Add ptest to run and watch PHP tests

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

modules/scripts/onchange.nix

@@ -1,12 +1,17 @@
-{
-  flake.modules.homeManager.base =
-    { pkgs, ... }:
-    {
-      home.packages = [
-        (pkgs.writeShellApplication {
-          name = "onchange";
+{ withSystem, ... }:
 
-          runtimeInputs = with pkgs; [
+let
+  name = "onchange";
+in
+{
+  perSystem =
+    { pkgs, ... }:
+    with pkgs;
+    {
+      packages.${name} = writeShellApplication {
+        inherit name;
+
+        runtimeInputs = [
           coreutils
           entr
         ];
@@ -17,7 +22,14 @@
 
           find . -path "$PATTERN" -type f | entr -cs "$@"
         '';
-        })
+      };
+    };
+
+  flake.modules.homeManager.base =
+    { pkgs, ... }:
+    {
+      home.packages = [
+        (withSystem pkgs.system (psArgs: psArgs.config.packages.${name}))
       ];
     };
 }

modules/scripts/ptest.nix

@@ -0,0 +1,42 @@
+{ withSystem, ... }:
+
+let
+  name = "ptest";
+in
+{
+  perSystem =
+    psArgs@{ pkgs, ... }:
+    with pkgs;
+    {
+      packages.${name} = writeShellApplication {
+        inherit name;
+
+        runtimeInputs = [
+          psArgs.config.packages.onchange
+        ];
+
+        text = ''
+          command="phpunit"
+          args=("--colors")
+
+          bin="vendor/bin"
+
+          if [[ -x "$bin/pest" ]]; then
+            command="pest"
+            args=()
+          fi
+
+          onchange "**/*.php" \
+            "$bin/$command ''${args[*]} $*"
+        '';
+      };
+    };
+
+  flake.modules.homeManager.base =
+    { pkgs, ... }:
+    {
+      home.packages = [
+        (withSystem pkgs.system (psArgs: psArgs.config.packages.${name}))
+      ];
+    };
+}