rename berkeley-db4 => berkeley-db@4

Formula/berkeley-db@4.rb

@@ -1,4 +1,4 @@
-class BerkeleyDb4 < Formula
+class BerkeleyDbAT4 < Formula
   desc "High performance key/value database"
   homepage "https://www.oracle.com/technology/products/berkeley-db/index.html"
   url "http://download.oracle.com/berkeley-db/db-4.8.30.tar.gz"
@@ -13,7 +13,7 @@ class BerkeleyDb4 < Formula
     sha256 "04fc8d3b03381d87b3852ac1756dd144a10e7ac47444fa3e81dec0fc8ea33d25" => :mountain_lion
   end
 
-  keg_only "BDB 4.8.30 is provided for software that doesn't compile against newer versions."
+  keg_only :versioned_formula
 
   # Fix build under Xcode 4.6
   patch :DATA
@@ -22,10 +22,12 @@ class BerkeleyDb4 < Formula
     # BerkeleyDB dislikes parallel builds
     ENV.deparallelize
 
-    args = ["--disable-debug",
-            "--prefix=#{prefix}",
-            "--mandir=#{man}",
-            "--enable-cxx"]
+    args = %W[
+      --disable-debug
+      --prefix=#{prefix}
+      --mandir=#{man}
+      --enable-cxx
+    ]
 
     # BerkeleyDB requires you to build everything from the build_unix subdirectory
     cd "build_unix" do
@@ -37,6 +39,38 @@ class BerkeleyDb4 < Formula
       mv prefix+"docs", doc
     end
   end
+
+  test do
+    (testpath/"test.cpp").write <<-EOS.undent
+      #include <assert.h>
+      #include <string.h>
+      #include <db_cxx.h>
+      int main() {
+        Db db(NULL, 0);
+        assert(db.open(NULL, "test.db", NULL, DB_BTREE, DB_CREATE, 0) == 0);
+
+        const char *project = "Homebrew";
+        const char *stored_description = "The missing package manager for macOS";
+        Dbt key(const_cast<char *>(project), strlen(project) + 1);
+        Dbt stored_data(const_cast<char *>(stored_description), strlen(stored_description) + 1);
+        assert(db.put(NULL, &key, &stored_data, DB_NOOVERWRITE) == 0);
+
+        Dbt returned_data;
+        assert(db.get(NULL, &key, &returned_data, 0) == 0);
+        assert(strcmp(stored_description, (const char *)(returned_data.get_data())) == 0);
+
+        assert(db.close(0) == 0);
+      }
+    EOS
+    flags = %W[
+      -I#{include}
+      -L#{lib}
+      -ldb_cxx
+    ]
+    system ENV.cxx, "test.cpp", "-o", "test", *flags
+    system "./test"
+    assert (testpath/"test.db").exist?
+  end
 end
 
 __END__

formula_renames.json

@@ -10,6 +10,7 @@
   "autoconf264": "autoconf@264",
   "automake112": "automake@112",
   "beanstalk": "beanstalkd",
+  "berkeley-db4": "berkeley-db@4",
   "cloog-ppl015": "cloog@0.15",
   "cloog018": "cloog",
   "commonmark": "cmark",