How to refer to arch or the app name in *flight_steps

[muzimuzhi]

I'm migrating deprecated postflight stanza to postflight_steps for casks in texstudio-org/texstudio tap.

The old postflight stanza looks like the following. Note that the app name contains both version and arch.

cask "texstudio@beta" do
  arch arm: "-m1"

  # ...

  # It's NOT recommended to rename the target only for removing version numbers.
  # https://docs.brew.sh/Cask-Cookbook#target-should-only-be-used-in-select-cases
  app "texstudio-#{version}-osx#{arch}.app"

  # learnt from https://github.com/Homebrew/homebrew-cask/blob/03a0edb4616198f6f64b285dbf842bc3b73a7f31/Casks/p/parallels.rb#L36-L41
  postflight do
    system_command "xattr",
                   args: ["-dr", "com.apple.quarantine", "#{appdir}/texstudio-#{version}-osx#{arch}.app"]
  end

  # ...

end

I tried to change postflight to the following postflight_steps, but in args:

• using {{arch}} then it's left verbatim
• using #{arch} then error undefined local variable or method 'arch' is reported

  postflight_steps do
    run "xattr",
        args: ["-dr", "com.apple.quarantine", "{{appdir}}/texstudio-{{version}}-osx{{arch}}.app"]
  end

How to refer to the arch, or the app name composed in app stanza in *flight_steps?

[muzimuzhi]

Currently I'm duplicating postflight_steps in on_arm and on_intel blocks. texstudio-org/homebrew-texstudio@59b779d

  on_arm do
    postflight_steps do
      run "xattr",
          args: ["-dr", "com.apple.quarantine", "{{appdir}}/texstudio-{{version}}-osx-m1.app"]
    end
  end
  on_intel do
    postflight_steps do
      run "xattr",
          args: ["-dr", "com.apple.quarantine", "{{appdir}}/texstudio-{{version}}-osx.app"]
    end
  end

[daeho-ro]

arch token is missing for the stap, I have opened a PR here,

• install steps: add {{arch}} template token brew#23836