environment.sh

#!/bin/bash

# Environment
export PROJECT_ROOT=$PWD
export PROJECT_NAME=xjax

export VERSION=${VERSION:-0.1-dev}
export PY_VERSION=$(echo $VERSION | sed 's/-/\.dev0+/')

# Detect the platform
platform=$(uname)
if [[ "$platform" == "Linux" ]]; then
  export PLATFORM="linux"
elif [[ "$platform" == "Darwin" ]]; then
  export PLATFORM="macos"
else
    echo "Unsupported platform: $platform"
    exit 1
fi

# Set mtimes to timestamp of latest commit if project has git repo
if [[ -d .git ]]; then
  export SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
else
  unset SOURCE_DATE_EPOCH
fi

# Export variables to temporary project.env
tmp_project_env=$(mktemp)
project_variables=(
  PROJECT_ROOT
  PROJECT_NAME
  PLATFORM
  VERSION
  PY_VERSION
  SOURCE_DATE_EPOCH
)

for v in "${project_variables[@]}"; do
  eval "echo \"$v=\$$v\"" >> "$tmp_project_env"
done

# Only update project.env if they're different.
#   Note: Prevents parallel make processes from stepping on each other.

if [[ ! -f project.env ]] || ! cmp -s project.env $tmp_project_env; then
  echo "Updating project.env"
  mv $tmp_project_env project.env
fi