add prolog language support (#82)

* add prolog language support

config/languages.json

@@ -199,6 +199,13 @@
             "php5"
         ]
     },
+    {
+        "name": "prolog",
+        "aliases": [
+            "prolog",
+            "plg"
+        ]
+    },
     {
         "name": "python3",
         "aliases": [

container/install_script.sh

@@ -283,6 +283,22 @@ MIX_ENV=prod mix escript.build --force
 echo 'export PATH=$PATH:/opt/05AB1E/05AB1E' >> /opt/.profile
 source /opt/.profile
 
+
+# install prolog
+# final binary: /opt/swipl/swipl-<version>/build/src/swipl
+cd /opt && mkdir swipl && cd swipl
+SUB_DIR=swipl-8.2.4
+wget https://www.swi-prolog.org/download/stable/src/$SUB_DIR.tar.gz
+tar -xf $SUB_DIR.tar.gz
+rm $SUB_DIR.tar.gz
+cd $SUB_DIR
+mkdir build
+cd build
+cmake -DSWIPL_PACKAGES_JAVA=OFF -DSWIPL_PACKAGES_X=OFF -DMULTI_THREADED=OFF -G Ninja ..
+ninja
+echo "export PATH=\$PATH:/opt/swipl/$SUB_DIR/build/src" >> /opt/.profile
+source /opt/.profile
+
 # create runnable users and apply limits
 for i in {1..150}; do
     useradd -M runner$i

lxc/executors/prolog

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+cd /tmp/$1
+
+sed 's/^.*$/:- forall((Goal = (\0), call(Goal)), (write(Goal), nl))./' input.input |
+	cat code.code - > code.pl
+
+timeout -s KILL 3 swipl -g true -t halt code.pl
+

lxc/tests/_run

@@ -52,6 +52,8 @@ echo -n 'testing perl = '
 ../../cli/execute perl perl.pl
 echo -n 'testing php = '
 ../../cli/execute php php.php
+echo -n 'testing prolog = '
+../../cli/execute prolog prolog.pl
 echo -n 'testing python2 = '
 ../../cli/execute python2 python2.py
 echo -n 'testing python3 = '

lxc/tests/prolog.pl

@@ -0,0 +1 @@
+:- write('good'), nl.

lxc/util/versions

@@ -105,6 +105,10 @@ echo 'php'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "php -v"
 echo '---'
 
+echo 'prolog'
+lxc-attach --clear-env -n piston -- /bin/bash -l -c "swipl --version"
+echo '---'
+
 echo 'python2'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "python -V"
 echo '---'