languages/fish: init

[poseidon-rises]

Add fish support with fish-lsp and fish_indent.

Rewrite of #807 using the new API as the original creator has stopped responding.

Sanity Checking

• I have updated the changelog as per my changes
• I have tested, and self-reviewed my code
• My changes fit guidelines found in hacking nvf
• Style and consistency
  • I ran Alejandra to format my code (nix fmt)
  • My code conforms to the editorconfig configuration of the project
  • My changes are consistent with the rest of the codebase
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas
  • I have added a section in the manual
  • (For breaking changes) I have included a migration guide
• Package(s) built:
  • .#nix (default package)
  • .#maximal
  • .#docs-html (manual, must build)
  • .#docs-linkcheck (optional, please build if adding links)
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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Debug Information

Triggered by: poseidon-rises

HEAD at: languages/fish

Reruns: 1992

[horriblename]

I'll hold off on merging this till #1103 is merged

[imnotpoz]

v0.8 was merged, the PR's target branch should be set to main

[NotAShelf]

One blocker, lgtm afterwards.

[NotAShelf]

@poseidon-rises the CI is failing because Nix is failing to evaluate type = listOf enum (attrNames formats);. I believe it's supposed to be listOf (enum (...)) or otherwise it thinks listOf takes two args, which it doesn't. Good for a merge once the CI failures have been addressed.