use strict;
use warnings;
use base qw(Exporter);
-our @EXPORT_OK = qw(msg_timestamp);
+our @EXPORT_OK = qw(msg_timestamp msg_datestamp);
use Date::Parse qw(str2time);
use Time::Zone qw(tz_offset);
-sub msg_timestamp ($) {
+sub zone_clamp ($) {
+ my ($zone) = @_;
+ $zone ||= '+0000';
+ # "-1200" is the furthest westermost zone offset,
+ # but git fast-import is liberal so we use "-1400"
+ if ($zone >= 1400 || $zone <= -1400) {
+ warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
+ $zone = '+0000';
+ }
+ $zone;
+}
+
+sub time_response ($) {
+ my ($ret) = @_;
+ wantarray ? @$ret : $ret->[0];
+}
+
+sub msg_received_at ($) {
my ($hdr) = @_; # Email::MIME::Header
- my ($ts, $zone);
- my $mid;
my @recvd = $hdr->header_raw('Received');
+ my ($ts, $zone);
foreach my $r (@recvd) {
$zone = undef;
$r =~ /\s*(\d+\s+[[:alpha:]]+\s+\d{2,4}\s+
\d+\D\d+(?:\D\d+)\s+([\+\-]\d+))/sx or next;
$zone = $2;
$ts = eval { str2time($1) } and last;
- $mid ||= $hdr->header_raw('Message-ID');
+ my $mid = $hdr->header_raw('Message-ID');
warn "no date in $mid Received: $r\n";
}
- unless (defined $ts) {
- my @date = $hdr->header_raw('Date');
- foreach my $d (@date) {
- $zone = undef;
- $ts = eval { str2time($d) };
- if ($@) {
- $mid ||= $hdr->header_raw('Message-ID');
- warn "bad Date: $d in $mid: $@\n";
- } elsif ($d =~ /\s+([\+\-]\d+)\s*\z/) {
- $zone = $1;
- }
+ defined $ts ? [ $ts, zone_clamp($zone) ] : undef;
+}
+
+sub msg_date_only ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my @date = $hdr->header_raw('Date');
+ my ($ts, $zone);
+ foreach my $d (@date) {
+ $zone = undef;
+ # Y2K problems: 3-digit years
+ $d =~ s!([A-Za-z]{3}) (\d{3}) (\d\d:\d\d:\d\d)!
+ my $yyyy = $2 + 1900; "$1 $yyyy $3"!e;
+ $ts = eval { str2time($d) };
+ if ($@) {
+ my $mid = $hdr->header_raw('Message-ID');
+ warn "bad Date: $d in $mid: $@\n";
+ } elsif ($d =~ /\s+([\+\-]\d+)\s*\z/) {
+ $zone = $1;
}
}
- $ts = time unless defined $ts;
- return $ts unless wantarray;
+ defined $ts ? [ $ts, zone_clamp($zone) ] : undef;
+}
- $zone ||= '+0000';
- # "-1200" is the furthest westermost zone offset,
- # but git fast-import is liberal so we use "-1400"
- if ($zone >= 1400 || $zone <= -1400) {
- warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
- $zone = '+0000';
- }
- ($ts, $zone);
+# Favors Received header for sorting globally
+sub msg_timestamp ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my $ret;
+ $ret = msg_received_at($hdr) and return time_response($ret);
+ $ret = msg_date_only($hdr) and return time_response($ret);
+ wantarray ? (time, '+0000') : time;
+}
+
+# Favors the Date: header for display and sorting within a thread
+sub msg_datestamp ($) {
+ my ($hdr) = @_; # Email::MIME::Header
+ my $ret;
+ $ret = msg_date_only($hdr) and return time_response($ret);
+ $ret = msg_received_at($hdr) and return time_response($ret);
+ wantarray ? (time, '+0000') : time;
}
1;