CLI: coffee --watch fails on file that does not exist

[ianb]

When using coffee --watch I have non-existent files in the directory (Emacs creates files like .#filename.coffee). It would be better to simply ignore these. Sample traceback:

/home/ianb/.node_libraries/.npm/coffee-script/1.0.0/package/lib/command.js:62
        throw new Error("File not found: " + source);
              ^
Error: File not found: static/.#site.coffee
  at /home/ianb/.node_libraries/.npm/coffee-script/1.0.0/package/lib/command.js:62:19
  at path.js:151:19

[TrevorBurnham]

So, what would the best precise solution be? Ignore files whose names start with ., or .#? There must be some precedence for this.

[TrevorBurnham]

Looking more closely, I see that command.coffee throws an error whenever a nonexistent file is encountered; I believe this line is left over from way back before support for directories was added. The behavior should be to throw an error only if the nonexistent file was given directly as an argument to coffee (in which case topLevel is true). So I believe the line should be changed from

throw new Error "File not found: #{source}" unless exists

to

throw new Error "File not found: #{source}" if topLevel and not exists

That way, you'd still get an error if you ran coffee -c .#filename.coffee, but you wouldn't get an error if such a file were momentarily in the directory you provided to coffee.

[ianb]

That sounds perfect to me.

[jashkenas]

Thanks for figuring this one out, Trevor. I've made the requested change at SHA: 83d424f.

[pmapcat]

This issue appears in coffeescript 1.8.0 too.
File not found: .#screenshot.coffee
And watch then stops.
I am using command :

coffee --watch -o output -c ./ 

Strange thing, that this is also takes into account non coffee files. like

File not found: .#postinstall.sh

Thanks

[philc]

Can we reopen this bug? It has been regressed recently. I've reproduced this in coffeescript 1.9.3 and 1.10.0, and @Michaelleachim saw it in 1.8.0.

It's a very annoying bug for emacs developers, because operations within emacs which create temporary files and then delete them (like using magit to write a git commit message) crashes the coffeescript process.

[celwell]

This has been annoying me as well. Is there a filter I can add to my watch dir command?

coffee -o . -cwb src

[GeoffreyBooth]

I can’t seem to reproduce this. I tried running emacs and creating and saving, and opening and saving files. I also ran coffee -cwo ./dist/ ./src in one tab and touch .foo.coffee in another tab, and then rm .foo.coffee in that tab, and the watch task handled the events just fine:

19:33:50 - compiled ~/src/.foo.coffee
19:34:01 - removed ~/src/.foo.coffee

If someone can post steps to reproduce in current CoffeeScript, I’ll reopen.