Run MadGraph5_aMC@NLO.

run-mg5_aMC.sh

#!/bin/bash
#
# @file run-mg5_aMC.sh
#
# Runs MadGraph5_aMC@NLO. This script downloads and
# sets up MadGraph5_aMC@NLO if needed.
#
set -eu
set -o pipefail

PYTHON=python3
CURL=curl
MG5_AMC_VERSION=3.4.2
VENV_DIR=.venv

cd "$(dirname "$0")"

if [ ! -d $VENV_DIR ]; then
  $PYTHON -m venv $VENV_DIR
  $VENV_DIR/bin/pip3 install six ipykernel matplotlib
fi

if [ ! -d "MG5_aMC_v$(echo $MG5_AMC_VERSION | tr . _)" ]; then
  $CURL -OL https://launchpad.net/mg5amcnlo/3.0/3.4.x/+download/MG5_aMC_v$MG5_AMC_VERSION.tar.gz
  tar -xf MG5_aMC_v$MG5_AMC_VERSION.tar.gz
  rm MG5_aMC_v$MG5_AMC_VERSION.tar.gz
fi

PATH=$(pwd)/$VENV_DIR/bin:$PATH
export PATH
$VENV_DIR/bin/python3 "./MG5_aMC_v$(echo $MG5_AMC_VERSION | tr . _)/bin/mg5_aMC" "$@"