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1 | #!perl -w |
2 | |
3 | # |
4 | # Documentation at the __END__ |
5 | # |
6 | |
7 | package File::DosGlob; |
8 | |
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9 | sub doglob { |
10 | my $cond = shift; |
11 | my @retval = (); |
12 | #print "doglob: ", join('|', @_), "\n"; |
13 | OUTER: |
14 | for my $arg (@_) { |
15 | local $_ = $arg; |
16 | my @matched = (); |
17 | my @globdirs = (); |
18 | my $head = '.'; |
19 | my $sepchr = '/'; |
20 | next OUTER unless defined $_ and $_ ne ''; |
21 | # if arg is within quotes strip em and do no globbing |
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22 | if (/^"(.*)"\z/s) { |
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23 | $_ = $1; |
24 | if ($cond eq 'd') { push(@retval, $_) if -d $_ } |
25 | else { push(@retval, $_) if -e $_ } |
26 | next OUTER; |
27 | } |
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28 | # wildcards with a drive prefix such as h:*.pm must be changed |
29 | # to h:./*.pm to expand correctly |
30 | if (m|^([A-Za-z]:)[^/\\]|s) { |
31 | substr($_,0,2) = $1 . "./"; |
32 | } |
33 | if (m|^(.*)([\\/])([^\\/]*)\z|s) { |
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34 | my $tail; |
35 | ($head, $sepchr, $tail) = ($1,$2,$3); |
36 | #print "div: |$head|$sepchr|$tail|\n"; |
37 | push (@retval, $_), next OUTER if $tail eq ''; |
38 | if ($head =~ /[*?]/) { |
39 | @globdirs = doglob('d', $head); |
40 | push(@retval, doglob($cond, map {"$_$sepchr$tail"} @globdirs)), |
41 | next OUTER if @globdirs; |
42 | } |
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43 | $head .= $sepchr if $head eq '' or $head =~ /^[A-Za-z]:\z/s; |
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44 | $_ = $tail; |
45 | } |
46 | # |
47 | # If file component has no wildcards, we can avoid opendir |
48 | unless (/[*?]/) { |
49 | $head = '' if $head eq '.'; |
50 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
51 | $head .= $_; |
52 | if ($cond eq 'd') { push(@retval,$head) if -d $head } |
53 | else { push(@retval,$head) if -e $head } |
54 | next OUTER; |
55 | } |
56 | opendir(D, $head) or next OUTER; |
57 | my @leaves = readdir D; |
58 | closedir D; |
59 | $head = '' if $head eq '.'; |
60 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
61 | |
62 | # escape regex metachars but not glob chars |
63 | s:([].+^\-\${}[|]):\\$1:g; |
64 | # and convert DOS-style wildcards to regex |
65 | s/\*/.*/g; |
66 | s/\?/.?/g; |
67 | |
68 | #print "regex: '$_', head: '$head'\n"; |
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69 | my $matchsub = eval 'sub { $_[0] =~ m|^' . $_ . '\\z|ios }'; |
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70 | warn($@), next OUTER if $@; |
71 | INNER: |
72 | for my $e (@leaves) { |
73 | next INNER if $e eq '.' or $e eq '..'; |
74 | next INNER if $cond eq 'd' and ! -d "$head$e"; |
75 | push(@matched, "$head$e"), next INNER if &$matchsub($e); |
76 | # |
77 | # [DOS compatibility special case] |
78 | # Failed, add a trailing dot and try again, but only |
79 | # if name does not have a dot in it *and* pattern |
80 | # has a dot *and* name is shorter than 9 chars. |
81 | # |
82 | if (index($e,'.') == -1 and length($e) < 9 |
83 | and index($_,'\\.') != -1) { |
84 | push(@matched, "$head$e"), next INNER if &$matchsub("$e."); |
85 | } |
86 | } |
87 | push @retval, @matched if @matched; |
88 | } |
89 | return @retval; |
90 | } |
91 | |
92 | # |
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93 | # this can be used to override CORE::glob in a specific |
94 | # package by saying C<use File::DosGlob 'glob';> in that |
95 | # namespace. |
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96 | # |
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97 | |
98 | # context (keyed by second cxix arg provided by core) |
99 | my %iter; |
100 | my %entries; |
101 | |
102 | sub glob { |
103 | my $pat = shift; |
104 | my $cxix = shift; |
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105 | my @pat; |
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106 | |
107 | # glob without args defaults to $_ |
108 | $pat = $_ unless defined $pat; |
109 | |
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110 | # extract patterns |
111 | if ($pat =~ /\s/) { |
112 | require Text::ParseWords; |
113 | @pat = Text::ParseWords::parse_line('\s+',0,$pat); |
114 | } |
115 | else { |
116 | push @pat, $pat; |
117 | } |
118 | |
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119 | # assume global context if not provided one |
120 | $cxix = '_G_' unless defined $cxix; |
121 | $iter{$cxix} = 0 unless exists $iter{$cxix}; |
122 | |
123 | # if we're just beginning, do it all first |
124 | if ($iter{$cxix} == 0) { |
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125 | $entries{$cxix} = [doglob(1,@pat)]; |
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126 | } |
127 | |
128 | # chuck it all out, quick or slow |
129 | if (wantarray) { |
130 | delete $iter{$cxix}; |
131 | return @{delete $entries{$cxix}}; |
132 | } |
133 | else { |
134 | if ($iter{$cxix} = scalar @{$entries{$cxix}}) { |
135 | return shift @{$entries{$cxix}}; |
136 | } |
137 | else { |
138 | # return undef for EOL |
139 | delete $iter{$cxix}; |
140 | delete $entries{$cxix}; |
141 | return undef; |
142 | } |
143 | } |
144 | } |
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145 | |
146 | sub import { |
147 | my $pkg = shift; |
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148 | return unless @_; |
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149 | my $sym = shift; |
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150 | my $callpkg = ($sym =~ s/^GLOBAL_//s ? 'CORE::GLOBAL' : caller(0)); |
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151 | *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} if $sym eq 'glob'; |
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152 | } |
153 | |
154 | 1; |
155 | |
156 | __END__ |
157 | |
158 | =head1 NAME |
159 | |
160 | File::DosGlob - DOS like globbing and then some |
161 | |
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162 | =head1 SYNOPSIS |
163 | |
164 | require 5.004; |
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165 | |
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166 | # override CORE::glob in current package |
167 | use File::DosGlob 'glob'; |
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168 | |
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169 | # override CORE::glob in ALL packages (use with extreme caution!) |
170 | use File::DosGlob 'GLOBAL_glob'; |
171 | |
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172 | @perlfiles = glob "..\\pe?l/*.p?"; |
173 | print <..\\pe?l/*.p?>; |
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174 | |
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175 | # from the command line (overrides only in main::) |
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176 | > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>" |
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177 | |
178 | =head1 DESCRIPTION |
179 | |
180 | A module that implements DOS-like globbing with a few enhancements. |
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181 | It is largely compatible with perlglob.exe (the M$ setargv.obj |
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182 | version) in all but one respect--it understands wildcards in |
183 | directory components. |
184 | |
185 | For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in |
186 | that it will find something like '..\lib\File/DosGlob.pm' alright). |
187 | Note that all path components are case-insensitive, and that |
188 | backslashes and forward slashes are both accepted, and preserved. |
189 | You may have to double the backslashes if you are putting them in |
190 | literally, due to double-quotish parsing of the pattern by perl. |
191 | |
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192 | Spaces in the argument delimit distinct patterns, so |
193 | C<glob('*.exe *.dll')> globs all filenames that end in C<.exe> |
194 | or C<.dll>. If you want to put in literal spaces in the glob |
195 | pattern, you can escape them with either double quotes, or backslashes. |
196 | e.g. C<glob('c:/"Program Files"/*/*.dll')>, or |
197 | C<glob('c:/Program\ Files/*/*.dll')>. The argument is tokenized using |
198 | C<Text::ParseWords::parse_line()>, so see L<Text::ParseWords> for details |
199 | of the quoting rules used. |
200 | |
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201 | Extending it to csh patterns is left as an exercise to the reader. |
202 | |
203 | =head1 EXPORTS (by request only) |
204 | |
205 | glob() |
206 | |
207 | =head1 BUGS |
208 | |
209 | Should probably be built into the core, and needs to stop |
210 | pandering to DOS habits. Needs a dose of optimizium too. |
211 | |
212 | =head1 AUTHOR |
213 | |
6e238990 |
214 | Gurusamy Sarathy <gsar@activestate.com> |
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215 | |
216 | =head1 HISTORY |
217 | |
218 | =over 4 |
219 | |
220 | =item * |
221 | |
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222 | Support for globally overriding glob() (GSAR 3-JUN-98) |
223 | |
224 | =item * |
225 | |
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226 | Scalar context, independent iterator context fixes (GSAR 15-SEP-97) |
227 | |
228 | =item * |
229 | |
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230 | A few dir-vs-file optimizations result in glob importation being |
231 | 10 times faster than using perlglob.exe, and using perlglob.bat is |
232 | only twice as slow as perlglob.exe (GSAR 28-MAY-97) |
233 | |
234 | =item * |
235 | |
236 | Several cleanups prompted by lack of compatible perlglob.exe |
237 | under Borland (GSAR 27-MAY-97) |
238 | |
239 | =item * |
240 | |
241 | Initial version (GSAR 20-FEB-97) |
242 | |
243 | =back |
244 | |
245 | =head1 SEE ALSO |
246 | |
247 | perl |
248 | |
dfb634a9 |
249 | perlglob.bat |
250 | |
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251 | Text::ParseWords |
252 | |
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253 | =cut |
254 | |