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srcutil.go
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srcutil.go
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// Copyright 2019 Google LLC
//
// 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.
// Package srcutil provides utilities for working with files under go module.
package srcutil
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/golang/protobuf/jsonpb" /* copybara-comment */
"github.com/golang/protobuf/proto" /* copybara-comment */
)
// Path returns the path to a file in the repo given its relative path to
// the root of the module.
func Path(path string) string {
if strings.HasPrefix(path, "/") {
return path
}
return filepath.Join(ProjectRoot, path)
}
// Read reads a file in the repo given its relative path to the root of module.
func Read(path string) ([]byte, error) {
b, err := ioutil.ReadFile(Path(path))
if err != nil {
return nil, err
}
return b, nil
}
// LoadFile reads a file in the repo given its relative path to the root of module and returns a string.
func LoadFile(path string) (string, error) {
b, err := Read(path)
if err != nil {
return "", err
}
return string(b), err
}
// LoadProto reads a JSON proto message from a file.
func LoadProto(path string, msg proto.Message) error {
file, err := os.Open(Path(path))
if err != nil {
return fmt.Errorf("file %q I/O error: %v", path, err)
}
defer file.Close()
if err := jsonpb.Unmarshal(file, msg); err != nil && err != io.EOF {
return fmt.Errorf("file %q invalid JSON: %v", path, err)
}
return nil
}