68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This tool reads "make"-like dependency files, and outputs a canonical version
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// that can be used by ninja. Ninja doesn't support multiple output files (even
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// though it doesn't care what the output file is, or whether it matches what is
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// expected).
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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)
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func main() {
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flag.Usage = func() {
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fmt.Fprintf(os.Stderr, "Usage: %s <depfile.d>", os.Args[0])
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flag.PrintDefaults()
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}
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output := flag.String("o", "", "Optional output file (defaults to rewriting source if necessary)")
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flag.Parse()
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if flag.NArg() != 1 {
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log.Fatal("Expected a single file as an argument")
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}
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old, err := ioutil.ReadFile(flag.Arg(0))
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if err != nil {
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log.Fatalf("Error opening %q: %v", flag.Arg(0), err)
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}
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deps, err := Parse(flag.Arg(0), bytes.NewBuffer(append([]byte(nil), old...)))
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if err != nil {
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log.Fatalf("Failed to parse: %v", err)
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}
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new := deps.Print()
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if *output == "" || *output == flag.Arg(0) {
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if !bytes.Equal(old, new) {
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err := ioutil.WriteFile(flag.Arg(0), new, 0666)
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if err != nil {
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log.Fatalf("Failed to write: %v", err)
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}
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}
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} else {
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err := ioutil.WriteFile(*output, new, 0666)
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if err != nil {
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log.Fatalf("Failed to write to %q: %v", *output, err)
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}
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}
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}
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