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#!/bin/sh
##############################################################################
# This is essentially a Perl program. We exec the Perl interpreter specifying
# this same file as the Perl program and use the -x option to cause the Perl
# interpreter to skip down to the Perl code. The reason we do this instead of
# just making /usr/bin/perl the script interpreter (instead of /bin/sh) is
# that the user may have multiple Perl interpreters and the one he wants to
# use is properly located in the PATH. The user's choice of Perl interpreter
# may be crucial, such as when the user also has a PERL5LIB environment
# variable and it selects modules that work with only a certain main
# interpreter program.
#
# An alternative some people use is to have /usr/bin/env as the script
# interpreter. We don't do that because we think the existence and
# compatibility of /bin/sh is more reliable.
#
# Note that we aren't concerned about efficiency because the user who needs
# high efficiency can use directly the programs that this program invokes.
#
##############################################################################
exec perl -w -x -S -- "$0" "$@"
#!/usr/bin/perl
use strict;
use Getopt::Long;
use File::Temp;
use IO::Handle;
sub pm_message($) {
STDERR->print("ppmrainbow: $_[0]\n");
}
sub pm_error($) {
pm_message($_[0]);
exit(1);
}
my ($FALSE, $TRUE) = (0,1);
(my $myname = $0) =~ s#\A.*/##;
sub doVersionHack($) {
my ($argvR) = @_;
my $arg1 = $argvR->[0];
if (defined($arg1) && (($arg1 eq "--version") || ($arg1 eq "-version"))) {
my $termStatus = system('pgmramp', '--version');
exit($termStatus == 0 ? 0 : 1);
}
}
##############################################################################
#
# MAINLINE
#
##############################################################################
doVersionHack(\@ARGV);
my ($Twid, $Thgt, $tmpdir, $repeat, $verbose);
# set defaults
$Twid = 600;
$Thgt = 8;
$tmpdir = $ENV{"TMPDIR"} || "/tmp";
$repeat = $TRUE;
$verbose = $FALSE;
GetOptions("width=i" => \$Twid,
"height=i" => \$Thgt,
"tmpdir=s" => \$tmpdir,
"repeat!" => \$repeat,
"verbose!" => \$verbose);
if ($Twid < 1 || $Thgt < 1) {
pm_error("invalid width and/or height");
}
my $verboseCommand = $verbose ? "set -x;" : "";
if (@ARGV < 1) {
pm_error("You must specify at least one color as an argument");
} elsif (@ARGV < 2 && ! $repeat) {
pm_error("With the -norepeat option, you must specify at least two colors " .
"as arguments.");
}
my @colorlist;
@colorlist = @ARGV;
if ($repeat) {
push @colorlist, $ARGV[0];
}
my $ourtmp = File::Temp::tempdir("$tmpdir/ppmrainbowXXXX", UNLINK=>1);
my $widthRemaining;
my $n;
my @outlist;
$n = 0;
$widthRemaining = $Twid;
@outlist = ();
while (@colorlist >= 2) {
my $outfile = sprintf("%s/file.%03u.ppm", $ourtmp, $n);
push(@outlist, $outfile);
my $w = int(($widthRemaining-1)/(@colorlist-1))+1;
my $rc = system("$verboseCommand pgmramp -lr $w $Thgt | " .
"pgmtoppm \"$colorlist[0]-$colorlist[1]\" >$outfile");
if ($rc != 0) {
pm_error("pgmramp|pgmtoppm pipe failed.");
}
$widthRemaining -= $w;
$n++;
shift @colorlist;
}
my $termStat =
system("$verboseCommand pamcat -leftright @outlist");
if ($termStat != 0) {
exit 1;
}
exit 0;
END {
if (@outlist) {
unlink(@outlist);
}
if (defined($ourtmp)) {
rmdir($ourtmp);
}
}