1// Copyright 2014 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package deptools
16
17import (
18	"fmt"
19	"os"
20	"strings"
21)
22
23var (
24	pathEscaper = strings.NewReplacer(
25		`\`, `\\`,
26		` `, `\ `,
27		`#`, `\#`,
28		`*`, `\*`,
29		`[`, `\[`,
30		`|`, `\|`)
31)
32
33// WriteDepFile creates a new gcc-style depfile and populates it with content
34// indicating that target depends on deps.
35func WriteDepFile(filename, target string, deps []string) error {
36	f, err := os.Create(filename)
37	if err != nil {
38		return err
39	}
40	defer f.Close()
41
42	var escapedDeps []string
43
44	for _, dep := range deps {
45		escapedDeps = append(escapedDeps, pathEscaper.Replace(dep))
46	}
47
48	_, err = fmt.Fprintf(f, "%s: \\\n %s\n", target,
49		strings.Join(escapedDeps, " \\\n "))
50	if err != nil {
51		return err
52	}
53
54	return nil
55}
56