101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
// Copyright (c) 2014-2018, b3log.org & hacpai.com
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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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// https://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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package util
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import (
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"bytes"
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"errors"
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"os"
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"os/exec"
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"os/user"
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"path/filepath"
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"runtime"
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"strings"
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)
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type myos struct{}
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// OS utilities.
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var OS = myos{}
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// IsWindows determines whether current OS is Windows.
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func (*myos) IsWindows() bool {
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return "windows" == runtime.GOOS
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}
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// Pwd gets the path of current working directory.
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func (*myos) Pwd() string {
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file, _ := exec.LookPath(os.Args[0])
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pwd, _ := filepath.Abs(file)
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return filepath.Dir(pwd)
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}
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// Home returns the home directory for the executing user.
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//
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// This uses an OS-specific method for discovering the home directory.
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// An error is returned if a home directory cannot be detected.
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func (*myos) Home() (string, error) {
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user, err := user.Current()
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if nil == err {
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return user.HomeDir, nil
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}
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// cross compile support
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if OS.IsWindows() {
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return homeWindows()
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}
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// Unix-like system, so just assume Unix
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return homeUnix()
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}
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func homeUnix() (string, error) {
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// First prefer the HOME environmental variable
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if home := os.Getenv("HOME"); home != "" {
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return home, nil
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}
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// If that fails, try the shell
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var stdout bytes.Buffer
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cmd := exec.Command("sh", "-c", "eval echo ~$USER")
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cmd.Stdout = &stdout
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if err := cmd.Run(); err != nil {
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return "", err
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}
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result := strings.TrimSpace(stdout.String())
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if result == "" {
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return "", errors.New("blank output when reading home directory")
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}
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return result, nil
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}
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func homeWindows() (string, error) {
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drive := os.Getenv("HOMEDRIVE")
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path := os.Getenv("HOMEPATH")
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home := drive + path
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if drive == "" || path == "" {
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home = os.Getenv("USERPROFILE")
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}
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if home == "" {
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return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
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}
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return home, nil
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}
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