Combine sbarex-qlmarkdown with qlmarkdown for compatibility

[elsiehupp]

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I'm not sure if this is the correct approach, but the problem I'm trying to solve is that the existing qlmarkdown is abandoned and does not work on Catalina or later (and this is a known issue), while sbarex-qlmarkdown works exclusively with Catalina or later but has limited discoverability.

I haven't consulted with either @toland or @sbarex about this, and the README at sbarex/QLMarkdown would need to be updated with the new cask name.

I did install and uninstall on both macOS Big Sur and macOS High Sierra, but I'm not sure if I ran them correctly. brew install --cask path/to/qlmarkdown.rb on Big Sur reported no errors correctly and correctly installed the application, while on High Sierra it reported no errors but seemingly did not actually install anything. In both cases brew uninstall --cask path/to/qlmarkdown.rb worked correctly.

[miccal]

Thank you @elsiehupp but this is not the way to handle this.

I will change the name of the old qlmarkdown Cask to toland-qlmarkdown and mark it as discontinued, and then rename the old sbarex-qlmarkdown Cask to just qlmarkdown.

[elsiehupp]

@miccal yes, I wasn’t sure if this was the correct approach, so thanks for fixing the underlying problem regardless!

FWIW you probably do want something like depends_on macos: "< :catalina" on toland-qlmarkdown and something like depends_on macos: ">= :catalina" on sbarex-qlmarkdown (now just qlmarkdown). (It’s unclear whether or not toland-qlmarkdown runs on Catalina.)

[miccal]

@miccal yes, I wasn’t sure if this was the correct approach, so thanks for fixing the underlying problem regardless!

No problem.

FWIW you probably do want something like depends_on macos: "< :catalina" on toland-qlmarkdown

This seems to work on Catalina and higher if installed with the --no-quarantine flag, so unless those requirements are specified upstream we would not add it.

and something like depends_on macos: ">= :catalina" on sbarex-qlmarkdown (now just qlmarkdown). (It’s unclear whether or not toland-qlmarkdown runs on Catalina.)

This one already has a depends_on macos: ">= :catalina".