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920dae64 AT |
1 | package blib; |
2 | ||
3 | =head1 NAME | |
4 | ||
5 | blib - Use MakeMaker's uninstalled version of a package | |
6 | ||
7 | =head1 SYNOPSIS | |
8 | ||
9 | perl -Mblib script [args...] | |
10 | ||
11 | perl -Mblib=dir script [args...] | |
12 | ||
13 | =head1 DESCRIPTION | |
14 | ||
15 | Looks for MakeMaker-like I<'blib'> directory structure starting in | |
16 | I<dir> (or current directory) and working back up to five levels of '..'. | |
17 | ||
18 | Intended for use on command line with B<-M> option as a way of testing | |
19 | arbitrary scripts against an uninstalled version of a package. | |
20 | ||
21 | However it is possible to : | |
22 | ||
23 | use blib; | |
24 | or | |
25 | use blib '..'; | |
26 | ||
27 | etc. if you really must. | |
28 | ||
29 | =head1 BUGS | |
30 | ||
31 | Pollutes global name space for development only task. | |
32 | ||
33 | =head1 AUTHOR | |
34 | ||
35 | Nick Ing-Simmons nik@tiuk.ti.com | |
36 | ||
37 | =cut | |
38 | ||
39 | use Cwd; | |
40 | use File::Spec; | |
41 | ||
42 | use vars qw($VERSION $Verbose); | |
43 | $VERSION = '1.03'; | |
44 | $Verbose = 0; | |
45 | ||
46 | sub import | |
47 | { | |
48 | my $package = shift; | |
49 | my $dir = getcwd; | |
50 | if ($^O eq 'VMS') { ($dir = VMS::Filespec::unixify($dir)) =~ s-/\z--; } | |
51 | if (@_) | |
52 | { | |
53 | $dir = shift; | |
54 | $dir =~ s/blib\z//; | |
55 | $dir =~ s,/+\z,,; | |
56 | $dir = File::Spec->curdir unless ($dir); | |
57 | die "$dir is not a directory\n" unless (-d $dir); | |
58 | } | |
59 | my $i = 5; | |
60 | my($blib, $blib_lib, $blib_arch); | |
61 | while ($i--) | |
62 | { | |
63 | $blib = File::Spec->catdir($dir, "blib"); | |
64 | $blib_lib = File::Spec->catdir($blib, "lib"); | |
65 | ||
66 | if ($^O eq 'MacOS') | |
67 | { | |
68 | $blib_arch = File::Spec->catdir($blib_lib, $MacPerl::Architecture); | |
69 | } | |
70 | else | |
71 | { | |
72 | $blib_arch = File::Spec->catdir($blib, "arch"); | |
73 | } | |
74 | ||
75 | if (-d $blib && -d $blib_arch && -d $blib_lib) | |
76 | { | |
77 | unshift(@INC,$blib_arch,$blib_lib); | |
78 | warn "Using $blib\n" if $Verbose; | |
79 | return; | |
80 | } | |
81 | $dir = File::Spec->catdir($dir, File::Spec->updir); | |
82 | } | |
83 | die "Cannot find blib even in $dir\n"; | |
84 | } | |
85 | ||
86 | 1; |