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// Copyright 2018 Google Inc. 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.
// This tool reads "make"-like dependency files, and outputs a canonical version
// that can be used by ninja. Ninja doesn't support multiple output files (even
// though it doesn't care what the output file is, or whether it matches what is
// expected).
package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"android/soong/makedeps"
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [-o <output>] <depfile.d> [<depfile.d>...]", os.Args[0])
flag.PrintDefaults()
}
output := flag.String("o", "", "Optional output file (defaults to rewriting source if necessary)")
flag.Parse()
if flag.NArg() < 1 {
log.Fatal("Expected at least one input file as an argument")
}
var mergedDeps *makedeps.Deps
var firstInput []byte
for i, arg := range flag.Args() {
input, err := ioutil.ReadFile(arg)
if err != nil {
log.Fatalf("Error opening %q: %v", arg, err)
}
deps, err := makedeps.Parse(arg, bytes.NewBuffer(append([]byte(nil), input...)))
if err != nil {
log.Fatalf("Failed to parse: %v", err)
}
if i == 0 {
mergedDeps = deps
firstInput = input
} else {
mergedDeps.Inputs = append(mergedDeps.Inputs, deps.Inputs...)
}
}
new := mergedDeps.Print()
if *output == "" || *output == flag.Arg(0) {
if !bytes.Equal(firstInput, new) {
err := ioutil.WriteFile(flag.Arg(0), new, 0666)
if err != nil {
log.Fatalf("Failed to write: %v", err)
}
}
} else {
err := ioutil.WriteFile(*output, new, 0666)
if err != nil {
log.Fatalf("Failed to write to %q: %v", *output, err)
}
}
}
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