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|
#!/usr/bin/perl -w
use strict;
use vars qw($Needs_Write $Verbose @Changed $TAP);
use File::Compare;
use Symbol;
use Text::Wrap;
# Common functions needed by the regen scripts
$Needs_Write = $^O eq 'cygwin' || $^O eq 'os2' || $^O eq 'MSWin32';
$Verbose = 0;
@ARGV = grep { not($_ eq '-q' and $Verbose = -1) }
grep { not($_ eq '--tap' and $TAP = 1) }
grep { not($_ eq '-v' and $Verbose = 1) } @ARGV;
END {
print STDOUT "Changed: @Changed\n" if @Changed;
}
sub safer_unlink {
my @names = @_;
my $cnt = 0;
my $name;
foreach $name (@names) {
next unless -e $name;
chmod 0777, $name if $Needs_Write;
( CORE::unlink($name) and ++$cnt
or warn "Couldn't unlink $name: $!\n" );
}
return $cnt;
}
# Open a new file.
sub open_new {
my ($final_name, $mode, $header) = @_;
my $name = $final_name . '-new';
my $lang = $final_name =~ /\.(?:c|h|tab|act)$/ ? 'C' : 'Perl';
my $fh = gensym;
if (!defined $mode or $mode eq '>') {
if (-f $name) {
unlink $name or die "$name exists but can't unlink: $!";
}
open $fh, ">$name" or die "Can't create $name: $!";
} elsif ($mode eq '>>') {
open $fh, ">>$name" or die "Can't append to $name: $!";
} else {
die "Unhandled open mode '$mode#";
}
*{$fh}->{name} = $name;
*{$fh}->{final_name} = $final_name;
*{$fh}->{lang} = $lang;
binmode $fh;
print {$fh} read_only_top(lang => $lang, %$header) if $header;
$fh;
}
sub close_and_rename {
my $fh = shift;
my $name = *{$fh}->{name};
close $fh or die "Error closing $name: $!";
my $final_name = *{$fh}->{final_name};
if ($TAP) {
my $not = compare($name, $final_name) ? 'not ' : '';
print STDOUT $not . "ok - $0 $final_name\n";
safer_unlink($name);
return;
}
if (compare($name, $final_name) == 0) {
warn "no changes between '$name' & '$final_name'\n" if $Verbose > 0;
safer_unlink($name);
return;
}
warn "changed '$name' to '$final_name'\n" if $Verbose > 0;
push @Changed, $final_name unless $Verbose < 0;
# Some dosish systems can't rename over an existing file:
safer_unlink $final_name;
chmod 0600, $name if $Needs_Write;
rename $name, $final_name or die "renaming $name to $final_name: $!";
}
sub read_only_top {
my %args = @_;
die "Missing language argument" unless defined $args{lang};
die "Unknown language argument '$args{lang}'"
unless $args{lang} eq 'Perl' or $args{lang} eq 'C';
my $style = $args{style} ? " $args{style} " : ' ';
my $raw = "-*- buffer-read-only: t -*-\n";
if ($args{file}) {
$raw .= "\n $args{file}\n";
}
if ($args{copyright}) {
local $" = ', ';
local $Text::Wrap::columns = 75;
$raw .= wrap(' ', ' ', <<"EOM") . "\n";
Copyright (C) @{$args{copyright}} by\0Larry\0Wall\0and\0others
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the README file.
EOM
}
$raw .= "!!!!!!! DO NOT EDIT THIS FILE !!!!!!!\n";
if ($args{by}) {
$raw .= "This file is built by $args{by}";
if ($args{from}) {
my @from = ref $args{from} eq 'ARRAY' ? @{$args{from}} : $args{from};
my $last = pop @from;
if (@from) {
$raw .= ' from ' . join (', ', @from) . " and $last";
} else {
$raw .= " from $last";
}
}
$raw .= ".\n";
}
$raw .= "Any changes made here will be lost!\n";
$raw .= $args{final} if $args{final};
local $Text::Wrap::columns = 78;
my $cooked = $args{lang} eq 'Perl'
? wrap('# ', '# ', $raw) . "\n" : wrap('/* ', $style, $raw) . " */\n\n";
$cooked =~ tr/\0/ /; # Don't break Larry's name etc
$cooked =~ s/ +$//mg; # Remove all trailing spaces
$cooked =~ s! \*/\n!$args{quote}!s if $args{quote};
return $cooked;
}
sub read_only_bottom_close_and_rename {
my ($fh, $sources) = @_;
my $name = *{$fh}->{name};
my $lang = *{$fh}->{lang};
die "No final name specified at open time for $name"
unless *{$fh}->{final_name};
my $comment;
if ($sources) {
$comment = "Generated from:\n";
foreach my $file (sort @$sources) {
my $digest = digest($file);
$comment .= "$digest $file\n";
}
}
$comment .= "ex: set ro:";
if (defined $lang && $lang eq 'Perl') {
$comment =~ s/^/# /mg;
} else {
$comment =~ s/^/ * /mg;
$comment =~ s! \* !/* !;
$comment .= " */";
}
print $fh "\n$comment\n";
close_and_rename($fh);
}
sub tab {
my ($l, $t) = @_;
$t .= "\t" x ($l - (length($t) + 1) / 8);
$t;
}
sub digest {
my $file = shift;
# Need to defer loading this, as the main regen scripts work back to 5.004,
# and likely we don't even have this module on every 5.8 install yet:
require Digest::SHA;
local ($/, *FH);
open FH, "$file" or die "Can't open $file: $!";
my $raw = <FH>;
close FH or die "Can't close $file: $!";
return Digest::SHA::sha256_hex($raw);
};
1;
|
