initial commit

Author: willruggiano

.github/workflows/ci.yml

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+name: ci
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        pg:
+          - v17
+    runs-on: namespace-profile-cached-amd64-lg
+    steps:
+      - uses: actions/checkout@v4
+      - uses: namespacelabs/nscloud-cache-action@v1
+        with:
+          path: |
+            /nix
+      - uses: cachix/install-nix-action@v31
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+          extra_nix_config: |
+            accept-flake-config = true
+      - uses: cachix/cachix-action@v16
+        with:
+          name: willruggiano
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix flake check
+      - run: nix build .#${{ matrix.pg }}
+      - run: nix run .#devenv -- up -D
+      - run: nix develop -c pg_prove test.sql
+      - run: nix run .#devenv down

.gitignore

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+# This file is for project-specific build artifacts.
+# If you have OS-specific or editor-specific files to ignore,
+# such as *.swp or .DS_Store, put those in your global
+# ~/.gitignore and put this in your ~/.gitconfig:
+#
+# [core]
+#     excludesfile = ~/.gitignore
+#
+# Cheers!
+# -rugg
+
+data
+result

README.md

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+# PostgreSQL implementation of JSON Patch
+
+[https://datatracker.ietf.org/doc/html/rfc6902]
+
+```sql
+select jsonb_patch(
+  '{"foo":{"bar":"baz","waldo":"fred"},"qux":{"corge":"grault"}}',
+  '[{"op":"move","from":"/foo/waldo","path":"/qux/thud"}]'
+);
+                             jsonb_patch                             
+---------------------------------------------------------------------
+ {"foo": {"bar": "baz"}, "qux": {"thud": "fred", "corge": "grault"}}
+(1 row)
+```
+
+See [./test.sql] for more examples.
+I have not yet written tests for A.11-A.15 from the RFC.

flake.lock

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+{
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    process-compose.url = "github:Platonic-Systems/process-compose-flake";
+    services.url = "github:juspay/services-flake";
+  };
+
+  nixConfig = {
+    extra-substituters = [
+      "https://nix-community.cachix.org"
+      "https://willruggiano.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "willruggiano.cachix.org-1:rz00ME8/uQfWe+tN3njwK5vc7P8GLWu9qbAjjJbLoSw="
+    ];
+  };
+
+  outputs = inputs @ {flake-parts, ...}:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      imports = [
+        inputs.process-compose.flakeModule
+      ];
+      systems = ["x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin"];
+      perSystem = {
+        config,
+        self',
+        inputs',
+        lib,
+        pkgs,
+        system,
+        ...
+      }: {
+        devShells.default = pkgs.mkShell {
+          name = "pg_jsonpatch";
+          buildInputs = with pkgs; [
+            postgresql
+            perlPackages.TAPParserSourceHandlerpgTAP # pg_prove
+          ];
+          PGDATA = "data/pg1";
+          PGHOST = "localhost";
+          PGDATABASE = "postgres";
+        };
+
+        packages = {
+          default = pkgs.callPackage ./package.nix {inherit (pkgs) postgresql;};
+          v17 = pkgs.callPackage ./package.nix {postgresql = pkgs.postgresql_17;};
+          v16 = pkgs.callPackage ./package.nix {postgresql = pkgs.postgresql_16;};
+          v15 = pkgs.callPackage ./package.nix {postgresql = pkgs.postgresql_15;};
+          v14 = pkgs.callPackage ./package.nix {postgresql = pkgs.postgresql_14;};
+        };
+
+        process-compose.devenv = {
+          imports = [
+            inputs.services.processComposeModules.default
+          ];
+
+          cli.options.no-server = false;
+
+          services.postgres.default = {
+            enable = true;
+            extensions = exts:
+              with exts; [
+                config.packages.default
+                pgtap
+              ];
+            initialScript.after = ''
+              create extension pgtap;
+            '';
+            package = config.packages.default.postgresql;
+            settings = {
+              log_statement = "all";
+              logging_collector = false;
+            };
+          };
+        };
+      };
+    };
+}

flake.nix

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+{
+  postgresql,
+  lib,
+}:
+postgresql.stdenv.mkDerivation {
+  pname = "pg_jsonpatch";
+  version = "1.0.0";
+  src = ./.;
+  dontBuild = true;
+  installPhase = ''
+    mkdir -p $out/share/postgresql/extension
+    cp pg_jsonpatch* $out/share/postgresql/extension
+  '';
+  meta = {
+    description = "PostgreSQL implementation of JSON Patch";
+    license = lib.licenses.mit;
+    inherit (postgresql.meta) platforms;
+  };
+  passthru = {inherit postgresql;};
+}