void-packages/srcpkgs/perl/files/update-perl-provides.pl

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2014-09-22 18:36:43 +02:00
#!/usr/bin/perl
##
## Name:
## update-perl-provides
##
## Description:
## Patch the provides list in the perl package PKGBUILD. Scan the appropriate
## directories under the perl source tree for directories containing dists
## similar to CPAN dists. Search the files in the distributions for VERSION
## strings, which are perl expressions. Filters these version strings through
## the perl interpreter, then transform the dist. names and versions into
## package names and versions. Finally, we cut out the "provides" array from the
## template and replace it with the newer version.
##
## Usage:
## update-provides.pl [path to perl source tree] [path to template]
##
## Caveats:
## The path code is not platform independent and will only work in POSIX.
##
## Changelog:
## 07/25/14 JR Updated for void.
## 06/10/14 JD Rewrite from scratch for perl 5.20.0 and ArchLinux.
##
## Authors:
## Justin "juster" Davis <jrcd83@gmail.com>
## Juan RP <xtraeme@gmail.com>
##
use warnings;
use strict;
sub err
{
print STDERR "$0: error: @_\n";
exit 1;
}
## Extract the dist. name from its containing directory.
sub path_dist
{
my($path) = @_;
$path =~ s{^.*/}{};
return $path;
}
## Create a path like $path/lib/Foo/Bar.pm for Foo::Bar.
sub lib_modpath
{
my($path, $modname) = @_;
$modname =~ s{::}{/}g;
return "$path/lib/$modname.pm";
}
## Create a path to a file in the containing directory, named after
## the last segment of the module name, with suffix attached.
sub dumb_modpath
{
my($path, $modname, $suffix) = @_;
$modname =~ s{^.*::}{};
return "$path/$modname$suffix";
}
## Find a source file contained in the directory that we can scrape the
## perl versions string from.
my %distmods = (
'PathTools' => 'Cwd',
'Scalar-List-Utils' => 'List::Util',
'IO-Compress' => 'IO::Compress::Gzip',
);
sub dist_srcpath
{
my($path) = @_;
my $distname = path_dist($path);
my $modname;
if(exists $distmods{$distname}){
$modname = $distmods{$distname};
}else{
$modname = $distname;
$modname =~ s/-/::/g;
}
my @srcpaths = (
lib_modpath($path, $modname),
dumb_modpath($path, $modname, '.pm'),
dumb_modpath($path, $modname, '_pm.PL'),
"$path/VERSION", # for podlators
);
for my $src (@srcpaths){
return $src if(-f $src);
}
return undef;
}
## Scrape the version string for the module file or Makefile.PL.
sub scrape_verln
{
my($srcpath) = @_;
open my $fh, '<', $srcpath or die "open: $!";
while(my $ln = <$fh>){
if($ln =~ s/^.*VERSION *=>? *//){
close $fh;
return $ln;
}
}
close $fh;
err("failed to find VERSION in $srcpath");
}
## Scrape the version string from the module source file.
sub scrape_modver
{
my($srcpath) = @_;
return scrape_verln($srcpath);
}
## Scrape the version string from the Makefile.PL. (for libnet)
sub scrape_mkplver
{
my($srcpath) = @_;
my $verln = scrape_verln($srcpath);
$verln =~ s/,/;/;
return $verln;
}
## Scrape the version string from a file inside the dist dir.
sub distpath_ver
{
my($distpath) = @_;
my $srcpath = dist_srcpath($distpath);
my $mkplpath = "$distpath/Makefile.PL";
if(defined $srcpath){
return scrape_modver($srcpath);
}elsif(-f $mkplpath){
return scrape_mkplver($mkplpath);
}else{
err("failed to scrape version from $distpath");
}
}
## Search the base path for the dist dirs and extract their respective
## version strings.
sub find_distvers
{
my($basepath) = @_;
opendir my $dh, $basepath or die "opendir: $!";
my @dirs = grep { -d $_ } map { "$basepath/$_" } grep { !/^[.]/ } readdir $dh;
closedir $dh;
my @distvers;
for my $dpath (@dirs){
push @distvers, [ path_dist($dpath), distpath_ver($dpath) ];
}
return @distvers;
}
## Maps an aref of dist name/perl version strings (perl expressions) to
## a package name and version string suitable for a PKGBUILD.
sub pkgspec
{
my($dist, $ver) = @$_;
## print STDOUT "dist $dist\n";
## $dist =~ tr/-/./;
#print STDOUT "1 dist $dist\n";
#$dist =~ tr/_0-9.-//cd;
#print STDOUT "2 dist $dist\n";
$ver =~ tr/././s; # only one period at a time
$ver =~ s/\A[.]|[.]\z//g; # shouldn't start or stop with a period
$ver = eval $ver;
my $rev = "_1";
my $res = "perl-$dist-$ver" . $rev;
return $res;
}
## Searches the perl source dir provided for a list of packages which
## correspond to the core distributions bundled within in.
sub perlcorepkgs
{
my($perlpath) = @_;
my @dirs = ("$perlpath/cpan", "$perlpath/dist");
my @provs;
for my $d (@dirs){
if(!-d $d){
err("$d is not a valid directory");
}
push @provs, map pkgspec, find_distvers($d);
}
return @provs;
}
## Formats the provided lines into a neatly formatted bash array. The first arg
## is the name of the bash variable to assign it to.
sub basharray
{
my $vname = shift;
## Sort entries and surround with quotes.
my @lns = sort map { qq{$_} } @_;
$lns[0] = "$vname=\"$lns[0]";
## Indent lines for OCD geeks.
if(@lns > 1){
my $ind = length($vname) + 2;
splice @lns, 1, @lns-1,
map { (' ' x $ind) . $_ } @lns[1 .. $#lns];
}
$lns[$#lns] .= '"';
return map { "$_\n" } @lns;
}
## Patch the PKGBUILD at the given path with a new provides array, overwriting
## the old one.
sub patchpb
{
my $pbpath = shift;
open my $fh, '<', $pbpath or die "open: $!";
my @lines = <$fh>;
close $fh;
my($i, $j);
for($i = 0; $i < @lines; $i++){
last if($lines[$i] =~ /^provides="/);
}
if($i == @lines){
err("failed to find provides array in xbps template");
}
for($j = $i; $j < @lines; $j++){
last if($lines[$j] =~ /["]/);
}
if($j == @lines){
err("failed to find end of provides array");
}
splice @lines, $i, $j-$i+1,
basharray('provides', grep { !/win32|next/ } @_);
## Avoid corrupting the existing template in case of a crash, etc.
if(-f "$pbpath.$$"){
err("pbpath.$$ temporary file already exists, please remove it.");
}
open $fh, '>', "$pbpath.$$" or die "open: $!";
print $fh @lines;
close $fh or die "close: $!";
rename "$pbpath.$$", "$pbpath" or die "rename: $!";
return;
}
## Program entrypoint.
sub main
{
if(@_ < 2){
print STDERR "usage: $0 [perl source path] [template path]\n";
exit 2;
}
my($perlpath, $pbpath) = @_;
if(!-f $pbpath){
err("$pbpath is not a valid file.");
}elsif(!-d $perlpath){
err("$perlpath is not a valid directory.");
}else{
patchpb($pbpath, perlcorepkgs($perlpath));
}
exit 0;
}
main(@ARGV);
# EOF