view: split out reply logic into its own module

We'll be adding more reply options for centralized mailing
lists.  So split out the logic so it's easy-to-find.
Organizing code is hard :<

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/PublicInbox/Reply.pm b/lib/PublicInbox/Reply.pm
new file mode 100644
index 00000000..73a4df11
--- /dev/null
+++ b/lib/PublicInbox/Reply.pm
@@ -0,0 +1,54 @@
+# Copyright (C) 2014-2017 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+package PublicInbox::Reply;
+use strict;
+use warnings;
+use URI::Escape qw/uri_escape_utf8/;
+use PublicInbox::Hval qw/ascii_html/;
+use PublicInbox::Address;
+use PublicInbox::MID qw/mid_clean mid_escape/;
+
+sub squote_maybe ($) {
+        my ($val) = @_;
+        if ($val =~ m{([^\w@\./,\%\+\-])}) {
+                $val =~ s/(['!])/'\\$1'/g; # '!' for csh
+                return "'$val'";
+        }
+        $val;
+}
+
+sub mailto_arg_link {
+        my ($hdr) = @_;
+        my %cc; # everyone else
+        my $to; # this is the From address
+
+        foreach my $h (qw(From To Cc)) {
+                my $v = $hdr->header($h);
+                defined($v) && ($v ne '') or next;
+                my @addrs = PublicInbox::Address::emails($v);
+                foreach my $address (@addrs) {
+                        my $dst = lc($address);
+                        $cc{$dst} ||= $address;
+                        $to ||= $dst;
+                }
+        }
+        my @arg;
+
+        my $subj = $hdr->header('Subject') || '';
+        $subj = "Re: $subj" unless $subj =~ /\bRe:/i;
+        my $mid = $hdr->header_raw('Message-ID');
+        push @arg, '--in-reply-to='.squote_maybe(mid_clean($mid));
+        my $irt = mid_escape($mid);
+        delete $cc{$to};
+        push @arg, "--to=$to";
+        $to = uri_escape_utf8($to);
+        $subj = uri_escape_utf8($subj);
+        my @cc = sort values %cc;
+        push(@arg, map { "--cc=$_" } @cc);
+        my $cc = uri_escape_utf8(join(',', @cc));
+        my $href = "mailto:$to?In-Reply-To=$irt&Cc=${cc}&Subject=$subj";
+
+        (\@arg, ascii_html($href));
+}
+
+1;