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package AutoSplit;
require 5.000;
require Exporter;
use Config;
use Carp;
@ISA = qw(Exporter);
@EXPORT = qw(&autosplit &autosplit_lib_modules);
@EXPORT_OK = qw($Verbose $Keep);
# for portability warn about names longer than $maxlen
$Maxlen = 8; # 8 for dos, 11 (14-".al") for SYSVR3
$Verbose = 1; # 0=none, 1=minimal, 2=list .al files
$Keep = 0;
$IndexFile = "autosplit.ix"; # file also serves as timestamp
$maxflen = 255;
$maxflen = 14 if $Config{'d_flexfnam'} ne 'define';
$vms = ($Config{'osname'} eq 'VMS');
sub autosplit{
my($file, $autodir) = @_;
autosplit_file($file, $autodir, $Keep, 1, 0);
}
# This function is used during perl building/installation
# ./miniperl -e 'use AutoSplit; autosplit_modules(@ARGV)' ...
sub autosplit_lib_modules{
my(@modules) = @_; # list of Module names
foreach(@modules){
s#::#/#g; # incase specified as ABC::XYZ
s#^lib/##; # incase specified as lib/*.pm
if ($vms && /[:>\]]/) { # may need to convert VMS-style filespecs
my ($dir,$name) = (/(.*])(.*)/);
$dir =~ s/.*lib[\.\]]//;
$dir =~ s#[\.\]]#/#g;
$_ = $dir . $name;
}
autosplit_file("lib/$_", "lib/auto", $Keep, 1, 1);
}
0;
}
# private functions
sub autosplit_file{
my($filename, $autodir, $keep, $check_for_autoloader, $check_mod_time) = @_;
my(@names);
# where to write output files
$autodir = "lib/auto" unless $autodir;
die "autosplit directory $autodir does not exist" unless -d $autodir;
# allow just a package name to be used
$filename .= ".pm" unless ($filename =~ m/\.pm$/);
open(IN, "<$filename") || die "AutoSplit: Can't open $filename: $!\n";
my($pm_mod_time) = (stat($filename))[9];
my($autoloader_seen) = 0;
while (<IN>) {
# record last package name seen
$package = $1 if (m/^\s*package\s+([\w:]+)\s*;/);
++$autoloader_seen if m/^\s*use\s+AutoLoader\b/;
++$autoloader_seen if m/\bISA\s*=.*\bAutoLoader\b/;
last if /^__END__/;
}
return 0 if ($check_for_autoloader && !$autoloader_seen);
$_ or die "Can't find __END__ in $filename\n";
$package or die "Can't find 'package Name;' in $filename\n";
my($modpname) = $package; $modpname =~ s#::#/#g;
my($al_idx_file) = "$autodir/$modpname/$IndexFile";
die "Package $package does not match filename $filename"
unless ($filename =~ m/$modpname.pm$/ or
$vms && $filename =~ m/$modpname.pm/i);
if ($check_mod_time){
my($al_ts_time) = (stat("$al_idx_file"))[9] || 1;
if ($al_ts_time >= $pm_mod_time){
print "AutoSplit skipped ($al_idx_file newer that $filename)\n"
if ($Verbose >= 2);
return undef; # one undef, not a list
}
}
my($from) = ($Verbose>=2) ? "$filename => " : "";
print "AutoSplitting $package ($from$autodir/$modpname)\n"
if $Verbose;
unless (-d "$autodir/$modpname"){
local($", @p)="/";
foreach(split(/\//,"$autodir/$modpname")){
push(@p, $_);
next if -d "@p";
mkdir("@p",0777) or die "AutoSplit unable to mkdir @p: $!";
}
}
# We must try to deal with some SVR3 systems with a limit of 14
# characters for file names. Sadly we *cannot* simply truncate all
# file names to 14 characters on these systems because we *must*
# create filenames which exactly match the names used by AutoLoader.pm.
# This is a problem because some systems silently truncate the file
# names while others treat long file names as an error.
# We do not yet deal with multiple packages within one file.
# Ideally both of these styles should work.
#
# package NAME;
# __END__
# sub AAA { ... }
# package NAME::option1;
# sub BBB { ... }
# package NAME::option2;
# sub BBB { ... }
#
# package NAME;
# __END__
# sub AAA { ... }
# sub NAME::option1::BBB { ... }
# sub NAME::option2::BBB { ... }
#
# For now both of these produce warnings.
open(OUT,">/dev/null") || open(OUT,">nla0:"); # avoid 'not opened' warning
my(@subnames);
while (<IN>) {
if (/^package ([\w:]+)\s*;/) {
warn "package $1; in AutoSplit section ignored. Not currently supported.";
}
if (/^sub ([\w:]+)/) {
print OUT "1;\n";
my($subname) = $1;
if ($subname =~ m/::/){
warn "subs with package names not currently supported in AutoSplit section";
}
push(@subnames, $subname);
my($lname, $sname) = ($subname, substr($subname,0,$maxflen-3));
my($lpath) = "$autodir/$modpname/$lname.al";
my($spath) = "$autodir/$modpname/$sname.al";
unless(open(OUT, ">$lpath")){
open(OUT, ">$spath") or die "Can't create $spath: $!\n";
push(@names, $sname);
print " writing $spath (with truncated name)\n"
if ($Verbose>=1);
}else{
push(@names, $lname);
print " writing $lpath\n" if ($Verbose>=2);
}
print OUT "# NOTE: Derived from $filename. ",
"Changes made here will be lost.\n";
print OUT "package $package;\n\n";
}
print OUT $_;
}
print OUT "1;\n";
close(OUT);
close(IN);
if (!$keep){ # don't keep any obsolete *.al files in the directory
my(%names);
@names{@names} = @names;
opendir(OUTDIR,"$autodir/$modpname");
foreach(sort readdir(OUTDIR)){
next unless /\.al$/;
my($subname) = m/(.*)\.al$/;
next if $names{substr($subname,0,$maxflen-3)};
my($file) = "$autodir/$modpname/$_";
print " deleting $file\n" if ($Verbose>=2);
unlink $file or carp "Unable to delete $file: $!";
}
closedir(OUTDIR);
}
open(TS,">$al_idx_file") or
carp "AutoSplit: unable to create timestamp file ($al_idx_file): $!";
print TS "# Index created by AutoSplit for $filename (file acts as timestamp)\n";
print TS map("sub $_ ;\n", @subnames);
close(TS);
check_unique($package, $Maxlen, 1, @names);
@names;
}
sub check_unique{
my($module, $maxlen, $warn, @names) = @_;
my(%notuniq) = ();
my(%shorts) = ();
my(@toolong) = grep(length > $maxlen, @names);
foreach(@toolong){
my($trunc) = substr($_,0,$maxlen);
$notuniq{$trunc}=1 if $shorts{$trunc};
$shorts{$trunc} = ($shorts{$trunc}) ? "$shorts{$trunc}, $_" : $_;
}
if (%notuniq && $warn){
print "$module: some names are not unique when truncated to $maxlen characters:\n";
foreach(keys %notuniq){
print " $shorts{$_} truncate to $_\n";
}
}
%notuniq;
}
1;
__END__
# test functions so AutoSplit.pm can be applied to itself:
sub test1{ "test 1\n"; }
sub test2{ "test 2\n"; }
sub test3{ "test 3\n"; }
sub test4{ "test 4\n"; }
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