SPI needs the docc-plugin installed to build the docs - this fixes that scenario

[heckj]

adds in docc-plugin package when attempting to build docs for Swift Package Index

[FranzBusch]

It actually doesn't. SPI is automatically adding this plugin

[finestructure]

We do, yes! We do check for the plugin url before adding it and don't add it if we see one (it's just a grep, nothing sophisticated 😅), so make sure you don't have in there behind a conditional or something.

[finestructure]

Essentially, we're running

            shopt -s nullglob && for manifest in Package.swift Package@*.swift ; do
            if ! grep -E -i "https://github.com/(apple|swiftlang)/swift-docc-plugin" "$manifest" ; then
            cat <<EOF >> "$manifest"

            package.dependencies.append(
                .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.0.0")
            )
            EOF
            fi
            done

[FranzBusch]

Ah I see so we need to add it ourselves. I thought you were dumping the package info and looking at the JSON output.