CodeRunner

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This project allows you to run a code-running server, based on Elixir, that can compile and execute code and communicate via websockets. Thus, if you want to develop some interactive online courses, this is probably a good way to start. This README is also a self-contained LiaScript template, that defines some basic macros, which can be used to make your Markdown code-snippets executable.

Try it on LiaScript:

https://liascript.github.io/course/?https://github.com/liascript/CodeRunner

See the project on Github:

https://github.com/liascript/CodeRunner

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There are three ways to use this template. The easiest way is to use the import statement and the URL of the raw text-file of the master branch or any other branch or version. But you can also copy the required functionality directly into the header of your Markdown document, see therefor the last slide. And of course, you could also clone this project and change it, as you wish.

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1. Load the macros via

   import: https://github.com/liascript/CodeRunner

2. Copy the definitions into your Project

3. Clone this repository on GitHub

@LIA.eval

You only have to attach the command @LIA.eval to your code-block or project and pass three parameters.

1. The first, is a list of filenames, the number of sequential code-blocks defines the naming order.
2. Then pass the command how your code should be compiled
3. And as the last part, how to execute your code.

```c
#include <stdio.h>

int main (void){
  printf ("Hello, world \n");

	return 0;
}
```
@LIA.eval(`["main.c"]`, `gcc -Wall main.c -o a.out`, `./a.out`)

You can currently use python 2 and 3, gcc, g++, avr-g++, arduino-builder, clang, and javac.

C

#include <stdio.h>

int main (void){
	int i = 0;
	int max = 0;

	printf("How many hellos: ");
	scanf("%d",&max);

  for(i=0; i<max; i++)
    printf ("Hello, world %d!\n", i);

	return 0;
}

@LIA.eval(["main.c"], gcc -Wall main.c -o a.out, ./a.out)

C++

#include <stdio.h>

int main (void){
	int i = 0;
	int max = 0;

	printf("How many hellos: ");
	scanf("%d",&max);

  for(i=0; i<max; i++)
    printf ("Hello, world %d!\n", i);

	return 0;
}

@LIA.eval(["main.cpp"], g++ main.cpp -o a.out, ./a.out)

C# dotnet

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;

int n;
Console.Write("Number of primes: ");
n = int.Parse(Console.ReadLine());

ArrayList primes = new ArrayList();
primes.Add(2);

for(int i = 3; primes.Count < n; i++) {
	bool isPrime = true;
	foreach(int num in primes) isPrime &= i % num != 0;
	if(isPrime) primes.Add(i);
}

Console.Write("Primes: ");
foreach(int prime in primes) Console.Write($" {prime}");

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>
</Project>

@LIA.eval(["Program.cs", "project.csproj"], dotnet build -nologo, dotnet run -nologo)

C# mono

/*
 * C# Program to Check whether the Entered Number is Even or Odd
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace check1
{
    class Program
    {
        static void Main(string[] args)
        {
            int i;
            Console.Write("Enter a Number : ");
            i = int.Parse(Console.ReadLine());
            if (i % 2 == 0)
            {
                Console.Write("Entered Number is an Even Number");
            }
            else
            {
                Console.Write("Entered Number is an Odd Number");
            }
        }
    }
}

@LIA.eval(["main.cs"], mono main.cs, mono main.exe)

Go

package main

import "fmt"

func main() {
  fmt.Println("hello world")
}

@LIA.eval(["main.go"], go build main.go, ./main)

Haskell

main = putStrLn "hello world"

@LIA.eval(["main.hs"], ghc main.hs -o main, ./main)

Java

import java.io.*;
class Demo {
public static void main(String args[])
throws IOException
{
  // create a BufferedReader using System.in
  BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));
   String str;

 System.out.println("Enter lines of text.");
 System.out.println("Enter 'stop' to quit.");
   do {

    str = obj.readLine();
    System.err.println(str);
  }   while(!str.equals("stop"));
}
}

@LIA.eval(["Demo.java"], javac Demo.java, java Demo)

Python2

for i in range(10):
  print "Hallo Welt", i

@LIA.eval(["main.py"], python -m compileall ., python main.pyc)

Python3

for i in range(10):
  print("Hallo Welt", i)

@LIA.eval(["main.py"], python3 -m compileall ., python3 main.py)

R

print("Hello World")

@LIA.eval(["main.R"], none, Rscript main.R)

library(ggplot2)

# Use stdout as per normal...
print("Hello, world!")

# Use plots...
png(file="out1.png")
plot(cars)

# Even ggplot!
png(file="out2.png")
qplot(wt, mpg, data = mtcars, colour = factor(cyl))

@LIA.eval(["main.R"], none, Rscript main.R)

Rust

fn main() {
  println!("Hello World!");
}

@LIA.eval(["hello.rs"], rustc hello.rs, ./hello)

@LIA.evalWithDebug

This does basically the same as @LIA.eval, but it will add additional Debug-information about the CodeRunner status to the console.

#include <stdio.h>

int main (void){
	int i = 0;
	int max = 0;

	printf("How many hellos: ");
	scanf("%d",&max);

  for(i=0; i<max; i++)
    printf ("Hello, world %d!\n", i);

	return 0;
}

@LIA.evalWithDebug(["main.c"], gcc -Wall main.c -o a.out, ./a.out)

Deploying to Heroku

If you deploy this to heroku, as we do, keep in mind, that the free service will be shut down, if no one uses it for 30 minutes, it takes round about 30 sec. to resurrect.

1. Install the Heroku-CLI

2. Create a new Heroku project

   1. Login to Heroku: heroku login (Don't use sudo or it will not work!)
   2. Create the project: heroku create [app_name]

3. Login to Heroku container: heroku container:login (It's important that you have docker installed before executing this command and make sure that your user is added to the docker group.)

4. Build the docker container and upload it to heroku:

   docker build . -t web

   heroku container:push web -a app_name

5. Release the docker container: heroku container:release web -a app_name

Your project url is now app_name.herokuapp.com. (Or the auto-generated one when you haven't supplied an app name.)

If you deploy your own server, you have to change the websocket-url in the main header (main HTML comment of your Markdown document) from wss://liarunner.herokuapp.com/socket to wss://*******.herokuapp.com/socket ... what ever the name of your app is ...

Implementation

                          --{{0}}--

If you want to minimize loading effort in your LiaScript project, you can also copy this code and paste it into your main comment header, see the code in the raw file of this document.

{{1}} https://raw.githubusercontent.com/liaScript/CodeRunner/master/README.md

script:   https://cdn.jsdelivr.net/npm/phoenix-js@1.0.3/dist/glob/main.js

@LIA.eval: @LIA.eval_(false,@uid,`@0`,@1,@2)
@LIA.evalWithDebug: @LIA.eval_(true,@uid,`@0`,@1,@2)

@LIA.eval_
<script>
var hash = Math.random().toString(36).replace(/[^a-z]+/g, '')
var ROOT_SOCKET = 'wss://liarunner.herokuapp.com/socket'; // default path is /socket

var socket = new Socket(ROOT_SOCKET,
  { timeout: 30000,
  logger: function(kind, msg, data) {
      window.console.log(`${kind}: ${msg}`, data)
  }
});

socket.connect(); // connect
var chan = socket.channel("lia:"+hash);

let current_retries = 0;

const timer = (() => {
  let counter = 105; // seconds (found by testing)

  send.lia("LIA: terminal")
  send.lia("LIA: stop")

  const timerHandle = setInterval(() => {
    console.clear();
    if(counter > 0) {
        counter--;
        if(counter < 95) console.log(`ETA until execution: ${counter}s, Retries: ${current_retries}`);
    }
    else if(counter <= 0) {
      console.log(`Couldn't reach server in the estimated time. Is your internet connection working?`)
    }
  }, 1000);

  const stop = () => {
    clearInterval(timerHandle);
    console.clear();
  };

  const timer = {
    stop: stop
  };

  return timer;
})();

chan.on("service", (e) => {
  if (e.message.stderr)
    console.error(e.message.stderr)
  else if (e.message.stdout) {
    if (!e.message.stdout.startsWith("Warning: cannot switch "))
      console.stream(e.message.stdout)
  }
  else if (e.message.exit) {
    if(@0) console.debug(e.message.exit)
    send.lia("LIA: stop")
  }
})

// error hook gets called, when a reconnect is attemted
socket.onError((e) => {
  current_retries++
})

var order = @2
var files = {}

if (order[0])
  files[order[0]] = `@input(0)`
if (order[1])
  files[order[1]] = `@input(1)`
if (order[2])
  files[order[2]] = `@input(2)`
if (order[3])
  files[order[3]] = `@input(3)`
if (order[4])
  files[order[4]] = `@input(4)`
if (order[5])
  files[order[5]] = `@input(5)`
if (order[6])
  files[order[6]] = `@input(6)`
if (order[7])
  files[order[7]] = `@input(7)`
if (order[8])
  files[order[8]] = `@input(8)`
if (order[9])
  files[order[9]] = `@input(9)`


chan.join()
.receive("ok", (e) => {
    chan.push("lia", {event_id: "@1", message: {start: "CodeRunner", settings: null}})
    .receive("ok", (e) => {
        chan.push("lia", {event_id: "@1", message: {files: files}})
        .receive("ok", (e) => {
            if(@0) console.debug(e.message)
            chan.push("lia", {event_id: "@1", message: {compile: @3, order: order}})
            .receive("ok", (e) => {
                if(@0) console.debug(e.message)
                chan.push("lia", {event_id: "@1", message: {execute: @4}})
                .receive("ok", (e) => {
                    timer.stop();
                    send.lia("LIA: terminal")
                })
                .receive("error", (e) => {
                    timer.stop();
                    console.err("could not start application => ", e)
                    chan.push("lia", {event_id: "@1", message: {stop: ""}})
                    send.lia("LIA: stop")
                })
            })
            .receive("error", (e) => {
                timer.stop();
                send.lia(e.message, e.details, false)
                chan.push("lia", {event_id: "@1", message: {stop: ""}})
                send.lia("LIA: stop")
            })
        })
        .receive("error", (e) => {
            timer.stop();
            lia.error("could not setup files => ", e)
            chan.push("lia", {event_id: "@1", message: {stop: ""}})
            send.lia("LIA: stop")
        })
    })
    .receive("error", (e) => {
        timer.stop();
        lia.error("could not start service => ", e)
        chan.push("lia", {event_id: "@1", message: {stop: ""}})
        send.lia("LIA: stop")
    })
})
.receive("error", (e) => {
  timer.stop();
  lia.error("channel join => ", e);
});


send.handle("input", (e) => {
    chan.push("lia", {event_id: "@1", message: {input: e}})
})
send.handle("stop",  (e) => {
    chan.push("lia", {event_id: "@1", message: {stop: ""}})
});


"LIA: wait"
</script>


@end
-->