From 9e2f0a4676cc0f12e910509e2e1b0b4fff23fb17 Mon Sep 17 00:00:00 2001
From: Daniel Kempkens <daniel+git@kempkens.io>
Date: Fri, 12 Aug 2022 11:51:38 +0200
Subject: [PATCH] Styx: Improve macOS application copying

---
 home/hosts/Styx.nix | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/home/hosts/Styx.nix b/home/hosts/Styx.nix
index 214e73f..4dab261 100644
--- a/home/hosts/Styx.nix
+++ b/home/hosts/Styx.nix
@@ -62,6 +62,7 @@ in
       tokei
       viddy
       wget
+      xxHash
       xz
     ];
   };
@@ -81,15 +82,27 @@ in
     in
     lib.hm.dag.entryAfter [ "writeBoundary" ] ''
       baseDir="$HOME/Applications/Home Manager Apps"
-      if [ -d "$baseDir" ]; then
-        rm -f "''${baseDir}/.DS_Store"
-        rm -rf "$baseDir"
-      fi
-      mkdir -p "$baseDir"
+      $DRY_RUN_CMD mkdir -p "$baseDir"
+
       for appFile in ${apps}/Applications/*; do
+        appFileChecksum="$(find "$appFile/Contents/MacOS" -type f -exec md5 -q {} \; | md5 -q)"
         target="$baseDir/$(basename "$appFile")"
-        $DRY_RUN_CMD cp ''${VERBOSE_ARG:+-v} -fHRL "$appFile" "$baseDir"
-        $DRY_RUN_CMD chmod ''${VERBOSE_ARG:+-v} -R +w "$target"
+
+        if [ -d "$target" ]; then
+          targetChecksum="$(find "$target/Contents/MacOS" -type f -exec md5 -q {} \; | md5 -q)"
+        else 
+          targetChecksum="0"
+        fi
+
+        if [ "$appFileChecksum" = "$targetChecksum" ]; then
+          echo "Application not changed: $(basename "$appFile")"
+        else
+          echo -n "Coyping application $(basename "$appFile"): "
+          $DRY_RUN_CMD rm -rf "$target"
+          $DRY_RUN_CMD cp ''${VERBOSE_ARG:+-v} -fHRL "$appFile" "$baseDir"
+          $DRY_RUN_CMD chmod ''${VERBOSE_ARG:+-v} -R +w "$target"
+          echo 'Done'
+        fi
       done
     '';
 }