command line applications, supplying parameters, reading from stdout / stderr?

[Joel Longanecker]

Hello emscripten users!

I am planning on building a tool for doing homebrew gameboy development in the web browser. I am hoping to be able to get a compiler and an emulator working to do live reload when a user changes a file, and a bunch of other neat stuff.

Anyways, I feel like the first big thing I need to be able to do is port RGBDS or GBDK over to web assembly. 

https://github.com/rednex/rgbds

https://sourceforge.net/projects/gbdk/files/gbdk/2.96/

This is mostly straight up C, nothing too tricky, no fancy libraries or flags. It might take me a bit to make these forks work nicely, but I am more concerned how to invoke them and use them from the browser.

* How do I invoke these tools so I can pass them command line arguments?

* How do I read from stderr / stdout?

Thanks

-Joel

[Mehdi Sabwat]

Hi, 

I am linking the documentation,

* https://emscripten.org/docs/getting_started/Tutorial.html

* https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html

Hope it helps,

Regards,

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[Mehdi Sabwat]

Sorry, I think I misunderstood your first point.

https://github.com/emscripten-core/emscripten/issues/6434

https://emscripten.org/docs/api_reference/module.html#Module.arguments

You could affect the programs execution with Module["arguments"].push() before. But now it was replaced by `arguments_` so basically in a --post-js or in your C/CPP source file, you could do something like :

EM_ASM({

arguments_.push("Insert argv[1] here")

})

Then you could access it in an array with `arguments_`

Hope it helps, 

Regards,

[Joel Longanecker]

Thanks, That definitely gets me in the right direction.

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[Floh]

For some of those problems you can check whether some of my sokol headers fit your needs:

https://github.com/floooh/sokol

One problem with the established POSIX / CRT APIs is that they don't map particularly well to how things work in the browser runtime, so I tried to create simple alternative C APIs which better map to the web world but still work on native platforms.

[Joel Longanecker]

@Floh

Thanks for introducing me to your wonderful library. I am hoping to be able to port these tools over without having to change the source too much. (I was able to get RGBDS to work as a node app this weekend) But if I do any new work with emscripten, I will definitely keep it in mind.

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