Add language: Sweave

[grady]

Description

resolves #6538

A prose language for literate programming with the R statistical software language. Precursor to Rmarkdown, a supported language. Mixes R code with TeX documentation. Present in documentation of many R language repositories.

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:
      • .Rnw
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • knitr-beamer.Rnw source: https://github.com/yihui/knitr/blob/master/inst/examples/knitr-beamer.Rnw
      • knitr-minimal.Rnw source: https://github.com/yihui/knitr/blob/master/inst/examples/knitr-minimal.Rnw
    • Sample license(s): GPL for all
  • I have included a syntax highlighting grammar: https://github.com/textmate/sweave.tmbundle
  • I have added a color
    • Hex value: #198ce7
    • Rationale: Same color as R and Rmarkdown, since this is a related language
  • I have updated the heuristics to distinguish my language from others using the same extension.
    • these extensions are unused by other languages at this time

[grady]

Questionable if the .Snw extension should be included or not. It is obsolete and only has 350 hits in the search, while the dominant .Rnw extension has over 17k results.

[lildude]

Questionable if the .Snw extension should be included or not. It is obsolete and only has 350 hits in the search, while the dominant .Rnw extension has over 17k results.

Not 😄 It doesn't meet our popularity requirements by a large margin. An override can always be used once this PR have been merged and deployed.

[lildude]

Please remove or replace samples/Sweave/Sweave.Rnw with a smaller sample as the current sample is unnecessarily large (if it's not displayed in the diff by default, it's generally too big).

[grady]

Removed .snw extension from languages.yml and deleted related .snw sample file.
Removed large Sweave.Rnw sample file. Two samples remain.
Edited PR description to match above.

As far as heuristics go, the unique features of the language that I can think of are

• basic structure of a tex file, in fact it could be a valid tex file itself with nothing extra.
• the string \Sexpr anywhere in the file (optional, not extremely common)
• lines that begin with << and end with >>= (also optional, but most files will have this)

[lildude]

Don't worry about the heuristics… as you've pointed out this is the only user of that extension and a quick search suggests this isn't likely to cause problems.

You will however need to address the test failures.

[grady]

I addressed the ace_mode fail, but the request to run a script will need to wait until tomorrow. Dev machine is in the office.

I set ace_mode to tex, on the basis that a valid .tex file is also valid .Rnw.

[lildude]

I addressed the ace_mode fail, but the request to run a script will need to wait until tomorrow. Dev machine is in the office.

Done it for you.

[lildude]

All looks good now. Thanks.