diff --git a/maintainers.sh b/maintainers.sh
new file mode 100755
index 0000000..1e4456e
--- /dev/null
+++ b/maintainers.sh
@@ -0,0 +1,146 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p jq -p curl
+
+set -euxo pipefail
+
+statuses_url=$(curl --fail -L "https://api.github.com/repos/nixos/nixpkgs/pulls/$1" \
+                   | jq -r .statuses_url)
+
+changed_url=$(curl --fail -L "$statuses_url" \
+                  | jq -r '.[] | select (.state == "success" and .description == "^.^!" and .target_url != "") | .target_url' | head -n1 \
+                  | sed -e 's#gist.github.com#api.github.com/gists#' \
+       )
+changed_text_url=$(curl --fail -L "$changed_url" \
+        | jq -r '.files."Changed Paths".raw_url')
+
+if [ "x$changed_url" == "x" ]; then
+   echo "Nothing changed"
+   exit 1
+fi
+
+(
+    cat <<EOF
+let
+pkgs = import ./default.nix {};
+
+EOF
+    echo 'changedattrs = ['
+    curl --fail -L "$changed_text_url" \
+        | cut -f2 \
+        | sort | uniq \
+        | sed -e 's/\./" "/g' | sed -e 's/^/[ "/' | sed -e 's/$/" ]/'
+    echo '];
+
+changedpaths = ['
+
+    curl --fail -L "https://github.com/NixOS/nixpkgs/pull/$1.patch" \
+        | grep "^+++ b/"  | sed -e "s/^+++ b//" \
+        | sed -e 's/^/"/' | sed -e 's/$/"/' \
+        | sort | uniq
+
+    echo '];'
+
+    cat <<'EOF'
+
+anyMatchingFile = filename:
+  let
+    matching = builtins.filter
+      (changed: pkgs.lib.strings.hasSuffix changed filename)
+      changedpaths;
+  in (builtins.length matching) > 0;
+
+anyMatchingFiles = files:
+  (builtins.length (builtins.filter anyMatchingFile files)) > 0;
+
+enrichedAttrs = builtins.map
+(path: {
+  path = path;
+  name = "pkgs.${builtins.concatStringsSep "." path}";
+})
+changedattrs;
+
+validPackageAttributes = builtins.filter
+  (pkg:
+  if (pkgs.lib.attrsets.hasAttrByPath pkg.path pkgs) then
+  (if (builtins.tryEval (pkgs.lib.attrsets.attrByPath pkg.path null pkgs)).success
+  then true
+  else builtins.trace "Failed to access ${pkg.name} even though it exists" false)
+  else builtins.trace "Failed to locate ${pkg.name}." false
+  )
+  enrichedAttrs;
+
+attrsWithPackages = builtins.map
+  (pkg: pkg // { package = pkgs.lib.attrsets.attrByPath pkg.path null pkgs; })
+  validPackageAttributes;
+
+attrsWithMaintainers = builtins.map
+  (pkg: pkg // { maintainers = (pkg.package.meta or {}).maintainers or []; })
+  attrsWithPackages;
+
+attrsWeCanPing = builtins.filter
+  (pkg: if (builtins.length pkg.maintainers) > 0
+        then true
+        else builtins.trace "Package has no maintainers: ${pkg.name}" false
+  )
+  attrsWithMaintainers;
+
+relevantFilenames = drv:
+  (pkgs.lib.lists.unique
+    (builtins.map
+      (pos: pos.file)
+      (builtins.filter (x: x != null)
+        [
+          (builtins.unsafeGetAttrPos "maintainers" (drv.meta or {}))
+          (builtins.unsafeGetAttrPos "src" drv)
+          # broken because name is always set in stdenv:
+          #    # A hack to make `nix-env -qa` and `nix search` ignore broken packages.
+          #    # TODO(@oxij): remove this assert when something like NixOS/nix#1771 gets merged into nix.
+          #    name = assert validity.handled; name + lib.optionalString
+          #(builtins.unsafeGetAttrPos "name" drv)
+          (builtins.unsafeGetAttrPos "pname" drv)
+          (builtins.unsafeGetAttrPos "version" drv)
+        ]
+        )));
+
+attrsWithFilenames = builtins.map
+  (pkg: pkg // { filenames = relevantFilenames pkg.package; })
+  attrsWithMaintainers;
+
+attrsWithModifiedFiles = builtins.filter
+  (pkg: anyMatchingFiles pkg.filenames)
+  attrsWithFilenames;
+
+listToPing = pkgs.lib.lists.flatten
+(builtins.map
+(pkg:
+  builtins.map
+  (maintainer: {
+    handle = maintainer.github;
+    packageName = pkg.name;
+    dueToFiles = pkg.filenames;
+  })
+  pkg.maintainers
+)
+attrsWithModifiedFiles);
+
+byMaintainer = pkgs.lib.lists.foldr
+  (ping: collector: collector // { "${ping.handle}" = [ { inherit (ping) packageName dueToFiles; } ] ++ (collector."${ping.handle}" or []); })
+  {}
+  listToPing;
+
+textForPackages = packages:
+pkgs.lib.strings.concatStringsSep ", " (
+builtins.map
+(pkg: pkg.packageName)
+packages);
+
+textPerMaintainer = pkgs.lib.attrsets.mapAttrs
+(maintainer: packages: "- @${maintainer} for ${textForPackages packages}")
+byMaintainer;
+
+text = pkgs.lib.strings.concatStringsSep "\n" (builtins.attrValues textPerMaintainer);
+in builtins.trace text ""
+EOF
+) > data.nix
+
+nix-instantiate --eval ./data.nix