[PATCH 16/16] doc: lei-config: document various knobs

[Eric Wong <e@80x24.org>]

It's still a work-in-progress, but the basic debug knob
comes in handy for new users; as does proxy support.
---
 Documentation/lei-config.pod | 91 +++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 1 deletion(-)

diff --git a/Documentation/lei-config.pod b/Documentation/lei-config.pod
index a64045ef..daf66fe4 100644
--- a/Documentation/lei-config.pod
+++ b/Documentation/lei-config.pod
@@ -8,10 +8,99 @@ lei config [OPTIONS]
 
 =head1 DESCRIPTION
 
-Call git-config(1) with C<$XDG_CONFIG_HOME/lei/config> as the
+Call L<git-config(1> with C<$XDG_CONFIG_HOME/lei/config> as the
 configuration file.  All C<OPTIONS> are passed through, but those that
 override the configuration file are not permitted.
 
+All C<imap> and C<nntp> options may be specified per-host or
+(if using git 2.26+) with wildcards:
+
+	[imap "imap://*.onion"]
+		proxy = socks5h://127.0.0.1:9050
+
+	[nntp "nntp://example.com"]
+		proxy = socks5h://127.0.0.1:1080
+
+=head2 VARIABLES
+
+=over 8
+
+=item external.*
+
+Managed by L<lei-add-external(1)> and L<lei-forget-external(1)>
+
+=item imap.proxy
+
+=item nntp.proxy
+
+The C<socks5h://> proxy address.  Older versions of SOCKS may
+be supported if there is user demand.
+
+=item imap.starttls
+
+=item nntp.starttls
+
+Enable or disable STARTTLS on non-imaps:// and non-nntps://
+hosts.  By default, STARTTLS is enabled if available unless
+connecting to a Tor .onion or localhost.
+
+=item imap.compress
+
+=item nntp.compress
+
+Enable protocol-level compression, this may be incompatible
+or broken with some servers.
+
+Note: L<Net::NNTP> compression support is pending:
+L<https://rt.cpan.org/Ticket/Display.html?id=129967>
+
+=item imap.debug
+
+=item nntp.debug
+
+Enable debugging output of underlying IMAP and NNTP libraries,
+currently L<Mail::IMAPClient> and L<Net::NNTP>, respectively.
+If using L<imap.proxy> or L<nntp.proxy> point to a SOCKS proxy,
+debugging output for L<IO::Socket::Socks> will be enabled, as
+well.
+
+Disabling L<imap.compress> may be required to improve output.
+
+=item imap.timeout
+
+=item nntp.timeout
+
+The read timeout for responses.
+
+Default: 600 seconds (IMAP); 120 seconds (NNTP)
+
+=item imap.fetchBatchSize
+
+Number of full messages to fetch at once.  Larger values reduce
+network round trips at the cost of higher memory use, especially
+when retrieving large messages.
+
+Small responses for IMAP flags are fetched at 10000 times this value.
+
+Default: 1
+
+=item imap.ignoreSizeErrors
+
+Ignore size mismatches from broken IMAP server implementations.
+
+Default: false
+
+=item color.SLOT
+
+C<quoted>, C<hdrdefault>, C<status>, C<attachment> color slots
+are supported for the C<-f text> and C<-f reply> output formats
+of L<lei-lcat(1)> and L<lei-q(1)>.
+
+The any per-project .git/config, and global ~/.gitconfig files
+will also be parsed for diff coloring.  git diff color slots
+(C<color.diff.SLOT>) supported are C<new>, C<old>, C<meta>,
+C<frag>, C<func>, and C<context>.
+
 =head1 CONTACT
 
 Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>