From fa276ea4d8e3c8dcbd3c07023d1eb5b594cc7d7d Mon Sep 17 00:00:00 2001
From: Miku AuahDark <auahdark687291@gmail.com>
Date: Sun, 24 Nov 2019 17:36:32 +0800
Subject: [PATCH] Detect LOVE submodule first before building.

---
 love/src/jni/Android.mk           | 11 +++++++++--
 love/src/jni/detect_androidapi.py |  2 +-
 love/src/jni/detect_love.py       | 14 ++++++++++++++
 love/src/jni/detect_ndkrel.py     |  2 +-
 4 files changed, 25 insertions(+), 4 deletions(-)
 create mode 100644 love/src/jni/detect_love.py

diff --git a/love/src/jni/Android.mk b/love/src/jni/Android.mk
index 065d1b86..1163c25b 100644
--- a/love/src/jni/Android.mk
+++ b/love/src/jni/Android.mk
@@ -1,3 +1,10 @@
-IS_NDK_R17 := $(shell python $(call my-dir)/detect_ndkrel.py $(NDK_ROOT)/source.properties 17)
-IS_ANDROID_21 := $(shell python $(call my-dir)/detect_androidapi.py $(TARGET_PLATFORM) 21)
+LOVE_JNI_DIR := $(call my-dir)
+IS_NDK_R17 := $(shell python ${LOVE_JNI_DIR}/detect_ndkrel.py $(NDK_ROOT)/source.properties 17)
+IS_ANDROID_21 := $(shell python ${LOVE_JNI_DIR}/detect_androidapi.py $(TARGET_PLATFORM) 21)
+HAS_LOVE := $(shell python ${LOVE_JNI_DIR}/detect_love.py ${LOVE_JNI_DIR})
+
+ifneq (${HAS_LOVE},yes)
+    $(error Missing LOVE. Make sure to initialize the submodule correctly!)
+endif
+
 include $(call all-subdir-makefiles)
diff --git a/love/src/jni/detect_androidapi.py b/love/src/jni/detect_androidapi.py
index dfd18cfb..80c06890 100644
--- a/love/src/jni/detect_androidapi.py
+++ b/love/src/jni/detect_androidapi.py
@@ -14,4 +14,4 @@ def main(argv):
         print("unknown")
 
 if __name__ == "__main__":
-   main(sys.argv[1:])
+    main(sys.argv[1:])
diff --git a/love/src/jni/detect_love.py b/love/src/jni/detect_love.py
new file mode 100644
index 00000000..8fc93dc9
--- /dev/null
+++ b/love/src/jni/detect_love.py
@@ -0,0 +1,14 @@
+import sys
+from os import path
+
+def main(argv):
+    if len(argv) > 0:
+        if path.isdir(argv[0] + "/love") and path.isfile(argv[0] + "/love/Android.mk"):
+            print("yes")
+        else:
+            print("no")
+    else:
+        print("no")
+
+if __name__ == "__main__":
+    main(sys.argv[1:])
diff --git a/love/src/jni/detect_ndkrel.py b/love/src/jni/detect_ndkrel.py
index 55c66360..df96a312 100644
--- a/love/src/jni/detect_ndkrel.py
+++ b/love/src/jni/detect_ndkrel.py
@@ -17,4 +17,4 @@ def main(argv):
         print("unknown")
 
 if __name__ == "__main__":
-   main(sys.argv[1:])
+    main(sys.argv[1:])