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// Copyright 2020 Google LLC 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.
// Package editor implements a simple interface for interactive file editing.
// It most likely does not work on windows.
package editor
import (
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
)
// Edit opens a temporary file in the default editor (per $EDITOR, falling back
// to "vi") with the contents of the given io.Reader and a filename ending in
// the given extension (to give a hint to the editor for syntax highlighting).
//
// The contents of the edited file are returned, and the temporary file removed.
func Edit(input io.Reader, extension string) ([]byte, error) {
f, err := os.CreateTemp("", fmt.Sprintf("%s-edit.*.%s", filepath.Base(os.Args[0]), extension))
if err != nil {
return nil, err
}
defer os.Remove(f.Name())
if _, err := io.Copy(f, input); err != nil {
return nil, err
}
f.Close()
editor := "vi"
if env := os.Getenv("EDITOR"); env != "" {
editor = env
}
path, err := exec.LookPath(editor)
if err != nil {
return nil, err
}
cmd := exec.Command(path, f.Name())
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return nil, err
}
return os.ReadFile(f.Name())
}
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