Add language: jinja2

[AceofSpades5757]

Not sure how this would work as it can be embedded in any language, or text file.

• [ ] Set precise settings (e.g. there probably shouldn't be a file type since it should just be a text file, html file, etc.)
• [ ] highlights.scm
• [ ] indents.scm
• [ ] Other scm

[the-mikedavis]

Not sure how this would work as it can be embedded in any language

Tree-sitter doesn't have a built-in way to make the injection language configurable like a templating language would need. This could be handled in a follow-up PR and would benefit other templating languages like EEx. It needs some design but we could have some sort of variable in the injections.scm queries that is derived from the file-type, like .html.j2 files would have the variable set to html.

((some_node) @injection.content
 (#set! injection.combined)
 (#set! injection.language $some_magic_language_variable))

[valpackett]

This should also apply to other template languages with equivalent syntax such as nunjucks (.njk) and twig (no official extension but some editors recognize .twig)

[pascalkuthe]

clsoing this one as stale. Thank you for contributing!

[valpackett]

This cannot actually go "stale", these template languages aren't just going away.

[pascalkuthe]

this PR was a draft for nearly two years. It wasn't finished, had conflicts and wasn't going to be merged in this form. This is not an issue but a PR after all. If somebody wants to see jinja2 support they should make a new PR.