learn: implement "rm" only functionality

Do not consider this interface stable, but I just needed a
way to remove mis-imported multipart messages so
public-inbox-watch could pick them up again from my Maildir.

diff --git a/script/public-inbox-learn b/script/public-inbox-learn
index a696d348bd5cfc519a02cbb2c383672208a145ef..38c83243f8971e63859fe4261b7ba4d521ff2335 100755 (executable)
--- a/script/public-inbox-learn
+++ b/script/public-inbox-learn
@@ -16,7 +16,7 @@ $Email::MIME::ContentType::STRICT_PARAMS = 0; # user input is imperfect
 use PublicInbox::Address;
 use PublicInbox::Spamcheck::Spamc;
 my $train = shift or die "usage: $usage\n";
-if ($train !~ /\A(?:ham|spam)\z/) {
+if ($train !~ /\A(?:ham|spam|rm)\z/) {
        die "`$train' not recognized.\nusage: $usage\n";
 }
 
@@ -27,15 +27,18 @@ my $mime = PublicInbox::MIME->new(eval {
        local $/;
        my $data = scalar <STDIN>;
        $data =~ s/\A[\r\n]*From [^\r\n]*\r?\n//s;
-       eval {
-               if ($train eq 'ham') {
-                       $spamc->hamlearn(\$data);
-               } else {
-                       $spamc->spamlearn(\$data);
-               }
-               die "spamc failed with: $?\n" if $?;
-       };
-       $err = $@;
+
+       if ($train ne 'rm') {
+               eval {
+                       if ($train eq 'ham') {
+                               $spamc->hamlearn(\$data);
+                       } elsif ($train eq 'spam') {
+                               $spamc->spamlearn(\$data);
+                       }
+                       die "spamc failed with: $?\n" if $?;
+               };
+               $err = $@;
+       }
        $data
 });
 
@@ -61,7 +64,7 @@ foreach my $recipient (keys %dests) {
        my $email = $ENV{GIT_COMMITTER_EMAIL} || $recipient;
        my $im = PublicInbox::Import->new($git, $name, $email);
 
-       if ($train eq "spam") {
+       if ($train eq "spam" || $train eq "rm") {
                # This needs to be idempotent, as my inotify trainer
                # may train for each cross-posted message, and this
                # script already learns for every list in