doc: extindex: document current behavior + knobs

I'm not really sure if extindex writing to the config file
is a good idea (since -index doesn't, as -init exists).
Just document what it does and let the user handle it, since
the config file shouldn't be daunting to new users.

2 files changed, 29 insertions, 4 deletions

diff --git a/Documentation/public-inbox-config.pod b/Documentation/public-inbox-config.pod
index a5bc67fd..43e54ed4 100644
--- a/Documentation/public-inbox-config.pod
+++ b/Documentation/public-inbox-config.pod
@@ -358,6 +358,22 @@ more than once, in which case the values are merged.
 
 Default: none
 
+=item extindex.<name>.topdir
+
+The directory of an external index.  See
+L<public-inbox-extindex(1)> for more details.
+
+=item extindex.<name>.url
+
+Identical to L</publicinbox.E<lt>nameE<gt>.url>, but for
+external indices
+
+=item extindex.<name>.coderepo
+
+Identical to L</publicinbox.E<lt>nameE<gt>.coderepo>, but for
+external indices.  Code repos may be freely associated with
+any number of public inboxes and external indices.
+
 =back
 
 =head2 NAMED LIMITER (PSGI)
diff --git a/Documentation/public-inbox-extindex.pod b/Documentation/public-inbox-extindex.pod
index a0fca83c..9731dfb0 100644
--- a/Documentation/public-inbox-extindex.pod
+++ b/Documentation/public-inbox-extindex.pod
@@ -10,9 +10,6 @@ public-inbox-extindex [OPTIONS] [EXTINDEX_DIR] --all
 
 =head1 DESCRIPTION
 
-FIXME: behavior not finalized  It should probably write to the
-config file the first time --all is used.
-
 public-inbox-extindex creates and updates an external search and
 overview database used by the read-only public-inbox PSGI (HTTP),
 NNTP, and IMAP interfaces.  This requires either the
@@ -70,7 +67,19 @@ L<public-inbox-extindex-format(5)>
 
 =head1 CONFIGURATION
 
-... TODO, see L<public-inbox-index(5)>
+public-inbox-extindex does not currently write to the
+L<public-inbox-config(5)> file, configuration may be entered
+manually.  The extindex name of C<all> is a special case which
+corresponds to indexing C<--all> inboxes.  An example for
+C<--all> is as follows:
+
+        [extindex "all"]
+                topdir = /path/to/extindex_dir
+                url = all
+                coderepo = foo
+                coderepo = bar
+
+See L<public-inbox-config(5)> for more details.
 
 =head1 ENVIRONMENT