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Show HN: Go Template Preview – Powered by WebAssembly

102 points by ricardbejarano 4y ago

joeblubaugh 4y ago
Does it handle defining functions? I can’t get them to work.
- ricardbejarano 4y ago
  I'm afraid it cannot, since those functions would need to be compiled into WASM first, and that's something the browser can't do. What I could add, though, is a bunch of "standard" functions (like the ones found in Hugo, for example). Noted!
  - eatonphil 4y ago
    If you already have Go libraries compiling to wasm working then you could just embed a Go interpreter like yaegi [0]. [0] https://github.com/traefik/yaegi https://github.com/traefik/yaegi
  - pjmlp 4y ago
    Besides the comment regarding using a Go interpreter, you can definitely compile inside of the browser and then load that WASM module into the current session.
    - isaacimagine 4y ago
      Using which compiler?
      - pjmlp 4y ago
        Time to learn how to write one? I didn't say there is already a Go compiler that supports such workflow, rather that the infrastructure doesn't forbid it.
      - ridruejo 4y ago
        https://www.google.com/amp/s/golangexample.com/go-compiler-running-entirely-in-your-browser/amp/ https://www.google.com/amp/s/golangexample.com/go-compiler-r... Haven’t tried the above, just an example. Tinygo is the one commonly used in the Wasm ecosystem
tekronis 4y ago
Thanks for making this. Maybe add an option that also exposes additional template functions from sprig: https://github.com/Masterminds/sprig https://github.com/Masterminds/sprig
boramalper 4y ago
Interesting that it's easier to run Go in browser using WebAssembly than to write a templating engine that uses Go's syntax in JS from scratch. :)
- colordrops 4y ago
  Is it either interesting or easier though?
- deleted 4y ago
  [deleted]
cyberpunk 4y ago
This is awesome. Cheers!
seanwilson 4y ago
This is cool! Do you think you could get Hugo to run in the browser this way so you could show live-previews in the browser without having to run Hugo locally?
- ricardbejarano 4y ago
  It... should, i think? I'll try! Binary size is the main issue with Go WASM, the binary on this is 4MB, and it only does templating. TinyGo won't work because it doesn't have reflect (which I need for parsing arbitrary JSON). But I'll give it a spin. Thanks!
  - drgo 4y ago
    Nice Most recent release of Tinygo supports JSON decoding https://tinygo.org/docs/reference/lang-support/stdlib/ https://tinygo.org/docs/reference/lang-support/stdlib/
randomguy011 4y ago
Hi @ricardbejarano First of all, I really interested with this project and I see there is a room for improvement, mind to open source the code? thanks randomguy011
SergeAx 4y ago
Great project, well-bounded and insightful! Do you think about making it open source? I was thinking about trying to use another JSON library and make it work with tinygo, but don't want to repeat the work.

Does it handle defining functions? I can’t get them to work.

ricardbejarano 4y ago
I'm afraid it cannot, since those functions would need to be compiled into WASM first, and that's something the browser can't do. What I could add, though, is a bunch of "standard" functions (like the ones found in Hugo, for example). Noted!
- eatonphil 4y ago
  If you already have Go libraries compiling to wasm working then you could just embed a Go interpreter like yaegi [0]. [0] https://github.com/traefik/yaegi https://github.com/traefik/yaegi
- pjmlp 4y ago
  Besides the comment regarding using a Go interpreter, you can definitely compile inside of the browser and then load that WASM module into the current session.
  - isaacimagine 4y ago
    Using which compiler?
    - pjmlp 4y ago
      Time to learn how to write one? I didn't say there is already a Go compiler that supports such workflow, rather that the infrastructure doesn't forbid it.
    - ridruejo 4y ago
      https://www.google.com/amp/s/golangexample.com/go-compiler-running-entirely-in-your-browser/amp/ https://www.google.com/amp/s/golangexample.com/go-compiler-r... Haven’t tried the above, just an example. Tinygo is the one commonly used in the Wasm ecosystem

Thanks for making this. Maybe add an option that also exposes additional template functions from sprig: https://github.com/Masterminds/sprig https://github.com/Masterminds/sprig

boramalper 4y ago

Interesting that it's easier to run Go in browser using WebAssembly than to write a templating engine that uses Go's syntax in JS from scratch. :)

colordrops 4y ago
Is it either interesting or easier though?
deleted 4y ago
[deleted]

cyberpunk 4y ago

This is awesome. Cheers!

seanwilson 4y ago

This is cool! Do you think you could get Hugo to run in the browser this way so you could show live-previews in the browser without having to run Hugo locally?

ricardbejarano 4y ago
It... should, i think? I'll try! Binary size is the main issue with Go WASM, the binary on this is 4MB, and it only does templating. TinyGo won't work because it doesn't have reflect (which I need for parsing arbitrary JSON). But I'll give it a spin. Thanks!
- drgo 4y ago
  Nice Most recent release of Tinygo supports JSON decoding https://tinygo.org/docs/reference/lang-support/stdlib/ https://tinygo.org/docs/reference/lang-support/stdlib/

randomguy011 4y ago

Hi @ricardbejarano First of all, I really interested with this project and I see there is a room for improvement, mind to open source the code? thanks randomguy011

SergeAx 4y ago

Great project, well-bounded and insightful! Do you think about making it open source? I was thinking about trying to use another JSON library and make it work with tinygo, but don't want to repeat the work.