phpPackages.psalm: Move to separate directory

pkgs/development/php-packages/psalm/default.nix

@@ -0,0 +1,30 @@
+{ mkDerivation, fetchurl, pkgs, lib, php }:
+let
+  pname = "psalm";
+  version = "3.11.2";
+in
+mkDerivation {
+  inherit pname version;
+
+  src = fetchurl {
+    url = "https://github.com/vimeo/psalm/releases/download/${version}/psalm.phar";
+    sha256 = "1ani0907whqy2ycr01sjlvrmwps4dg5igim8z1qyv8grhwvw6gb0";
+  };
+
+  phases = [ "installPhase" ];
+  nativeBuildInputs = [ pkgs.makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install -D $src $out/libexec/psalm/psalm.phar
+    makeWrapper ${php}/bin/php $out/bin/psalm \
+      --add-flags "$out/libexec/psalm/psalm.phar"
+  '';
+
+  meta = with pkgs.lib; {
+    description = "A static analysis tool for finding errors in PHP applications";
+    license = licenses.mit;
+    homepage = "https://github.com/vimeo/psalm";
+    maintainers = teams.php.members;
+  };
+}

pkgs/top-level/php-packages.nix

@@ -51,32 +51,7 @@ in
 
     phpstan = callPackage ../development/php-packages/phpstan { };
 
-    psalm = mkDerivation rec {
+    psalm = callPackage ../development/php-packages/psalm { };
-      version = "3.11.2";
-      pname = "psalm";
-
-      src = pkgs.fetchurl {
-        url = "https://github.com/vimeo/psalm/releases/download/${version}/psalm.phar";
-        sha256 = "1ani0907whqy2ycr01sjlvrmwps4dg5igim8z1qyv8grhwvw6gb0";
-      };
-
-      phases = [ "installPhase" ];
-      nativeBuildInputs = [ pkgs.makeWrapper ];
-
-      installPhase = ''
-        mkdir -p $out/bin
-        install -D $src $out/libexec/psalm/psalm.phar
-        makeWrapper ${php}/bin/php $out/bin/psalm \
-          --add-flags "$out/libexec/psalm/psalm.phar"
-      '';
-
-      meta = with pkgs.lib; {
-        description = "A static analysis tool for finding errors in PHP applications";
-        license = licenses.mit;
-        homepage = "https://github.com/vimeo/psalm";
-        maintainers = teams.php.members;
-      };
-    };
 
     psysh = mkDerivation rec {
       version = "0.10.3";