For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/openSUSE_Tumbleweed/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/openSUSE_Leap_15.2/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/openSUSE_Leap_15.1/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/openSUSE_Leap_15.0/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/15.5/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:windowmanagers/15.4/home:AndnoVember:windowmanagers.repo
zypper refresh
zypper install rubygem-asciidoctor