hoist MailDiff and ContentDigestDbg out of lei

These will be reused in the web UI, too.

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/PublicInbox/MailDiff.pm b/lib/PublicInbox/MailDiff.pm
new file mode 100644
index 00000000..06eb3a0d
--- /dev/null
+++ b/lib/PublicInbox/MailDiff.pm
@@ -0,0 +1,50 @@
+# Copyright (C) all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+package PublicInbox::MailDiff;
+use v5.12;
+use File::Temp 0.19 (); # 0.19 for ->newdir
+use PublicInbox::ContentHash qw(content_digest);
+use PublicInbox::ContentDigestDbg;
+use Data::Dumper ();
+use PublicInbox::MsgIter qw(msg_part_text);
+
+sub write_part { # Eml->each_part callback
+        my ($ary, $self) = @_;
+        my ($part, $depth, $idx) = @$ary;
+        if ($idx ne '1' || $self->{-raw_hdr}) {
+                open my $fh, '>', "$self->{curdir}/$idx.hdr" or die "open: $!";
+                print $fh ${$part->{hdr}} or die "print $!";
+                close $fh or die "close $!";
+        }
+        my $ct = $part->content_type || 'text/plain';
+        my ($s, $err) = msg_part_text($part, $ct);
+        my $sfx = defined($s) ? 'txt' : 'bin';
+        open my $fh, '>', "$self->{curdir}/$idx.$sfx" or die "open: $!";
+        print $fh ($s // $part->body) or die "print $!";
+        close $fh or die "close $!";
+}
+
+# public
+sub dump_eml ($$$) {
+        my ($self, $dir, $eml) = @_;
+        local $self->{curdir} = $dir;
+        mkdir $dir or die "mkdir($dir): $!";
+        $eml->each_part(\&write_part, $self);
+
+        open my $fh, '>', "$dir/content_digest" or die "open: $!";
+        my $dig = PublicInbox::ContentDigestDbg->new($fh);
+        local $Data::Dumper::Useqq = 1;
+        local $Data::Dumper::Terse = 1;
+        content_digest($eml, $dig);
+        print $fh "\n", $dig->hexdigest, "\n" or die "print $!";
+        close $fh or die "close: $!";
+}
+
+# public
+sub prep_a ($$) {
+        my ($self, $eml) = @_;
+        $self->{tmp} = File::Temp->newdir('mail-diff-XXXX', TMPDIR => 1);
+        dump_eml($self, "$self->{tmp}/a", $eml);
+}
+
+1;