httpgd 2.0

[nx10]

This PR tracks my progress towards the major restructuring described in https://github.com/nx10/httpgd/issues/92#issuecomment-1055800004 .

This is a major rewrite and I decided to take this opportunity to make many breaking API changes (hence the 2.0 instead of 1.4).

~There is still a lot to do and I do not recommend testing the code yet, but I will update this description once it is.~

Update 1:

httpgd will break up into two R packages and 4 repositories to increase maintainability:

• unigd
• httpgd (this repo)
  • httpgd-client
  • httpgd npm package

Roadmap to httpgd 2.0 / unigd 1.0 release:

• [x] Split parts of httpgd in unigd
• [x] Migrate httpgd from boost/beast to crow
• [x] Port httpgd client to svelte
• [ ] Stabilize httpgd-client
• [x] Stabilize unigd C API
• [x] Stabilize httpgd 2.0
• [x] (Possibly) minor additional features

Still not ready for testing, but getting closer.

Update 2:

unigd is getting closer to stabilization. I decided to fully implement the binary API in C instead of C++ which was far more time intensive, but should future proof everything (C++ standard can be increased independently; languages like C, Rust or Zig can be used to interface with unigd...). Also added a base64 PNG renderer to unigd.

Update 3:

The release is coming closer.

• There is still a lot of polishing to do with unigd and httpgd 2.0.
• The C API is close to stable, I have a number of improvements in mind, but these will probably come as API v2 to get this version released without much more delay.
• I will probably do some changes to the httpgd R API next to make it easier to use and make it similar to unigd.
• TIFF rendering is back and should work cross platform now.
• Improvements to testing and CI.

If you want to test the development version please install the newest version of unigd first and then the unigd branch of httpgd:

remotes::install_github("nx10/unigd")
remotes::install_github("nx10/httpgd@unigd")

Edit: If you find any bugs or have feedback or suggestions just post them as a comment to this PR. As soon as this is merged I will migrate issues to the respective repos.

[nx10]

I consider this stable enough for widespread testing now and will merge when the CI is finished. There have been a number of bug fixes in the last couple of ~weeks~ months so I think we should test and release 2.0 without waiting for me to finish the new httpgd-client. Once the unigd/httpgd is released on CRAN subsequent non-breaking releases should be much easier.