From 9221389b9029a61eebedde615ab5c8b52aec7914 Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Mon, 18 May 2020 11:47:10 -0700
Subject: [PATCH] Only add pinch if not already present

---
 overlays/pinch.nix | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/overlays/pinch.nix b/overlays/pinch.nix
index 1b2c65f..3399609 100644
--- a/overlays/pinch.nix
+++ b/overlays/pinch.nix
@@ -1,9 +1,14 @@
 self: super: {
-  pinch = super.writeShellScriptBin "pinch" ''
-    exec ${self.python3}/bin/python3 ${super.fetchgit {
-      url = "https://scottworley.com/pinch.git";
-      rev = "1.1";
-      sha256 = "0ilbhvr0d83kfwkm7ak64gik44gi2axfnp9rzsa7g5cwz9qaxdbv";
-    }}/pinch.py "$@"
-  '';
+  pinch = if builtins.hasAttr "pinch" super then
+    super.pinch
+  else
+    super.writeShellScriptBin "pinch" ''
+      exec ${self.python3}/bin/python3 ${
+        super.fetchgit {
+          url = "https://scottworley.com/pinch.git";
+          rev = "1.1";
+          sha256 = "0ilbhvr0d83kfwkm7ak64gik44gi2axfnp9rzsa7g5cwz9qaxdbv";
+        }
+      }/pinch.py "$@"
+    '';
 }
-- 
2.44.1