It is possible because their syntax highlighting uses tree-sitter.

Furthermore, I suggest updating the Elixir configuration to support specific features of the language server in heex. Additionally, I discovered that my understanding of the “injection-regex” configuration item was incorrect, and we may not require it.

[[language]]
name = "elixir"
scope = "source.elixir"
file-types = ["ex", "exs", "heex"]
roots = ["mix.exs"]
auto-format = true
diagnostic-severity = "Hint"
comment-token = "#"
indent = {tab-width = 2, unit = " "}
language-server = {command = "elixir-ls"}

I’ve figured out a great trick, to be able to run mix test with filename and line numbers as longs a https://github.com/helix-editor/helix/pull/6979 is not merged yet.

I’m using zellij, wezterm and helix of course.

1. I use this script to parse the file and line number from the terminal:

        set -x

        status_line=$(wezterm cli get-text | rg -e "(?:NOR\s+|NORMAL|INS\s+|INSERT|SEL\s+|SELECT)\s+[\x{2800}-\x{28FF}]*\s+(\S*)\s[^│]* (\d+):*.*" -o --replace '$1 $2')
        filename=$(echo $status_line | awk '{ print $1}')
        line_number=$(echo $status_line | awk '{ print $2}')

        case "$1" in
          "file")
            mix test $filename
            ;;
          "line")
            mix test $filename:$line_number
            ;;
          "all")
            mix test
            ;;
        esac

Source: nix-hour/code/29/home.nix at dfe7bfde9dc117b3f2d583eb418f2376f141757a · tweag/nix-hour · GitHub

save it somewhere as executable.

2. I add these key-bindings in helix:

[keys.normal."t"]
a = ":run-shell-command zellij run -d right -- helix-wezterm-script.sh all"
f = ":run-shell-command zellij run -d right -- helix-wezterm-script.sh file"
l = ":run-shell-command zellij run -d right -- helix-wezterm-script.sh line"

And now you can run tl in a test file and it will run the test on that line in split.

Hopefully this is useful to someone.

I noticed that the syntax highlighting for HEEX files was not correct with just adding “heex” to the file types but adding “html.heex” did the trick for me:

[[language]]
name = “elixir”
scope = “source.elixir”
injection-regex = “elixir”
file-types = [“ex”, “exs”, “html.heex”]
roots = [“mix.exs”]
auto-format = true
diagnostic-severity = “Hint”
comment-token = “#”
indent = {tab-width = 2, unit = " "}
language-server = {command = “elixir-ls”}