[p5sagit/p5-mst-13.2.git] / lib / AutoSplit.pm

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 $Maxlen $CheckForAutoloader $CheckModTime);

=head1 NAME

AutoSplit - split a package for autoloading

=head1 SYNOPSIS

 perl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...

 use AutoSplit; autosplit($file, $dir, $keep, $check, $modtime);

for perl versions 5.002 and later:

 perl -MAutoSplit -e 'autosplit($ARGV[0], $ARGV[1], $k, $chk, $modtime)' ...

=head1 DESCRIPTION

This function will split up your program into files that the AutoLoader
module can handle. It is used by both the standard perl libraries and by
the MakeMaker utility, to automatically configure libraries for autoloading.

The C<autosplit> interface splits the specified file into a hierarchy 
rooted at the directory C<$dir>. It creates directories as needed to reflect
class hierarchy, and creates the file F<autosplit.ix>. This file acts as
both forward declaration of all package routines, and as timestamp for the
last update of the hierarchy.

The remaining three arguments to C<autosplit> govern other options to the
autosplitter. If the third argument, I<$keep>, is false, then any pre-existing
C<.al> files in the autoload directory are removed if they are no longer
part of the module (obsoleted functions). The fourth argument, I<$check>,
instructs C<autosplit> to check the module currently being split to ensure
that it does include a C<use> specification for the AutoLoader module, and
skips the module if AutoLoader is not detected. Lastly, the I<$modtime>
argument specifies that C<autosplit> is to check the modification time of the
module against that of the C<autosplit.ix> file, and only split the module
if it is newer.

Typical use of AutoSplit in the perl MakeMaker utility is via the command-line
with:

 perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'

Defined as a Make macro, it is invoked with file and directory arguments;
C<autosplit> will split the specified file into the specified directory and
delete obsolete C<.al> files, after checking first that the module does use
the AutoLoader, and ensuring that the module is not already currently split
in its current form (the modtime test).

The C<autosplit_lib_modules> form is used in the building of perl. It takes
as input a list of files (modules) that are assumed to reside in a directory
B<lib> relative to the current directory. Each file is sent to the 
autosplitter one at a time, to be split into the directory B<lib/auto>.

In both usages of the autosplitter, only subroutines defined following the
perl special marker I<__END__> are split out into separate files. Some
routines may be placed prior to this marker to force their immediate loading
and parsing.

=head1 CAVEATS

Currently, C<AutoSplit> cannot handle multiple package specifications
within one file.

=head1 DIAGNOSTICS

C<AutoSplit> will inform the user if it is necessary to create the top-level
directory specified in the invocation. It is preferred that the script or
installation process that invokes C<AutoSplit> have created the full directory
path ahead of time. This warning may indicate that the module is being split
into an incorrect path.

C<AutoSplit> will warn the user of all subroutines whose name causes potential
file naming conflicts on machines with drastically limited (8 characters or
less) file name length. Since the subroutine name is used as the file name,
these warnings can aid in portability to such systems.

Warnings are issued and the file skipped if C<AutoSplit> cannot locate either
the I<__END__> marker or a "package Name;"-style specification.

C<AutoSplit> will also emit general diagnostics for inability to create
directories or files.

=cut

# 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;
$CheckForAutoloader = 1;
$CheckModTime = 1;

$IndexFile = "autosplit.ix";	# file also serves as timestamp
$maxflen = 255;
$maxflen = 14 if $Config{'d_flexfnam'} ne 'define';
$Is_VMS = ($^O eq 'VMS');


sub autosplit{
    my($file, $autodir,  $k, $ckal, $ckmt) = @_;
    # $file    - the perl source file to be split (after __END__)
    # $autodir - the ".../auto" dir below which to write split subs
    # Handle optional flags:
    $keep = $Keep unless defined $k;
    $ckal = $CheckForAutoloader unless defined $ckal;
    $ckmt = $CheckModTime unless defined $ckmt;
    autosplit_file($file, $autodir, $keep, $ckal, $ckmt);
}


# This function is used during perl building/installation
# ./miniperl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...

sub autosplit_lib_modules{
    my(@modules) = @_; # list of Module names

    foreach(@modules){
	s#::#/#g;	# incase specified as ABC::XYZ
	s|\\|/|g;		# bug in ksh OS/2
	s#^lib/##; # incase specified as lib/*.pm
	if ($Is_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, $CheckForAutoloader, $CheckModTime);
    }
    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 $autodir;
    ($autodir = VMS::Filespec::unixpath($autodir)) =~ s#/$## if $Is_VMS;
    unless (-d $autodir){
	local($", @p)="/";
	foreach(split(/\//,$autodir)){
	    push(@p, $_);
	    next if -d "@p/";
	    mkdir("@p",0755) or die "AutoSplit unable to mkdir @p: $!";
	}
	# We should never need to create the auto dir here. installperl
	# (or similar) should have done it. Expecting it to exist is a valuable
	# sanity check against autosplitting into some random directory by mistake.
	print "Warning: AutoSplit had to create top-level $autodir unexpectedly.\n";
    }

    # 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;
    my($in_pod) = 0;
    while (<IN>) {
	# Skip pod text.
	$in_pod = 1 if /^=/;
	$in_pod = 0 if /^=cut/;
	next if ($in_pod || /^=cut/);

	# record last package name seen
	$package = $1 if (m/^\s*package\s+([\w:]+)\s*;/);
	++$autoloader_seen if m/^\s*(use|require)\s+AutoLoader\b/;
	++$autoloader_seen if m/\bISA\s*=.*\bAutoLoader\b/;
	last if /^__END__/;
    }
    if ($check_for_autoloader && !$autoloader_seen){
	print "AutoSplit skipped $filename: no AutoLoader used\n" if ($Verbose>=2);
	return 0
    }
    $_ 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
		    ($^O eq "msdos") or
	            $Is_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, %proto);
    while (<IN>) {
	if (/^package ([\w:]+)\s*;/) {
	    warn "package $1; in AutoSplit section ignored. Not currently supported.";
	}
	if (/^sub\s+([\w:]+)(\s*\(.*?\))?/) {
	    print OUT "1;\n";
	    my $subname = $1;
	    $proto{$1} = $2 or '';
	    if ($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);
	    my($deleted,$thistime);  # catch all versions on VMS
	    do { $deleted += ($thistime = unlink $file) } while ($thistime);
	    carp "Unable to delete $file: $!" unless $deleted;
	}
	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 "package $package;\n";
    print TS map("sub $_$proto{$_} ;\n", @subnames);
    print TS "1;\n";
    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"; }
Commit	Line	Data
a0d0e21e	1	package AutoSplit;
	2
	3	require 5.000;
	4	require Exporter;
	5
	6	use Config;
	7	use Carp;
	8
	9	@ISA = qw(Exporter);
	10	@EXPORT = qw(&autosplit &autosplit_lib_modules);
3edbfbe5	11	@EXPORT_OK = qw($Verbose $Keep $Maxlen $CheckForAutoloader $CheckModTime);
a0d0e21e	12
f06db76b	13	=head1 NAME
	14
	15	AutoSplit - split a package for autoloading
	16
cb1a09d0	17	=head1 SYNOPSIS
cb1a09d0	18
21c92a1d	19	perl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...
	20
	21	use AutoSplit; autosplit($file, $dir, $keep, $check, $modtime);
	22
	23	for perl versions 5.002 and later:
84dc3c4d	24
21c92a1d	25	perl -MAutoSplit -e 'autosplit($ARGV[0], $ARGV[1], $k, $chk, $modtime)' ...
cb1a09d0	26
f06db76b	27	=head1 DESCRIPTION
	28
	29	This function will split up your program into files that the AutoLoader
21c92a1d	30	module can handle. It is used by both the standard perl libraries and by
	31	the MakeMaker utility, to automatically configure libraries for autoloading.
	32
	33	The C<autosplit> interface splits the specified file into a hierarchy
	34	rooted at the directory C<$dir>. It creates directories as needed to reflect
	35	class hierarchy, and creates the file F<autosplit.ix>. This file acts as
	36	both forward declaration of all package routines, and as timestamp for the
	37	last update of the hierarchy.
	38
	39	The remaining three arguments to C<autosplit> govern other options to the
	40	autosplitter. If the third argument, I<$keep>, is false, then any pre-existing
	41	C<.al> files in the autoload directory are removed if they are no longer
	42	part of the module (obsoleted functions). The fourth argument, I<$check>,
	43	instructs C<autosplit> to check the module currently being split to ensure
	44	that it does include a C<use> specification for the AutoLoader module, and
	45	skips the module if AutoLoader is not detected. Lastly, the I<$modtime>
	46	argument specifies that C<autosplit> is to check the modification time of the
	47	module against that of the C<autosplit.ix> file, and only split the module
	48	if it is newer.
	49
	50	Typical use of AutoSplit in the perl MakeMaker utility is via the command-line
	51	with:
	52
	53	perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'
	54
	55	Defined as a Make macro, it is invoked with file and directory arguments;
	56	C<autosplit> will split the specified file into the specified directory and
	57	delete obsolete C<.al> files, after checking first that the module does use
	58	the AutoLoader, and ensuring that the module is not already currently split
	59	in its current form (the modtime test).
	60
	61	The C<autosplit_lib_modules> form is used in the building of perl. It takes
	62	as input a list of files (modules) that are assumed to reside in a directory
	63	B<lib> relative to the current directory. Each file is sent to the
	64	autosplitter one at a time, to be split into the directory B<lib/auto>.
	65
	66	In both usages of the autosplitter, only subroutines defined following the
	67	perl special marker I<__END__> are split out into separate files. Some
	68	routines may be placed prior to this marker to force their immediate loading
	69	and parsing.
	70
	71	=head1 CAVEATS
	72
	73	Currently, C<AutoSplit> cannot handle multiple package specifications
	74	within one file.
	75
	76	=head1 DIAGNOSTICS
	77
	78	C<AutoSplit> will inform the user if it is necessary to create the top-level
	79	directory specified in the invocation. It is preferred that the script or
	80	installation process that invokes C<AutoSplit> have created the full directory
	81	path ahead of time. This warning may indicate that the module is being split
	82	into an incorrect path.
	83
	84	C<AutoSplit> will warn the user of all subroutines whose name causes potential
	85	file naming conflicts on machines with drastically limited (8 characters or
	86	less) file name length. Since the subroutine name is used as the file name,
	87	these warnings can aid in portability to such systems.
	88
	89	Warnings are issued and the file skipped if C<AutoSplit> cannot locate either
	90	the I<__END__> marker or a "package Name;"-style specification.
	91
	92	C<AutoSplit> will also emit general diagnostics for inability to create
	93	directories or files.
f06db76b	94
	95	=cut
	96
a0d0e21e	97	# for portability warn about names longer than $maxlen
	98	$Maxlen = 8; # 8 for dos, 11 (14-".al") for SYSVR3
	99	$Verbose = 1; # 0=none, 1=minimal, 2=list .al files
	100	$Keep = 0;
3edbfbe5	101	$CheckForAutoloader = 1;
3edbfbe5	102	$CheckModTime = 1;
a0d0e21e	103
3edbfbe5	104	$IndexFile = "autosplit.ix"; # file also serves as timestamp
a0d0e21e	105	$maxflen = 255;
a0d0e21e	106	$maxflen = 14 if $Config{'d_flexfnam'} ne 'define';
c6538b72	107	$Is_VMS = ($^O eq 'VMS');
a0d0e21e	108
3edbfbe5	109
a0d0e21e	110	sub autosplit{
75f92628	111	my($file, $autodir, $k, $ckal, $ckmt) = @_;
	112	# $file - the perl source file to be split (after __END__)
	113	# $autodir - the ".../auto" dir below which to write split subs
	114	# Handle optional flags:
	115	$keep = $Keep unless defined $k;
	116	$ckal = $CheckForAutoloader unless defined $ckal;
	117	$ckmt = $CheckModTime unless defined $ckmt;
	118	autosplit_file($file, $autodir, $keep, $ckal, $ckmt);
a0d0e21e	119	}
	120
	121
a0d0e21e	122	# This function is used during perl building/installation
21c92a1d	123	# ./miniperl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...
a0d0e21e	124
	125	sub autosplit_lib_modules{
	126	my(@modules) = @_; # list of Module names
	127
	128	foreach(@modules){
	129	s#::#/#g; # incase specified as ABC::XYZ
4633a7c4	130	s\|\\\|/\|g; # bug in ksh OS/2
a0d0e21e	131	s#^lib/##; # incase specified as lib/*.pm
c6538b72	132	if ($Is_VMS && /[:>\]]/) { # may need to convert VMS-style filespecs
a0d0e21e	133	my ($dir,$name) = (/(.])(.)/);
	134	$dir =~ s/.*lib[\.\]]//;
	135	$dir =~ s#[\.\]]#/#g;
	136	$_ = $dir . $name;
	137	}
3edbfbe5	138	autosplit_file("lib/$_", "lib/auto", $Keep, $CheckForAutoloader, $CheckModTime);
a0d0e21e	139	}
	140	0;
	141	}
	142
	143
	144	# private functions
	145
	146	sub autosplit_file{
	147	my($filename, $autodir, $keep, $check_for_autoloader, $check_mod_time) = @_;
	148	my(@names);
	149
	150	# where to write output files
	151	$autodir = "lib/auto" unless $autodir;
c6538b72	152	($autodir = VMS::Filespec::unixpath($autodir)) =~ s#/$## if $Is_VMS;
3edbfbe5	153	unless (-d $autodir){
	154	local($", @p)="/";
	155	foreach(split(/\//,$autodir)){
	156	push(@p, $_);
	157	next if -d "@p/";
	158	mkdir("@p",0755) or die "AutoSplit unable to mkdir @p: $!";
	159	}
	160	# We should never need to create the auto dir here. installperl
	161	# (or similar) should have done it. Expecting it to exist is a valuable
	162	# sanity check against autosplitting into some random directory by mistake.
	163	print "Warning: AutoSplit had to create top-level $autodir unexpectedly.\n";
	164	}
a0d0e21e	165
	166	# allow just a package name to be used
	167	$filename .= ".pm" unless ($filename =~ m/\.pm$/);
	168
	169	open(IN, "<$filename") \|\| die "AutoSplit: Can't open $filename: $!\n";
	170	my($pm_mod_time) = (stat($filename))[9];
	171	my($autoloader_seen) = 0;
f06db76b	172	my($in_pod) = 0;
a0d0e21e	173	while (<IN>) {
f06db76b	174	# Skip pod text.
	175	$in_pod = 1 if /^=/;
	176	$in_pod = 0 if /^=cut/;
	177	next if ($in_pod \|\| /^=cut/);
	178
a0d0e21e	179	# record last package name seen
a0d0e21e	180	$package = $1 if (m/^\spackage\s+([\w:]+)\s;/);
3edbfbe5	181	++$autoloader_seen if m/^\s*(use\|require)\s+AutoLoader\b/;
a0d0e21e	182	++$autoloader_seen if m/\bISA\s=.\bAutoLoader\b/;
	183	last if /^__END__/;
	184	}
3edbfbe5	185	if ($check_for_autoloader && !$autoloader_seen){
	186	print "AutoSplit skipped $filename: no AutoLoader used\n" if ($Verbose>=2);
	187	return 0
	188	}
a0d0e21e	189	$_ or die "Can't find __END__ in $filename\n";
	190
	191	$package or die "Can't find 'package Name;' in $filename\n";
	192
	193	my($modpname) = $package; $modpname =~ s#::#/#g;
	194	my($al_idx_file) = "$autodir/$modpname/$IndexFile";
	195
	196	die "Package $package does not match filename $filename"
	197	unless ($filename =~ m/$modpname.pm$/ or
55497cff	198	($^O eq "msdos") or
c6538b72	199	$Is_VMS && $filename =~ m/$modpname.pm/i);
a0d0e21e	200
	201	if ($check_mod_time){
	202	my($al_ts_time) = (stat("$al_idx_file"))[9] \|\| 1;
	203	if ($al_ts_time >= $pm_mod_time){
	204	print "AutoSplit skipped ($al_idx_file newer that $filename)\n"
	205	if ($Verbose >= 2);
	206	return undef; # one undef, not a list
	207	}
	208	}
	209
	210	my($from) = ($Verbose>=2) ? "$filename => " : "";
	211	print "AutoSplitting $package ($from$autodir/$modpname)\n"
	212	if $Verbose;
	213
	214	unless (-d "$autodir/$modpname"){
	215	local($", @p)="/";
	216	foreach(split(/\//,"$autodir/$modpname")){
	217	push(@p, $_);
42793c05	218	next if -d "@p/";
a0d0e21e	219	mkdir("@p",0777) or die "AutoSplit unable to mkdir @p: $!";
	220	}
	221	}
	222
	223	# We must try to deal with some SVR3 systems with a limit of 14
	224	# characters for file names. Sadly we cannot simply truncate all
	225	# file names to 14 characters on these systems because we must
	226	# create filenames which exactly match the names used by AutoLoader.pm.
	227	# This is a problem because some systems silently truncate the file
	228	# names while others treat long file names as an error.
	229
	230	# We do not yet deal with multiple packages within one file.
	231	# Ideally both of these styles should work.
	232	#
	233	# package NAME;
	234	# __END__
	235	# sub AAA { ... }
	236	# package NAME::option1;
	237	# sub BBB { ... }
	238	# package NAME::option2;
	239	# sub BBB { ... }
	240	#
	241	# package NAME;
	242	# __END__
	243	# sub AAA { ... }
	244	# sub NAME::option1::BBB { ... }
	245	# sub NAME::option2::BBB { ... }
	246	#
	247	# For now both of these produce warnings.
	248
	249	open(OUT,">/dev/null") \|\| open(OUT,">nla0:"); # avoid 'not opened' warning
4633a7c4	250	my(@subnames, %proto);
a0d0e21e	251	while (<IN>) {
	252	if (/^package ([\w:]+)\s*;/) {
	253	warn "package $1; in AutoSplit section ignored. Not currently supported.";
	254	}
4633a7c4	255	if (/^sub\s+([\w:]+)(\s\(.?\))?/) {
a0d0e21e	256	print OUT "1;\n";
4633a7c4	257	my $subname = $1;
4633a7c4	258	$proto{$1} = $2 or '';
a0d0e21e	259	if ($subname =~ m/::/){
	260	warn "subs with package names not currently supported in AutoSplit section";
	261	}
	262	push(@subnames, $subname);
	263	my($lname, $sname) = ($subname, substr($subname,0,$maxflen-3));
	264	my($lpath) = "$autodir/$modpname/$lname.al";
	265	my($spath) = "$autodir/$modpname/$sname.al";
	266	unless(open(OUT, ">$lpath")){
	267	open(OUT, ">$spath") or die "Can't create $spath: $!\n";
	268	push(@names, $sname);
	269	print " writing $spath (with truncated name)\n"
	270	if ($Verbose>=1);
	271	}else{
	272	push(@names, $lname);
	273	print " writing $lpath\n" if ($Verbose>=2);
	274	}
	275	print OUT "# NOTE: Derived from $filename. ",
	276	"Changes made here will be lost.\n";
	277	print OUT "package $package;\n\n";
	278	}
	279	print OUT $_;
	280	}
	281	print OUT "1;\n";
	282	close(OUT);
	283	close(IN);
	284
	285	if (!$keep){ # don't keep any obsolete *.al files in the directory
	286	my(%names);
	287	@names{@names} = @names;
	288	opendir(OUTDIR,"$autodir/$modpname");
	289	foreach(sort readdir(OUTDIR)){
	290	next unless /\.al$/;
	291	my($subname) = m/(.*)\.al$/;
	292	next if $names{substr($subname,0,$maxflen-3)};
	293	my($file) = "$autodir/$modpname/$_";
	294	print " deleting $file\n" if ($Verbose>=2);
f06db76b	295	my($deleted,$thistime); # catch all versions on VMS
	296	do { $deleted += ($thistime = unlink $file) } while ($thistime);
	297	carp "Unable to delete $file: $!" unless $deleted;
a0d0e21e	298	}
	299	closedir(OUTDIR);
	300	}
	301
	302	open(TS,">$al_idx_file") or
	303	carp "AutoSplit: unable to create timestamp file ($al_idx_file): $!";
	304	print TS "# Index created by AutoSplit for $filename (file acts as timestamp)\n";
f06db76b	305	print TS "package $package;\n";
4633a7c4	306	print TS map("sub $_$proto{$_} ;\n", @subnames);
f06db76b	307	print TS "1;\n";
a0d0e21e	308	close(TS);
	309
	310	check_unique($package, $Maxlen, 1, @names);
	311
	312	@names;
	313	}
	314
	315
	316	sub check_unique{
	317	my($module, $maxlen, $warn, @names) = @_;
	318	my(%notuniq) = ();
	319	my(%shorts) = ();
	320	my(@toolong) = grep(length > $maxlen, @names);
	321
	322	foreach(@toolong){
	323	my($trunc) = substr($_,0,$maxlen);
	324	$notuniq{$trunc}=1 if $shorts{$trunc};
	325	$shorts{$trunc} = ($shorts{$trunc}) ? "$shorts{$trunc}, $_" : $_;
	326	}
	327	if (%notuniq && $warn){
	328	print "$module: some names are not unique when truncated to $maxlen characters:\n";
	329	foreach(keys %notuniq){
	330	print " $shorts{$_} truncate to $_\n";
	331	}
	332	}
	333	%notuniq;
	334	}
	335
	336	1;
	337	__END__
	338
	339	# test functions so AutoSplit.pm can be applied to itself:
	340	sub test1{ "test 1\n"; }
	341	sub test2{ "test 2\n"; }
	342	sub test3{ "test 3\n"; }
	343	sub test4{ "test 4\n"; }
	344
	345