#!/usr/bin/perl -l
use warnings;
use strict;

# [id://11121105]
# as suggested, have file() return an object which overloads > and >>, so you can overwrite and append
#   "value" > file('to_overwrite'); "value" >> file('to_append');
# or have fstream() return an object which overloads just <<, for a very c+_+-eseque
#   fstream("path") << 120 << " in hexadecimal is " << ctrl::hex << 120;
END { print "="x10 };
{
    package fout;
    use autodie;
    use overload
        '>'  => \&overwrite,
        '""' => sub { \${$_[0]} },
    ;
    sub file($) { 
        print __PACKAGE__, "::file($_[0])";
        return bless \$_[0], __PACKAGE__;
    }
    sub overwrite {
        # 'value' > file($f) ==> overwrite(\$f, 'value', 1)
        my ($self, $value, $swap) = @_;
        if($swap) {
            open my $fh, '>', $$self;
            print {$fh} $value;
        } else {
            warn "not sure how to clobber scalar: `file($$self) > $value`";
        }
        return $self;
    }
}
*file = \&fout::file;

#no warnings 'void';
#file('zzz') > "value";
#fout::overwrite(file('xxx'), 'manual', 1); # this wrote the file correctly
#'blah > file(yyy)' > file('yyy'); # will this?
#print __PACKAGE__, "::";

{
    package fstream;
    use autodie;
    use overload
        '<<' => \&append,
    ;
    sub fstream($) {
        print __PACKAGE__, "::fstream($_[0])";
        return bless \$_[0], __PACKAGE__;
    }
    sub fclobber($) {
        print __PACKAGE__, "::clobber($_[0])";
        open my $fh, '>', $_[0];
        return bless \$_[0], __PACKAGE__;
    }
    sub append {
        my ($self, $value, $swap) = @_;
        if(!$swap) {
            open my $fh, '>>', $$self;
            print {$fh} $value;
        } else {
            warn "not sure how to clobber scalar: `$value << file($$self)`";
        }
        return $self;
    }
}
*fstream = \&fstream::fstream;
*fclobber = \&fstream::fclobber;

'value' << fstream('szsz');
fstream('sss') << "first";
fstream('sss') << "second" << "third";
fclobber('clb') << 'one' << 'and another';