cargo-sync-rdme 0.8.0

Cargo subcommand to synchronize README with crate documentation
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#!/usr/bin/env bash

set -euo pipefail

cargo_metadata="$(cargo metadata --no-deps --format-version 1)"
workspace_root="$(jq -cr '.workspace_root' <<<"${cargo_metadata}")"
root_package_manifest_path="${workspace_root}/Cargo.toml"
root_package_id="$(jq -r --arg path "${root_package_manifest_path}" '.packages[] | select(.manifest_path == $path) | .id' <<<"${cargo_metadata}")"

if [[ -z "${root_package_id}" ]]; then
    echo "error: could not find root package for workspace: ${workspace_root}" >&2
    exit 1
fi

root_package="$(jq -c --arg pkgid "${root_package_id}" '.packages[] | select(.id == $pkgid)' <<<"${cargo_metadata}")"

# For debugging
jq -c '{ root_package: { name: .name, rust_version: .rust_version } }' <<<"${root_package}" >&2

msrv="$(jq -r '.rust_version' <<<"${root_package}")"
if [[ "${msrv}" == "null" ]]; then
    echo "error: rust-version field is not set in root package manifest: ${root_package_manifest_path}" >&2
    exit 1
fi

echo "${msrv}"