luarocks: migrate into lua formulae

This PR ‘pythonises’ the Lua setup. There have been requests for us to
do this for a while, and it’s a good idea - It’s just taken me a while
to finish ironing out.

The individual luarocks formula dies entirely, in favour of luarocks
being vendored into the two Lua formulae in Homebrew/homebrew with
versioned trees.

This provides roughly the same experience we deliver with pip
and co from Python.

Luajit is not yet supported, because it’s being a pain, but Luajit
support will land in the semi-near future, as will support for Lua53
in Versions. All 4 installations can sit side-by-side with no non-binary
conflict. Binary conflict is handled roughly the same way Python
handles it sadly, which is regrettable but presently unavoidable.

1 files changed, 66 insertions, 12 deletions

diff --git a/Library/Formula/lua51.rb b/Library/Formula/lua51.rb
index 109605e5a..09c1fe89b 100644
--- a/Library/Formula/lua51.rb
+++ b/Library/Formula/lua51.rb
@@ -1,12 +1,11 @@
-require "formula"
-
 class Lua51 < Formula
   # 5.2 is not fully backwards compatible so we must retain 2 Luas for now.
   # The transition has begun. Lua will now become Lua51, and Lua52 will become Lua.
   homepage "http://www.lua.org/"
   url "http://www.lua.org/ftp/lua-5.1.5.tar.gz"
   mirror "https://mirrors.kernel.org/debian/pool/main/l/lua5.1/lua5.1_5.1.5.orig.tar.gz"
-  sha1 "b3882111ad02ecc6b972f8c1241647905cb2e3fc"
+  sha256 "2640fc56a795f29d28ef15e13c34a47e223960b0240e8cb0a82d9b0738695333"
+  revision 1
 
   bottle do
     revision 1
@@ -23,6 +22,7 @@ class Lua51 < Formula
   option :universal
   option "with-completion", "Enables advanced readline support"
   option "without-sigaction", "Revert to ANSI signal instead of improved POSIX sigaction"
+  option "without-luarocks", "Don't build with Luarocks support embedded"
 
   # Be sure to build a dylib, or else runtime modules will pull in another static copy of liblua = crashy
   # See: https://github.com/Homebrew/homebrew/pull/5043
@@ -30,17 +30,26 @@ class Lua51 < Formula
 
   # sigaction provided by posix signalling power patch from
   # http://lua-users.org/wiki/LuaPowerPatches
-  patch do
-    url "http://lua-users.org/files/wiki_insecure/power_patches/5.1/sig_catch.patch"
-    sha1 "19f361f0c590f80fccd033486cbee6c9dc8616c8"
-  end if build.with? "sigaction"
+  if build.with? "completion"
+    patch do
+      url "http://lua-users.org/files/wiki_insecure/power_patches/5.1/sig_catch.patch"
+      sha256 "221435dedd84a386e2d40454e6260a678286bfb7128afa18a4339e5fdda9c8f2"
+    end
+  end
 
   # completion provided by advanced readline power patch from
   # http://lua-users.org/wiki/LuaPowerPatches
-  patch do
-    url "http://luajit.org/patches/lua-5.1.4-advanced_readline.patch"
-    sha1 "3cfe2eb027b51202923d20042ae37f3249508664"
-  end if build.with? "completion"
+  if build.with? "completion"
+    patch do
+      url "http://luajit.org/patches/lua-5.1.4-advanced_readline.patch"
+      sha256 "dfd17e720d1079dcb64529af3e4fea4a4abc0115c934f365282a489d134cceb4"
+    end
+  end
+
+  resource "luarocks" do
+    url "https://github.com/keplerproject/luarocks/archive/v2.2.1.tar.gz"
+    sha256 "30e5bd99f82f5e3ea174572c1831f9ff83dfe37727f9fcfc89168b4572193571"
+  end
 
   def install
     ENV.universal_binary if build.universal?
@@ -73,7 +82,6 @@ class Lua51 < Formula
     # Renaming from Lua to Lua51.
     # Note that the naming must be both lua-version & lua.version.
     # Software can't find the libraries without supporting both the hyphen or full stop.
-
     mv "#{bin}/lua", "#{bin}/lua-5.1"
     mv "#{bin}/luac", "#{bin}/luac-5.1"
     mv "#{man1}/lua.1", "#{man1}/lua-5.1.1"
@@ -83,10 +91,56 @@ class Lua51 < Formula
     ln_s "#{include}/lua-5.1", "#{include}/lua5.1"
     ln_s "#{bin}/lua-5.1", "#{bin}/lua5.1"
     ln_s "#{bin}/luac-5.1", "#{bin}/luac5.1"
+
+    # This resource must be handled after the main install, since there's a lua dep.
+    # Keeping it in install rather than postinstall means we can bottle.
+    if build.with? "luarocks"
+      resource("luarocks").stage do
+        ENV.prepend_path "PATH", bin
+        lua_prefix = prefix
+
+        system "./configure", "--prefix=#{libexec}", "--rocks-tree=#{HOMEBREW_PREFIX}",
+                              "--sysconfdir=#{etc}/luarocks51", "--with-lua=#{lua_prefix}",
+                              "--lua-version=5.1", "--versioned-rocks-dir", "--force-config=#{etc}/luarocks51"
+        system "make", "build"
+        system "make", "install"
+
+        (share+"lua/5.1/luarocks").install_symlink Dir["#{libexec}/share/lua/5.1/luarocks/*"]
+        bin.install_symlink libexec/"bin/luarocks-5.1"
+        bin.install_symlink libexec/"bin/luarocks-admin-5.1"
+
+        # This block ensures luarock exec scripts don't break across updates.
+        inreplace libexec/"share/lua/5.1/luarocks/site_config.lua" do |s|
+          s.gsub! "#{HOMEBREW_CELLAR}/lua51/#{pkg_version}/libexec", "#{Formula["lua51"].opt_libexec}"
+          s.gsub! "#{HOMEBREW_CELLAR}/lua51/#{pkg_version}/include", "#{HOMEBREW_PREFIX}/include"
+          s.gsub! "#{HOMEBREW_CELLAR}/lua51/#{pkg_version}/lib", "#{HOMEBREW_PREFIX}/lib"
+          s.gsub! "#{HOMEBREW_CELLAR}/lua51/#{pkg_version}/bin", "#{HOMEBREW_PREFIX}/bin"
+        end
+      end
+    end
+  end
+
+  def caveats; <<-EOS.undent
+    Please be aware due to the way Luarocks is designed any binaries installed
+    via Luarocks-5.2 AND 5.1 will overwrite each other in #{HOMEBREW_PREFIX}/bin.
+
+    This is, for now, unavoidable. If this is troublesome for you, you can build
+    rocks with the `--tree=` command to a special, non-conflicting location and
+    then add that to your `$PATH`.
+
+    If you have existing Rocks trees in $HOME, you will need to migrate them to the new
+    location manually. You will only have to do this once.
+    EOS
   end
 
   test do
     system "#{bin}/lua5.1", "-e", "print ('Ducks are cool')"
+
+    if File.exist?(bin/"luarocks-5.1")
+      mkdir testpath/"luarocks"
+      system bin/"luarocks-5.1", "install", "moonscript", "--tree=#{testpath}/luarocks"
+      assert File.exist? testpath/"luarocks/bin/moon"
+    end
   end
 end