#!/usr/bin/perl
#
#  abcprog [sched]
#
# This generates a musical "program" from a schedule  which  describes
# the abc files to be combined. A single file will be produced, called
# "Out.abc" by default, and it  will  be  fed  to  abc2ps  to  produce
# "Out.ps".  You can then view it with any handy PostScript viewer, or
# print it on a PostScript printer.
#
# The sched file, which will be read from standard input if not  named
# on  the  command  line,  consists of a list of lines that look a lot
# like abc header lines.  But there are a few extras.
#
# Two of the added commnds are:
#
# < file
#   This tells abcprog to read from the named file.  If  there  is  no
#   suffix,  ".abc" will be appended.  This is similar to the "source"
#   command in perl, and #include in C.  When the end of the  file  is
#   reached, abcprog will return and continue reading from the current
#   file.
# > file
#   This tells abcprog to send subsequent output to the named file. If
#   no  suffix is given, ".abc" is added.  Also, abcprog remembers the
#   files that it writes to, and at the end, feeds each to  abc2ps  to
#   produce the corresponding ".ps" files.
# 
# AUTHOR: John Chambers <jc@trillian.mit.edu>

$| = 1;
$stat = 0;
($me = $0) =~ s".*/"";
$D = $ENV{"D_$me"} || 0;

for $l (<>) {
	if ($l =~ /#/) {
	} else {
		&cmd(chomp $l);
	}
}

exit $stat;

proc cmd {
	if ($l =~ /^<\s*(\w*)/) {
		&infile($1);
	}
}