luvit: build from source and for M1

The formula install block downloads:
- un-checksummed files and pipes one of them into `sh`; and,
- binary executables that are installed into its prefix.

This commit fixes that by bypassing the download and building them all
from source.

Follow up to Homebrew#68787.

One of its resources still does not build for Apple Silicon. Reported
upstream at

    luvit/luvi#243

Formula/luvit.rb

@@ -4,6 +4,7 @@ class Luvit < Formula
   url "https://github.com/luvit/luvit/archive/2.17.0.tar.gz"
   sha256 "80657aa752322560fcde780212b6807b626b45d65aca3f3dae254e5c4fb0ee78"
   license "Apache-2.0"
+  revision 1
   head "https://github.com/luvit/luvit.git"
 
   bottle do
@@ -14,15 +15,68 @@ class Luvit < Formula
     sha256 "2c704b1f98b965c0b6010a897a0c951f47cb896bbbf5381e7d4ee80238692033" => :high_sierra
   end
 
+  depends_on "cmake" => :build
+  depends_on "luajit-openresty" => :build
+  depends_on "luv" => :build
   depends_on "pkg-config" => :build
-  depends_on "luajit"
+  depends_on "libuv"
   depends_on "openssl@1.1"
+  depends_on "pcre"
+
+  # To update this resource, check LIT_VERSION in the Makefile:
+  # https://github.com/luvit/luvit/blob/#{version}/Makefile
+  resource "lit" do
+    url "https://github.com/luvit/lit.git",
+        tag:      "3.8.1",
+        revision: "27114d94b9299437b2229eac6a6c3a9ef41fa83a"
+  end
+
+  # To update this resource, check LUVI_VERSION in
+  # https://github.com/luvit/lit/raw/$(LIT_VERSION)/get-lit.sh
+  resource "luvi" do
+    url "https://github.com/luvit/luvi.git",
+        tag:      "v2.11.0",
+        revision: "9da12caaf01337ef0609d07b2af9a5296c13922a"
+  end
 
   def install
-    ENV["USE_SYSTEM_SSL"] = "1"
-    ENV["USE_SYSTEM_LUAJIT"] = "1"
     ENV["PREFIX"] = prefix
-    system "make"
+    luajit = Formula["luajit-openresty"]
+
+    resource("luvi").stage do
+      # Build scripts set LUA_PATH before invoking LuaJIT, but that causes errors.
+      # Reported at https://github.com/luvit/luvi/issues/242
+      inreplace "cmake/Modules/LuaJITAddExecutable.cmake",
+                "COMMAND \"LUA_PATH=${LUA_PATH}\" luajit", "COMMAND luajit"
+
+      # Build scripts double the prefix of this directory, so we set it manually.
+      # Reported in the issue linked above.
+      ENV["LPEGLIB_DIR"] = "deps/lpeg"
+
+      # CMake flags adapted from
+      # https://github.com/luvit/luvi/blob/#{luvi_version}/Makefile#L73-L74
+      luvi_args = std_cmake_args + %W[
+        -DWithOpenSSL=ON
+        -DWithSharedOpenSSL=ON
+        -DWithPCRE=ON
+        -DWithLPEG=ON
+        -DWithSharedPCRE=ON
+        -DWithSharedLibluv=ON
+        -DLIBLUV_INCLUDE_DIR=#{Formula["luv"].opt_include}/luv
+        -DLIBLUV_LIBRARIES=#{Formula["luv"].opt_lib}/libluv_a.a
+        -DLUAJIT_INCLUDE_DIR=#{luajit.opt_include}/luajit-2.1
+        -DLUAJIT_LIBRARIES=#{luajit.opt_lib}/libluajit.a
+      ]
+
+      system "cmake", ".", "-B", "build", *luvi_args
+      system "cmake", "--build", "build"
+      buildpath.install "build/luvi"
+    end
+
+    resource("lit").stage do
+      system buildpath/"luvi", ".", "--", "make", ".", buildpath/"lit", buildpath/"luvi"
+    end
+
     system "make", "install"
   end