#!./perl
# $Id: piconv,v 1.27 2003/06/18 09:29:02 dankogai Exp $
#
use 5.8.0;
use strict;
use Encode ;
use Encode::Alias;
my %Scheme = map {$_ => 1} qw(from_to decode_encode perlio);
use File::Basename;
my $name = basename($0);
use Getopt::Long qw(:config no_ignore_case);
my %Opt;
help()
unless
GetOptions(\%Opt,
'from|f=s',
'to|t=s',
'list|l',
'string|s=s',
'check|C=i',
'c',
'perlqq|p',
'debug|D',
'scheme|S=s',
'resolve|r=s',
'help',
);
$Opt{help} and help();
$Opt{list} and list_encodings();
my $locale = $ENV{LC_CTYPE} || $ENV{LC_ALL} || $ENV{LANG};
defined $Opt{resolve} and resolve_encoding($Opt{resolve});
$Opt{from} || $Opt{to} || help();
my $from = $Opt{from} || $locale or help("from_encoding unspecified");
my $to = $Opt{to} || $locale or help("to_encoding unspecified");
$Opt{string} and Encode::from_to($Opt{string}, $from, $to) and print $Opt{string} and exit;
my $scheme = exists $Scheme{$Opt{Scheme}} ? $Opt{Scheme} : 'from_to';
$Opt{check} ||= $Opt{c};
$Opt{perlqq} and $Opt{check} = Encode::FB_PERLQQ;
if ($Opt{debug}){
my $cfrom = Encode->getEncoding($from)->name;
my $cto = Encode->getEncoding($to)->name;
print <<"EOT";
Scheme: $scheme
From: $from => $cfrom
To: $to => $cto
EOT
}
# default
if ($scheme eq 'from_to'){
while(<>){
Encode::from_to($_, $from, $to, $Opt{check}); print;
};
# step-by-step
}elsif ($scheme eq 'decode_encode'){
while(<>){
my $decoded = decode($from, $_, $Opt{check});
my $encoded = encode($to, $decoded);
print $encoded;
};
# NI-S favorite
}elsif ($scheme eq 'perlio'){
binmode(STDIN, ":encoding($from)");
binmode(STDOUT, ":encoding($to)");
while(<>){ print; }
} else { # won't reach
die "$name: unknown scheme: $scheme";
}
sub list_encodings{
print join("\n", Encode->encodings(":all")), "\n";
exit 0;
}
sub resolve_encoding {
if (my $alias = Encode::resolve_alias($_[0])) {
print $alias, "\n";
exit 0;
} else {
warn "$name: $_[0] is not known to Encode\n";
exit 1;
}
}
sub help{
my $message = shift;
$message and print STDERR "$name error: $message\n";
print STDERR <<"EOT";
$name [-f from_encoding] [-t to_encoding] [-s string] [files...]
$name -l
$name -r encoding_alias
-l,--list
lists all available encodings
-r,--resolve encoding_alias
resolve encoding to its (Encode) canonical name
-f,--from from_encoding
when omitted, the current locale will be used
-t,--to to_encoding
when omitted, the current locale will be used
-s,--string string
"string" will be the input instead of STDIN or files
The following are mainly of interest to Encode hackers:
-D,--debug show debug information
-C N | -c | -p check the validity of the input
-S,--scheme scheme use the scheme for conversion
EOT
exit;
}
__END__
=head1 NAME
piconv -- iconv(1), reinvented in perl
=head1 SYNOPSIS
piconv [-f from_encoding] [-t to_encoding] [-s string] [files...]
piconv -l
piconv [-C N|-c|-p]
piconv -S scheme ...
piconv -r encoding
piconv -D ...
piconv -h
=head1 DESCRIPTION
B<piconv> is perl version of B<iconv>, a character encoding converter
widely available for various Unixen today. This script was primarily
a technology demonstrator for Perl 5.8.0, but you can use piconv in the
place of iconv for virtually any case.
piconv converts the character encoding of either STDIN or files
specified in the argument and prints out to STDOUT.
Here is the list of options. Each option can be in short format (-f)
or long (--from).
=over 4
=item -f,--from from_encoding
Specifies the encoding you are converting from. Unlike B<iconv>,
this option can be omitted. In such cases, the current locale is used.
=item -t,--to to_encoding
Specifies the encoding you are converting to. Unlike B<iconv>,
this option can be omitted. In such cases, the current locale is used.
Therefore, when both -f and -t are omitted, B<piconv> just acts
like B<cat>.
=item -s,--string I<string>
uses I<string> instead of file for the source of text.
=item -l,--list
Lists all available encodings, one per line, in case-insensitive
order. Note that only the canonical names are listed; many aliases
exist. For example, the names are case-insensitive, and many standard
and common aliases work, such as "latin1" for "ISO-8859-1", or "ibm850"
instead of "cp850", or "winlatin1" for "cp1252". See L<Encode::Supported>
for a full discussion.
=item -C,--check I<N>
Check the validity of the stream if I<N> = 1. When I<N> = -1, something
interesting happens when it encounters an invalid character.
=item -c
Same as C<-C 1>.
=item -p,--perlqq
Same as C<-C -1>.
=item -h,--help
Show usage.
=item -D,--debug
Invokes debugging mode. Primarily for Encode hackers.
=item -S,--scheme scheme
Selects which scheme is to be used for conversion. Available schemes
are as follows:
=over 4
=item from_to
Uses Encode::from_to for conversion. This is the default.
=item decode_encode
Input strings are decode()d then encode()d. A straight two-step
implementation.
=item perlio
The new perlIO layer is used. NI-S' favorite.
=back
Like the I<-D> option, this is also for Encode hackers.
=back
=head1 SEE ALSO
L<iconv/1>
L<locale/3>
L<Encode>
L<Encode::Supported>
L<Encode::Alias>
L<PerlIO>
=cut