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16
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1 /*
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2 little unix tool library.
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3 */
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4 package lu
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5
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6 import (
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7 "archive/tar"
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8 "bufio"
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9 "bytes"
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10 "compress/gzip"
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11 "crypto/md5"
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12 "crypto/sha256"
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13 "fmt"
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14 "io"
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15 "log"
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16 "os"
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17 "os/exec"
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18 "path/filepath"
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18
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19 "regexp"
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16
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20 "strings"
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21 )
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22
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23 func CmdTime( cmdline string ) {
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24 cmd := exec.Command( "ls", "-l" )
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25 cmd.Stdin = strings.NewReader( "some input" )
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26 var out bytes.Buffer
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27 cmd.Stdout = &out
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28 err := cmd.Run()
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29 if err != nil {
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30 log.Fatal( err )
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31 }
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32 fmt.Printf( "%q\n", out.String() )
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33 }
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34
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35 /* cut -d, -f: */
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36 func CutCsv( files []string, cols []string ) {
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37 }
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38
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39 /* cat -n: done. */
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40 func Cat_n( files []string ) {
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41 if len( files ) == 0 {
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42 cnt := 1
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43 input := bufio.NewScanner( os.Stdin )
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44 for input.Scan() {
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45 fmt.Printf( "%5d %s\n", cnt, input.Text() )
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46 cnt++
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47 }
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48 } else {
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49 for _, file := range files {
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50 cnt := 1
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51 f, _ := os.Open( file )
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52 input := bufio.NewScanner( f )
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53 for input.Scan() {
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54 fmt.Printf( "%5d %s\n", cnt, input.Text() )
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55 cnt++
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56 }
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57 f.Close()
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58 }
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59 }
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60 }
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61
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62 /* wc -l: done. */
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63 func Wc_l( files []string ) {
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64 if len( files ) == 0 {
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65 cnt := 0
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66 input := bufio.NewScanner( os.Stdin )
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67 for input.Scan() {
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68 cnt++
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69 }
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70 fmt.Printf( "%d\n", cnt )
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71 } else {
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72 for _, file := range files {
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73 cnt := 0
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74 f, _ := os.Open( file )
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75 input := bufio.NewScanner( f )
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76 for input.Scan() {
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77 cnt++
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78 }
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79 f.Close()
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80 fmt.Printf( "%s:\t%5d\n", file, cnt )
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81 }
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82 }
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83 }
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84
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17
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85 /* tar cvfz: done. */
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86 func Tgz( tgzfile string, files []string ) {
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87
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88 tgz, err := os.Create( tgzfile )
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89 if err != nil {
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90 log.Fatal( err )
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91 }
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92 defer tgz.Close()
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93
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94 gw := gzip.NewWriter( tgz )
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95 defer gw.Close()
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96 tw := tar.NewWriter( gw )
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97 defer tw.Close()
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98
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99 for _, file := range fullpath( files ) {
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100 f, err := os.Open( file )
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101 if err != nil {
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102 log.Fatal( err )
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103 }
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104
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105 stat, _ := f.Stat()
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106 header := new( tar.Header )
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107 header.Name = file
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108 header.Size = stat.Size()
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109 header.Mode = int64( stat.Mode() )
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110 header.ModTime = stat.ModTime()
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111
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112 if err := tw.WriteHeader( header ); err != nil {
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113 log.Fatal( err )
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114 }
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115 if _, err := io.Copy( tw, f ); err != nil {
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116 log.Fatal( err )
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117 }
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118 f.Close()
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119 }
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120 }
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121
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16
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122 /* tar xvfz: done. */
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123 func UnTgz( files []string ) {
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124
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125 for _, file := range files {
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126
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127 f, err := os.Open( file )
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128 if err != nil {
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129 log.Fatal( err )
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130 }
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131 zr, err := gzip.NewReader( f )
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132 if err != nil {
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133 log.Fatal( err )
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134 }
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135
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136 tr := tar.NewReader( zr )
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137
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138 for {
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139 hdr, err := tr.Next()
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140 if err == io.EOF {
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141 break // End of archive
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142 }
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143 if err != nil {
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144 log.Fatal( err )
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145 }
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146 fmt.Printf( "%s\n", hdr.Name )
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147
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148 dir := filepath.Dir( hdr.Name )
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149 if ( dir != "" ) {
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150 os.MkdirAll( dir, 0744 )
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151 }
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152 f, err := os.OpenFile( hdr.Name, os.O_RDWR|os.O_CREATE, 0644 )
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153 if err != nil {
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154 log.Fatal( err )
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155 }
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156 if _, err := io.Copy( f, tr ); err != nil {
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157 log.Fatal( err )
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158 }
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159
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160 if err := f.Close(); err != nil {
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161 log.Fatal( err )
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162 }
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163 }
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164
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165 if err := zr.Close(); err != nil {
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166 log.Fatal( err )
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167 }
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168 }
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17
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169 }
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16
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170
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17
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171 func fullpath( files []string ) []string {
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172 var buf []string
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173 for _, f := range files {
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174 fi, _ := os.Stat( f )
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175 if fi.IsDir() {
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176 filepath.Walk( f, func( path string, info os.FileInfo, err error ) error {
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177 if !info.IsDir() {
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178 buf = append( buf, path )
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179 }
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180 return nil
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181 } )
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182 } else {
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183 buf = append( buf, f )
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184 }
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185 }
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186 return buf
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16
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187 }
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188
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189 /* tac: done. */
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190 func Reverse( files []string ) {
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191 var buf []string
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192 if len( files ) == 0 {
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193 input := bufio.NewScanner( os.Stdin )
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194 for input.Scan() {
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195 buf = append( buf, input.Text() )
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196 }
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197 } else {
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198 for _, file := range files {
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199 f, _ := os.Open( file )
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200 input := bufio.NewScanner( f )
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201 for input.Scan() {
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202 buf = append( buf, input.Text() )
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203 }
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204 f.Close()
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205 }
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206 }
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207 for i := len( buf ); i > 0; i-- {
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208 fmt.Println( buf[i-1] )
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209 }
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210 }
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211
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18
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212 /* grep: done. */
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16
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213 func Grep( word string, inv bool, files []string ) {
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18
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214 regex, err := regexp.Compile( word )
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215 if err != nil {
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216 log.Fatal( err )
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217 }
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16
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218 if len( files ) == 0 {
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18
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219 grep( regex, inv, os.Stdin )
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220 } else {
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18
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221 for _, file := range files {
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222 f, _ := os.Open( file )
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223 grep( regex, inv, f )
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224 f.Close()
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225 }
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226 }
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227 }
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228
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229 func grep( regex *regexp.Regexp, inv bool, r io.Reader ) {
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230 input := bufio.NewScanner( r )
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231 for input.Scan() {
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232 if regex.MatchString( input.Text() ) && !inv {
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233 fmt.Println( input.Text() )
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234 }
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235 if !regex.MatchString( input.Text() ) && inv {
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236 fmt.Println( input.Text() )
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237 }
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238 }
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239 }
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240
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241 /* orgrep: done. */
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242 func OrGrep( lfile string, inv bool, files []string ) {
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243 var keywords []regexp.Regexp
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244 f, _ := os.Open( lfile )
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245 input := bufio.NewScanner( f )
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246 for input.Scan() {
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247 regex, err := regexp.Compile( input.Text() )
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248 if err != nil {
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249 log.Fatal( err )
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250 }
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251 keywords = append( keywords, *regex )
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252 }
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253 f.Close()
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254
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255 if len( files ) == 0 {
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256 orgrep( keywords, inv, os.Stdin )
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257 } else {
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258 for _, file := range files {
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259 f, _ := os.Open( file )
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260 orgrep( keywords, inv, f )
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261 f.Close()
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262 }
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263 }
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264 }
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265
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266 func orgrep( keywords []regexp.Regexp, inv bool, r io.Reader ) {
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267 input := bufio.NewScanner( r )
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268 seen := make( map[string]bool )
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269 for input.Scan() {
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270 for _, r := range keywords {
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271 if r.MatchString( input.Text() ) {
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272 seen[ input.Text() ] = true
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273 }
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274 }
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275 if !inv && seen[ input.Text() ] {
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276 fmt.Println( input.Text() )
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277 }
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278 if inv && !seen[ input.Text() ] {
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279 fmt.Println( input.Text() )
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280 }
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281 seen[ input.Text() ] = false
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16
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282 }
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283 }
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284
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285 /* uniq: done. */
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286 func Uniq( cnt, dup bool, files []string ) {
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287 var lines []string
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288 lcnt := make( map[string]int )
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289 lpnt := make( map[string]bool )
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290
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291 if len( files ) == 0 {
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292 input := bufio.NewScanner( os.Stdin )
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293 for input.Scan() {
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294 lines = append( lines, input.Text() )
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295 lcnt[ input.Text() ]++
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296 }
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297 } else {
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298 for _, file := range files {
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299 f, _ := os.Open( file )
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300 input := bufio.NewScanner( f )
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301 for input.Scan() {
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302 lines = append( lines, input.Text() )
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303 lcnt[ input.Text() ]++
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304 }
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305 f.Close()
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306 }
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307 }
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308
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309 for _, line := range lines {
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310 if !lpnt[ line ] {
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311 if dup && lcnt[ line ] == 1 {
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312 continue
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313 }
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314 if cnt {
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315 fmt.Printf( "%5d ,", lcnt[ line ] )
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316 }
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317 fmt.Printf( "%s\n", line )
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318 lpnt[ line ] = true
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319 }
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320 }
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321 }
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322
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323 func Head( n int, files []string ) {
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324 if n > 0 {
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325 if len( files ) == 0 {
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326 input := bufio.NewScanner( os.Stdin )
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327 for input.Scan() {
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328 fmt.Println( input.Text() )
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329 n--
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330 if n == 0 {
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331 return
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332 }
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333 }
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334 } else {
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335 for _, file := range files {
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336 if n == 0 {
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337 return
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338 }
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339 f, _ := os.Open( file )
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340 input := bufio.NewScanner( f )
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341 for input.Scan() {
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342 fmt.Println( input.Text() )
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343 n--
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344 if n == 0 {
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345 break
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346 }
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347 }
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348 f.Close()
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349 }
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350 }
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351 } else {
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352 if len( files ) == 0 {
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353
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354 } else {
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355
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356 }
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357 }
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358 }
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359
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21
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360 /* replace: done. */
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16
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361 func Replace( s, t string, files []string ) {
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362 if len( files ) == 0 {
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363 input := bufio.NewScanner( os.Stdin )
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364 for input.Scan() {
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21
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365 str := strings.Replace( input.Text(), s, t, -1 )
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366 fmt.Println( str )
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16
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367 }
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368 } else {
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369 for _, file := range files {
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370 f, _ := os.Open( file )
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371 input := bufio.NewScanner( f )
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372 for input.Scan() {
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21
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373 str := strings.Replace( input.Text(), s, t, -1 )
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374 fmt.Println( str )
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16
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375 }
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376 f.Close()
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377 }
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378 }
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379 }
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380
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381 /* touch: */
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382 func Touch( files []string ) {
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383 for _, file := range files {
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384 f, _ := os.Open( file )
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385 f.Close()
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386 }
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387 }
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388
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389 /* md5: done. */
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390 func Md5( files []string ) {
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391 for _, file := range files {
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392 f, _ := os.Open( file )
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393 h := md5.New()
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394 if _, err := io.Copy( h, f ); err != nil {
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395 log.Fatal( err )
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396 }
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397 f.Close()
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398 if len( files ) == 1 {
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399 fmt.Printf( "%x\n", h.Sum( nil ) )
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400 } else {
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401 fmt.Printf( "%s:\t%x\n", file, h.Sum( nil ) )
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402 }
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403 }
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404 }
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405
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406 /* sha256: done. */
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407 func Sha256( files []string ) {
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408 for _, file := range files {
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409 f, _ := os.Open( file )
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410 h := sha256.New()
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411 if _, err := io.Copy( h, f ); err != nil {
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412 log.Fatal( err )
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413 }
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414 f.Close()
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415 if len( files ) == 1 {
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416 fmt.Printf( "%x\n", h.Sum( nil ) )
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417 } else {
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418 fmt.Printf( "%s:\t%x\n", file, h.Sum( nil ) )
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419 }
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420 }
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421 }
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422
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19
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423 /* tee: done. */
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424 func Tee( file string ) {
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425 if _, err := os.Stat( file ); !os.IsNotExist( err ) {
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426 if err := os.Remove( file ); err != nil {
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427 log.Fatal( err )
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428 }
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429 }
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430 f, err := os.OpenFile( file, os.O_RDWR|os.O_CREATE, 0644 )
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431 if err != nil {
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432 log.Fatal( err )
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433 }
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434 defer f.Close()
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435
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436 w := io.MultiWriter( f, os.Stdout )
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437 if _, err := io.Copy( w, os.Stdin ); err != nil {
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438 log.Fatal( err )
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439 }
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440 }
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441
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