#!/bin/sh
set -e

pg_short_version=pg"`pg_config --version | cut -d' ' -f2 | tr -d . | cut -c-2`"
output=src/"$pg_short_version".rs

case "${1:-}" in
  --select-pg) echo "$pg_short_version" ; exit 0 ;;
esac

if ! which bindgen 2>/dev/null 1>/dev/null
then
  echo 'Please install `bindgen` for Rust (`cargo install bindgen`)' >&2
  echo 'and ensure it is on the PATH.' >&2
  exit 2
fi

# Bindgen doesn't work on OS X without this.
xcode='/Applications/Xcode.app'
xcode_libs='Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/'
if [ -d "$xcode" ]
then
  export DYLD_LIBRARY_PATH="$xcode/$xcode_libs":"$DYLD_LIBRARY_PATH"
fi

echo "Generating $output" >&2

mkdir -p tmp/

cat > tmp/pgheaders.h <<\EOF
#include <stdarg.h>
#include "postgres.h"
#include "fmgr.h"
#include "utils/builtins.h"
#include "utils/json.h"
#include "utils/lsyscache.h"
#include "replication/output_plugin.h"
#include "replication/logical.h"
EOF

gcc -I "`pg_config --includedir-server`" -E tmp/pgheaders.h > tmp/pgexpanded.h

bindgen -allow-bitfields -builtins tmp/pgexpanded.h > "$output"