build.gradle

import java.util.regex.Matcher
import java.util.regex.Pattern

plugins {
    id 'net.neoforged.gradleutils' version '3.0.0'
    id 'dev.lukebemish.immaculate' version '0.1.6' apply false
    id 'net.neoforged.licenser' version '0.7.5'
    id 'neoforge.formatting-conventions'
    id 'neoforge.versioning'
}

ext.isPreReleaseVersion = project.minecraft_version.contains('w') || project.minecraft_version.contains('-')

if (isPreReleaseVersion) {
    project.version = "${project.neoforge_snapshot_next_stable}.0-alpha.${project.minecraft_version}.${(new Date()).format('yyyyMMdd.HHmmss', TimeZone.getTimeZone('UTC'))}"
} else {
    project.version = gradleutils.version.toString()
}

// Print version, generally useful to know - also appears on CI
System.out.println("NeoForge version ${project.version}")

allprojects {
    version rootProject.version
    group 'net.neoforged'

    apply plugin: 'java'

    java.toolchain.languageVersion.set(JavaLanguageVersion.of(project.java_version))
}

// Remove src/ sources from the root project. They are used in the neoforge subproject.
sourceSets {
    main {
        java {
            srcDirs = []
        }
        resources {
            srcDirs = []
        }
    }
}

// Put licenser here otherwise it tries to license all source sets including decompiled MC sources
license {
    header = file('codeformat/HEADER.txt')
    skipExistingHeaders = true
    tasks {
        neoforge {
            // Add all NeoForge sources
            files.from rootProject.fileTree("src", {
                include "**/*.java"
            })
        }
    }
}

// Put spotless here because it wants the files to live inside the project root
immaculate {
    workflows.named("java") {
        files.from rootProject.fileTree("src", {
            include "**/*.java"
        })
    }
    workflows.register("patches") {
        files.from(rootProject.fileTree("patches"))

        custom 'noImportChanges', { String fileContents ->
            if (fileContents.contains('+import') || fileContents.contains('-import')) {
                throw new GradleException("Import changes are not allowed in patches!")
            }
            return fileContents
        }

        def interfaceChange = Pattern.compile('[-+].*(implements|(interface.*extends))(.*)\\{')
        custom 'noInterfaceModifications', { String fileContents ->
            def interfaceChanges = fileContents.lines().filter { it.matches(interfaceChange) }.toList()
            if (interfaceChanges.isEmpty()) return fileContents
            String oldInterfaces = ""
            // we expect interface additions/removals in pairs of - and then +
            interfaceChanges.each { String change ->
                final match = change =~ interfaceChange
                match.find()
                final values = match.group(3).trim()
                if (change.startsWith('-')) {
                    oldInterfaces = values
                } else if (oldInterfaces != values) {
                    throw new GradleException("Modification of interfaces via patches is not allowed!")
                }
            }
            return fileContents
        }

        //Note: This doesn't detect changing access level to or from package private
        //TODO: Eventually try and make this support checking package private access level changes?
        def accessLevelChange = Pattern.compile('^[-+]\\s*(public|private|protected)\\s.*\$', Pattern.UNIX_LINES | Pattern.MULTILINE)
        custom 'noAccessWidening', { String fileContents ->
            def accessChanges = fileContents.findAll(accessLevelChange)
            if (accessChanges.isEmpty()) return fileContents
            Set<String> privateRemovals = new HashSet<>()
            Set<String> protectedRemovals = new HashSet<>()
            accessChanges.each { String change ->
                //Get the type of match
                String[] data = change.substring(1).trim().split(" ", 2)
                String lineStart = data[1].substring(0, Math.min(10, data[1].length()))
                if (change.startsWith('-')) {//Removal
                    if (data[0] == 'private') {
                        privateRemovals.add(lineStart)
                    } else if (data[0] == 'protected') {
                        protectedRemovals.add(lineStart)
                    }
                } else if (!privateRemovals.isEmpty() || !protectedRemovals.isEmpty()) {//Addition and we know of at least one removal
                    if (data[0] == 'public') {
                        if (privateRemovals.remove(lineStart) || protectedRemovals.remove(lineStart)) {
                            throw new GradleException("Widening access level via patches is not allowed, use an AT! Changed line: " + change)
                        }
                    } else if (data[0] == 'protected') {
                        if (privateRemovals.remove(lineStart)) {
                            throw new GradleException("Widening access level via patches is not allowed, use an AT! Changed line: " + change)
                        }
                        //Remove any protected ones that we have a match for
                        protectedRemovals.remove(lineStart)
                    } else if (data[0] == 'private') {
                        //Remove any private ones that we have a match for
                        privateRemovals.remove(lineStart)
                    }
                }
            }
            //Note: We allow mismatched counts in case we are removing a method entirely for some reason
            return fileContents
        }

        //Trim any trailing whitespace from patch additions
        def trailingWhitespace = Pattern.compile('^\\+.*[ \t]+\$', Pattern.UNIX_LINES | Pattern.MULTILINE)
        custom 'trimTrailingWhitespacePatches', { String fileContents ->
            Matcher matcher = trailingWhitespace.matcher(fileContents)
            StringBuilder sb = new StringBuilder()
            while (matcher.find()) {
                matcher.appendReplacement(sb, matcher.group().trim())
            }
            matcher.appendTail(sb)
            return sb.toString()
        }

        //Replace any FQN versions of javax.annotation.Nullable with the jetbrains variant
        custom 'jetbrainsNullablePatches', { String fileContents ->
            fileContents.replace('@javax.annotation.Nullable', '@org.jetbrains.annotations.Nullable')
        }
    }
}