Slight usage tweaks to piconv: show usage with

no -t -f or -l arguments, or with -h.

p4raw-id: //depot/perl@15641

diff --git a/ext/Encode/bin/piconv b/ext/Encode/bin/piconv
index 9c7cf32..cdf3ee2 100644 (file)
--- a/ext/Encode/bin/piconv
+++ b/ext/Encode/bin/piconv
@@ -9,9 +9,11 @@ my %Scheme =  map {$_ => 1} qw(from_to decode_encode perlio);
 
 use Getopt::Std;
 
-my %Opt; getopts("DS:lf:t:s:", \%Opt);
+my %Opt; getopts("hDS:lf:t:s:", \%Opt);
+$Opt{h} and help();
 $Opt{l} and list_encodings();
 my $locale = $ENV{LC_CTYPE} || $ENV{LC_ALL} || $ENV{LANG};
+$Opt{f} || $Opt{t} || help();
 my $from = $Opt{f} || $locale or help("from_encoding unspecified");
 my $to   = $Opt{t} || $locale or help("to_encoding unspecified");
 $Opt{s} and Encode::from_to($Opt{s}, $from, $to) and print $Opt{s} and exit;
@@ -115,6 +117,10 @@ uses I<string> instead of file for the source of text.  Same as F<iconv>.
 Lists all available encodings to STDERR.  This feature is missing from
 F<iconv>.
 
+=item -h
+
+Show usage.
+
 =item -D
 
 Invokes debugging mode.  Primarily for Encode hackers.