Re-add git.properties (#3287)

Co-authored-by: Camotoy <20743703+Camotoy@users.noreply.github.com>

core/build.gradle.kts

@@ -79,23 +79,65 @@ configurations.api {
     exclude(group = "io.netty.incubator", module = "netty-incubator-transport-native-io_uring")
 }
 
+tasks.processResources {
+    // This is solely for backwards compatibility for other programs that used this file before the switch to gradle.
+    // It used to be generated by the maven Git-Commit-Id-Plugin
+    filesMatching("git.properties") {
+        val info = GitInfo()
+        expand(
+            "branch" to info.branch,
+            "buildNumber" to info.buildNumber,
+            "projectVersion" to project.version,
+            "commit" to info.commit,
+            "commitAbbrev" to info.commitAbbrev,
+            "commitMessage" to info.commitMessage,
+            "repository" to info.repository
+        )
+    }
+}
+
 configure<BlossomExtension> {
-    val indra = the<IndraGitExtension>()
-
     val mainFile = "src/main/java/org/geysermc/geyser/GeyserImpl.java"
-    // On Jenkins, a detached head is checked out, so indra cannot determine the branch. Fortunately, this environment variable is available.
-    val branchName = indra.branchName() ?: System.getenv("BRANCH_NAME") ?: "DEV"
-    val commit = indra.commit()
-    val git = indra.git()
-    val gitVersion = "git-${branchName}-${commit?.name?.substring(0, 7) ?: "0000000"}"
+    val info = GitInfo()
 
-    replaceToken("\${version}", "${project.version} ($gitVersion)", mainFile)
-    replaceToken("\${gitVersion}", gitVersion, mainFile)
-    replaceToken("\${buildNumber}", buildNumber(), mainFile)
-    replaceToken("\${branch}", branchName, mainFile)
-    if (commit != null && commit.name != null) replaceToken("\${commit}", commit.name, mainFile)
-    if (git != null) replaceToken("\${repository}", git.repository.config.getString("remote", "origin", "url"))
+    replaceToken("\${version}", "${project.version} (${info.gitVersion})", mainFile)
+    replaceToken("\${gitVersion}", info.gitVersion, mainFile)
+    replaceToken("\${buildNumber}", info.buildNumber, mainFile)
+    replaceToken("\${branch}", info.branch, mainFile)
+    replaceToken("\${commit}", info.commit, mainFile)
+    replaceToken("\${repository}", info.repository, mainFile)
 }
 
 fun Project.buildNumber(): Int =
     Integer.parseInt(System.getenv("BUILD_NUMBER") ?: "-1")
+
+inner class GitInfo {
+    val branch: String
+    val commit: String
+    val commitAbbrev: String
+
+    val gitVersion: String
+    val version: String
+    val buildNumber: Int
+
+    val commitMessage: String
+    val repository: String
+
+    init {
+        // On Jenkins, a detached head is checked out, so indra cannot determine the branch.
+        // Fortunately, this environment variable is available.
+        branch = indraGit.branchName() ?: System.getenv("BRANCH_NAME") ?: "DEV"
+
+        val commit = indraGit.commit()
+        this.commit = commit?.name ?: "0".repeat(40)
+        commitAbbrev = commit?.name?.substring(0, 7) ?: "0".repeat(7)
+
+        gitVersion = "git-${branch}-${commitAbbrev}"
+        version = "${project.version} ($gitVersion)"
+        buildNumber = buildNumber()
+
+        val git = indraGit.git()
+        commitMessage = git?.commit()?.message ?: ""
+        repository = git?.repository?.config?.getString("remote", "origin", "url") ?: ""
+    }
+}

core/src/main/resources/git.properties

@@ -0,0 +1,7 @@
+git.branch=${branch}
+git.build.number=${buildNumber}
+git.build.version=${projectVersion}
+git.commit.id=${commit}
+git.commit.id.abbrev=${commitAbbrev}
+git.commit.message.full=${commitMessage}
+git.remote.origin.url=${repository}