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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 | # |
103 | # this can be used to override CORE::glob |
104 | # by saying C<use File::DosGlob 'glob';>. |
105 | # |
106 | sub glob { doglob(1,@_) } |
107 | |
108 | sub import { |
109 | my $pkg = shift; |
110 | my $callpkg = caller(0); |
111 | my $sym = shift; |
112 | *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} if $sym eq 'glob'; |
113 | } |
114 | |
115 | 1; |
116 | |
117 | __END__ |
118 | |
119 | =head1 NAME |
120 | |
121 | File::DosGlob - DOS like globbing and then some |
122 | |
123 | perlglob.bat - a more capable perlglob.exe replacement |
124 | |
125 | =head1 SYNOPSIS |
126 | |
127 | require 5.004; |
128 | use File::DosGlob 'glob'; # override CORE::glob |
129 | @perlfiles = glob "..\\pe?l/*.p?"; |
130 | print <..\\pe?l/*.p?>; |
131 | |
132 | # from the command line |
133 | > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>" |
134 | |
135 | > perlglob ../pe*/*p? |
136 | |
137 | =head1 DESCRIPTION |
138 | |
139 | A module that implements DOS-like globbing with a few enhancements. |
140 | This file is also a portable replacement for perlglob.exe. It |
141 | is largely compatible with perlglob.exe (the M$ setargv.obj |
142 | version) in all but one respect--it understands wildcards in |
143 | directory components. |
144 | |
145 | For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in |
146 | that it will find something like '..\lib\File/DosGlob.pm' alright). |
147 | Note that all path components are case-insensitive, and that |
148 | backslashes and forward slashes are both accepted, and preserved. |
149 | You may have to double the backslashes if you are putting them in |
150 | literally, due to double-quotish parsing of the pattern by perl. |
151 | |
152 | When invoked as a program, it will print null-separated filenames |
153 | to standard output. |
154 | |
155 | While one may replace perlglob.exe with this, usage by overriding |
156 | CORE::glob via importation should be much more efficient, because |
157 | it avoids launching a separate process, and is therefore strongly |
158 | recommended. |
159 | |
160 | Extending it to csh patterns is left as an exercise to the reader. |
161 | |
162 | =head1 EXPORTS (by request only) |
163 | |
164 | glob() |
165 | |
166 | =head1 BUGS |
167 | |
168 | Should probably be built into the core, and needs to stop |
169 | pandering to DOS habits. Needs a dose of optimizium too. |
170 | |
171 | =head1 AUTHOR |
172 | |
173 | Gurusamy Sarathy <gsar@umich.edu> |
174 | |
175 | =head1 HISTORY |
176 | |
177 | =over 4 |
178 | |
179 | =item * |
180 | |
181 | A few dir-vs-file optimizations result in glob importation being |
182 | 10 times faster than using perlglob.exe, and using perlglob.bat is |
183 | only twice as slow as perlglob.exe (GSAR 28-MAY-97) |
184 | |
185 | =item * |
186 | |
187 | Several cleanups prompted by lack of compatible perlglob.exe |
188 | under Borland (GSAR 27-MAY-97) |
189 | |
190 | =item * |
191 | |
192 | Initial version (GSAR 20-FEB-97) |
193 | |
194 | =back |
195 | |
196 | =head1 SEE ALSO |
197 | |
198 | perl |
199 | |
200 | =cut |
201 | |