push sheeet

pkgs/servers/sql/postgresql/ext/pg_similarity.nix

@@ -0,0 +1,43 @@
+{
+  fetchFromGitHub,
+  fetchpatch,
+  lib,
+  postgresql,
+  postgresqlBuildExtension,
+}:
+
+postgresqlBuildExtension {
+  pname = "pg_similarity";
+  version = "pg_similarity_1_0-unstable-2021-01-12";
+
+  src = fetchFromGitHub {
+    owner = "eulerto";
+    repo = "pg_similarity";
+    rev = "b9cb0a2d501b91e33cd1ef550b05483ca3563f71";
+    hash = "sha256-L04ANvyfzHgW7fINeJEY6T77Vojq3SI8P1TWiCRSPs0=";
+  };
+
+  patches = [
+    (fetchpatch {
+      # https://github.com/eulerto/pg_similarity/pull/43
+      # Also applied in debian as https://sources.debian.org/data/main/p/pg-similarity/1.0-8/debian/patches/pg16
+      name = "pg16.patch";
+      url = "https://github.com/eulerto/pg_similarity/commit/f7781ea5ace80f697a8249e03e3ce47d4b0f6b2f.patch";
+      hash = "sha256-MPDvWfNzSg28lXL5u5/Un9pOCJjqJ4Fz9b8XCfalgts=";
+    })
+  ];
+
+  makeFlags = [ "USE_PGXS=1" ];
+
+  meta = {
+    description = "Extension to support similarity queries on PostgreSQL";
+    longDescription = ''
+      pg_similarity is an extension to support similarity queries on PostgreSQL. The implementation
+      is tightly integrated in the RDBMS in the sense that it defines operators so instead of the traditional
+      operators (= and <>) you can use ~~~ and ~!~ (any of these operators represents a similarity function).
+    '';
+    platforms = postgresql.meta.platforms;
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ danbst ];
+  };
+}