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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 $cnt;
}
sub safer_rename_silent {
my ($from, $to) = @_;
# Some dosish systems can't rename over an existing file:
safer_unlink $to;
chmod 0600, $from if $Needs_Write;
rename $from, $to;
}
sub rename_if_different {
my ($from, $to) = @_;
if ($TAP) {
my $not = compare($from, $to) ? 'not ' : '';
print STDOUT $not . "ok - $0 $to\n";
safer_unlink($from);
return;
}
if (compare($from, $to) == 0) {
warn "no changes between '$from' & '$to'\n" if $Verbose > 0;
safer_unlink($from);
return;
}
warn "changed '$from' to '$to'\n" if $Verbose > 0;
push @Changed, $to unless $Verbose < 0;
safer_rename_silent($from, $to) or die "renaming $from to $to: $!";
}
# Saf*er*, but not totally safe. And assumes always open for output.
sub safer_open {
my ($name, $final_name) = @_;
if (-f $name) {
unlink $name or die "$name exists but can't unlink: $!";
}
my $fh = gensym;
open $fh, ">$name" or die "Can't create $name: $!";
*{$fh}->{name} = $name;
if (defined $final_name) {
*{$fh}->{final_name} = $final_name;
*{$fh}->{lang} = ($final_name =~ /\.(?:c|h|tab|act)$/ ? 'C' : 'Perl');
}
binmode $fh;
$fh;
}
sub safer_close {
my $fh = shift;
close $fh or die 'Error closing ' . *{$fh}->{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
return $cooked;
}
sub read_only_bottom_close_and_rename {
my $fh = shift;
my $name = *{$fh}->{name};
my $lang = *{$fh}->{lang};
die "No final name specified at open time for $name"
unless *{$fh}->{final_name};
print $fh $lang eq 'Perl'
? "\n# ex: set ro:\n" : "\n/* ex: set ro: */\n";
safer_close($fh);
rename_if_different($name, *{$fh}->{final_name});
}
sub tab {
my ($l, $t) = @_;
$t .= "\t" x ($l - (length($t) + 1) / 8);
$t;
}
1;
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