- check that server_host column does not already exist before addding it
and making other changes to table (update_sql becomes idempotent,
yay!)
- check that indexes exist before dropping them (some are historical and
are not created in more recent deployments), elminating spurious
errors from logs
- update new_sql_schema config after migration, to allow near
zero-downtime migrations (and help with automated testing)
For columns are already included in a compound index there is no
benefit to having a separate index with a subset of the same columns in
the same order, it just wastes space.
If we use _`whatever`_ here in ejabberd man pages,
it is converted to *`whatever`* in markdown,
and docs.ejabberd.im/Makefile converts to the proper links
Several documentation callbacks (doc/0 and mod_doc/0) are implemented
and `ejabberdctl man` command is added to generate a man page. Note
that the command requires a2x to be installed (which is a part of
asciidoc package).
The header consisted of too many unrelated stuff and macros misuse.
Some stuff is moved into scram.hrl and type_compat.hrl.
All macros have been replaced with the corresponding function calls.
TODO: probably type_compat.hrl is not even needed anymore since
we support only Erlang >= OTP 17.5
The callback is supposed to provide known options and their default
values, as long as the documentation. Passing default values into
get_mod functions is now deprecated: all defaults should be provided
by the Mod:mod_options/1 callback.
