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08aa1457 |
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 $_ ne ''; |
21 | # if arg is within quotes strip em and do no globbing |
22 | if (/^"(.*)"$/) { |
23 | $_ = $1; |
24 | if ($cond eq 'd') { push(@retval, $_) if -d $_ } |
25 | else { push(@retval, $_) if -e $_ } |
26 | next OUTER; |
27 | } |
28 | if (m|^(.*)([\\/])([^\\/]*)$|) { |
29 | my $tail; |
30 | ($head, $sepchr, $tail) = ($1,$2,$3); |
31 | #print "div: |$head|$sepchr|$tail|\n"; |
32 | push (@retval, $_), next OUTER if $tail eq ''; |
33 | if ($head =~ /[*?]/) { |
34 | @globdirs = doglob('d', $head); |
35 | push(@retval, doglob($cond, map {"$_$sepchr$tail"} @globdirs)), |
36 | next OUTER if @globdirs; |
37 | } |
38 | $head .= $sepchr if $head eq '' or $head =~ /^[A-Za-z]:$/; |
39 | $_ = $tail; |
40 | } |
41 | # |
42 | # If file component has no wildcards, we can avoid opendir |
43 | unless (/[*?]/) { |
44 | $head = '' if $head eq '.'; |
45 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
46 | $head .= $_; |
47 | if ($cond eq 'd') { push(@retval,$head) if -d $head } |
48 | else { push(@retval,$head) if -e $head } |
49 | next OUTER; |
50 | } |
51 | opendir(D, $head) or next OUTER; |
52 | my @leaves = readdir D; |
53 | closedir D; |
54 | $head = '' if $head eq '.'; |
55 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
56 | |
57 | # escape regex metachars but not glob chars |
58 | s:([].+^\-\${}[|]):\\$1:g; |
59 | # and convert DOS-style wildcards to regex |
60 | s/\*/.*/g; |
61 | s/\?/.?/g; |
62 | |
63 | #print "regex: '$_', head: '$head'\n"; |
64 | my $matchsub = eval 'sub { $_[0] =~ m|^' . $_ . '$|io }'; |
65 | warn($@), next OUTER if $@; |
66 | INNER: |
67 | for my $e (@leaves) { |
68 | next INNER if $e eq '.' or $e eq '..'; |
69 | next INNER if $cond eq 'd' and ! -d "$head$e"; |
70 | push(@matched, "$head$e"), next INNER if &$matchsub($e); |
71 | # |
72 | # [DOS compatibility special case] |
73 | # Failed, add a trailing dot and try again, but only |
74 | # if name does not have a dot in it *and* pattern |
75 | # has a dot *and* name is shorter than 9 chars. |
76 | # |
77 | if (index($e,'.') == -1 and length($e) < 9 |
78 | and index($_,'\\.') != -1) { |
79 | push(@matched, "$head$e"), next INNER if &$matchsub("$e."); |
80 | } |
81 | } |
82 | push @retval, @matched if @matched; |
83 | } |
84 | return @retval; |
85 | } |
86 | |
87 | # |
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88 | # this can be used to override CORE::glob in a specific |
89 | # package by saying C<use File::DosGlob 'glob';> in that |
90 | # namespace. |
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91 | # |
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92 | |
93 | # context (keyed by second cxix arg provided by core) |
94 | my %iter; |
95 | my %entries; |
96 | |
97 | sub glob { |
98 | my $pat = shift; |
99 | my $cxix = shift; |
100 | |
101 | # glob without args defaults to $_ |
102 | $pat = $_ unless defined $pat; |
103 | |
104 | # assume global context if not provided one |
105 | $cxix = '_G_' unless defined $cxix; |
106 | $iter{$cxix} = 0 unless exists $iter{$cxix}; |
107 | |
108 | # if we're just beginning, do it all first |
109 | if ($iter{$cxix} == 0) { |
110 | $entries{$cxix} = [doglob(1,$pat)]; |
111 | } |
112 | |
113 | # chuck it all out, quick or slow |
114 | if (wantarray) { |
115 | delete $iter{$cxix}; |
116 | return @{delete $entries{$cxix}}; |
117 | } |
118 | else { |
119 | if ($iter{$cxix} = scalar @{$entries{$cxix}}) { |
120 | return shift @{$entries{$cxix}}; |
121 | } |
122 | else { |
123 | # return undef for EOL |
124 | delete $iter{$cxix}; |
125 | delete $entries{$cxix}; |
126 | return undef; |
127 | } |
128 | } |
129 | } |
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130 | |
131 | sub import { |
132 | my $pkg = shift; |
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133 | return unless @_; |
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134 | my $sym = shift; |
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135 | my $callpkg = ($sym =~ s/^GLOBAL_// ? 'CORE::GLOBAL' : caller(0)); |
136 | *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} if $sym eq 'glob'; |
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137 | } |
138 | |
139 | 1; |
140 | |
141 | __END__ |
142 | |
143 | =head1 NAME |
144 | |
145 | File::DosGlob - DOS like globbing and then some |
146 | |
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147 | =head1 SYNOPSIS |
148 | |
149 | require 5.004; |
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150 | |
151 | # override CORE::glob in current package |
152 | use File::DosGlob 'glob'; |
153 | |
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154 | # override CORE::glob in ALL packages (use with extreme caution!) |
155 | use File::DosGlob 'GLOBAL_glob'; |
156 | |
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157 | @perlfiles = glob "..\\pe?l/*.p?"; |
158 | print <..\\pe?l/*.p?>; |
159 | |
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160 | # from the command line (overrides only in main::) |
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161 | > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>" |
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162 | |
163 | =head1 DESCRIPTION |
164 | |
165 | A module that implements DOS-like globbing with a few enhancements. |
dfb634a9 |
166 | It is largely compatible with perlglob.exe (the M$ setargv.obj |
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167 | version) in all but one respect--it understands wildcards in |
168 | directory components. |
169 | |
170 | For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in |
171 | that it will find something like '..\lib\File/DosGlob.pm' alright). |
172 | Note that all path components are case-insensitive, and that |
173 | backslashes and forward slashes are both accepted, and preserved. |
174 | You may have to double the backslashes if you are putting them in |
175 | literally, due to double-quotish parsing of the pattern by perl. |
176 | |
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177 | Extending it to csh patterns is left as an exercise to the reader. |
178 | |
179 | =head1 EXPORTS (by request only) |
180 | |
181 | glob() |
182 | |
183 | =head1 BUGS |
184 | |
185 | Should probably be built into the core, and needs to stop |
186 | pandering to DOS habits. Needs a dose of optimizium too. |
187 | |
188 | =head1 AUTHOR |
189 | |
190 | Gurusamy Sarathy <gsar@umich.edu> |
191 | |
192 | =head1 HISTORY |
193 | |
194 | =over 4 |
195 | |
196 | =item * |
197 | |
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198 | Support for globally overriding glob() (GSAR 3-JUN-98) |
199 | |
200 | =item * |
201 | |
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202 | Scalar context, independent iterator context fixes (GSAR 15-SEP-97) |
203 | |
204 | =item * |
205 | |
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206 | A few dir-vs-file optimizations result in glob importation being |
207 | 10 times faster than using perlglob.exe, and using perlglob.bat is |
208 | only twice as slow as perlglob.exe (GSAR 28-MAY-97) |
209 | |
210 | =item * |
211 | |
212 | Several cleanups prompted by lack of compatible perlglob.exe |
213 | under Borland (GSAR 27-MAY-97) |
214 | |
215 | =item * |
216 | |
217 | Initial version (GSAR 20-FEB-97) |
218 | |
219 | =back |
220 | |
221 | =head1 SEE ALSO |
222 | |
223 | perl |
224 | |
dfb634a9 |
225 | perlglob.bat |
226 | |
08aa1457 |
227 | =cut |
228 | |