Add shell.nix for easier local development (#107)

.gitattributes

@@ -1,5 +1,6 @@
 Tests export-ignore
 .github export-ignore
+shell.nix export-ignore
 
 .gitattributes export-ignore
 .gitignore export-ignore

Documentation/Changelog/2.5.0.rst

@@ -21,7 +21,7 @@ Nothing
 Tasks
 -----
 
-Nothing
+* Add `shell.nix` to ease local development.
 
 Deprecation
 -----------

shell.nix

@@ -0,0 +1,89 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  php = pkgs.php82;
+  inherit(pkgs.php82Packages) composer;
+
+  projectInstall = pkgs.writeShellApplication {
+    name = "project-install";
+    runtimeInputs = [
+      php
+      composer
+    ];
+    text = ''
+      rm -rf .Build/ vendor/
+      composer update --prefer-dist --no-progress --working-dir="$PROJECT_ROOT"
+    '';
+  };
+  projectValidateComposer = pkgs.writeShellApplication {
+    name = "project-validate-composer";
+    runtimeInputs = [
+      php
+      composer
+    ];
+    text = ''
+      composer validate
+    '';
+  };
+  projectValidateXml = pkgs.writeShellApplication {
+    name = "project-validate-xml";
+    runtimeInputs = [
+      pkgs.libxml2
+      pkgs.wget
+      projectInstall
+    ];
+    text = ''
+      project-install
+      xmllint --schema vendor/phpunit/phpunit/phpunit.xsd --noout phpunit.xml.dist
+      wget --no-check-certificate https://docs.oasis-open.org/xliff/v1.2/os/xliff-core-1.2-strict.xsd --output-document=xliff-core-1.2-strict.xsd
+      # shellcheck disable=SC2046
+      xmllint --schema xliff-core-1.2-strict.xsd --noout $(find Resources -name '*.xlf')
+    '';
+  };
+  projectTest = pkgs.writeShellApplication {
+    name = "project-test";
+    runtimeInputs = [
+      php
+    ];
+    text = ''
+      ./vendor/bin/phpunit --testdox
+    '';
+  };
+  projectCgl = pkgs.writeShellApplication {
+    name = "project-cgl";
+    runtimeInputs = [
+      php
+    ];
+    text = ''
+      ./vendor/bin/ecs check
+    '';
+  };
+  projectCglFix = pkgs.writeShellApplication {
+    name = "project-cgl-fix";
+    runtimeInputs = [
+      php
+    ];
+    text = ''
+      ./vendor/bin/ecs check --fix
+    '';
+  };
+
+in pkgs.mkShell {
+  name = "TYPO3 Extension Watchlist";
+  buildInputs = [
+    projectInstall
+    projectValidateComposer
+    projectValidateXml
+    projectCgl
+    projectCglFix
+    projectTest
+    php
+    composer
+  ];
+
+  shellHook = ''
+    export PROJECT_ROOT="$(pwd)"
+
+    export typo3DatabaseDriver=pdo_sqlite
+  '';
+}