environment.sh

#!/usr/bin/env bash

# Set up PYTHONPATH and other needed environment variables
# This script will also source user_environment.sh where you can specify
# overrides if required for your system

if [ "$0" = "$_" ]; then
echo This script is intended to be invoked using \"source environment.sh\"
echo Calling it as a standalone script will have no effect.
exit 1
fi

SCRIPT_PATH=$(readlink -f "${BASH_SOURCE:-$0}")
SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
LIBTRELLIS_DIR="${SCRIPT_DIR}/libtrellis"
PYTHONLIBS_DIR="${SCRIPT_DIR}/util:${SCRIPT_DIR}/util/common:${SCRIPT_DIR}/util/fuzz:${SCRIPT_DIR}/timing/util:${SCRIPT_DIR}/util/common/nets"
export PYTHONPATH="${LIBTRELLIS_DIR}:${PYTHONLIBS_DIR}:${PYTHONPATH}"

USER_ENV="${SCRIPT_DIR}/user_environment.sh"

if [ ! -f "$USER_ENV" ]; then
cat > "${USER_ENV}" << EOT
#!/usr/bin/env bash
# This file allows you to set up custom settings that are applied when you
# run `source environment.sh`

# Changes to this file will be automatically ignored by Git

# export DIAMONDDIR=/usr/local/diamond/3.10_x64
# export DIAMONDDIR="$(realpath "$(dirname "$(realpath "$(which diamond)")")"/../diamond)"  # suitable for NixOS
EOT
fi

source "$USER_ENV"