=head1 NAME

public-inbox-watch - mailbox watcher for public-inbox

=head1 SYNOPSIS

B<public-inbox-watch>

In ~/.public-inbox/config:

	[publicinbox "test"]
		; generic public-inbox-config keys:
		address = test@example.com
		url = http://example.com/test
		inboxdir = /path/to/test.example.com.git

		; config keys specific to public-inbox-watch:

		watch = maildir:/path/to/maildirs/.INBOX.test/

		; optional, emails that don't have a header matching
		; value will be skipped
		watchheader = List-Id:<test.example.com>

	[publicinboxwatch]
		; optional, enable use of spamc(1) for checking:
		spamcheck = spamc

		; optional, emails marked as read which appear
		; here will be trained as spam and deleted from
		; the inboxdirs of any public-inboxes which are
		; configured for watch.
		; This is global for all publicinbox.* sections
		watchspam = maildir:/path/to/maildirs/.INBOX.spam

=head1 DESCRIPTION

public-inbox-watch allows watching a mailbox or newsgroup
for the arrival of new messages and automatically
importing them into public-inbox git repositories and indices.
public-inbox-watch is useful in situations when a user wishes to
mirror an existing mailing list, but has no access to run
L<public-inbox-mda(1)> on a server.  Unlike public-inbox-mda
which is invoked once per-message, public-inbox-watch is a
persistent process, making it faster for after-the-fact imports
of large Maildirs.

Upon startup, it scans the mailbox for new messages to be
imported while it was not running.

As of public-inbox 1.6.0, Maildirs, IMAP folders, and NNTP
newsgroups are supported.  Previous versions of public-inbox
only supported Maildirs.

public-inbox-watch should be run inside a L<screen(1)> session
or as a L<systemd(1)> service.  Errors are emitted to stderr.

=head1 OPTIONS

public-inbox-watch takes no command-line options.

=head1 CONFIGURATION

These configuration knobs should be used in the
L<public-inbox-config(5)> file

=over 8

=item publicinbox.<name>.watch

A location to watch.  public-inbox 1.5.0 and earlier only supported
C<maildir:> paths:

	[publicinbox "test"]
		watch = maildir:/path/to/maildirs/.INBOX.test/

public-inbox 1.6.0 supports C<nntp://>, C<nntps://>,
C<imap://> and C<imaps://> URLs:

		watch = nntp://news.example.com/inbox.test.group
		watch = imaps://mail.example.com/INBOX.test.foo

Default: none

=item publicinbox.<name>.watchheader

	[publicinbox "test"]
		watchheader = List-Id:<test.example.com>

If specified, L<public-inbox-watch(1)> will only process mail
matching the given header.  If specified multiple times in
public-inbox 1.5 or later, mail will be processed if it matches
any of the values.  Only the last value was used in public-inbox
1.4 and earlier.

Default: none

=item publicinboxwatch.spamcheck

This may be set to C<spamc> to enable the use of SpamAssassin
L<spamc(1)> for filtering spam before it is imported into git
history.  Other spam filtering backends may be supported in
the future.

Default: none

=item publicinboxwatch.watchspam

A Maildir to watch for confirmed spam messages to appear in.
Messages which appear in this folder with the (S)een flag
will be hidden from all configured inboxes based on Message-ID
and content matching.

Messages without the (S)een flag are not considered for hiding.
This hiding affects all configured public-inboxes in PI_CONFIG.

As with C<publicinbox.$NAME.watch>, C<imap://> and C<imaps://> URLs
are supported in public-inbox 1.6.0.

Default: none; only for L<public-inbox-watch(1)> users

=back

=head1 SIGNALS

=over 8

=item SIGHUP

Reload the config file (default: ~/.public-inbox/config)

=item SIGUSR1

Rescan all watched mailboxes.  This is done automatically after
startup.

=item SIGQUIT / SIGTERM / SIGINT

Gracefully shut down.  In-flight messages will be stored
and indexed.

=back

=head1 ENVIRONMENT

=over 8

=item PI_CONFIG

config file. default: ~/.public-inbox/config
See L<public-inbox-config(5)>

=item PERL_INLINE_DIRECTORY

This may affect any public-inbox processes, but is intended
for long-lived ones such as C<public-inbox-watch> or network
daemons.  See L<public-inbox-daemon(8)>.

=back

=head1 CONTACT

Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>

The mail archives are hosted at L<https://public-inbox.org/meta/>
and L<http://hjrcffqmbrq6wope.onion/meta/>

=head1 COPYRIGHT

Copyright 2016-2020 all contributors L<mailto:meta@public-inbox.org>

License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>

=head1 SEE ALSO

L<public-inbox-config(5)>