[bug] Polling mode doesn't work on osx

[jaredly]

rebel -P, and then I change one of my source files, and it doesn't recompile. Am I missing a step?
I have to kill & re-run rebel for my stuff to be recompiled

[vramana]

@jaredly It works for fine for me. Can you try it on different project and see if that makes any difference?

[jaredly]

mkdir -p something/src
cd something
echo "{}" > package.json
echo 'print_endline "hello";' > src/hello.re
rebel -P # in a diff tab
./_build/src/app.out # `hello`
echo 'print_endline "hello all";' > src/hello.re
./_build/src/app.out # `hello`

[jaredly]

13:23:34 rsn/something 0 $ rebel -P
*** jenga: [79301] root=/Users/jared/clone/rsn/something, sys=Darwin, j=1, f=1 (NO_VERSION_UTIL)
*** jenga: 6/6 targets are up to date
*** jenga: done (#1, 107ms, heap=7.35156m, stat=20, digest=5, ls=1, db-save=0) -- HURRAH
*** jenga: todo: 0 (6 / 6) j=0+0 con=6 save=0 act=3, finished
*** jenga: polling for filesystem changes

and it never does anything else

[jaredly]

except for running GC for some reason ??

[vramana]

cc @chenglou I think polling mode worked for you. Could it be a jenga bug? I can't think of any reasons.

[chenglou]

Never tried polling actually. Just assumed it didn't work on OS X. I think OS X isn't officially supported for polling. cc @bsansouci

[bsansouci]

Jenga uses a linux watcher (inotify I think) so no polling on osx :/

[chenglou]

Time to replace it with watchman =)

[jaredly]

boo :/ who cares if its fast if it doesn't work

[bsansouci]

If you want a bad replacement for this that only depends on node: https://github.com/bsansouci/tapknight/blob/6c3d7371a5c67209d75ee6bc309db755d8cf4081/watch.js
I could never figure out watchman lol

[jaredly]

right watchman has caused me so much grief

[jaredly]

and watchman was developed for FacebookScale™ and so is probs overkill for anything that's not the fb monorepo :P

[jaredly]

made a note there janestreet/jenga#30
but maybe this is another reason to just have a wrapper around jenga that

• gets multiple indepedant build targets working (with diff backends, flags, etc)
• makes file watching work cross-platform