Add badge for gradle plugin portal

[StefMa]

It would be cool if we have a badge for the gradle plugin portal.

I image it like similar the maven central or the bintray badge.
(If it's working of course 🙃)

plugin portal | v0.9.95

You can use this URL for example: (don't know how shields works, but I think you need that 😄)
https://plugins.gradle.org/plugin/org.shipkit.java-publish/0.9.95

[paulmelnikow]

Hi, thanks for the suggestion. Do they have a public API?

[StefMa]

I can't find one 😞
Even something like _latest doesn't work...

[paulmelnikow]

I'm marking all the needs-upstream-help issues closed.

If there's new information from the upstream service, please post in the thread. If they're actionable by Shields, a maintainer will reopen the issue.

If anyone wants to follow up with these vendors, feel free to do that! Even though the unresolved issues are closed, they are easy to find:

https://github.com/badges/shields/issues?q=label%3Aneeds-upstream-help+is%3Aclosed

[radarsh]

In the meantime, can't we just parse the output of https://plugins.gradle.org/plugin/<plugin-id> and extract the output? This would be abstracted by the shields.io API so when Gradle does expose a public API for getting just the version, we could always update the shields.io implementation.

[paulmelnikow]

Shields has limited server resources so we avoid parsing HTML for performance reasons.

Wanted to link gradle/gradle#1477 which is the request for an API.

[loosebazooka]

@paulmelnikow I wrote a dumb parser, it should work for most cases. It currently redirects to a shield badge, which does not appear to be the way the maven badge thing works, but this is just a prototype, happy to rewrite it to match the shields.io style for plugins(?).

https://github.com/loosebazooka/gradle-plugin-badges

Actually I think this can be solved by the maven-metadata badges, I need to play around with that though.

[StefMa]

Just for reference:
#1839 & gradle/gradle#1477 (comment)

[Horcrux7]

With the maven repo https://plugins.gradle.org/m2/ and the Maven metadata URL it work for me.

[![Maven metadata URL](https://img.shields.io/maven-metadata/v?label=Plugin&metadataUrl=https%3A%2F%2Fplugins.gradle.org%2Fm2%2Fde%2Finetsoftware%2Fjwebassembly%2Fde.inetsoftware.jwebassembly.gradle.plugin%2Fmaven-metadata.xml)](https://plugins.gradle.org/plugin/de.inetsoftware.jwebassembly)

[anatawa12]

@paulmelnikow Can you/we add the Gradle Plugin Portal badge as an alias of #1125 (comment)?

The plugin marker artifact's group id is the id of the plugin and artifact id is <gradle plugin id>.gradle.plugin so It's possible to make an alias. I think it's not undocumented or reverse-engineered API endpoints because the Plugin Marker Artifact system is documented at Using Gradle Plugins.