Add Pkl language

[stackoverflow]

Description

Adds support for the Pkl programming language.

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.pkl+%2F%5E%5Cs*%28module%7Cimport%5Cs*%22%7Camends%7Cextends%7Clocal%7Cconst%7Cfixed%7Cabstract%7Copen%5Cs*%5Bclass%7Cmodule%5D%7Cclass%5Cs*%5B%5E%3D%5D%7Ctypealias%7C%40%5Cw%2B%29%5Cb%2F+NOT+user%3Aapple
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/apple/pkl-pantry/blob/main/packages/org.json_schema/Parser.pkl
      • https://github.com/apple/pkl-pantry/blob/main/packages/io.prometheus/examples/rule.pkl
      • https://github.com/apple/pkl-pantry/blob/main/packages/org.openapis.v3/tests/SchemaGenerator.pkl
    • Sample license(s):
      • Apache-2.0
  • I have included a syntax highlighting grammar: https://github.com/apple/pkl.tmbundle
  • I have added a color
    • Hex value: #6b9543
    • Rationale: This is one of the colors of the Pkl logo
  • I have updated the heuristics to distinguish my language from others using the same extension.

[stackoverflow]

I've tried to remove our org from the language search but I'm not sure the syntax supports it.
Filtered our repos.

[lildude]

See inline comment.

I've tried to remove our org from the language search but I'm not sure the syntax supports it.

Sure does. Add NOT user:apple to the query.

[lildude]

We need samples and supporting searches for all extensions and filenames added to a PR. If usage isn't sufficient, support can be added later and an override can be used in the interim.

Also keep in mind that the same grammar and thus syntax highlighting will be applied to all extensions and filenames associated with a language.

[stackoverflow]

We need samples and supporting searches for all extensions and filenames added to a PR. If usage isn't sufficient, support can be added later and an override can be used in the interim.

Oh, I guess I missed that and thought they could be lumped together as they are just different extensions/names for the same language.
What do you mean by an override can be used in the interim.?

Also keep in mind that the same grammar and thus syntax highlighting will be applied to all extensions and filenames associated with a language.

That is fine. Both .pcf and PklProject are just Pkl files. pcf is a subset of Pkl.

[lildude]

What do you mean by an override can be used in the interim.?

https://github.com/github-linguist/linguist/blob/master/docs/overrides.md

[stackoverflow]

@lildude I removed .pcf and PklProject from the list of file names and extensions. We don't have the expected usage data yet. Will add this later as a separate PR once we do have the data.

For some reason my last commit didn't appear in the PR even though it's there if you click the branch...

[stackoverflow]

Hi @lildude. Are we still pending on popularity? There's considerably more pkl files in the search since I created this PR.

[lildude]

I don't know. I'll re-assess when we're closer to making the next release. As we've just made a release, the next one won't be for a few more months.

[Senjai]

Just commenting for context RE: Popularity, we're currently using this in one or two of Shopify's internal repositories. I'd like to pitch using this for some of our external open source stuff, but there is a bit of chicken-and-egg there since we want the Github experience to be fantastic for our open source projects as well. Just adding another viewpoint if it helps at all.

@lildude Popularity aside, are you generally okay with the implementation here?

[hugolgst]

any updates? would love to see it move forward.

Changes have been implemented. Popularity will be reassessed closer to the next release.

[hugolgst]

amazing!!