#!/bin/bash

# We can rewrite this bash script in Go if a dependency on bash and coreutils
# is a problem during development.

go_version=$(go env GOVERSION) # not "go version", to exclude GOOS/GOARCH

runtime_and_deps=$(go list -deps runtime)

# All packages that the runtime linknames to, except runtime and its dependencies.
# This resulting list is what we need to "go list" when obfuscating the runtime,
# as they are the packages that we may be missing.
runtime_linknamed=$(comm -23 <(
	sed -rn 's@//go:linkname .* ([^.]*)\.[^.]*@\1@p' $(go env GOROOT)/src/runtime/*.go | grep -vE '^main|^runtime\.' | sort -u
) <(
	# Note that we assume this is constant across platforms.
	go list -deps runtime | sort -u
))

gofmt >go_std_tables.go <<EOF
// Code generated by scripts/gen-go-std-tables.sh; DO NOT EDIT.

// Generated from Go version ${go_version}.

package main

var runtimeAndDeps = map[string]bool{
$(for path in ${runtime_and_deps}; do
	echo "\"${path}\": true,"
done)
}

var runtimeLinknamed = []string{
$(for path in ${runtime_linknamed}; do
	echo "\"${path}\"",
done)
}
EOF