add new executors

docker/Dockerfile

@@ -1,13 +1,22 @@
 FROM ubuntu:18.04
 
+RUN sed -i 's/http:\/\/archive.ubuntu.com\/ubuntu\//http:\/\/mirror.math.princeton.edu\/pub\/ubuntu\//' /etc/apt/sources.list
 RUN apt-get update
-RUN apt-get -y install bash-completion
+RUN echo "tzdata tzdata/Areas select America" > /tmp/tzseed.txt; \
+    echo "tzdata tzdata/Zones/America select Chicago" >> /tmp/tzseed.txt; \
+    debconf-set-selections /tmp/tzseed.txt && \
+    apt-get install -y tzdata && \
+    rm /tmp/tzseed.txt
+RUN apt-get -y install nano dpkg-dev
 RUN apt-get -y install build-essential
 RUN apt-get -y install python
 RUN apt-get -y install python3
 RUN apt-get -y install ruby
 RUN apt-get -y install nodejs
 RUN apt-get -y install golang
+RUN apt-get -y install php7.2
+RUN apt-get -y install r-base
+RUN apt-get -y install mono-complete
 
 RUN useradd -m runner
 

docker/execute

@@ -38,6 +38,15 @@ case "$lang" in
 "go")
     bin=executor_go
     ;;
+"c#" | "csharp" | "cs")
+    bin=executor_csharp
+    ;;
+"r")
+    bin=executor_r
+    ;;
+"php")
+    bin=executor_php
+    ;;
 *)
     echo "invalid language"
     exit
@@ -56,6 +65,9 @@ docker run \
     -v $dir/executors/c:/executor_c:ro \
     -v $dir/executors/cpp:/executor_cpp:ro \
     -v $dir/executors/go:/executor_go:ro \
+    -v $dir/executors/csharp:/executor_csharp:ro \
+    -v $dir/executors/r:/executor_r:ro \
+    -v $dir/executors/php:/executor_php:ro \
     piston \
     runuser \
         -l runner \

docker/executors/csharp

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+mcs $1 -out:binary
+timeout -s KILL 3 mono binary

docker/executors/php

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+timeout -s KILL 3 php $*

docker/executors/r

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+timeout -s KILL 3 Rscript $*

readme.md

@@ -13,7 +13,7 @@ from from EMKC contests and challenges. It's also used in the Engineer Man Disco
 - `docker/execute <lang> <path to file>`
 
 #### Supported Languages
-Currently python2, python3, c, c++, go, node, and ruby are supported.
+Currently python2, python3, c, c++, go, node, ruby, r, c#, and php are supported.
 
 #### Principle of Operation
 Piston utilizes Docker as the primary mechanism for sandboxing. There is a small API written in Go which takes