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[spider.git] / perl / DXUtil.pm

#
# various utilities which are exported globally
#
# Copyright (c) 1998 - Dirk Koopman G1TLH
#
# $Id$
#

package DXUtil;

use Date::Parse;
use IO::File;

use Carp;

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(atime ztime cldate cldatetime slat slong yesno promptf 
                         parray parraypairs shellregex readfilestr
             print_all_fields cltounix iscallsign
            );

@month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
%patmap = (
                   '*' => '.*',
                   '?' => '.',
                   '[' => '[',
                   ']' => ']'
);

# a full time for logging and other purposes
sub atime
{
        my $t = shift;
        my ($sec,$min,$hour,$mday,$mon,$year) = gmtime((defined $t) ? $t : time);
        $year += 1900;
        my $buf = sprintf "%02d%s%04d\@%02d:%02d:%02d", $mday, $month[$mon], $year, $hour, $min, $sec;
        return $buf;
}

# get a zulu time in cluster format (2300Z)
sub ztime
{
        my $t = shift;
        my ($sec,$min,$hour) = gmtime((defined $t) ? $t : time);
        $year += 1900;
        my $buf = sprintf "%02d%02dZ", $hour, $min;
        return $buf;

}

# get a cluster format date (23-Jun-1998)
sub cldate
{
        my $t = shift;
        my ($sec,$min,$hour,$mday,$mon,$year) = gmtime((defined $t) ? $t : time);
        $year += 1900;
        my $buf = sprintf "%2d-%s-%04d", $mday, $month[$mon], $year;
        return $buf;
}

# return a cluster style date time
sub cldatetime
{
        my $t = shift;
        my $date = cldate($t);
        my $time = ztime($t);
        return "$date $time";
}

# return a unix date from a cluster date and time
sub cltounix
{
        my $date = shift;
        my $time = shift;
        my ($thisyear) = (gmtime)[5] + 1900;

        return 0 unless $date =~ /^\s*(\d+)-(\w\w\w)-([12][90]\d\d)$/;
        return 0 if $3 > 2036;
        return 0 unless abs($thisyear-$3) <= 1;
        $date = "$1 $2 $3";
        return 0 unless $time =~ /^([012]\d)([012345]\d)Z$/;
        $time = "$1:$2 +0000";
        my $r = str2time("$date $time");
        return $r unless $r;
        return $r == -1 ? undef : $r;
}

# turn a latitude in degrees into a string
sub slat
{
        my $n = shift;
        my ($deg, $min, $let);
        $let = $n >= 0 ? 'N' : 'S';
        $n = abs $n;
        $deg = int $n;
        $min = int ((($n - $deg) * 60) + 0.5);
        return "$deg $min $let";
}

# turn a longitude in degrees into a string
sub slong
{
        my $n = shift;
        my ($deg, $min, $let);
        $let = $n >= 0 ? 'E' : 'W';
        $n = abs $n;
        $deg = int $n;
        $min = int ((($n - $deg) * 60) + 0.5);
        return "$deg $min $let";
}

# turn a true into 'yes' and false into 'no'
sub yesno
{
        my $n = shift;
        return $n ? $main::yes : $main::no;
}

# format a prompt with its current value and return it with its privilege
sub promptf
{
        my ($line, $value) = @_;
        my ($priv, $prompt, $action) = split ',', $line;

        # if there is an action treat it as a subroutine and replace $value
        if ($action) {
                my $q = qq{\$value = $action(\$value)};
                eval $q;
        }
        $prompt = sprintf "%15s: %s", $prompt, $value;
        return ($priv, $prompt);
}

# take an arg as an array list and print it
sub parray
{
        my $ref = shift;
        return join(', ', @{$ref});
}

# take the arg as an array reference and print as a list of pairs
sub parraypairs
{
        my $ref = shift;
        my $i;
        my $out;
  
        for ($i = 0; $i < @$ref; $i += 2) {
                my $r1 = @$ref[$i];
                my $r2 = @$ref[$i+1];
                $out .= "$r1-$r2, ";
        }
        chop $out;                                      # remove last space
        chop $out;                                      # remove last comma
        return $out;
}

# print all the fields for a record according to privilege
#
# The prompt record is of the format '<priv>,<prompt>[,<action>'
# and is expanded by promptf above
#
sub print_all_fields
{
        my $self = shift;                       # is a dxchan
        my $ref = shift;                        # is a thingy with field_prompt and fields methods defined
        my @out;
        my @fields = $ref->fields;
        my $field;

        foreach $field (sort {$ref->field_prompt($a) cmp $ref->field_prompt($b)} @fields) {
                if (defined $ref->{$field}) {
                        my ($priv, $ans) = promptf($ref->field_prompt($field), $ref->{$field});
                        push @out, $ans if ($self->priv >= $priv);
                }
        }
        return @out;
}

# generate a regex from a shell type expression 
# see 'perl cookbook' 6.9
sub shellregex
{
        my $in = shift;
        $in =~ s{(.)} { $patmap{$1} || "\Q$1" }ge;
        return '^' . $in . "\$";
}

# start an attempt at determining whether this string might be a callsign
sub iscallsign
{
        my $call = shift;
        return 1 if $call =~ /^\w+\d+/;
        return 1 if $call =~ /^\d+\w+/;
        return undef;
}

# read in a file into a string and return it. 
# the filename can be split into a dir and file and the 
# file can be in upper or lower case.
# there can also be a suffix
sub readfilestr
{
        my ($dir, $file, $suffix) = @_;
        my $fn;
        
        if ($suffix) {
                $fn = "$dir/$file.$suffix";
                unless (-e $fn) {
                        my $f = uc $file;
                        $fn = "$dir/$file.$suffix";
                }
        } elsif ($file) {
                $fn = "$dir/$file";
                unless (-e $fn) {
                        my $f = uc $file;
                        $fn = "$dir/$file";
                }
        } else {
                $fn = $dir;
        }
        my $fh = new IO::File $fn;
        my $s = undef;
        if ($fh) {
                local $/ = undef;
                $s = <$fh>;
                $fh->close;
        }
        return $s;
}