1 | package File::Spec::Mac; |
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2 | |
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3 | use strict; |
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4 | use vars qw(@ISA $VERSION); |
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5 | require File::Spec::Unix; |
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6 | |
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7 | $VERSION = '1.2'; |
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8 | |
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9 | @ISA = qw(File::Spec::Unix); |
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10 | |
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11 | =head1 NAME |
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12 | |
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13 | File::Spec::Mac - File::Spec for MacOS |
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14 | |
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15 | =head1 SYNOPSIS |
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16 | |
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17 | require File::Spec::Mac; # Done internally by File::Spec if needed |
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18 | |
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19 | =head1 DESCRIPTION |
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20 | |
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21 | Methods for manipulating file specifications. |
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22 | |
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23 | =head1 METHODS |
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24 | |
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25 | =over 2 |
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26 | |
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27 | =item canonpath |
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28 | |
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29 | On MacOS, there's nothing to be done. Returns what it's given. |
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30 | |
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31 | =cut |
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32 | |
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33 | sub canonpath { |
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34 | my ($self,$path) = @_; |
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35 | return $path; |
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36 | } |
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37 | |
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38 | =item catdir |
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39 | |
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40 | Concatenate two or more directory names to form a complete path ending with |
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41 | a directory. Put a trailing : on the end of the complete path if there |
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42 | isn't one, because that's what's done in MacPerl's environment. |
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43 | |
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44 | The fundamental requirement of this routine is that |
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45 | |
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46 | File::Spec->catdir(split(":",$path)) eq $path |
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47 | |
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48 | But because of the nature of Macintosh paths, some additional |
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49 | possibilities are allowed to make using this routine give reasonable results |
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50 | for some common situations. Here are the rules that are used. Each |
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51 | argument has its trailing ":" removed. Each argument, except the first, |
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52 | has its leading ":" removed. They are then joined together by a ":". |
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53 | |
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54 | So |
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55 | |
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56 | File::Spec->catdir("a","b") = "a:b:" |
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57 | File::Spec->catdir("a:",":b") = "a:b:" |
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58 | File::Spec->catdir("a:","b") = "a:b:" |
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59 | File::Spec->catdir("a",":b") = "a:b" |
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60 | File::Spec->catdir("a","","b") = "a::b" |
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61 | |
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62 | etc. |
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63 | |
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64 | To get a relative path (one beginning with :), begin the first argument with : |
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65 | or put a "" as the first argument. |
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66 | |
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67 | If you don't want to worry about these rules, never allow a ":" on the ends |
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68 | of any of the arguments except at the beginning of the first. |
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69 | |
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70 | Under MacPerl, there is an additional ambiguity. Does the user intend that |
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71 | |
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72 | File::Spec->catfile("LWP","Protocol","http.pm") |
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73 | |
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74 | be relative or absolute? There's no way of telling except by checking for the |
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75 | existence of LWP: or :LWP, and even there he may mean a dismounted volume or |
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76 | a relative path in a different directory (like in @INC). So those checks |
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77 | aren't done here. This routine will treat this as absolute. |
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78 | |
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79 | =cut |
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80 | |
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81 | sub catdir { |
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82 | shift; |
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83 | my @args = @_; |
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84 | my $result = shift @args; |
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85 | $result =~ s/:\Z(?!\n)//; |
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86 | foreach (@args) { |
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87 | s/:\Z(?!\n)//; |
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88 | s/^://s; |
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89 | $result .= ":$_"; |
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90 | } |
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91 | return "$result:"; |
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92 | } |
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93 | |
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94 | =item catfile |
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95 | |
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96 | Concatenate one or more directory names and a filename to form a |
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97 | complete path ending with a filename. Since this uses catdir, the |
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98 | same caveats apply. Note that the leading : is removed from the filename, |
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99 | so that |
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100 | |
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101 | File::Spec->catfile($ENV{HOME},"file"); |
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102 | |
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103 | and |
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104 | |
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105 | File::Spec->catfile($ENV{HOME},":file"); |
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106 | |
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107 | give the same answer, as one might expect. |
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108 | |
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109 | =cut |
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110 | |
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111 | sub catfile { |
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112 | my $self = shift; |
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113 | my $file = pop @_; |
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114 | return $file unless @_; |
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115 | my $dir = $self->catdir(@_); |
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116 | $file =~ s/^://s; |
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117 | return $dir.$file; |
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118 | } |
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119 | |
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120 | =item curdir |
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121 | |
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122 | Returns a string representing the current directory. |
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123 | |
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124 | =cut |
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125 | |
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126 | sub curdir { |
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127 | return ":"; |
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128 | } |
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129 | |
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130 | =item devnull |
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131 | |
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132 | Returns a string representing the null device. |
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133 | |
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134 | =cut |
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135 | |
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136 | sub devnull { |
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137 | return "Dev:Null"; |
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138 | } |
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139 | |
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140 | =item rootdir |
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141 | |
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142 | Returns a string representing the root directory. Under MacPerl, |
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143 | returns the name of the startup volume, since that's the closest in |
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144 | concept, although other volumes aren't rooted there. |
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145 | |
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146 | =cut |
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147 | |
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148 | sub rootdir { |
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149 | # |
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150 | # There's no real root directory on MacOS. The name of the startup |
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151 | # volume is returned, since that's the closest in concept. |
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152 | # |
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153 | require Mac::Files; |
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154 | my $system = Mac::Files::FindFolder(&Mac::Files::kOnSystemDisk, |
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155 | &Mac::Files::kSystemFolderType); |
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156 | $system =~ s/:.*\Z(?!\n)/:/s; |
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157 | return $system; |
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158 | } |
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159 | |
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160 | =item tmpdir |
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161 | |
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162 | Returns a string representation of the first existing directory |
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163 | from the following list or '' if none exist: |
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164 | |
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165 | $ENV{TMPDIR} |
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166 | |
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167 | =cut |
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168 | |
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169 | my $tmpdir; |
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170 | sub tmpdir { |
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171 | return $tmpdir if defined $tmpdir; |
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172 | $tmpdir = $ENV{TMPDIR} if -d $ENV{TMPDIR}; |
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173 | $tmpdir = '' unless defined $tmpdir; |
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174 | return $tmpdir; |
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175 | } |
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176 | |
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177 | =item updir |
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178 | |
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179 | Returns a string representing the parent directory. |
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180 | |
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181 | =cut |
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182 | |
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183 | sub updir { |
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184 | return "::"; |
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185 | } |
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186 | |
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187 | =item file_name_is_absolute |
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188 | |
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189 | Takes as argument a path and returns true, if it is an absolute path. In |
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190 | the case where a name can be either relative or absolute (for example, a |
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191 | folder named "HD" in the current working directory on a drive named "HD"), |
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192 | relative wins. Use ":" in the appropriate place in the path if you want to |
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193 | distinguish unambiguously. |
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194 | |
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195 | As a special case, the file name '' is always considered to be absolute. |
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196 | |
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197 | =cut |
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198 | |
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199 | sub file_name_is_absolute { |
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200 | my ($self,$file) = @_; |
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201 | if ($file =~ /:/) { |
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202 | return ($file !~ m/^:/s); |
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203 | } elsif ( $file eq '' ) { |
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204 | return 1 ; |
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205 | } else { |
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206 | return (! -e ":$file"); |
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207 | } |
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208 | } |
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209 | |
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210 | =item path |
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211 | |
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212 | Returns the null list for the MacPerl application, since the concept is |
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213 | usually meaningless under MacOS. But if you're using the MacPerl tool under |
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214 | MPW, it gives back $ENV{Commands} suitably split, as is done in |
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215 | :lib:ExtUtils:MM_Mac.pm. |
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216 | |
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217 | =cut |
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218 | |
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219 | sub path { |
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220 | # |
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221 | # The concept is meaningless under the MacPerl application. |
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222 | # Under MPW, it has a meaning. |
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223 | # |
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224 | return unless exists $ENV{Commands}; |
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225 | return split(/,/, $ENV{Commands}); |
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226 | } |
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227 | |
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228 | =item splitpath |
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229 | |
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230 | =cut |
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231 | |
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232 | sub splitpath { |
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233 | my ($self,$path, $nofile) = @_; |
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234 | |
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235 | my ($volume,$directory,$file) = ('','',''); |
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236 | |
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237 | if ( $nofile ) { |
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238 | ( $volume, $directory ) = $path =~ m@((?:[^:]+(?::|\Z(?!\n)))?)(.*)@s; |
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239 | } |
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240 | else { |
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241 | $path =~ |
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242 | m@^( (?: [^:]+: )? ) |
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243 | ( (?: .*: )? ) |
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244 | ( .* ) |
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245 | @xs; |
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246 | $volume = $1; |
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247 | $directory = $2; |
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248 | $file = $3; |
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249 | } |
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250 | |
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251 | # Make sure non-empty volumes and directories end in ':' |
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252 | $volume .= ':' if $volume =~ m@[^:]\Z(?!\n)@ ; |
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253 | $directory .= ':' if $directory =~ m@[^:]\Z(?!\n)@ ; |
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254 | return ($volume,$directory,$file); |
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255 | } |
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256 | |
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257 | |
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258 | =item splitdir |
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259 | |
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260 | =cut |
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261 | |
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262 | sub splitdir { |
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263 | my ($self,$directories) = @_ ; |
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264 | # |
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265 | # split() likes to forget about trailing null fields, so here we |
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266 | # check to be sure that there will not be any before handling the |
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267 | # simple case. |
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268 | # |
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269 | if ( $directories !~ m@:\Z(?!\n)@ ) { |
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270 | return split( m@:@, $directories ); |
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271 | } |
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272 | else { |
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273 | # |
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274 | # since there was a trailing separator, add a file name to the end, |
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275 | # then do the split, then replace it with ''. |
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276 | # |
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277 | my( @directories )= split( m@:@, "${directories}dummy" ) ; |
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278 | $directories[ $#directories ]= '' ; |
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279 | return @directories ; |
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280 | } |
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281 | } |
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282 | |
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283 | |
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284 | =item catpath |
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285 | |
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286 | =cut |
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287 | |
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288 | sub catpath { |
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289 | my $self = shift ; |
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290 | |
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291 | my $result = shift ; |
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292 | $result =~ s@^([^/])@/$1@s ; |
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293 | |
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294 | my $segment ; |
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295 | for $segment ( @_ ) { |
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296 | if ( $result =~ m@[^/]\Z(?!\n)@ && $segment =~ m@^[^/]@s ) { |
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297 | $result .= "/$segment" ; |
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298 | } |
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299 | elsif ( $result =~ m@/\Z(?!\n)@ && $segment =~ m@^/@s ) { |
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300 | $result =~ s@/+\Z(?!\n)@/@; |
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301 | $segment =~ s@^/+@@s; |
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302 | $result .= "$segment" ; |
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303 | } |
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304 | else { |
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305 | $result .= $segment ; |
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306 | } |
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307 | } |
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308 | |
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309 | return $result ; |
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310 | } |
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311 | |
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312 | =item abs2rel |
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313 | |
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314 | See L<File::Spec::Unix/abs2rel> for general documentation. |
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315 | |
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316 | Unlike C<File::Spec::Unix->abs2rel()>, this function will make |
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317 | checks against the local filesystem if necessary. See |
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318 | L</file_name_is_absolute> for details. |
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319 | |
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320 | =cut |
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321 | |
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322 | sub abs2rel { |
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323 | my($self,$path,$base) = @_; |
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324 | |
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325 | # Clean up $path |
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326 | if ( ! $self->file_name_is_absolute( $path ) ) { |
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327 | $path = $self->rel2abs( $path ) ; |
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328 | } |
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329 | |
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330 | # Figure out the effective $base and clean it up. |
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331 | if ( !defined( $base ) || $base eq '' ) { |
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332 | $base = cwd() ; |
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333 | } |
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334 | elsif ( ! $self->file_name_is_absolute( $base ) ) { |
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335 | $base = $self->rel2abs( $base ) ; |
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336 | } |
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337 | |
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338 | # Now, remove all leading components that are the same |
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339 | my @pathchunks = $self->splitdir( $path ); |
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340 | my @basechunks = $self->splitdir( $base ); |
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341 | |
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342 | while (@pathchunks && @basechunks && $pathchunks[0] eq $basechunks[0]) { |
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343 | shift @pathchunks ; |
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344 | shift @basechunks ; |
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345 | } |
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346 | |
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347 | $path = join( ':', @pathchunks ); |
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348 | |
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349 | # @basechunks now contains the number of directories to climb out of. |
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350 | $base = ':' x @basechunks ; |
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351 | |
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352 | return "$base:$path" ; |
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353 | } |
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354 | |
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355 | =item rel2abs |
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356 | |
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357 | See L<File::Spec::Unix/rel2abs> for general documentation. |
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358 | |
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359 | Unlike C<File::Spec::Unix->rel2abs()>, this function will make |
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360 | checks against the local filesystem if necessary. See |
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361 | L</file_name_is_absolute> for details. |
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362 | |
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363 | =cut |
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364 | |
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365 | sub rel2abs { |
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366 | my ($self,$path,$base ) = @_; |
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367 | |
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368 | if ( ! $self->file_name_is_absolute( $path ) ) { |
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369 | if ( !defined( $base ) || $base eq '' ) { |
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370 | $base = cwd() ; |
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371 | } |
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372 | elsif ( ! $self->file_name_is_absolute( $base ) ) { |
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373 | $base = $self->rel2abs( $base ) ; |
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374 | } |
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375 | else { |
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376 | $base = $self->canonpath( $base ) ; |
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377 | } |
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378 | |
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379 | $path = $self->canonpath("$base$path") ; |
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380 | } |
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381 | |
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382 | return $path ; |
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383 | } |
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384 | |
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385 | |
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386 | =back |
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387 | |
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388 | =head1 SEE ALSO |
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389 | |
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390 | L<File::Spec> |
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391 | |
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392 | =cut |
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393 | |
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394 | 1; |
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