the erlang re-up

Watches your erlang source/header files for changes, recompiles the changed modules using the same compiler options as the last compile, and reloads them.

Conceptually similar to sync and active, but works happily on NFS or vbox shared folders. Stateless, because we watch the filesystem by polling with find, so can handle enormous erlang projects just fine.

Because it reuses the compile options from last time (provided you compile with debug_info), it will Just Work, regardless of what you use to build your project (rebar2, rebar3, make, etc).

Building

Add this application as a dev-only dependency to your project. If you're using rebar3, which I recommend, this should be easy.

Something, something..

application:start(reup).

Options

If you want reup to compile but not load the modules, set application env:

{reload_on_compile, false}

Implementation Notes

Has to work on virtualbox with crappy shared folders, so doesn't use inotify or fswatcher stuff. Known to work on Ubuntu Linux & OS X.

The script in priv/ polls for src changes using some shell gubbins, and emits changed filenames.

If a *.hrl file changes, it naively emits the filenames of *.erl files that match a grep for the header filename, which tends to work.