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-rw-r--r--Documentation/design_www.txt1
-rw-r--r--lib/PublicInbox/View.pm65
-rw-r--r--lib/PublicInbox/WWW.pm18
3 files changed, 75 insertions, 9 deletions
diff --git a/Documentation/design_www.txt b/Documentation/design_www.txt
index 39b12414..1be4d18e 100644
--- a/Documentation/design_www.txt
+++ b/Documentation/design_www.txt
@@ -15,6 +15,7 @@ URL naming
 /$LISTNAME/$MESSAGE_ID                    -> 301 to /$LISTNAME/$MESSAGE_ID
 /$LISTNAME/$MESSAGE_ID/raw                -> raw mbox
 /$LISTNAME/$MESSAGE_ID/f/                 -> HTML content (full quotes)
+/$LISTNAME/$MESSAGE_ID/R/                 -> HTML reply instructions
 
 ### Legacy endpoints (may be ambiguous given Message-IDs with similar suffixes)
 /$LISTNAME/m/$MESSAGE_ID/                 -> 301 to /$LISTNAME/$MESSAGE_ID/
diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index c28be66d..6b81678a 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -44,6 +44,45 @@ sub msg_html {
                 '</pre></body></html>';
 }
 
+# /$LISTNAME/$MESSAGE_ID/R/
+sub msg_reply {
+        my ($ctx, $hdr, $footer) = @_;
+        my $s = $hdr->header('Subject');
+        $s = '(no subject)' if (!defined $s) || ($s eq '');
+        my $f = $hdr->header('From');
+        $f = '' unless defined $f;
+        $s = PublicInbox::Hval->new_oneline($s);
+        my $mid = $hdr->header('Message-ID');
+        $mid = PublicInbox::Hval->new_msgid($mid);
+        my $t = $s->as_html;
+        my $se_url =
+         'https://kernel.org/pub/software/scm/git/docs/git-send-email.html';
+
+        my ($arg, $link) = mailto_arg_link($hdr);
+        push @$arg, '/path/to/YOUR_REPLY';
+
+        "<html><head><title>replying to \"$t\"</title></head><body><pre>" .
+        "replying to message:\n\n" .
+        "Subject: <b>$t</b>\n" .
+        "From: ". ascii_html($f) .
+        "\nDate: " .  ascii_html($hdr->header('Date')) .
+        "\nMessage-ID: &lt;" . $mid->as_html . "&gt;\n\n" .
+        "There are multiple ways to reply:\n\n" .
+        "* Save the following mbox file, import it into your mail client,\n" .
+        "  and reply-to-all from there: <a\nhref=../raw>mbox</a>\n\n" .
+        "* Reply to all the recipients using the <b>--to</b>, <b>--cc</b>,\n" .
+        "  and <b>--in-reply-to</b> switches of git-send-email(1):\n\n" .
+        "\tgit send-email \\\n\t\t" .
+        join(" \\ \n\t\t", @$arg ). "\n\n" .
+        qq(  <a\nhref="$se_url">$se_url</a>\n\n) .
+        "* If your mail client supports setting the <b>In-Reply-To</b>" .
+        " header\n  via mailto: links, try the " .
+        qq(<a\nhref="$link">mailto: link</a>\n) .
+        "\nFor context, the original <a\nhref=../>message</a> or " .
+        qq(<a\nhref="../t/#u">thread</a>) .
+        '</pre><hr /><pre>' . $footer .  '</pre></body></html>';
+}
+
 sub feed_entry {
         my ($class, $mime, $full_pfx) = @_;
 
@@ -131,7 +170,7 @@ sub index_entry {
 
         my $txt = "${path}$href/raw";
         $rv = "\n<a\nhref=\"$mhref\">$more</a> <a\nhref=\"$txt\">raw</a> ";
-        $rv .= html_footer($hdr, 0, undef, $ctx);
+        $rv .= html_footer($hdr, 0, undef, $ctx, $mhref);
 
         if (defined $irt) {
                 unless (defined $parent_anchor) {
@@ -537,8 +576,8 @@ sub _parent_headers_nosrch {
         $rv;
 }
 
-sub html_footer {
-        my ($hdr, $standalone, $full_pfx, $ctx) = @_;
+sub mailto_arg_link {
+        my ($hdr) = @_;
         my %cc; # everyone else
         my $to; # this is the From address
 
@@ -553,24 +592,35 @@ sub html_footer {
                         $to ||= $dst;
                 }
         }
-        Email::Address->purge_cache if $standalone;
+        Email::Address->purge_cache;
+        my @arg;
 
         my $subj = $hdr->header('Subject') || '';
         $subj = "Re: $subj" unless $subj =~ /\bRe:/i;
         my $mid = $hdr->header('Message-ID');
+        push @arg, "--in-reply-to='" . ascii_html($mid) . "'";
         my $irt = uri_escape_utf8($mid);
         delete $cc{$to};
+        push @arg, '--to=' . ascii_html($to);
         $to = uri_escape_utf8($to);
         $subj = uri_escape_utf8($subj);
-
-        my $cc = uri_escape_utf8(join(',', sort values %cc));
+        my $cc = join(',', sort values %cc);
+        push @arg, '--cc=' . ascii_html($cc);
+        $cc = uri_escape_utf8($cc);
         my $href = "mailto:$to?In-Reply-To=$irt&Cc=${cc}&Subject=$subj";
         $href =~ s/%20/+/g;
 
+        (\@arg, $href);
+}
+
+sub html_footer {
+        my ($mime, $standalone, $full_pfx, $ctx, $mhref) = @_;
+
         my $srch = $ctx->{srch} if $ctx;
         my $upfx = $full_pfx ? '../' : '../../';
         my $tpfx = $full_pfx ? '' : '../';
         my $idx = $standalone ? " <a\nhref=\"$upfx\">index</a>" : '';
+        my $irt = '';
 
         if ($srch && $standalone) {
                 $idx .= qq{ / follow: <a\nhref="${tpfx}t.atom">Atom feed</a>\n};
@@ -599,7 +649,8 @@ sub html_footer {
                 $irt = '';
         }
 
-        "$irt<a\nhref=\"" . ascii_html($href) . '">reply</a>' . $idx;
+        $mhref = './' unless defined $mhref;
+        $irt . qq(<a\nhref="${mhref}R/">reply</a>) . $idx;
 }
 
 sub linkify_ref_nosrch {
diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index 77910f67..1f28df20 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -21,7 +21,7 @@ require PublicInbox::Git;
 use PublicInbox::GitHTTPBackend;
 our $LISTNAME_RE = qr!\A/([\w\.\-]+)!;
 our $MID_RE = qr!([^/]+)!;
-our $END_RE = qr!(f/|T/|t/|t\.mbox(?:\.gz)?|t\.atom|raw|)!;
+our $END_RE = qr!(f/|T/|t/|R/|t\.mbox(?:\.gz)?|t\.atom|raw|)!;
 our $pi_config;
 
 sub run {
@@ -58,7 +58,7 @@ sub run {
                 msg_page($ctx, $1, $2, $3);
 
         # in case people leave off the trailing slash:
-        } elsif ($path_info =~ m!$LISTNAME_RE/$MID_RE/(f|T|t)\z!o) {
+        } elsif ($path_info =~ m!$LISTNAME_RE/$MID_RE/(f|T|t|R)\z!o) {
                 my ($listname, $mid, $suffix) = ($1, $2, $3);
                 $suffix .= $suffix =~ /\A[tT]\z/ ? '/#u' : '/';
                 r301($ctx, $listname, $mid, $suffix);
@@ -200,6 +200,19 @@ sub get_full_html {
           [ PublicInbox::View::msg_html($ctx, $mime, undef, $foot)] ];
 }
 
+# /$LISTNAME/$MESSAGE_ID/R/                   -> HTML content (fullquotes)
+sub get_reply_html {
+        my ($ctx) = @_;
+        my $x = mid2blob($ctx) or return r404($ctx);
+
+        require PublicInbox::View;
+        my $foot = footer($ctx);
+        require Email::MIME;
+        my $hdr = Email::MIME->new($x)->header_obj;
+        [ 200, [ 'Content-Type' => 'text/html; charset=UTF-8' ],
+          [ PublicInbox::View::msg_reply($ctx, $hdr, $foot)] ];
+}
+
 # /$LISTNAME/$MESSAGE_ID/t/
 sub get_thread {
         my ($ctx, $flat) = @_;
@@ -407,6 +420,7 @@ sub msg_page {
                 'T/' eq $e and return get_thread($ctx, 1);
                 'raw' eq $e and return get_mid_txt($ctx);
                 'f/' eq $e and return get_full_html($ctx);
+                'R/' eq $e and return get_reply_html($ctx);
         }
         r404($ctx);
 }