Mappings Version Resolver

Mappings Version Resolver is a maven plugin for resolving the mappings version used by the provided Spigot server (or fork).

It can be used to automatically have the correct mappings version inside the compiled plugin without having to manually update it for every new minecraft version (or mapping change).

Plugin documentation: https://frengor.com/maven-plugins/MappingsVersionResolver/
Usage with maven: https://frengor.com/maven-plugins/MappingsVersionResolver/usage.html
Example of automation with templating-maven-plugin: https://frengor.com/maven-plugins/MappingsVersionResolver/examples/example-templating.html

Maven instructions

Copied from Usage

The plugin is published on the fren_gor repo:

<pluginRepositories>
    <pluginRepository>
        <id>fren_gor</id>
        <url>https://nexus.frengor.com/repository/public/</url>
    </pluginRepository>
</pluginRepositories>

The mappings version is resolved using the server artifact (or path to the server's file) provided in the server parameter.
The resolved version is put into the property specified into the outputProperty parameter. If not specified, the default value is resolvedMappingsVersion.

<plugins>
    <plugin>
        <groupId>com.frengor</groupId>
        <artifactId>mappings-version-resolver-maven-plugin</artifactId>
        <version>1.0.0</version>
        <executions>
            <execution>
                <goals>
                    <goal>resolve-mappings-version</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <!-- Spigot artifact (or fork) -->
            <server>org.spigotmc:spigot:SPIGOT VERSION</server>

            <!-- Optional, the default value is resolvedMappingsVersion -->
            <outputProperty>resolvedMappingsVersion</outputProperty>
        </configuration>
    </plugin>
</plugins>

From the command line

The following command can be used to print the mappings version on the command line:

mvn com.frengor:mappings-version-resolver-maven-plugin:resolve-mappings-version -Dserver=org.spigotmc:spigot:SPIGOT-VERSION \
        help:evaluate -Dexpression=resolvedMappingsVersion -q -DforceStdout

Checking the mappings version

The string obtained using the Mappings Version Resolver plugin can be compared with the value returned by CraftMagicNumbers.INSTANCE.getMappingsVersion():

if (!CraftMagicNumbers.INSTANCE.getMappingsVersion().equals(mappingsVersionString)) {
    throw new RuntimeException("Wrong mappings version found!");
}