X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FLEI.pm;h=e6f763e1067869e0a7c6d3bb8a90e2b544f45e0d;hb=7fc6e30aeab9925bece4bb00f88bb91af5646aa2;hp=475af8f00899f9cd20f5f7e449280be56f783156;hpb=cc276aa9548186cd82b59cd2c8d178010ab8c79d;p=public-inbox.git

diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm
index 475af8f0..e6f763e1 100644
--- a/lib/PublicInbox/LEI.pm
+++ b/lib/PublicInbox/LEI.pm
@@ -23,18 +23,20 @@ use PublicInbox::Sigfd;
 use PublicInbox::DS qw(now dwaitpid);
 use PublicInbox::Spawn qw(spawn popen_rd);
 use PublicInbox::Lock;
+use PublicInbox::Eml;
 use Time::HiRes qw(stat); # ctime comparisons for config cache
 use File::Path qw(mkpath);
 use File::Spec;
 our $quit = \&CORE::exit;
-our ($current_lei, $errors_log, $listener, $oldset);
-my ($recv_cmd, $send_cmd);
+our ($current_lei, $errors_log, $listener, $oldset, $dir_idle,
+	$recv_cmd, $send_cmd);
 my $GLP = Getopt::Long::Parser->new;
 $GLP->configure(qw(gnu_getopt no_ignore_case auto_abbrev));
 my $GLP_PASS = Getopt::Long::Parser->new;
 $GLP_PASS->configure(qw(gnu_getopt no_ignore_case auto_abbrev pass_through));
 
 our %PATH2CFG; # persistent for socket daemon
+our $MDIR2CFGPATH; # /path/to/maildir => { /path/to/config => [ ino watches ] }
 
 # TBD: this is a documentation mechanism to show a subcommand
 # (may) pass options through to another command:
@@ -64,32 +66,43 @@ sub opt_dash ($$) {
 	($spec, '<>' => $cb, $GLP_PASS) # for Getopt::Long
 }
 
-sub rel2abs ($$) {
+# rel2abs preserves symlinks in parent, unlike abs_path
+sub rel2abs {
 	my ($self, $p) = @_;
-	return $p if index($p, '/') == 0; # already absolute
+	if (index($p, '/') == 0) { # already absolute
+		$p =~ tr!/!/!s; # squeeze redundant slashes
+		chop($p) if substr($p, -1, 1) eq '/';
+		return $p;
+	}
 	my $pwd = $self->{env}->{PWD};
+	my $cwd;
 	if (defined $pwd) {
-		my $cwd = $self->{3} // getcwd() // die "getcwd(PWD=$pwd): $!";
+		my $xcwd = $self->{3} //
+			($cwd = getcwd() // die "getcwd(PWD=$pwd): $!");
 		if (my @st_pwd = stat($pwd)) {
-			my @st_cwd = stat($cwd) or die "stat($cwd): $!";
+			my @st_cwd = stat($xcwd) or die "stat($xcwd): $!";
 			"@st_pwd[1,0]" eq "@st_cwd[1,0]" or
-				$self->{env}->{PWD} = $pwd = $cwd;
+				$self->{env}->{PWD} = $pwd = undef;
 		} else { # PWD was invalid
-			delete $self->{env}->{PWD};
-			undef $pwd;
+			$self->{env}->{PWD} = $pwd = undef;
 		}
 	}
-	$pwd //= $self->{env}->{PWD} = getcwd() // die "getcwd(PWD=$pwd): $!";
+	$pwd //= $self->{env}->{PWD} = $cwd // getcwd() // die "getcwd: $!";
 	File::Spec->rel2abs($p, $pwd);
 }
 
-sub store_path ($) {
+# abs_path resolves symlinks in parent iff all parents exist
+sub abs_path { Cwd::abs_path($_[1]) // rel2abs(@_) }
+
+sub share_path ($) { # $HOME/.local/share/lei/$FOO
 	my ($self) = @_;
 	rel2abs($self, ($self->{env}->{XDG_DATA_HOME} //
 		($self->{env}->{HOME} // '/nonexistent').'/.local/share')
-		.'/lei/store');
+		.'/lei');
 }
 
+sub store_path ($) { share_path($_[0]) . '/store' }
+
 sub _config_path ($) {
 	my ($self) = @_;
 	rel2abs($self, ($self->{env}->{XDG_CONFIG_HOME} //
@@ -104,6 +117,12 @@ sub cache_dir ($) {
 		.'/lei');
 }
 
+sub url_folder_cache {
+	my ($self) = @_;
+	require PublicInbox::SharedKV; # URI => updated_at_sec_
+	PublicInbox::SharedKV->new(cache_dir($self).'/uri_folder');
+}
+
 sub ale {
 	my ($self) = @_;
 	$self->{ale} //= do {
@@ -115,7 +134,7 @@ sub ale {
 sub index_opt {
 	# TODO: drop underscore variants everywhere, they're undocumented
 	qw(fsync|sync! jobs|j=i indexlevel|L=s compact
-	max_size|max-size=s sequential_shard|sequential-shard
+	max_size|max-size=s sequential-shard
 	batch_size|batch-size=s skip-docdata)
 }
 
@@ -124,6 +143,23 @@ my @lxs_opt = (qw(remote! local! external! include|I=s@ exclude=s@ only=s@
 	import-remote! no-torsocks torsocks=s),
 	PublicInbox::LeiQuery::curl_opt());
 
+# we don't support -C as an alias for --find-copies since it's already
+# used for chdir
+our @diff_opt = qw(unified|U=i output-indicator-new=s output-indicator-old=s
+	output-indicator-context=s indent-heuristic!
+	minimal patience histogram anchored=s@ diff-algorithm=s
+	color-moved:s color-moved-ws=s no-color-moved no-color-moved-ws
+	word-diff:s word-diff-regex=s color-words:s no-renames
+	rename-empty! check ws-error-highlight=s full-index binary
+	abbrev:i break-rewrites|B:s find-renames|M:s find-copies:s
+	find-copies-harder irreversible-delete|D l=i diff-filter=s
+	S=s G=s find-object=s pickaxe-all pickaxe-regex O=s R
+	relative:s text|a ignore-cr-at-eol ignore-space-at-eol
+	ignore-space-change|b ignore-all-space|w ignore-blank-lines
+	inter-hunk-context=i function-context|W exit-code ext-diff
+	no-ext-diff textconv! src-prefix=s dst-prefix=s no-prefix
+	line-prefix=s);
+
 # we generate shell completion + help using %CMD and %OPTDESC,
 # see lei__complete() and PublicInbox::LeiHelp
 # command => [ positional_args, 1-line description, Getopt::Long option spec ]
@@ -131,15 +167,32 @@ our %CMD = ( # sorted in order of importance/use:
 'q' => [ '--stdin|SEARCH_TERMS...', 'search for messages matching terms',
 	'stdin|', # /|\z/ must be first for lone dash
 	@lxs_opt,
-	qw(save-as=s output|mfolder|o=s format|f=s dedupe|d=s threads|t+
+	qw(save output|mfolder|o=s format|f=s dedupe|d=s threads|t+
 	sort|s=s reverse|r offset=i pretty jobs|j=s globoff|g augment|a
-	import-before! lock=s@ rsyncable alert=s@ mua=s verbose|v+), @c_opt,
-	opt_dash('limit|n=i', '[0-9]+') ],
+	import-before! lock=s@ rsyncable alert=s@ mua=s verbose|v+
+	shared color! mail-sync!), @c_opt, opt_dash('limit|n=i', '[0-9]+') ],
+
+'up' => [ 'OUTPUT|--all', 'update saved search',
+	qw(jobs|j=s lock=s@ alert=s@ mua=s verbose|v+ all:s), @c_opt ],
+
+'lcat' => [ '--stdin|MSGID_OR_URL...', 'display local copy of message(s)',
+	'stdin|', # /|\z/ must be first for lone dash
+	# some of these options are ridiculous for lcat
+	@lxs_opt, qw(output|mfolder|o=s format|f=s dedupe|d=s threads|t+
+	sort|s=s reverse|r offset=i jobs|j=s globoff|g augment|a
+	import-before! lock=s@ rsyncable alert=s@ mua=s verbose|v+
+	color!), @c_opt, opt_dash('limit|n=i', '[0-9]+') ],
 
 'blob' => [ 'OID', 'show a git blob, reconstructing from mail if necessary',
 	qw(git-dir=s@ cwd! verbose|v+ mail! oid-a|A=s path-a|a=s path-b|b=s),
 	@lxs_opt, @c_opt ],
 
+'rediff' => [ '--stdin|LOCATION...',
+		'regenerate a diff with different options',
+	'stdin|', # /|\z/ must be first for lone dash
+	qw(git-dir=s@ cwd! verbose|v+ color:s no-color),
+	@diff_opt, @lxs_opt, @c_opt ],
+
 'add-external' => [ 'LOCATION',
 	'add/set priority of a publicinbox|extindex for extra matches',
 	qw(boost=i mirror=s no-torsocks torsocks=s inbox-version=i
@@ -148,48 +201,69 @@ our %CMD = ( # sorted in order of importance/use:
 'ls-external' => [ '[FILTER]', 'list publicinbox|extindex locations',
 	qw(format|f=s z|0 globoff|g invert-match|v local remote), @c_opt ],
 'ls-label' => [ '', 'list labels', qw(z|0 stats:s), @c_opt ],
+'ls-mail-sync' => [ '[FILTER]', 'list mail sync folders',
+		qw(z|0 globoff|g invert-match|v local remote), @c_opt ],
+'ls-mail-source' => [ 'URL', 'list IMAP or NNTP mail source folders',
+		qw(z|0 ascii l url), @c_opt ],
 'forget-external' => [ 'LOCATION...|--prune',
 	'exclude further results from a publicinbox|extindex',
 	qw(prune), @c_opt ],
 
-'ls-query' => [ '[FILTER...]', 'list saved search queries',
-		qw(name-only format|f=s), @c_opt ],
-'rm-query' => [ 'QUERY_NAME', 'remove a saved search', @c_opt ],
-'mv-query' => [ qw(OLD_NAME NEW_NAME), 'rename a saved search', @c_opt ],
-
+'ls-search' => [ '[PREFIX]', 'list saved search queries',
+		qw(format|f=s pretty l ascii z|0), @c_opt ],
+'forget-search' => [ 'OUTPUT', 'forget a saved search',
+		qw(verbose|v+), @c_opt ],
+'edit-search' => [ 'OUTPUT', "edit saved search via `git config --edit'",
+			@c_opt ],
+'rm' => [ '--stdin|LOCATION...',
+	'remove a message from the index and prevent reindexing',
+	'stdin|', # /|\z/ must be first for lone dash
+	@c_opt ],
 'plonk' => [ '--threads|--from=IDENT',
 	'exclude mail matching From: or threads from non-Message-ID searches',
 	qw(stdin| threads|t from|f=s mid=s oid=s), @c_opt ],
 'tag' => [ 'KEYWORDS...',
 	'set/unset keywords and/or labels on message(s)',
-	qw(stdin| in-format|F=s input|i=s@ oid=s@ mid=s@), @c_opt,
+	qw(stdin| in-format|F=s input|i=s@ oid=s@ mid=s@),
+	qw(no-torsocks torsocks=s), PublicInbox::LeiQuery::curl_opt(), @c_opt,
 	pass_through('-kw:foo for delete') ],
-'forget' => [ '[--stdin|--oid=OID|--by-mid=MID]',
-	"exclude message(s) on stdin from `q' search results",
-	qw(stdin| oid=s exact by-mid|mid:s), @c_opt ],
 
 'purge-mailsource' => [ 'LOCATION|--all',
 	'remove imported messages from IMAP, Maildirs, and MH',
 	qw(exact! all jobs:i indexed), @c_opt ],
 
-'add-watch' => [ 'LOCATION', 'watch for new messages and flag changes',
-	qw(import! kw|keywords|flags! interval=s recursive|r
-	exclude=s include=s), @c_opt ],
+'add-watch' => [ 'LOCATION...', 'watch for new messages and flag changes',
+	qw(poll-interval=s state=s recursive|r), @c_opt ],
+'rm-watch' => [ 'LOCATION...', 'remove specified watch(es)',
+	qw(recursive|r), @c_opt ],
 'ls-watch' => [ '[FILTER...]', 'list active watches with numbers and status',
-		qw(format|f=s z), @c_opt ],
+		qw(l z|0), @c_opt ],
 'pause-watch' => [ '[WATCH_NUMBER_OR_FILTER]', qw(all local remote), @c_opt ],
 'resume-watch' => [ '[WATCH_NUMBER_OR_FILTER]', qw(all local remote), @c_opt ],
 'forget-watch' => [ '{WATCH_NUMBER|--prune}', 'stop and forget a watch',
 	qw(prune), @c_opt ],
 
+'index' => [ 'LOCATION...', 'one-time index from URL or filesystem',
+	qw(in-format|F=s kw! offset=i recursive|r exclude=s include|I=s
+	verbose|v+ incremental!),
+	 PublicInbox::LeiQuery::curl_opt(), # mainly for --proxy=
+	 @c_opt ],
 'import' => [ 'LOCATION...|--stdin',
 	'one-time import/update from URL or filesystem',
-	qw(stdin| offset=i recursive|r exclude=s include|I=s
-	lock=s@ in-format|F=s kw|keywords|flags! verbose|v+), @c_opt ],
+	qw(stdin| offset=i recursive|r exclude=s include|I=s jobs=s new-only
+	lock=s@ in-format|F=s kw! verbose|v+ incremental! mail-sync!),
+	qw(no-torsocks torsocks=s), PublicInbox::LeiQuery::curl_opt(), @c_opt ],
+'forget-mail-sync' => [ 'LOCATION...',
+	'forget sync information for a mail folder', @c_opt ],
+'prune-mail-sync' => [ 'LOCATION...|--all',
+	'prune dangling sync data for a mail folder', 'all:s', @c_opt ],
+'export-kw' => [ 'LOCATION...|--all',
+	'one-time export of keywords of sync sources',
+	qw(all:s mode=s), @c_opt ],
 'convert' => [ 'LOCATION...|--stdin',
 	'one-time conversion from URL or filesystem to another format',
-	qw(stdin| in-format|F=s out-format|f=s output|mfolder|o=s
-	lock=s@ kw|keywords|flags!), @c_opt ],
+	qw(stdin| in-format|F=s out-format|f=s output|mfolder|o=s lock=s@ kw!),
+	qw(no-torsocks torsocks=s), PublicInbox::LeiQuery::curl_opt(), @c_opt ],
 'p2q' => [ 'FILE|COMMIT_OID|--stdin',
 	"use a patch to generate a query for `lei q --stdin'",
 	qw(stdin| want|w=s@ uri debug), @c_opt ],
@@ -197,6 +271,9 @@ our %CMD = ( # sorted in order of importance/use:
 		'git-config(1) wrapper for '._config_path($_[0]);
 	}, qw(config-file|system|global|file|f=s), # for conflict detection
 	 qw(c=s@ C=s@), pass_through('git config') ],
+'inspect' => [ 'ITEMS...', 'inspect lei/store and/or local external',
+	qw(pretty ascii dir=s), @c_opt ],
+
 'init' => [ '[DIRNAME]', sub {
 	"initialize storage, default: ".store_path($_[0]);
 	}, @c_opt ],
@@ -206,13 +283,12 @@ our %CMD = ( # sorted in order of importance/use:
 'daemon-pid' => [ '', 'show the PID of the lei-daemon' ],
 'help' => [ '[SUBCOMMAND]', 'show help' ],
 
-# XXX do we need this?
-# 'git' => [ '[ANYTHING...]', 'git(1) wrapper', pass_through('git') ],
-
-'reorder-local-store-and-break-history' => [ '[REFNAME]',
-	'rewrite git history in an attempt to improve compression',
-	qw(gc!), @c_opt ],
-
+# TODO
+#'reorder-local-store-and-break-history' => [ '[REFNAME]',
+#	'rewrite git history in an attempt to improve compression',
+#	qw(gc!), @c_opt ],
+#'fuse-mount' => [ 'PATHNAME', 'expose lei/store as Maildir(s)', @c_opt ],
+#
 # internal commands are prefixed with '_'
 '_complete' => [ '[...]', 'internal shell completion helper',
 		pass_through('everything') ],
@@ -236,8 +312,11 @@ my %OPTDESC = (
 'lock=s@' => [ 'METHOD|dotlock|fcntl|flock|none',
 	'mbox(5) locking method(s) to use (default: fcntl,dotlock)' ],
 
+'incremental!	import' => 'import already seen IMAP and NNTP articles',
 'globoff|g' => "do not match locations using '*?' wildcards ".
 		"and\xa0'[]'\x{a0}ranges",
+'invert-match|v' => 'select non-matching lines',
+'color!' => 'disable color (for --format=text)',
 'verbose|v+' => 'be more verbose',
 'external!' => 'do not use externals',
 'mail!' => 'do not look in mail storage for OID',
@@ -246,10 +325,13 @@ my %OPTDESC = (
 'path-a|a=s' => 'pre-image pathname associated with OID',
 'path-b|b=s' => 'post-image pathname associated with OID',
 'git-dir=s@' => 'additional git repository to scan',
+'dir=s	inspect' => 'specify a inboxdir, extindex topdir or Xapian shard',
+'proxy=s' => [ 'PROTO://HOST[:PORT]', # shared with curl(1)
+	"proxy for (e.g. `socks5h://0:9050')" ],
 'torsocks=s' => ['VAL|auto|no|yes',
 		'whether or not to wrap git and curl commands with torsocks'],
 'no-torsocks' => 'alias for --torsocks=no',
-'save-as=s' => ['NAME', 'save a search terms by given name'],
+'save' =>  "save a search for `lei up'",
 'import-remote!' => 'do not memoize remote messages into local store',
 
 'type=s' => [ 'any|mid|git', 'disambiguate type' ],
@@ -274,6 +356,7 @@ my %OPTDESC = (
 	"or\xa0`-'\x{a0}for\x{a0}stdout)" ],
 'mua=s' => [ 'CMD',
 	"MUA to run on --output Maildir or mbox (e.g.\xa0`mutt\xa0-f\xa0%f')" ],
+'new-only	import' => 'only import new messages from IMAP source',
 
 'inbox-version=i' => [ 'NUM|1|2',
 		'force a public-inbox version with --mirror'],
@@ -288,7 +371,7 @@ my %OPTDESC = (
 	'do not index messages larger than SIZE (default: infinity)' ],
 'batch_size|batch-size=s' => [ 'SIZE',
 	'flush changes to OS after given number of bytes (default: 1m)' ],
-'sequential_shard|sequential-shard' =>
+'sequential-shard' =>
 	'index Xapian shards sequentially for slow storage',
 'skip-docdata' =>
 	'drop compatibility w/ public-inbox <1.6 to save ~1.5% space',
@@ -307,7 +390,12 @@ my %OPTDESC = (
 'jobs|j=i	add-external' => 'set parallelism when indexing after --mirror',
 
 'in-format|F=s' => $stdin_formats,
-'format|f=s	ls-query' => $ls_format,
+'format|f=s	ls-search' => ['OUT|json|jsonl|concatjson',
+			'listing output format' ],
+'l	ls-search' => 'long listing format',
+'l	ls-watch' => 'long listing format',
+'l	ls-mail-source' => 'long listing format',
+'url	ls-mail-source' => 'show full URL of newsgroup or IMAP folder',
 'format|f=s	ls-external' => $ls_format,
 
 'limit|n=i@' => ['NUM', 'limit on number of matches (default: 10000)' ],
@@ -324,6 +412,8 @@ my %OPTDESC = (
 'remote' => 'limit operations to those requiring network access',
 'remote!' => 'prevent operations requiring network access',
 
+'all:s	up' => ['local', 'update all (local) saved searches' ],
+
 'mid=s' => 'specify the Message-ID of a message',
 'oid=s' => 'specify the git object ID of a message',
 
@@ -336,7 +426,7 @@ my %OPTDESC = (
 
 'by-mid|mid:s' => [ 'MID', 'match only by Message-ID, ignoring contents' ],
 
-'kw|keywords|flags!' => 'disable/enable importing flags',
+'kw!' => 'disable/enable importing keywords (aka "flags")',
 
 # xargs, env, use "-0", git(1) uses "-z".  We support z|0 everywhere
 'z|0' => 'use NUL \\0 instead of newline (CR) to delimit lines',
@@ -348,11 +438,18 @@ my %CONFIG_KEYS = (
 	'leistore.dir' => 'top-level storage location',
 );
 
-my @WQ_KEYS = qw(lxs l2m imp mrr cnv p2q tag sol); # internal workers
+my @WQ_KEYS = qw(lxs l2m ikw pmd wq1 lne); # internal workers
 
 sub _drop_wq {
 	my ($self) = @_;
-	for my $wq (grep(defined, delete(@$self{@WQ_KEYS}))) { $wq->DESTROY }
+	for my $wq (grep(defined, delete(@$self{@WQ_KEYS}))) {
+		if ($wq->wq_kill) {
+			$wq->wq_close(0, undef, $self);
+		} elsif ($wq->wq_kill_old) {
+			$wq->wq_wait_old(undef, $self);
+		}
+		$wq->DESTROY;
+	}
 }
 
 # pronounced "exit": x_it(1 << 8) => exit(1); x_it(13) => SIGPIPE
@@ -361,21 +458,11 @@ sub x_it ($$) {
 	# make sure client sees stdout before exit
 	$self->{1}->autoflush(1) if $self->{1};
 	dump_and_clear_log();
-	if (my $s = $self->{pkt_op_p} // $self->{sock}) {
-		send($s, "x_it $code", MSG_EOR);
-	} elsif ($self->{oneshot}) {
-		# don't want to end up using $? from child processes
-		_drop_wq($self);
-		# cleanup anything that has tempfiles or open file handles
-		%PATH2CFG = ();
-		delete @$self{qw(ovv dedupe sto cfg)};
-		if (my $signum = ($code & 127)) { # usually SIGPIPE (13)
-			$SIG{PIPE} = 'DEFAULT'; # $SIG{$signum} doesn't work
-			kill $signum, $$;
-			sleep(1) while 1; # wait for signal
-		} else {
-			$quit->($code >> 8);
-		}
+	stop_pager($self);
+	if ($self->{pkt_op_p}) { # to top lei-daemon
+		$self->{pkt_op_p}->pkt_do('x_it', $code);
+	} elsif ($self->{sock}) { # to lei(1) client
+		send($self->{sock}, "x_it $code", MSG_EOR);
 	} # else ignore if client disconnected
 }
 
@@ -411,9 +498,10 @@ sub sigint_reap {
 
 sub fail ($$;$) {
 	my ($self, $buf, $exit_code) = @_;
+	$self->{failed}++;
 	err($self, $buf) if defined $buf;
 	# calls fail_handler:
-	send($self->{pkt_op_p}, '!', MSG_EOR) if $self->{pkt_op_p};
+	$self->{pkt_op_p}->pkt_do('!') if $self->{pkt_op_p};
 	x_it($self, ($exit_code // 1) << 8);
 	undef;
 }
@@ -432,18 +520,17 @@ sub puts ($;@) { out(shift, map { "$_\n" } @_) }
 sub child_error { # passes non-fatal curl exit codes to user
 	my ($self, $child_error, $msg) = @_; # child_error is $?
 	$self->err($msg) if $msg;
-	if (my $s = $self->{pkt_op_p} // $self->{sock}) {
-		# send to the parent lei-daemon or to lei(1) client
-		send($s, "child_error $child_error", MSG_EOR);
-	} elsif (!$PublicInbox::DS::in_loop) {
-		$self->{child_error} = $child_error;
+	if ($self->{pkt_op_p}) { # to top lei-daemon
+		$self->{pkt_op_p}->pkt_do('child_error', $child_error);
+	} elsif ($self->{sock}) { # to lei(1) client
+		send($self->{sock}, "child_error $child_error", MSG_EOR);
 	} # else noop if client disconnected
 }
 
 sub note_sigpipe { # triggers sigpipe_handler
 	my ($self, $fd) = @_;
 	close(delete($self->{$fd})); # explicit close silences Perl warning
-	send($self->{pkt_op_p}, '|', MSG_EOR) if $self->{pkt_op_p};
+	$self->{pkt_op_p}->pkt_do('|') if $self->{pkt_op_p};
 	x_it($self, 13);
 }
 
@@ -452,19 +539,15 @@ sub _lei_atfork_child {
 	# we need to explicitly close things which are on stack
 	if ($persist) {
 		chdir '/' or die "chdir(/): $!";
-		my @io = delete @$self{qw(0 1 2 sock)};
-		unless ($self->{oneshot}) {
-			close($_) for @io;
-		}
+		close($_) for (grep(defined, delete @$self{qw(0 1 2 sock)}));
 		if (my $cfg = $self->{cfg}) {
-			delete $cfg->{-lei_store};
+			delete @$cfg{qw(-lei_store -watches -lei_note_event)};
 		}
 	} else { # worker, Net::NNTP (Net::Cmd) uses STDERR directly
 		open STDERR, '+>&='.fileno($self->{2}) or warn "open $!";
+		STDERR->autoflush(1);
 	}
-	for (delete @$self{qw(3 old_1 au_done)}) {
-		close($_) if defined($_);
-	}
+	close($_) for (grep(defined, delete @$self{qw(3 old_1 au_done)}));
 	if (my $op_c = delete $self->{pkt_op_c}) {
 		close(delete $op_c->{sock});
 	}
@@ -473,9 +556,14 @@ sub _lei_atfork_child {
 	}
 	close $listener if $listener;
 	undef $listener;
+	$dir_idle->force_close if $dir_idle;
 	%PATH2CFG = ();
+	$MDIR2CFGPATH = {};
+	eval 'no warnings; undef $PublicInbox::LeiNoteEvent::to_flush';
 	undef $errors_log;
 	$quit = \&CORE::exit;
+	$self->{-eml_noisy} or # only "lei import" sets this atm
+		$SIG{__WARN__} = PublicInbox::Eml::warn_ignore_cb();
 	$current_lei = $persist ? undef : $self; # for SIG{__WARN__}
 }
 
@@ -484,8 +572,8 @@ sub _delete_pkt_op { # OnDestroy callback to prevent leaks on die
 	if (my $op = delete $self->{pkt_op_c}) { # in case of die
 		$op->close; # PublicInbox::PktOp::close
 	}
-	my $unclosed_after_die = delete($self->{pkt_op_p}) or return;
-	close $unclosed_after_die;
+	my $pkt_op_p = delete($self->{pkt_op_p}) or return;
+	close $pkt_op_p->{op_p};
 }
 
 sub pkt_op_pair {
@@ -497,18 +585,26 @@ sub pkt_op_pair {
 	$end;
 }
 
+sub incr {
+	my ($self, $field, $nr) = @_;
+	$self->{counters}->{$field} += $nr;
+}
+
 sub workers_start {
-	my ($lei, $wq, $ident, $jobs, $ops) = @_;
+	my ($lei, $wq, $jobs, $ops, $flds) = @_;
 	$ops = {
 		'!' => [ \&fail_handler, $lei ],
 		'|' => [ \&sigpipe_handler, $lei ],
 		'x_it' => [ \&x_it, $lei ],
 		'child_error' => [ \&child_error, $lei ],
+		'incr' => [ \&incr, $lei ],
 		($ops ? %$ops : ()),
 	};
-	$ops->{''} //= [ \&dclose, $lei ];
+	$ops->{''} //= [ $wq->can('_lei_wq_eof') || \&wq_eof, $lei ];
 	my $end = $lei->pkt_op_pair;
-	$wq->wq_workers_start($ident, $jobs, $lei->oldset, { lei => $lei });
+	my $ident = $wq->{-wq_ident} // "lei-$lei->{cmd} worker";
+	$flds->{lei} = $lei;
+	$wq->wq_workers_start($ident, $jobs, $lei->oldset, $flds);
 	delete $lei->{pkt_op_p};
 	my $op_c = delete $lei->{pkt_op_c};
 	@$end = ();
@@ -516,6 +612,15 @@ sub workers_start {
 	($op_c, $ops);
 }
 
+# call this when we're ready to wait on events and yield to other clients
+sub wait_wq_events {
+	my ($lei, $op_c, $ops) = @_;
+	for my $wq (grep(defined, @$lei{qw(ikw pmd)})) { # auxiliary WQs
+		$wq->wq_close(1);
+	}
+	$op_c->{ops} = $ops;
+}
+
 sub _help {
 	require PublicInbox::LeiHelp;
 	PublicInbox::LeiHelp::call($_[0], $_[1], \%CMD, \%OPTDESC);
@@ -568,7 +673,15 @@ sub optparse ($$$) {
 			my $ok;
 			for my $o (@or) {
 				if ($o =~ /\A--([a-z0-9\-]+)/) {
-					$ok = defined($OPT->{$1});
+					my $sw = $1;
+					# assume pipe/regular file on stdin
+					# w/o args means stdin
+					if ($sw eq 'stdin' && !@$argv &&
+							(-p $self->{0} ||
+							 -f _) && -r _) {
+						$OPT->{stdin} //= 1;
+					}
+					$ok = defined($OPT->{$sw});
 					last if $ok;
 				} elsif (defined($argv->[$i])) {
 					$ok = 1;
@@ -637,6 +750,7 @@ sub lazy_cb ($$$) {
 sub dispatch {
 	my ($self, $cmd, @argv) = @_;
 	local $current_lei = $self; # for __WARN__
+	$self->{2}->autoflush(1); # keep stdout buffered until x_it|DESTROY
 	dump_and_clear_log("from previous run\n");
 	return _help($self, 'no command given') unless defined($cmd);
 	# do not support Getopt bundling for this
@@ -654,11 +768,7 @@ sub dispatch {
 				next if $d eq ''; # same as git(1)
 				chdir $d or return fail($self, "cd $d: $!");
 			}
-			if (delete $self->{3}) { # update cwd for rel2abs
-				opendir my $dh, '.' or
-					return fail($self, "opendir . $!");
-				$self->{3} = $dh;
-			}
+			open $self->{3}, '.' or return fail($self, "open . $!");
 		}
 		$cb->($self, @argv);
 	} elsif (grep(/\A-/, $cmd, @argv)) { # --help or -h only
@@ -676,10 +786,12 @@ sub _lei_cfg ($;$) {
 	my $f = _config_path($self);
 	my @st = stat($f);
 	my $cur_st = @st ? pack('dd', $st[10], $st[7]) : ''; # 10:ctime, 7:size
-	my ($sto, $sto_dir);
+	my ($sto, $sto_dir, $watches, $lne);
 	if (my $cfg = $PATH2CFG{$f}) { # reuse existing object in common case
 		return ($self->{cfg} = $cfg) if $cur_st eq $cfg->{-st};
-		($sto, $sto_dir) = @$cfg{qw(-lei_store leistore.dir)};
+		($sto, $sto_dir, $watches, $lne) =
+				@$cfg{qw(-lei_store leistore.dir -watches
+					-lei_note_event)};
 	}
 	if (!@st) {
 		unless ($creat) {
@@ -693,14 +805,15 @@ sub _lei_cfg ($;$) {
 		$cur_st = pack('dd', $st[10], $st[7]);
 		qerr($self, "# $f created") if $self->{cmd} ne 'config';
 	}
-	my $cfg = PublicInbox::Config::git_config_dump($f);
-	bless $cfg, 'PublicInbox::Config';
+	my $cfg = PublicInbox::Config->git_config_dump($f);
 	$cfg->{-st} = $cur_st;
 	$cfg->{'-f'} = $f;
 	if ($sto && File::Spec->canonpath($sto_dir // store_path($self))
 			eq File::Spec->canonpath($cfg->{'leistore.dir'} //
 						store_path($self))) {
 		$cfg->{-lei_store} = $sto;
+		$cfg->{-lei_note_event} = $lne;
+		$cfg->{-watches} = $watches if $watches;
 	}
 	if (scalar(keys %PATH2CFG) > 5) {
 		# FIXME: use inotify/EVFILT_VNODE to detect unlinked configs
@@ -709,11 +822,13 @@ sub _lei_cfg ($;$) {
 		}
 	}
 	$self->{cfg} = $PATH2CFG{$f} = $cfg;
+	refresh_watches($self);
+	$cfg;
 }
 
 sub _lei_store ($;$) {
 	my ($self, $creat) = @_;
-	my $cfg = _lei_cfg($self, $creat);
+	my $cfg = _lei_cfg($self, $creat) // return;
 	$cfg->{-lei_store} //= do {
 		require PublicInbox::LeiStore;
 		my $dir = $cfg->{'leistore.dir'} // store_path($self);
@@ -835,16 +950,11 @@ sub start_mua {
 		@cmd = map { $_ eq '%f' ? ($replaced = $mfolder) : $_ } @cmd;
 	}
 	push @cmd, $mfolder unless defined($replaced);
-	if (my $sock = $self->{sock}) { # lei(1) client process runs it
-		send($sock, exec_buf(\@cmd, {}), MSG_EOR);
-	} elsif ($self->{oneshot}) {
-		my $pid = fork // die "fork: $!";
-		if ($pid > 0) { # original process
-			exec(@cmd);
-			warn "exec @cmd: $!\n";
-			POSIX::_exit(1);
-		}
-		POSIX::setsid() > 0 or die "setsid: $!";
+	if ($self->{sock}) { # lei(1) client process runs it
+		# restore terminal: echo $query | lei q --stdin --mua=...
+		my $io = [];
+		$io->[0] = $self->{1} if $self->{opt}->{stdin} && -t $self->{1};
+		send_exec_cmd($self, $io, \@cmd, {});
 	}
 	if ($self->{lxs} && $self->{au_done}) { # kick wait_startq
 		syswrite($self->{au_done}, 'q' x ($self->{lxs}->{jobs} // 0));
@@ -865,14 +975,11 @@ sub send_exec_cmd { # tell script/lei to execute a command
 sub poke_mua { # forces terminal MUAs to wake up and hopefully notice new mail
 	my ($self) = @_;
 	my $alerts = $self->{opt}->{alert} // return;
+	my $sock = $self->{sock};
 	while (my $op = shift(@$alerts)) {
 		if ($op eq ':WINCH') {
 			# hit the process group that started the MUA
-			if ($self->{sock}) {
-				send($self->{sock}, '-WINCH', MSG_EOR);
-			} elsif ($self->{oneshot}) {
-				kill('-WINCH', $$);
-			}
+			send($sock, '-WINCH', MSG_EOR) if $sock;
 		} elsif ($op eq ':bell') {
 			out($self, "\a");
 		} elsif ($op =~ /(?<!\\),/) { # bare ',' (not ',,')
@@ -881,11 +988,7 @@ sub poke_mua { # forces terminal MUAs to wake up and hopefully notice new mail
 			my $cmd = $1; # run an arbitrary command
 			require Text::ParseWords;
 			$cmd = [ Text::ParseWords::shellwords($cmd) ];
-			if (my $s = $self->{sock}) {
-				send($s, exec_buf($cmd, {}), MSG_EOR);
-			} elsif ($self->{oneshot}) {
-				$self->{"pid.$self.$$"}->{spawn($cmd)} = $cmd;
-			}
+			send($sock, exec_buf($cmd, {}), MSG_EOR) if $sock;
 		} else {
 			err($self, "W: unsupported --alert=$op"); # non-fatal
 		}
@@ -922,9 +1025,6 @@ sub start_pager {
 	if ($self->{sock}) { # lei(1) process runs it
 		delete @$new_env{keys %$env}; # only set iff unset
 		send_exec_cmd($self, [ @$rdr{0..2} ], [$pager], $new_env);
-	} elsif ($self->{oneshot}) {
-		my $cmd = [$pager];
-		$self->{"pid.$self.$$"}->{spawn($cmd, $new_env, $rdr)} = $cmd;
 	} else {
 		die 'BUG: start_pager w/o socket';
 	}
@@ -960,9 +1060,8 @@ sub accept_dispatch { # Listener {post_accept} callback
 			open($self->{$i++}, '+<&=', $fd) and next;
 			send($sock, "open(+<&=$fd) (FD=$i): $!", MSG_EOR);
 		}
-		return if scalar(@fds) != 4;
+		$i == 4 or return send($sock, 'not enough FDs='.($i-1), MSG_EOR)
 	}
-	$self->{2}->autoflush(1); # keep stdout buffered until x_it|DESTROY
 	# $ENV_STR = join('', map { "\0$_=$ENV{$_}" } keys %ENV);
 	# $buf = "$argc\0".join("\0", @ARGV).$ENV_STR."\0\0";
 	substr($buf, -2, 2, '') eq "\0\0" or  # s/\0\0\z//
@@ -983,7 +1082,7 @@ sub accept_dispatch { # Listener {post_accept} callback
 sub dclose {
 	my ($self) = @_;
 	delete $self->{-progress};
-	_drop_wq($self);
+	_drop_wq($self) if $self->{failed};
 	close(delete $self->{1}) if $self->{1}; # may reap_compress
 	$self->close if $self->{-event_init_done}; # PublicInbox::DS::close
 }
@@ -1007,6 +1106,7 @@ sub event_step {
 			}
 			die "unrecognized client signal: $buf";
 		}
+		_drop_wq($self); # EOF, client disconnected
 		dclose($self);
 	};
 	if (my $err = $@) {
@@ -1017,10 +1117,11 @@ sub event_step {
 
 sub event_step_init {
 	my ($self) = @_;
-	return if $self->{-event_init_done}++;
-	if (my $sock = $self->{sock}) { # using DS->EventLoop
+	my $sock = $self->{sock} or return;
+	$self->{-event_init_done} //= do { # persist til $ops done
 		$self->SUPER::new($sock, EPOLLIN|EPOLLET);
-	}
+		$sock;
+	};
 }
 
 sub noop {}
@@ -1036,12 +1137,59 @@ sub dump_and_clear_log {
 	}
 }
 
+sub cfg2lei ($) {
+	my ($cfg) = @_;
+	my $lei = bless { env => { %{$cfg->{-env}} } }, __PACKAGE__;
+	open($lei->{0}, '<&', \*STDIN) or die "dup 0: $!";
+	open($lei->{1}, '>>&', \*STDOUT) or die "dup 1: $!";
+	open($lei->{2}, '>>&', \*STDERR) or die "dup 2: $!";
+	open($lei->{3}, '/') or die "open /: $!";
+	chdir($lei->{3}) or die "chdir /': $!";
+	my ($x, $y);
+	socketpair($x, $y, AF_UNIX, SOCK_SEQPACKET, 0) or die "socketpair: $!";
+	$lei->{sock} = $x;
+	require PublicInbox::LeiSelfSocket;
+	PublicInbox::LeiSelfSocket->new($y); # adds to event loop
+	$lei;
+}
+
+sub dir_idle_handler ($) { # PublicInbox::DirIdle callback
+	my ($ev) = @_; # Linux::Inotify2::Event or duck type
+	my $fn = $ev->fullname;
+	if ($fn =~ m!\A(.+)/(new|cur)/([^/]+)\z!) { # Maildir file
+		my ($mdir, $nc, $bn) = ($1, $2, $3);
+		$nc = '' if $ev->IN_DELETE;
+		for my $f (keys %{$MDIR2CFGPATH->{$mdir} // {}}) {
+			my $cfg = $PATH2CFG{$f} // next;
+			eval {
+				local %ENV = %{$cfg->{-env}};
+				my $lei = cfg2lei($cfg);
+				$lei->dispatch('note-event',
+						"maildir:$mdir", $nc, $bn, $fn);
+			};
+			warn "E note-event $f: $@\n" if $@;
+		}
+	}
+	if ($ev->can('cancel') && ($ev->IN_IGNORE || $ev->IN_UNMOUNT)) {
+		$ev->cancel;
+	}
+	if ($fn =~ m!\A(.+)/(?:new|cur)\z! && !-e $fn) {
+		delete $MDIR2CFGPATH->{$1};
+	}
+	if (!-e $fn) { # config file or Maildir gone
+		for my $cfgpaths (values %$MDIR2CFGPATH) {
+			delete $cfgpaths->{$fn};
+		}
+		delete $PATH2CFG{$fn};
+	}
+}
+
 # lei(1) calls this when it can't connect
 sub lazy_start {
 	my ($path, $errno, $narg) = @_;
 	local ($errors_log, $listener);
-	($errors_log) = ($path =~ m!\A(.+?/)[^/]+\z!);
-	$errors_log .= 'errors.log';
+	my ($sock_dir) = ($path =~ m!\A(.+?)/[^/]+\z!);
+	$errors_log = "$sock_dir/errors.log";
 	my $addr = pack_sockaddr_un($path);
 	my $lk = bless { lock_path => $errors_log }, 'PublicInbox::Lock';
 	$lk->lock_acquire;
@@ -1057,7 +1205,6 @@ sub lazy_start {
 	}
 	umask(077) // die("umask(077): $!");
 	bind($listener, $addr) or die "bind($path): $!";
-	listen($listener, 1024) or die "listen: $!";
 	$lk->lock_release;
 	undef $lk;
 	my @st = stat($path) or die "stat($path): $!";
@@ -1075,7 +1222,7 @@ sub lazy_start {
 (Socket::MsgHdr || Inline::C) missing/unconfigured (narg=$narg);
 
 	require PublicInbox::Listener;
-	require PublicInbox::EOFpipe;
+	require PublicInbox::PktOp;
 	(-p STDOUT) or die "E: stdout must be a pipe\n";
 	open(STDIN, '+>>', $errors_log) or die "open($errors_log): $!";
 	STDIN->autoflush(1);
@@ -1085,17 +1232,17 @@ sub lazy_start {
 	return if $pid;
 	$0 = "lei-daemon $path";
 	local %PATH2CFG;
+	local $MDIR2CFGPATH;
 	$listener->blocking(0);
 	my $exit_code;
 	my $pil = PublicInbox::Listener->new($listener, \&accept_dispatch);
 	local $quit = do {
-		pipe(my ($eof_r, $eof_w)) or die "pipe: $!";
-		PublicInbox::EOFpipe->new($eof_r, \&noop, undef);
+		my (undef, $eof_p) = PublicInbox::PktOp->pair;
 		sub {
 			$exit_code //= shift;
 			my $lis = $pil or exit($exit_code);
-			# closing eof_w triggers \&noop wakeup
-			$listener = $eof_w = $pil = $path = undef;
+			# closing eof_p triggers \&noop wakeup
+			$listener = $eof_p = $pil = $path = undef;
 			$lis->close; # DS::close
 			PublicInbox::DS->SetLoopTimeout(1000);
 		};
@@ -1113,9 +1260,13 @@ sub lazy_start {
 	local @SIG{keys %$sig} = values(%$sig) unless $sigfd;
 	undef $sig;
 	local $SIG{PIPE} = 'IGNORE';
-	if ($sigfd) { # TODO: use inotify/kqueue to detect unlinked sockets
-		undef $sigfd;
-		PublicInbox::DS->SetLoopTimeout(5000);
+	require PublicInbox::DirIdle;
+	local $dir_idle = PublicInbox::DirIdle->new([$sock_dir], sub {
+		# just rely on wakeup to hit PostLoopCallback set below
+		dir_idle_handler($_[0]) if $_[0]->fullname ne $path;
+	}, 1);
+	if ($sigfd) {
+		undef $sigfd; # unref, already in DS::DescriptorMap
 	} else {
 		# wake up every second to accept signals if we don't
 		# have signalfd or IO::KQueue:
@@ -1164,34 +1315,103 @@ sub lazy_start {
 
 sub busy { 1 } # prevent daemon-shutdown if client is connected
 
-# for users w/o Socket::Msghdr installed or Inline::C enabled
-sub oneshot {
-	my ($main_pkg) = @_;
-	my $exit = $main_pkg->can('exit'); # caller may override exit()
-	local $quit = $exit if $exit;
-	local %PATH2CFG;
-	umask(077) // die("umask(077): $!");
-	my $self = bless {
-		oneshot => 1,
-		0 => *STDIN{GLOB},
-		1 => *STDOUT{GLOB},
-		2 => *STDERR{GLOB},
-		env => \%ENV
-	}, __PACKAGE__;
-	dispatch($self, @ARGV);
-	x_it($self, $self->{child_error}) if $self->{child_error};
-}
-
 # ensures stdout hits the FS before sock disconnects so a client
 # can immediately reread it
 sub DESTROY {
 	my ($self) = @_;
+	if (my $counters = delete $self->{counters}) {
+		for my $k (sort keys %$counters) {
+			my $nr = $counters->{$k};
+			$self->child_error(1 << 8, "$nr $k messages");
+		}
+	}
 	$self->{1}->autoflush(1) if $self->{1};
 	stop_pager($self);
-	my $err = $?;
-	my $oneshot_pids = delete $self->{"pid.$self.$$"} or return;
-	waitpid($_, 0) for keys %$oneshot_pids;
-	$? = $err if $err; # preserve ->fail or ->x_it code
+	# preserve $? for ->fail or ->x_it code
+}
+
+sub wq_done_wait { # dwaitpid callback
+	my ($arg, $pid) = @_;
+	my ($wq, $lei) = @$arg;
+	my $err_type = $lei->{-err_type};
+	$? and $lei->child_error($?,
+			$err_type ? "$err_type errors during $lei->{cmd}" : ());
+	$lei->dclose;
+}
+
+sub fchdir {
+	my ($lei) = @_;
+	my $dh = $lei->{3} // die 'BUG: lei->{3} (CWD) gone';
+	chdir($dh) || $lei->fail("fchdir: $!");
+}
+
+sub wq_eof { # EOF callback for main daemon
+	my ($lei) = @_;
+	my $wq1 = delete $lei->{wq1} // return $lei->fail; # already failed
+	$wq1->wq_wait_old(\&wq_done_wait, $lei);
+}
+
+sub watch_state_ok ($) {
+	my ($state) = $_[-1]; # $_[0] may be $self
+	$state =~ /\Apause|(?:import|index|tag)-(?:ro|rw)\z/;
+}
+
+sub cancel_maildir_watch ($$) {
+	my ($d, $cfg_f) = @_;
+	my $w = delete $MDIR2CFGPATH->{$d}->{$cfg_f};
+	scalar(keys %{$MDIR2CFGPATH->{$d}}) or
+		delete $MDIR2CFGPATH->{$d};
+	for my $x (@{$w // []}) { $x->cancel }
+}
+
+sub refresh_watches {
+	my ($lei) = @_;
+	my $cfg = _lei_cfg($lei) or return;
+	my $old = $cfg->{-watches};
+	my $watches = $cfg->{-watches} //= {};
+	my %seen;
+	my $cfg_f = $cfg->{'-f'};
+	for my $w (grep(/\Awatch\..+\.state\z/, keys %$cfg)) {
+		my $url = substr($w, length('watch.'), -length('.state'));
+		require PublicInbox::LeiWatch;
+		my $lw = $watches->{$url} //= PublicInbox::LeiWatch->new($url);
+		$seen{$url} = undef;
+		my $state = $cfg->get_1("watch.$url", 'state');
+		if (!watch_state_ok($state)) {
+			$lei->err("watch.$url.state=$state not supported");
+			next;
+		}
+		if ($url =~ /\Amaildir:(.+)/i) {
+			my $d = File::Spec->canonpath($1);
+			if ($state eq 'pause') {
+				cancel_maildir_watch($d, $cfg_f);
+			} elsif (!exists($MDIR2CFGPATH->{$d}->{$cfg_f})) {
+				my @w = $dir_idle->add_watches(
+						["$d/cur", "$d/new"], 1);
+				push @{$MDIR2CFGPATH->{$d}->{$cfg_f}}, @w if @w;
+			}
+		} else { # TODO: imap/nntp/jmap
+			$lei->child_error(1,
+				"E: watch $url not supported, yet");
+		}
+	}
+	if ($old) { # cull old non-existent entries
+		for my $url (keys %$old) {
+			next if exists $seen{$url};
+			delete $old->{$url};
+			if ($url =~ /\Amaildir:(.+)/i) {
+				my $d = File::Spec->canonpath($1);
+				cancel_maildir_watch($d, $cfg_f);
+			} else { # TODO: imap/nntp/jmap
+				$lei->child_error(1, "E: watch $url TODO");
+			}
+		}
+	}
+	if (scalar keys %$watches) {
+		$cfg->{-env} //= { %{$lei->{env}}, PWD => '/' }; # for cfg2lei
+	} else {
+		delete $cfg->{-watches};
+	}
 }
 
 1;