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annotate cmd/sievemgr/edit.go @ 11:29769b9e2f09

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Switch to golang.org/x/term module Switch from golang.org/x/crypto/ssh/terminal to the new golang.org/x/term module.
author Guido Berhoerster <guido+sievemgr@berhoerster.name>
date Sat, 12 Dec 2020 20:44:35 +0100
parents 8caacf702c0d
children fc5e6970a0d5
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8
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1 // Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name>
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2 //
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3 // Permission is hereby granted, free of charge, to any person obtaining
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4 // a copy of this software and associated documentation files (the
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5 // "Software"), to deal in the Software without restriction, including
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6 // without limitation the rights to use, copy, modify, merge, publish,
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7 // distribute, sublicense, and/or sell copies of the Software, and to
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8 // permit persons to whom the Software is furnished to do so, subject to
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9 // the following conditions:
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10 //
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11 // The above copyright notice and this permission notice shall be included
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12 // in all copies or substantial portions of the Software.
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13 //
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14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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17 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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18 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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19 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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20 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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21
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22 package main
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23
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24 import (
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25 "fmt"
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26 "io"
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27 "io/ioutil"
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28 "os"
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29 "os/exec"
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30 "path/filepath"
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31 "runtime"
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32 "strings"
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33
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34 "go.guido-berhoerster.org/managesieve"
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35 "go.guido-berhoerster.org/sievemgr/cmd/sievemgr/internal/config"
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36 "golang.org/x/term"
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37 )
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38
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39 func init() {
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40 cmdEdit.Flag.StringVar(&acctName, "a", "", "Select the account")
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41 }
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42
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43 var cmdEdit = &command{
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44 UsageLine: "edit [options] name",
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45 Run: runEdit,
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46 }
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47
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48 func promptYesNo(prompt string) (yesNo bool, err error) {
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49 var tty *os.File
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50 var r io.Reader
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51 var w io.Writer
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52 if runtime.GOOS == "windows" {
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53 r = os.Stdin
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54 w = os.Stdout
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55 } else {
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56 tty, err = os.OpenFile("/dev/tty", os.O_RDWR, 0666)
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57 if err != nil {
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58 return
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59 }
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60 r = tty
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61 w = tty
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62 defer tty.Close()
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63 }
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64
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65 for {
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66 io.WriteString(w, prompt)
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67
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68 var response string
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69 _, err = fmt.Fscanln(r, &response)
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70 if err != nil {
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71 err = fmt.Errorf("failed to read response: %s", err)
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72 return
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73 }
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74
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75 switch strings.ToLower(response) {
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76 case "y", "yes":
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77 yesNo = true
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78 return
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79 case "n", "no":
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80 return
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81 }
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82 }
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83 }
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84
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85 func getScript(acct *config.Account, scriptName string) (string, error) {
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86 c, err := dialPlainAuth(acct)
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87 if err != nil {
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88 return "", err
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89 }
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90 defer c.Logout()
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91
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92 return c.GetScript(scriptName)
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93 }
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94
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95 func readScript(filename string) (string, error) {
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96 f, err := os.Open(filename)
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97 if err != nil {
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98 return "", err
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99 }
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100 defer f.Close()
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101
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102 return readLimitedString(f, managesieve.ReadLimit)
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103 }
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104
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105 func putScript(acct *config.Account, scriptName, script string) (string, error) {
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106 c, err := dialPlainAuth(acct)
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107 if err != nil {
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108 return "", err
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109 }
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110 defer c.Logout()
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111
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112 return c.PutScript(scriptName, script)
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113 }
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114
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115 func runEdit(cmd *command, args []string) error {
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116 if len(args) != 1 {
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117 return usageError("invalid number of arguments")
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118 }
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119
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120 scriptName := args[0]
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121
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122 if !term.IsTerminal(int(os.Stdin.Fd())) ||
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123 !term.IsTerminal(int(os.Stdout.Fd())) {
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124 return fmt.Errorf("the edit subcommand can only be used interactively\n")
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125 }
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126
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127 editor := os.Getenv("EDITOR")
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128 if editor == "" {
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129 return fmt.Errorf("EDITOR environment variable not set")
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130 }
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131
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132 acct, err := getAccount(&conf, acctName)
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133 if err != nil {
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134 return err
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135 }
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136
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137 if err := lookupHostPort(acct); err != nil {
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138 return err
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139 }
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140
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141 if err := readPassword(acct); err != nil {
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142 return err
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143 }
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144
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145 c, err := dialPlainAuth(acct)
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146 if err != nil {
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147 return err
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148 }
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149 defer c.Logout()
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150
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151 script, err := getScript(acct, scriptName)
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152 if err != nil {
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153 return err
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154 }
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155
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156 tmpDir, err := ioutil.TempDir(os.TempDir(), "sievemgr*")
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157 if err != nil {
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158 return fmt.Errorf("failed to create temporary directory: %s", err)
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159 }
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160
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161 tmpFile := filepath.Join(tmpDir, scriptName)
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162 if err = ioutil.WriteFile(tmpFile, []byte(script), 0640); err != nil {
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163 return fmt.Errorf("failed to create script file: %s", err)
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164 }
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165 defer func() {
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166 // show filename if an error has occured and the file is
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167 // preserved
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168 if tmpFile != "" {
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169 fmt.Fprintf(os.Stderr,
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170 "the script has been preserved as %s\n",
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171 tmpFile)
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172 }
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173 }()
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174
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175 // modification time is used to detect changes
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176 info, err := os.Stat(tmpFile)
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177 if err != nil {
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178 return fmt.Errorf("failed to stat file: %s", err)
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179 }
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180 origModTime := info.ModTime()
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181
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182 for {
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183 cmd := exec.Command(editor, tmpFile)
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184 cmd.Stdin = os.Stdin
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185 cmd.Stdout = os.Stdout
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186 cmd.Stderr = os.Stderr
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187 if err := cmd.Run(); err != nil {
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188 return fmt.Errorf("failed to run editor: %s", err)
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189 }
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190
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191 // quit if the script has not been changed
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diff changeset
192 if info, err := os.Stat(tmpFile); err != nil {
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193 return fmt.Errorf("failed to stat file: %s", err)
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194 } else if info.ModTime() == origModTime {
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parents:
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195 fmt.Fprintln(os.Stderr, "aborting, script was not modified")
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diff changeset
196 break
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197 }
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198
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199 script, err = readScript(tmpFile)
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diff changeset
200 if err != nil {
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parents:
diff changeset
201 return fmt.Errorf("failed to read script: %s", err)
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parents:
diff changeset
202 }
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parents:
diff changeset
203
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parents:
diff changeset
204 warnings, err := putScript(acct, scriptName, script)
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parents:
diff changeset
205 if err != nil {
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parents:
diff changeset
206 // show error and try again if the script was rejected
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parents:
diff changeset
207 // by the server
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parents:
diff changeset
208 fmt.Fprintln(os.Stderr, err)
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parents:
diff changeset
209 yesNo, err := promptYesNo("edit again [y/n]? ")
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parents:
diff changeset
210 if err != nil {
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parents:
diff changeset
211 return err
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parents:
diff changeset
212 } else if !yesNo {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
213 return fmt.Errorf("script not saved")
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
214 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
215 } else if warnings != "" {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
216 fmt.Fprintln(os.Stderr, warnings)
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parents:
diff changeset
217 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
218 } else {
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
219 break
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
220 }
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
221 }
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
222
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
223 os.RemoveAll(tmpDir)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
224 tmpFile = ""
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
225
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
226 return nil
8caacf702c0d Add edit subcommand for interactive editing of a script
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
227 }