packages/nix-which: init

nix/packages/by-name/nix-which/package.nix

@@ -0,0 +1,27 @@
+{
+  writeShellApplication,
+  which,
+  lib,
+}: let
+  # Use this to not pollute the PATH inside
+  # Otherwise nix-which which will be an edge case
+  whichExe = "${lib.getExe which}";
+in
+  writeShellApplication {
+    name = "nix-which";
+    text = ''
+      if [ "$#" -ne 1 ]; then
+          echo "Must provide exactly one argument, the package to be dereferenced"
+          exit 1
+      fi
+      target="$1"
+
+      target="$(${whichExe} "$target")"
+      echo "==> $target"
+
+      while [ -L "$target" ]; do
+          target="$(readlink "$target")"
+          echo "==> $target"
+      done
+    '';
+  }