JezK
Edit File: ppmrainbow
#!/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; 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); } } sub fatal($) { my ($msg) = @_; print(STDERR "$msg\n"); exit(1); } ############################################################################## # # MAINLINE # ############################################################################## doVersionHack(\@ARGV); my ($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) { fatal("invalid width and/or height"); } my $verboseCommand = $verbose ? "set -x;" : ""; if (@ARGV < 1) { fatal("You must specify at least one color as an argument"); } elsif (@ARGV < 2 && ! $repeat) { fatal("With the -norepeat option, you must specify at least two colors " . "as arguments."); } my @colorlist; @colorlist = @ARGV; if ($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) { fatal("pgmramp|pgmtoppm failed."); } $widthRemaining -= $w; $n++; shift @colorlist; } 0 == system qq{$verboseCommand pnmcat -lr @outlist} or exit 1; exit 0; END { if (@outlist) { unlink(@outlist); } if (defined($ourtmp)) { rmdir($ourtmp); } }