Add a new build script written with python.

build.py

@@ -0,0 +1,97 @@
+# Build script of unrealcv, supports win, linux and mac.
+# Weichao Qiu @ 2017
+
+import subprocess, sys, os, argparse, platform, logging, glob, shutil
+try: input = raw_input
+except NameError: pass
+logger = logging.getLogger(__name__)
+
+# Python and UE4 use different names for platform, in this script we will use UE4 platform name exclusively
+def get_platform_name():
+    py2UE4 = {"Darwin": "Mac", "Windows": "Win64", "Linux": "Linux"}
+    # Key: python platform name, Value: UE4
+    platform_name = py2UE4.get(platform.system())
+    if not platform_name:
+        logger.error('Can not recognize platform %s' % platform.system())
+    return platform_name
+
+def UATPath(UE4_dir):
+    platform2UATRelativePath = {
+        'Linux': 'Engine/Build/BatchFiles/RunUAT.sh',
+        'Mac': 'Engine/Build/BatchFiles/RunUAT.sh',
+        'Win64': 'Engine\\Build\\BatchFiles\\RunUAT.bat'
+    }
+    platform_name = get_platform_name()
+    UAT_relative_path = platform2UATRelativePath.get(platform_name)
+    UAT_abs_path = os.path.join(UE4_dir, UAT_relative_path)
+    return UAT_abs_path
+
+def UE4_discover():
+    win_candidates = [
+        'C:\Program Files\Epic Games\UE_4.??',
+        'D:\Program Files\Epic Games\UE_4.??',]
+    linux_candidates = [
+        os.path.expanduser('~/UnrealEngine'), os.path.expanduser('~/workspace/UnrealEngine'),]
+    mac_candidates = []
+    search_candidates = {'Linux': linux_candidates, 'Mac': mac_candidates, 'Win64': win_candidates}
+    candidates = search_candidates.get(get_platform_name())
+
+    found_UE4 = []
+    for c in candidates: found_UE4 += glob.glob(c)
+    # Ask user to make a selection
+    if len(found_UE4) == 1: return found_UE4[0]
+    if len(found_UE4) == 0:
+        logger.info('Can not automatically found a UE4 path, please specify it with --UE4')
+
+    print('Found UE4 in the following path, please make a selection:')
+    print('\n'.join('%d : %s' % (i+1, found_UE4[i]) for i in range(len(found_UE4))))
+
+    num = int(input())
+    return found_UE4[num-1]
+
+def install(UE4_dir):
+    engine_plugin_folder = os.path.join(UE4_dir, 'Engine', 'Plugins')
+    abs_tgt_unrealcv_folder = os.path.join(engine_plugin_folder, 'UnrealCV')
+    abs_src_unrealcv_folder = os.path.abspath('Plugins/UnrealCV')
+
+    if os.path.isdir(abs_tgt_unrealcv_folder):
+        print('UnrealCV is already found in the Engine/Plugins folder, do you want to overwrite')
+        print('Type yes or y to continue:')
+        choice = input()
+        if choice.lower() not in ['y', 'yes']:
+            print('Installation cancelled')
+            return
+        else:
+            shutil.rmtree(abs_tgt_unrealcv_folder)
+
+    shutil.copytree(abs_src_unrealcv_folder, abs_tgt_unrealcv_folder)
+    print('Installation of UnrealCV is successful.')
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--UE4')
+    parser.add_argument('--install', action='store_true')
+
+    args = parser.parse_args()
+    need_install = args.install
+
+    # TODO: Try to get UE4 path from the argument or from os.environ first
+    UE4_dir = UE4_discover()
+    abs_UAT_path = os.path.abspath(UATPath(UE4_dir))
+
+    # unrealcv_folder = os.environ.get('UnrealCV')
+    unrealcv_descriptor = 'UnrealCV.uplugin'
+    abs_unrealcv_descriptor = os.path.abspath(unrealcv_descriptor)
+    abs_output_folder = os.path.abspath('Plugins/UnrealCV')
+    platform_name = get_platform_name()
+    script_dir = os.path.dirname(os.path.realpath(__file__))
+
+    subprocess.call([
+        abs_UAT_path, 'BuildPlugin',
+        '-plugin=%s' % abs_unrealcv_descriptor,
+        '-package=%s' % abs_output_folder,
+        '-rocket', '-targetplatforms=%s' % platform_name
+    ], cwd = script_dir)
+
+    if need_install:
+        install(UE4_dir)