Proof of concept for inline Luau instructions

[cipharius]

I noticed that luau --compile is neatly annotated with exact line numbers so I couldn't resist hacking together a script for my editor, which would let me check instructions of any Luau source code line:

Pretty silly, but perhaps it can get handy from time to time!

Here is my POSIX shell one-liner for parsing out the line information:

luau --compile "$FILE" | sed -ne "/^\s\+$LINE:/,/^\(\s\+\|$\)/{//!p;}"

[zeux]

Super cool :) This is just vanilla Luau.CLI, so the regex is compatible with the default output? Is this a custom Vim plugin or something off the shelf?

[cipharius]

Yeah, that is vanilla Luau.CLI, although it's not plain regex, it's sed expression.

The editor is Kakoune which is a bit different modal editor like Vim. This is the script I've made for Luau integration:

provide-module luau %{
  define-command luau-hover-instructions %{
    info -style below \
         -anchor "%val{cursor_line}.%val{cursor_char_column}" \
         %sh{luau --compile "$kak_buffile" | sed -ne "/^\s\+$kak_cursor_line:/,/^\(\s\+\|$\)/{//!p;}"}
  }

  hook global WinSetOption filetype=lua %{
    try %{
      execute-keys -draft "ggxs^--!strict\s*$<ret>"

      # Luau mode
      lint-enable
      set-option window lintcmd "%val{config}/scripts/luau-lint.sh"
      hook window BufWritePost .* lint-buffer

      map -docstring "Show current line instructions" \
          window user i ": luau-hover-instructions<ret>"
    }
  }
}

And this is the luau-lint.sh mentioned in it:

#!/bin/sh
luau-analyze "$1" 2>&1 | \
  sed -e 's/\([^(]\+\)(\([[:digit:]]\+\),\([[:digit:]]\+\))/\1:\2:\3/'