Using a trick by fglock, and with the help of the guys at #perl.br (at freenode.org), here is the #perl.br calc, which I now use in place of bc...
Obviously, you'll see it's just a Perl Shell that have some calculator shortcuts, so, you can do whatever you want with it...
#!/usr/bin/perl
use strict;
use warnings;
use Term::ReadLine;
my $name = '#perl.br calc';
print $name.$/;
my $term = Term::ReadLine->new($name);
$term->Features()->{'autohistory'} = 1;
my $prompt = "> ";
my $OUT = $term->OUT || \*STDOUT;
my $___eval_str___;
my $M = 0;
my $scale = 2;
sub ler {
my $a = $term->readline($prompt);
unless (defined $a) {
print $/;
exit(0);
}
return $a;
}
sub substituir {
my $a = shift;
$a =~ s/^(.+)(\*\*)$/\$M $2 $1/;
$a =~ s/^(.+)(\+|\-|\*|\/)$/\$M $2 $1/;
$a =~ s/\;\s*$//;
if ($a =~ /^\s*do {\s*$/) {
my $block = '';
my $count = 1;
while (defined($_=$term->readline(' '.('.'x$count).' '
+))) {
while ($_ =~ m/\{/g) {
$count++;
}
while ($_ =~ m/\}/g) {
$count--;
}
last if $count < 1;
$block .= $_;
}
$a = 'do {'.$block.'}';
}
return $a;
}
sub falar {
my $a = shift;
if ($@) {
print "! ".$@;
} else {
if (defined $a && $a =~ /^[\d\.]$/) {
$M=sprintf("%.".$scale."f",$a);
} elsif ($a) {
$M=$a;
}
print $OUT "= ".$M.$/ if defined $M;
}
}
sub doit {
$___eval_str___ = '
eval("
falar(".substituir(ler()).");
$___eval_str___;
");
if($@){
print "! ".$@;
eval($___eval_str___)
}
';
eval $___eval_str___;
}
doit();
