A rebar3 plugin for auto running compile on source file change reloading modules in the shell.
On Linux you need to install inotify-tools.
Add the plugin only to your user local rebar config in ~/.config/rebar3/rebar.config:
{plugins, [rebar3_auto]}.
If you add it to your project rebar.config, it will get unloaded each time compilation occurs, thus breaking it.
Then run
$ rebar3 compile
Then just call your plugin directly in an existing application:
(relx) $ rebar3 auto
===> Compiling rebar3_auto
Setting up watches. Beware: since -r was given, this may take a while!
Watches established.
Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V7.1 (abort with ^G)
1> ===> This feature is experimental and may be modified or removed at any time.
Compiling rebar3_auto
Verifying dependencies...
Compiling relx
Compiling rebar3_auto
Verifying dependencies...
Compiling relx
1>