Use git username for devenv username

build.gradle.kts

@@ -4,6 +4,7 @@ import java.util.Date
 import java.text.SimpleDateFormat
 import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream
 import kotlin.text.Regex
+import java.util.UUID
 
 val mod_version: String by project
 val mc_version: String by project
@@ -211,6 +212,36 @@ minecraft {
 					source(sourceSets["main"])
 				}
 			}
+
+			val usernameStream = FastByteArrayOutputStream()
+
+			val gotUsername = exec {
+				commandLine("git", "config", "--global", "--get", "user.name")
+				workingDir(".")
+				standardOutput = usernameStream
+			}.exitValue == 0
+
+			if (gotUsername) {
+				val originalUsername = usernameStream.array.copyOfRange(0, usernameStream.length).toString(Charsets.UTF_8).trim()
+
+				if (originalUsername.isNotEmpty()) {
+					var username = originalUsername
+					var speculatedUUID = UUID.nameUUIDFromBytes("OfflinePlayer:$username".toByteArray(Charsets.UTF_8))
+					var counter = 1
+
+					while (speculatedUUID.hashCode() and 1 == 1) {
+						username = originalUsername + "_".repeat(counter)
+						speculatedUUID = UUID.nameUUIDFromBytes("OfflinePlayer:$username".toByteArray(Charsets.UTF_8))
+						counter++
+					}
+
+					args("--username", username)
+				} else {
+					args("--username", "Dev_${System.getProperty("user.name")}")
+				}
+			} else {
+				args("--username", "Dev_${System.getProperty("user.name")}")
+			}
 		}
 
 		create("server") {