the filename and suffix of the first file listed on the command line is the basis of the guesses. It is ok to list a file multiple times, e.g., `kattis Hello.java *.java` will work as intended.

In case the client guesses wrong, you can correct it by specifying a command line option. Running `kattis -h` will list all options. The options are:

* `-p <problem_id>`: overrides problem guess
* `-m <mainclass>`: overrides mainclass guess
* `-l <language>`: overrides language guess
* `-f`: forces submission (i.e., no prompt)

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