helix-editor
Tcl grammar
There's a Tcl tree-sitter on Sourcehut that's under fairly active development, although I don't know whether it's feature-complete.
I'm giving this a shot to see how complete the implementation is, but building the grammars is reporting Failed to execute C/C++ compiler on hx --grammar build, despite my having gcc/++ and clang/++ both in my $PATH and CC set. If there's an obvious first thing to try I'd prefer not to start a new report. Any ideas?
That grammar repository may not be possible to add without some extra work. It looks like it uses mercurial for VCS instead of git and currently we can only fetch grammars with git or local sources. You may need to create a git mirror
