command-line pandoc on iOS

[jcr <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I would like to be able to run pandoc-based document builds on an iPad. 
This seems to be possible with the [a-Shell 
app](https://holzschu.github.io/a-Shell_iOS/). It provides a Unix-like 
shell with LaTeX (additional 1.3GB download), Python, Lua, and many command 
line utilities. C and C++ programs can be compiled to WebAssembly on the 
device and run there. It is also possible to cross-compile for a-Shell, 
using a [customized WASI-SDK](https://github.com/holzschu/wasi-sdk).

[Asterius](https://github.com/tweag/asterius) compiles Haskell to 
WebAssembly, and there are a couple of demos that use it to run pandoc in a 
webpage, but the WebAssembly files they use offer a simple JavaScript 
interface to the Haskell pandoc function: (input, from format, to format) 
-> output. I need the full command line interface to run document builds. 
It looks possible, but since I've never used Haskell, its build tools, or 
WASI-SDK, I'm not sure how to go about this. There's a pre-built Docker 
container for Asterius with about 2000 packages from Stockage (I think I 
can guess what that is), but I don't know if I can use that, or if I have 
to rebuild everything from scratch using the customized WASI-SDK. After 
that, I guess I would download the pandoc source and follow the 
instructions for building it with cabal, using `ahc-cabal` in place of 
`cabal`. But if anything goes wrong with the cabal build, I'll be lost.

Has anyone already done this?

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