Emscipten Homebrew Formula Update Helper Script

emscripten-revisions.sh

#!/usr/bin/env bash
# Helper script for fetching the required Binaryen and LLVM revisions for the current release of Emscripten in Homebrew/core.
# TODO:
#   - print output in a machine-readable format (e.g. JSON)
#   - remove dependency on `rg`
#   - automate updating `emscripten.rb`

REQUIRED_COMMANDS=(jq curl brew base64 rg python3)
for prog in "${REQUIRED_COMMANDS[@]}"; do
	if ! command -v "${prog}" &>/dev/null; then
		echo "Error: ${prog} not found. Please install it before using ${0}" >&2
		exit 1
	fi
done

RELEASE_TAGS_URL=https://raw.githubusercontent.com/emscripten-core/emsdk/main/emscripten-releases-tags.json

JQ=(jq --raw-output)
CURL=(curl --fail --silent --show-error --location)

EMSCRIPTEN_VERSION="$(brew info --json=v2 emscripten | "${JQ[@]}" '.formulae[].versions.stable')"
RELEASE_TAGS_JSON="$("${CURL[@]}" "${RELEASE_TAGS_URL}")"
GOOGLESOURCE_COMMIT_HASH="$("${JQ[@]}" --arg version "${EMSCRIPTEN_VERSION}" ".releases[\$version]" <<<"${RELEASE_TAGS_JSON}")"
GOOGLESOURCE_URL="https://chromium.googlesource.com/emscripten-releases/+/${GOOGLESOURCE_COMMIT_HASH}/DEPS?format=TEXT"
GOOGLESOURCE_DATA="$("${CURL[@]}" "${GOOGLESOURCE_URL}" | base64 --decode | rg --multiline 'vars = \{[^}]+\}')"

echo "Emscripten version: ${EMSCRIPTEN_VERSION}"
python3 <<PYTHON
${GOOGLESOURCE_DATA}
print('Binaryen Revision:', vars['binaryen_revision'])
print('LLVM Revision:', vars['llvm_project_revision'])
PYTHON