openalpr: switch to opencv

Closes #85797.

Signed-off-by: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/openalpr.rb

@@ -4,7 +4,7 @@ class Openalpr < Formula
   url "https://github.com/openalpr/openalpr/archive/v2.3.0.tar.gz"
   sha256 "1cfcaab6f06e9984186ee19633a949158c0e2aacf9264127e2f86bd97641d6b9"
   license "AGPL-3.0-or-later"
-  revision 1
+  revision 2
 
   bottle do
     sha256 big_sur:  "32953a90e352cc25eea99daad7fac67c7ce11f042fe366af029b16cc3f372c07"
@@ -16,23 +16,87 @@ class Openalpr < Formula
   depends_on "leptonica"
   depends_on "libtiff"
   depends_on "log4cplus"
-  depends_on "opencv@2"
+  depends_on "opencv"
+  depends_on "python@3.9"
   depends_on "tesseract"
 
+  uses_from_macos "curl"
+
+  # A photo of licence plate from https://commons.wikimedia.org/wiki/File:California_2018_license_plate_(USA).jpg
+  resource "testdata" do
+    url "https://upload.wikimedia.org/wikipedia/commons/b/b0/California_2018_license_plate_%28USA%29.jpg"
+    sha256 "dd58b62f4f75690280dd0b021b19422cef7f4f4381664d3ee512106e6f491e5c"
+  end
+
+  # Make compatible with opencv 4
+  # See https://github.com/openalpr/openalpr/pull/878
+  # Remove in the next release
+  patch do
+    url "https://github.com/openalpr/openalpr/commit/a35f0d688e546392bf15e0d1d4ef73b6bc8d179d.patch?full_index=1"
+    sha256 "c22c0773182badc6ff7a65c0a423b7a01d722788be192f1b4245b1bad8d15089"
+  end
+
+  # Fix compatibility with tesseract 4
+  # See https://github.com/openalpr/openalpr/pull/693
+  # Remove in the next release
+  patch do
+    url "https://github.com/openalpr/openalpr/commit/28e0b0fa95c12923138768d670b852242a750d0c.patch?full_index=1"
+    sha256 "3c99b8fe00f7fbdc3840cdf0453154fd8d88bba90de7636137697194b9632b30"
+  end
+
+  # Fix Alpr#is_loaded segfault in python bindings
+  # Remove in the next release
+  patch do
+    url "https://github.com/openalpr/openalpr/commit/479aa4edbfd3cd0062d73fd2e0457367b3dc522f.patch?full_index=1"
+    sha256 "c08c4be680825e97f165500290eb387a37fb5569cd01cb1e6ed42991dabee920"
+  end
+
   def install
     mkdir "src/build" do
       args = std_cmake_args
       args << "-DCMAKE_INSTALL_SYSCONFDIR=#{etc}"
       args << "-DCMAKE_CXX_FLAGS=-std=c++11"
       args << "-DCMAKE_INSTALL_SYSCONFDIR:PATH=#{etc}"
+      args << "-DWITH_BINDING_PYTHON=ON"
+      args << "-DWITH_BINDING_JAVA=OFF"
+      args << "-DWITH_BINDING_GO=OFF"
+      args << "-DWITH_TESTS=OFF"
+      args << "-DTesseract_PKGCONF_INCLUDE_DIRS=#{Formula["tesseract"].opt_include}/tesseract"
+      args << "-DTesseract_PKGCONF_LIBRARY_DIRS=#{Formula["tesseract"].opt_lib}/tesseract"
 
       system "cmake", "..", *args
       system "make", "install"
     end
+
+    (lib/"python2.7/dist-packages").rmtree
+    cd "src/bindings/python" do
+      system Formula["python@3.9"].opt_bin/"python3", *Language::Python.setup_install_args(prefix)
+    end
   end
 
   test do
-    output = shell_output("#{bin}/alpr #{test_fixtures("test.jpg")}")
-    assert_equal "No license plates found.", output.chomp
+    resource("testdata").stage { testpath.install Dir["*.jpg"].first => "plate.jpg" }
+    plate_number = "7TRR812"
+
+    assert_match plate_number, shell_output("#{bin}/alpr plate.jpg")
+
+    (testpath/"test.py").write <<~EOS
+      from openalpr import Alpr
+
+      try:
+        alpr = Alpr("us", "#{etc}/openalpr/openalpr.conf", "#{share}/openalpr/runtime_data")
+        if not alpr.is_loaded():
+          raise RuntimeError("Error loading OpenALPR")
+        alpr.set_top_n(7)
+        alpr.set_default_region("ca")
+        alpr.set_detect_region(False)
+        with open("#{testpath}/plate.jpg", "rb") as f:
+          print(alpr.recognize_array(f.read()))
+      finally:
+        if alpr:
+          alpr.unload()
+    EOS
+    output = shell_output("#{Formula["python@3"].opt_bin}/python3 #{testpath}/test.py")
+    assert_match plate_number, output
   end
 end