Replace Python script with Unix Shell and Powershell script.

Fixes #246.

love/src/jni/Android.mk

@@ -1,7 +1,16 @@
 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 ${LOVE_JNI_DIR})
+
+ifeq ($(OS),Windows_NT)
+    SHELL_EXECUTOR := powershell -executionpolicy unrestricted
+    SCRIPT_EXTENSION := ps1
+else
+    SHELL_EXECUTOR := sh
+    SCRIPT_EXTENSION := sh
+endif
+
+IS_NDK_R17 := $(shell ${SHELL_EXECUTOR} ${LOVE_JNI_DIR}/detect_ndkrel.${SCRIPT_EXTENSION} $(NDK_ROOT)/source.properties 17)
+IS_ANDROID_21 := $(shell ${SHELL_EXECUTOR} ${LOVE_JNI_DIR}/detect_androidapi.${SCRIPT_EXTENSION} $(TARGET_PLATFORM) 21)
+HAS_LOVE := $(shell ${SHELL_EXECUTOR} ${LOVE_JNI_DIR}/detect_love.${SCRIPT_EXTENSION} ${LOVE_JNI_DIR})
 
 ifneq (${HAS_LOVE},yes)
     $(error Missing LOVE. Make sure to initialize the submodule correctly!)

love/src/jni/detect_androidapi.ps1

@@ -0,0 +1,13 @@
+if ($args.Length -gt 1) {
+    # $args[0] = android-%d
+    # $args[1] = %d
+    $found = $args[0] -match 'android-(\d+)'
+
+    if ($found -and $matches[1] -ge $args[1]) {
+        Write-Output "yes"
+    } else {
+        Write-Output "no"
+    }
+} else {
+    Write-Output "unknown"
+}

love/src/jni/detect_androidapi.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ $# -gt 1 ]; then
+    # $1 = android-%d
+    # $2 = %d
+    version=$(echo $1 | grep -o 'android-[0-9]*' | grep -o '[0-9]*')
+
+    if [ $version -ge $2 ]; then
+        echo "yes"
+    else
+        echo "no"
+    fi
+else
+    echo "unknown"
+fi

love/src/jni/detect_love.ps1

@@ -0,0 +1,7 @@
+$path = $args[0]
+
+if (Test-Path -Path "$path/love/Android.mk") {
+    Write-Output "yes"
+} else {
+    Write-Output "no"
+}

love/src/jni/detect_love.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [ -d "$1/love" ] && [ -f "$1/love/Android.mk" ]; then
+    echo "yes"
+else
+    echo "no"
+fi

love/src/jni/detect_ndkrel.ps1

@@ -0,0 +1,15 @@
+# $args[0] = source.properties
+# $args[1] = NDK version to be checked
+
+if ($args.Count -ne 2) {
+    Write-Output "unknown"
+    exit 1
+}
+
+$ndkVersion = (Select-String -Pattern "Pkg.Revision = (\d+)" -Path $args[0] | ForEach-Object { $_.Matches[0].Groups[1].Value })
+
+if ($ndkVersion -ge $args[1]) {
+    Write-Output "yes"
+} else {
+    Write-Output "no"
+}

love/src/jni/detect_ndkrel.sh

@@ -0,0 +1,15 @@
+# $1 = source.properties
+# $2 = NDK version to be checked
+
+if [ $# -ne 2 ]; then
+    echo "unknown"
+    exit 1
+fi
+
+ndkVersion=$(grep -Po 'Pkg.Revision = (\d+)' "$1" | grep -Po '\d+')
+
+if [ "$ndkVersion" -ge "$2" ]; then
+    echo "yes"
+else
+    echo "no"
+fi