Actually add sandbox plugin

sandbox/sandbox.plugin.zsh

@@ -0,0 +1,103 @@
+if [[ "" == $SANDBOX_ENV_IN_FILE ]]; then
+  export SANDBOX_ENV_IN_FILE=$AUTOENV_IN_FILE
+fi
+if [[ "" == $SANDBOX_ENV_OUT_FILE ]]; then
+  export SANDBOX_ENV_OUT_FILE=$AUTOENV_OUT_FILE
+fi
+if [[ "" == $SANDBOX_ROOT ]]; then
+  export SANDBOX_ROOT=$HOME/Sandbox
+fi
+
+sandbox() {
+  local usage="usage: sandbox {create,destroy,enable,disable} [name]"
+
+  if [[ "" == $1 ]]; then
+    echo $usage
+    return 1
+  fi
+
+  case $1 in
+    create)
+      if [[ "" == $2 ]]; then
+        echo $usage
+        return 1
+      fi
+
+      local sandbox=$SANDBOX_ROOT/$2
+      if [[ -d $sandbox ]]; then
+        echo "Sandbox '$2' already exists"
+        return 2
+      fi
+
+      mkdir -p $sandbox &> /dev/null
+      begin=$PWD
+      cd $sandbox
+
+      echo "SANDBOX_HOME=\$(dirname -- "\$0:a")" >> $SANDBOX_ENV_IN_FILE
+      echo "SANDBOX_NAME=$2" >> $SANDBOX_ENV_IN_FILE
+
+      echo "unset SANDBOX_NAME" >> $SANDBOX_ENV_OUT_FILE
+      echo "unset SANDBOX_HOME" >> $SANDBOX_ENV_OUT_FILE
+
+      git init &> /dev/null
+
+      cd $begin
+      cd $sandbox
+      ;;
+    rename)
+      if [[ "" == $2 || "" == $3 ]]; then
+        echo $usage
+        return 1
+      fi
+
+      mv $SANDBOX_ROOT/$2 $SANDBOX_ROOT/$3
+      sed -i "" "s/$2/$3/g" $SANDBOX_ROOT/$3/.env
+      ;;
+    destroy)
+      if [[ "" == $2 ]]; then
+        echo $usage
+        return 1
+      fi
+
+      local sandbox=$SANDBOX_ROOT/$2
+      if [[ ! -d $sandbox ]]; then
+        echo "Sandbox '$2' does not exist"
+        return 2
+      fi
+
+      cd -
+      if [[ "${SANDBOX_ROOT##$PWD}" = "${SANDBOX_ROOT}" ]]; then
+        cd $HOME
+      fi
+
+      rm -rf $sandbox
+      ;;
+    list)
+      /bin/ls -1 $SANDBOX_ROOT
+      ;;
+    enable)
+      if [[ "" == $2 ]]; then
+        echo $usage
+        return 1
+      fi
+
+      local sandbox=$SANDBOX_ROOT/$2
+      if [[ ! -d $sandbox ]]; then
+        echo "Sandbox '$2' does not exist"
+        return 2
+      fi
+
+      export SANDBOX_RETURN=$PWD
+      cd $sandbox
+      ;;
+    disable)
+      if [[ -z $SANDBOX_RETURN ]]; then
+        echo "Sandbox is not currently active"
+        return 2
+      fi
+
+      cd $SANDBOX_RETURN
+      unset $SANDBOX_RETURN
+      ;;
+  esac
+}