Commit | Line | Data |
08aa1457 |
1 | #!perl -w |
2 | |
3 | # |
4 | # Documentation at the __END__ |
5 | # |
6 | |
7 | package File::DosGlob; |
8 | |
9 | unless (caller) { |
10 | $| = 1; |
11 | while (@ARGV) { |
12 | # |
13 | # We have to do this one by one for compatibility reasons. |
14 | # If an arg doesn't match anything, we are supposed to return |
15 | # the original arg. I know, it stinks, eh? |
16 | # |
17 | my $arg = shift; |
18 | my @m = doglob(1,$arg); |
19 | print (@m ? join("\0", sort @m) : $arg); |
20 | print "\0" if @ARGV; |
21 | } |
22 | } |
23 | |
24 | sub doglob { |
25 | my $cond = shift; |
26 | my @retval = (); |
27 | #print "doglob: ", join('|', @_), "\n"; |
28 | OUTER: |
29 | for my $arg (@_) { |
30 | local $_ = $arg; |
31 | my @matched = (); |
32 | my @globdirs = (); |
33 | my $head = '.'; |
34 | my $sepchr = '/'; |
35 | next OUTER unless defined $_ and $_ ne ''; |
36 | # if arg is within quotes strip em and do no globbing |
37 | if (/^"(.*)"$/) { |
38 | $_ = $1; |
39 | if ($cond eq 'd') { push(@retval, $_) if -d $_ } |
40 | else { push(@retval, $_) if -e $_ } |
41 | next OUTER; |
42 | } |
43 | if (m|^(.*)([\\/])([^\\/]*)$|) { |
44 | my $tail; |
45 | ($head, $sepchr, $tail) = ($1,$2,$3); |
46 | #print "div: |$head|$sepchr|$tail|\n"; |
47 | push (@retval, $_), next OUTER if $tail eq ''; |
48 | if ($head =~ /[*?]/) { |
49 | @globdirs = doglob('d', $head); |
50 | push(@retval, doglob($cond, map {"$_$sepchr$tail"} @globdirs)), |
51 | next OUTER if @globdirs; |
52 | } |
53 | $head .= $sepchr if $head eq '' or $head =~ /^[A-Za-z]:$/; |
54 | $_ = $tail; |
55 | } |
56 | # |
57 | # If file component has no wildcards, we can avoid opendir |
58 | unless (/[*?]/) { |
59 | $head = '' if $head eq '.'; |
60 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
61 | $head .= $_; |
62 | if ($cond eq 'd') { push(@retval,$head) if -d $head } |
63 | else { push(@retval,$head) if -e $head } |
64 | next OUTER; |
65 | } |
66 | opendir(D, $head) or next OUTER; |
67 | my @leaves = readdir D; |
68 | closedir D; |
69 | $head = '' if $head eq '.'; |
70 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
71 | |
72 | # escape regex metachars but not glob chars |
73 | s:([].+^\-\${}[|]):\\$1:g; |
74 | # and convert DOS-style wildcards to regex |
75 | s/\*/.*/g; |
76 | s/\?/.?/g; |
77 | |
78 | #print "regex: '$_', head: '$head'\n"; |
79 | my $matchsub = eval 'sub { $_[0] =~ m|^' . $_ . '$|io }'; |
80 | warn($@), next OUTER if $@; |
81 | INNER: |
82 | for my $e (@leaves) { |
83 | next INNER if $e eq '.' or $e eq '..'; |
84 | next INNER if $cond eq 'd' and ! -d "$head$e"; |
85 | push(@matched, "$head$e"), next INNER if &$matchsub($e); |
86 | # |
87 | # [DOS compatibility special case] |
88 | # Failed, add a trailing dot and try again, but only |
89 | # if name does not have a dot in it *and* pattern |
90 | # has a dot *and* name is shorter than 9 chars. |
91 | # |
92 | if (index($e,'.') == -1 and length($e) < 9 |
93 | and index($_,'\\.') != -1) { |
94 | push(@matched, "$head$e"), next INNER if &$matchsub("$e."); |
95 | } |
96 | } |
97 | push @retval, @matched if @matched; |
98 | } |
99 | return @retval; |
100 | } |
101 | |
102 | # |
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103 | # this can be used to override CORE::glob in a specific |
104 | # package by saying C<use File::DosGlob 'glob';> in that |
105 | # namespace. |
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106 | # |
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107 | |
108 | # context (keyed by second cxix arg provided by core) |
109 | my %iter; |
110 | my %entries; |
111 | |
112 | sub glob { |
113 | my $pat = shift; |
114 | my $cxix = shift; |
115 | |
116 | # glob without args defaults to $_ |
117 | $pat = $_ unless defined $pat; |
118 | |
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) { |
125 | $entries{$cxix} = [doglob(1,$pat)]; |
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; |
148 | my $callpkg = caller(0); |
149 | my $sym = shift; |
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150 | *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} |
151 | if defined($sym) and $sym eq 'glob'; |
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152 | } |
153 | |
154 | 1; |
155 | |
156 | __END__ |
157 | |
158 | =head1 NAME |
159 | |
160 | File::DosGlob - DOS like globbing and then some |
161 | |
162 | perlglob.bat - a more capable perlglob.exe replacement |
163 | |
164 | =head1 SYNOPSIS |
165 | |
166 | require 5.004; |
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167 | |
168 | # override CORE::glob in current package |
169 | use File::DosGlob 'glob'; |
170 | |
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171 | @perlfiles = glob "..\\pe?l/*.p?"; |
172 | print <..\\pe?l/*.p?>; |
173 | |
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174 | # from the command line (overrides only in main::) |
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175 | > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>" |
176 | |
177 | > perlglob ../pe*/*p? |
178 | |
179 | =head1 DESCRIPTION |
180 | |
181 | A module that implements DOS-like globbing with a few enhancements. |
182 | This file is also a portable replacement for perlglob.exe. It |
183 | is largely compatible with perlglob.exe (the M$ setargv.obj |
184 | version) in all but one respect--it understands wildcards in |
185 | directory components. |
186 | |
187 | For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in |
188 | that it will find something like '..\lib\File/DosGlob.pm' alright). |
189 | Note that all path components are case-insensitive, and that |
190 | backslashes and forward slashes are both accepted, and preserved. |
191 | You may have to double the backslashes if you are putting them in |
192 | literally, due to double-quotish parsing of the pattern by perl. |
193 | |
194 | When invoked as a program, it will print null-separated filenames |
195 | to standard output. |
196 | |
197 | While one may replace perlglob.exe with this, usage by overriding |
198 | CORE::glob via importation should be much more efficient, because |
199 | it avoids launching a separate process, and is therefore strongly |
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200 | recommended. Note that it is currently possible to override |
201 | builtins like glob() only on a per-package basis, not "globally". |
202 | Thus, every namespace that wants to override glob() must explicitly |
203 | request the override. See L<perlsub>. |
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204 | |
205 | Extending it to csh patterns is left as an exercise to the reader. |
206 | |
207 | =head1 EXPORTS (by request only) |
208 | |
209 | glob() |
210 | |
211 | =head1 BUGS |
212 | |
213 | Should probably be built into the core, and needs to stop |
214 | pandering to DOS habits. Needs a dose of optimizium too. |
215 | |
216 | =head1 AUTHOR |
217 | |
218 | Gurusamy Sarathy <gsar@umich.edu> |
219 | |
220 | =head1 HISTORY |
221 | |
222 | =over 4 |
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 | |
249 | =cut |
250 | |