Add FPP (F Prime Prime) language

[thomas-bc]

Adds support for FPP (short for "F Prime Prime"), the domain specific modeling language of NASA's F Prime flight software framework. More info at https://github.com/nasa/fprime and https://fprime.jpl.nasa.gov

Description

FPP is the DSL used to model software components in F´, from which C++ is autocoded for flight software applications. It is used across NASA flight projects and the F´ open-source community, with users from academia (university cubesat teams, research) and industry.

.fpp is currently recognized as Fortran, so this PR adds a heuristic on specific FPP keywords. Let me know if you have better patterns for this and I'm happy to iterate (disclaimer: I've used AI to help me craft this changeset, but I (human) will happily iterate manually with yall)

FPP also uses .fppi by convention to note files that are to be included in other files, so I have added it as well.

Thank you from the F Prime team!

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*.fpp+port (3400 files containing the keyword port which seems to yield no Fortran results)
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.fpp+%22topology%22 (1300 files)
      • Refined sequence-of-keywords search (4k+ files, all should be F Prime)
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.fppi (1300 .fppi files)
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/nasa/fprime/blob/devel/Svc/Subtopologies/CdhCore/CdhCore.fpp
      • https://github.com/nasa/fprime/blob/devel/Svc/CmdDispatcher/CmdDispatcher.fpp
      • https://github.com/nasa/fprime/blob/devel/Svc/FileDownlink/FileDownlink.fpp
      • https://github.com/nasa/fprime/blob/devel/Svc/FileDownlink/Events.fppi
      • https://github.com/nasa/fprime/blob/devel/TestDeploymentsProject/Ref/Top/topology.fpp
      • https://github.com/nasa/fprime/blob/devel/TestDeploymentsProject/Ref/Top/instances.fpp
      • Fortran .fpp samples conflicting with FPP samples:
        • https://github.com/MFlowCode/MFC/blob/master/src/common/m_finite_differences.fpp and https://github.com/MFlowCode/MFC/blob/master/src/simulation/m_fftw.fpp
    • Sample license(s): Apache-2.0 (nasa/fprime), MIT (MFlowCode/MFC)
  • I have included a syntax highlighting grammar: https://github.com/fprime-community/fpp-tools (Apache-2.0, source.fpp)
  • I have added a color
    • Hex value: #d37327
    • Rationale: F Prime theme, distinct from Fortran's #4d41b1.
  • I have updated the heuristics to distinguish my language from others using the same extension.

[thomas-bc]

all patterns here are matching on common FPP keywords ... let me know if there are better approaches since we have a grammar...

[lildude]

This approach is good.

[thomas-bc]

Not sure the Fortran FPP samples are needed - happy to remove

[lildude]

Thanks for these. We don't currently have .fpp samples for Fortran as it was added in the very early days of Linguist before we started collecting samples. It's also needed for your heuristic test.

[lildude]

This is a framework and not an actual language… you've stated it. We don't add support for frameworks, hence there's no React or Ruby on Rails language in Linguist.

We can certainly add a specific language (F Prime?) for files incorrectly identified or add their extensions to the languages they're actually written in.

(Whoops, didn't mean to close)

[thomas-bc]

Apologies if my PR description was confusing. F Prime is a framework, but FPP is a language, with its own compiler, formal language specification, language server, and more. It's not built on top of another language like Ruby on Rails or React.
I am trying to add support for the FPP language in this PR.

Or is there a strict definition of a language that Linguist accepts?

[lildude]

Ok. So "F Prime Prime" is the language and "F Prime" is the framework? 🤯 Feels the wrong way round to me, but 🤷.

[lildude]

Looks good. Your timing is perfect too as I'm about to make a new release so it won't be long before this lands on GitHub.

[lildude]

This approach is good.

[lildude]

Thanks for these. We don't currently have .fpp samples for Fortran as it was added in the very early days of Linguist before we started collecting samples. It's also needed for your heuristic test.

[thomas-bc]

Thanks a lot!