// Copyright 2016 The TensorFlow Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:generate sh generate.sh

// Command genop generates a Go source file with functions for TensorFlow ops.
package main

import (
	"bytes"
	"flag"
	"go/format"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"

	"github.com/tensorflow/tensorflow/tensorflow/go/genop/internal"
)

func main() {
	var (
		filename = flag.String("outfile", "", "File to write generated source code to.")
		header   = flag.String("header", "", "Path to a file whose contents will be copied into the generated file. Can be empty")
		buf      bytes.Buffer
	)
	flag.Parse()
	if *filename == "" {
		log.Fatal("-outfile must be set")
	}
	if *header != "" {
		hdr, err := ioutil.ReadFile(*header)
		if err != nil {
			log.Fatalf("Unable to read %s: %v", *header, err)
		}
		buf.Write(hdr)
		buf.WriteString("\n\n")
	}
	os.MkdirAll(filepath.Dir(*filename), 0755)

	if err := internal.GenerateFunctionsForRegisteredOps(&buf); err != nil {
		log.Fatal(err)
	}
	formatted, err := format.Source(buf.Bytes())
	if err != nil {
		log.Fatalf("Failed to generate valid source? 'go fmt' failed: %v", err)
	}
	if err := ioutil.WriteFile(*filename, formatted, 0644); err != nil {
		log.Fatalf("Failed to write to %q: %v", *filename, err)
	}
}
