add gradle task to run the crossplay engine in a single command

Author: compiler64

build.gradle

@@ -92,13 +92,19 @@ task headless(type: JavaExec, dependsOn: [':engine:build', ':example-bots:build'
 }
 
 task crossPlayPy(type: Exec, dependsOn: [':engine:build']) {
-  commandLine 'python', 'engine/src/crossplay_python/main.py', '--teamA', project.property('teamA'), '--teamB', project.property('teamB')
+  commandLine 'python', 'engine/src/crossplay_python/main.py',
+  '--teamA', (project.findProperty('languageA') == 'java' ? '/' : project.property('teamA')),
+  '--teamB', (project.findProperty('languageB') == 'java' ? '/' : project.property('teamB')),
+  '--new-process'
 }
 
+task headlessPy(dependsOn: ['headless']) {}
+headlessPy.mustRunAfter crossPlayPy
+
 // keep the client happy because it references this step
 task unpackClient() {}
 
-task run(dependsOn: ['headless', 'unpackClient']) {}
+task run(dependsOn: ['crossPlayPy', 'headlessPy', 'unpackClient']) {}
 
 task runClient {
   doLast {

engine/build.gradle

@@ -55,7 +55,7 @@ dependencies {
 
     [group: 'net.sf.trove4j', name: 'trove4j', version: '2.1.0'],
 
-    [group: 'org.json', name: 'json', version: '20250517'],
+    [group: 'org.json', name: 'json', version: '20251224'],
   )
   // implementation files('lib/jsi-1.0.jar')
 

engine/src/crossplay_python/main.py

@@ -3,15 +3,16 @@
 
 import os
 from argparse import ArgumentParser
-from collections import OrderedDict
+from subprocess import Popen
+DETACHED_PROCESS = 0x00000008
 
 from crossplay_python.runner import RobotRunner
 from crossplay_python.crossplay import BYTECODE_LIMIT, CrossPlayLiteral as lit, \
     CrossPlayMessage as mess, CrossPlayMethod as m, CrossPlayObjectType as ot, \
     wait, reset_files, clear_temp_files
 from crossplay_python.wrappers import _GAME_METHODS, Team
 
-CROSSPLAY_PYTHON_DIR = "example-bots/src/crossplay_python"
+CROSSPLAY_PYTHON_DIR = "example-bots/src/crossplay_python" # TODO change for scaffold
 
 TEAM_NAMES = {
     Team.A: "A",
@@ -43,6 +44,11 @@ def format_print(*args):
     return format_print
 
 def play(team_a=None, team_b=None, debug=False):
+    if team_a == "/":
+        team_a = None
+    if team_b == "/":
+        team_b = None
+
     print(f"Starting cross-play Python runner with teams {team_a} and {team_b}")
 
     code = {
@@ -79,11 +85,30 @@ def play(team_a=None, team_b=None, debug=False):
     finally:
         clear_temp_files()
 
-if __name__ == "__main__":
+def main():
+    if sys.version_info.major != 3 or sys.version_info.minor != 12:
+        print(f"Error: The Battlecode Python runner requires Python 3.12. Found version {sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}.")
+        sys.exit(1)
+
     parser = ArgumentParser()
     parser.add_argument("--teamA", help="Path to team A code file")
     parser.add_argument("--teamB", help="Path to team B code file")
     parser.add_argument("--debug", action="store_true", help="Enable debug mode")
+    parser.add_argument("--new-process", action="store_true", help="Start the Python runner in a new process")
     args = parser.parse_args()
 
-    play(team_a=args.teamA, team_b=args.teamB, debug=args.debug)
+    if args.new_process:
+        new_args = [sys.executable, __file__,
+                    "--teamA", args.teamA if args.teamA else "/",
+                    "--teamB", args.teamB if args.teamB else "/"]
+        
+        if args.debug:
+            new_args.append("--debug")
+
+        Popen(new_args, shell=False, stdin=None, stdout=None, stderr=None,
+            close_fds=True, creationflags=DETACHED_PROCESS)
+    else:
+        play(team_a=args.teamA, team_b=args.teamB, debug=args.debug)
+
+if __name__ == "__main__":
+    main()

gradle.properties

@@ -1,8 +1,10 @@
 # What are you trying to run?
 
+maps=DefaultSmall
 teamA=examplefuncsplayer
 teamB=examplefuncsplayer
-maps=DefaultSmall
+languageA=java
+languageB=java
 
 # Some optional configurations you can adjust as you need