Re: command-line pandoc on iOS

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

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I've looked at this a couple of times since I last wrote. It turns out the 
latest Docker image is 2 years old, and apparently 
<https://github.com/tweag/asterius/issues/354> contains pandoc 2.9.2.1.

So it looks like I have to do the full pandoc build with ahc-cabal. I 
installed the prerequisites, and started following the instructions to 
build Asterius, but immediately hit a snag when it asked me to run a script 
that isn't provided in the repo. It turns out the project now uses bazel, 
whatever that is, but the person who discovered this ran it and found that 
he couldn't execute the resulting binaries (see Asterius issue 894 
<https://github.com/tweag/asterius/issues/894>). So I don't feel encouraged 
to follow his example.

I've had the idea of writing a stub in Python that would parse pandoc 
command line arguments and then use pandoc-server to do the actual 
processing. I'd just ignore options like -L that can't be implemented this 
way. It wouldn't be a great solution, but it would be adequate for some 
cases.

If I do that, Lua filter support in pandoc-server would be very useful 
(most of my filters are indeed safe), but I see from the referenced issue 
that it's not coming soon.

On Monday, October 17, 2022 at 4:47:08 PM UTC+2 fiddlosopher wrote:

> If we could implement
> https://github.com/jgm/pandoc/issues/8273 "safe mode for Lua filters"
> then we could add Lua support to pandoc-server. (Of course, this assumes 
> that
> you wouldn't need to use any unsafe functions in your Lua filters.)
>
>
> > On Oct 17, 2022, at 2:15 AM, ffi.a...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> > 
> > I was playing around with pandoc-server before I decided I needed the 
> command-line program. It would work for some cases, but without Lua 
> scripting, it wouldn't be adequate for the document builds. In theory, I 
> could use pandoc-server to convert to a JSON AST, run a filter locally, and 
> then send it back to the server for the next stage of conversion, but that 
> seems slow and conplex.
> > 
> > I probably won't work quickly on building pandoc with Asterius.
> > 
> >> On Oct 16, 2022, at 7:58 PM, John MacFarlane <fiddlo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 
> wrote:
> >> 
> >> This would be cool, so let us know if you have any success with 
> asterius. I haven't tried it myself. If you run into Haskell-specific 
> problems, let us know and perhaps we can help.
> >> 
> >> Note: for your iPad purposes, another alternative would be to run 
> pandoc as a server somewhere. This is now very easy with `pandoc-server`. 
> It is fairly full-featured, with the caveat that it runs in "safe mode," so 
> you have to explicitly send all resources needed for compilation to the 
> server (it won't be able to look for them on your local file system).
> >> 
> >>> On Oct 16, 2022, at 8:20 AM, jcr <ffi.a...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >>> 
> >>> 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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