brew --prefix <formula>, but for libexec

[asbjornu]

I want to add a caveat to the dotnet formula to inform users how to set the DOTNET_ROOT variable to the installation path of the formula. Instead of just printing the static path of #{libexec} to the terminal, which would require a change to the export DOTNET_ROOT statement on every upgrade of the formula, I would prefer the instructions to be something like this:

export DOTNET_ROOT="$(brew --libexec dotnet)"

Now --libexec is not a valid argument to the brew command, but it would be nice if it was. brew info does return the path to libexec, but not in isolation so it would require performing sed or similar on the output to dig out just the path to libexec.

How do I best accomplish this with Homebrew? Is there a best practice for this?

[SMillerDev]

Why not #{opt_libexec} if it exists? That one won't change with each version.

[asbjornu]

That seems to work great, thanks @SMillerDev! I submitted Homebrew/homebrew-core#69323 using #{opt_libexec}.