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- # Copyright 2001 Free Software Foundation, Inc.
-
- # This program is free software; you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation; either version 2, or (at your option)
- # any later version.
-
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
-
- # You should have received a copy of the GNU General Public License
- # along with this program; if not, write to the Free Software
- # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- # 02111-1307, USA.
-
- package Automake::General;
-
- use 5.005;
- use Exporter;
- use File::Basename;
- use File::stat;
- use IO::File;
- use Carp;
- use strict;
-
- use vars qw (@ISA @EXPORT);
-
- @ISA = qw (Exporter);
- @EXPORT = qw (&debug &find_configure_ac &find_file &getopt &mktmpdir &mtime
- &uniq &update_file &verbose &xsystem
- $debug $help $me $tmp $verbose $version);
-
- # Variable we share with the main package. Be sure to have a single
- # copy of them: using `my' together with multiple inclusion of this
- # package would introduce several copies.
- use vars qw ($debug);
- $debug = 0;
-
- use vars qw ($help);
- $help = undef;
-
- use vars qw ($me);
- $me = basename ($0);
-
- # Our tmp dir.
- use vars qw ($tmp);
- $tmp = undef;
-
- use vars qw ($verbose);
- $verbose = 0;
-
- use vars qw ($version);
- $version = undef;
-
-
- # END
- # ---
- # Exit nonzero whenever closing STDOUT fails.
- # Ideally we should `exit ($? >> 8)', unfortunately, for some reason
- # I don't understand, whenever we `exit (1)' somewhere in the code,
- # we arrive here with `$? = 29'. I suspect some low level END routine
- # might be responsible. In this case, be sure to exit 1, not 29.
- sub END
- {
- my $exit_status = $? ? 1 : 0;
-
- use POSIX qw (_exit);
-
- if (!$debug && defined $tmp && -d $tmp)
- {
- if (<$tmp/*>)
- {
- unlink <$tmp/*>
- or carp ("$me: cannot empty $tmp: $!\n"), _exit (1);
- }
- rmdir $tmp
- or carp ("$me: cannot remove $tmp: $!\n"), _exit (1);
- }
-
- # This is required if the code might send any output to stdout
- # E.g., even --version or --help. So it's best to do it unconditionally.
- close STDOUT
- or (carp "$me: closing standard output: $!\n"), _exit (1);
-
- _exit ($exit_status);
- }
-
-
- # debug(@MESSAGE)
- # ---------------
- # Messages displayed only if $DEBUG and $VERBOSE.
- sub debug (@)
- {
- print STDERR "$me: ", @_, "\n"
- if $verbose && $debug;
- }
-
-
- # $CONFIGURE_AC
- # &find_configure_ac ()
- # ---------------------
- sub find_configure_ac ()
- {
- if (-f 'configure.ac')
- {
- if (-f 'configure.in')
- {
- carp "warning: `configure.ac' and `configure.in' both present.\n";
- carp "warning: proceeding with `configure.ac'.\n";
- }
- return 'configure.ac';
- }
- elsif (-f 'configure.in')
- {
- return 'configure.in';
- }
- return;
- }
-
-
- # $FILENAME
- # find_file ($FILENAME, @INCLUDE)
- # -------------------------------
- # We match exactly the behavior of GNU m4: first look in the current
- # directory (which includes the case of absolute file names), and, if
- # the file is not absolute, just fail. Otherwise, look in the path.
- #
- # If the file is flagged as optional (ends with `?'), then return undef
- # if absent.
- sub find_file ($@)
- {
- use File::Spec;
-
- my ($filename, @include) = @_;
- my $optional = 0;
-
- $optional = 1
- if $filename =~ s/\?$//;
-
- return File::Spec->canonpath ($filename)
- if -e $filename;
-
- if (File::Spec->file_name_is_absolute ($filename))
- {
- die "$me: no such file or directory: $filename\n"
- unless $optional;
- return undef;
- }
-
- foreach my $path (reverse @include)
- {
- return File::Spec->canonpath (File::Spec->catfile ($path, $filename))
- if -e File::Spec->catfile ($path, $filename)
- }
-
- die "$me: no such file or directory: $filename\n"
- unless $optional;
-
- return undef;
- }
-
-
- # getopt (%OPTION)
- # ----------------
- # Handle the %OPTION, plus all the common options.
- # Work around Getopt bugs wrt `-'.
- sub getopt (%)
- {
- my (%option) = @_;
- use Getopt::Long;
-
- # F*k. Getopt seems bogus and dies when given `-' with `bundling'.
- # If fixed some day, use this: '' => sub { push @ARGV, "-" }
- my $stdin = grep /^-$/, @ARGV;
- @ARGV = grep !/^-$/, @ARGV;
- %option = (%option,
- "h|help" => sub { print $help; exit 0 },
- "V|version" => sub { print $version; exit 0 },
-
- "v|verbose" => \$verbose,
- "d|debug" => \$debug,
- );
- Getopt::Long::Configure ("bundling");
- GetOptions (%option)
- or exit 1;
-
- push @ARGV, '-'
- if $stdin;
- }
-
-
- # mktmpdir ($SIGNATURE)
- # ---------------------
- # Create a temporary directory which name is based on $SIGNATURE.
- sub mktmpdir ($)
- {
- my ($signature) = @_;
- my $TMPDIR = $ENV{'TMPDIR'} || '/tmp';
-
- # If mktemp supports dirs, use it.
- $tmp = `(umask 077 &&
- mktemp -d -q "$TMPDIR/${signature}XXXXXX") 2>/dev/null`;
- chomp $tmp;
-
- if (!$tmp || ! -d $tmp)
- {
- $tmp = "$TMPDIR/$signature" . int (rand 10000) . ".$$";
- mkdir $tmp, 0700
- or croak "$me: cannot create $tmp: $!\n";
- }
-
- print STDERR "$me:$$: working in $tmp\n"
- if $debug;
- }
-
-
- # $MTIME
- # MTIME ($FILE)
- # -------------
- # Return the mtime of $FILE. Missing files, or `-' standing for STDIN
- # or STDOUT are ``obsolete'', i.e., as old as possible.
- sub mtime ($)
- {
- my ($file) = @_;
-
- return 0
- if $file eq '-' || ! -f $file;
-
- my $stat = stat ($file)
- or croak "$me: cannot stat $file: $!\n";
-
- return $stat->mtime;
- }
-
-
- # @RES
- # uniq (@LIST)
- # ------------
- # Return LIST with no duplicates.
- sub uniq (@)
- {
- my @res = ();
- my %seen = ();
- foreach my $item (@_)
- {
- if (! exists $seen{$item})
- {
- $seen{$item} = 1;
- push (@res, $item);
- }
- }
- return wantarray ? @res : "@res";
- }
-
-
- # &update_file ($FROM, $TO)
- # -------------------------
- # Rename $FROM as $TO, preserving $TO timestamp if it has not changed.
- # Recognize `$TO = -' standing for stdin.
- sub update_file ($$)
- {
- my ($from, $to) = @_;
- my $SIMPLE_BACKUP_SUFFIX = $ENV{'SIMPLE_BACKUP_SUFFIX'} || '~';
- use File::Compare;
- use File::Copy;
-
- if ($to eq '-')
- {
- my $in = new IO::File ("$from");
- my $out = new IO::File (">-");
- while ($_ = $in->getline)
- {
- print $out $_;
- }
- $in->close;
- unlink ($from)
- or die "$me: cannot not remove $from: $!\n";
- return;
- }
-
- if (-f "$to" && compare ("$from", "$to") == 0)
- {
- # File didn't change, so don't update its mod time.
- print STDERR "$me: `$to' is unchanged\n";
- return
- }
-
- if (-f "$to")
- {
- # Back up and install the new one.
- move ("$to", "$to$SIMPLE_BACKUP_SUFFIX")
- or die "$me: cannot not backup $to: $!\n";
- move ("$from", "$to")
- or die "$me: cannot not rename $from as $to: $!\n";
- print STDERR "$me: `$to' is updated\n";
- }
- else
- {
- move ("$from", "$to")
- or die "$me: cannot not rename $from as $to: $!\n";
- print STDERR "$me: `$to' is created\n";
- }
- }
-
-
- # verbose(@MESSAGE)
- # -----------------
- sub verbose (@)
- {
- print STDERR "$me: ", @_, "\n"
- if $verbose;
- }
-
-
- # xsystem ($COMMAND)
- # ------------------
- sub xsystem ($)
- {
- my ($command) = @_;
-
- verbose "running: $command";
-
- (system $command) == 0
- or croak ("$me: "
- . (split (' ', $command))[0]
- . " failed with exit status: "
- . ($? >> 8)
- . "\n");
- }
-
-
- 1; # for require
-