add helperfunction to crop slides

modules/home/zsh/default.nix

@@ -60,6 +60,7 @@ in
           cat = "bat --theme=\"$(defaults read -globalDomain AppleInterfaceStyle &> /dev/null && echo 'gruvbox-dark' || echo 'gruvbox-light')\"";
           diff = "delta";
         };
+        profileExtra = builtins.readFile ./functions.zsh;
       };
       fzf = {
         enable = true;
@@ -84,6 +85,10 @@ in
           python.disabled = true;
         };
       };
+      nix-your-shell = {
+        enable = true;
+        enableZshIntegration = true;
+      };
     };
   };
 

modules/home/zsh/functions.zsh

@@ -0,0 +1,16 @@
+# helper function to crop cs3223 slides
+crop_slides() {
+  input="$1"
+  if [ -z "$input" ]; then
+    echo "Usage: crop_slides <inputfile>"
+    return 1
+  fi
+
+  # Get base name (without extension)
+  base="${input%.*}"
+  output="${base}-slides.mp4"
+
+  # Crop left 2/3 of a 1280x640 video (≈853 px wide)
+  nix run "nixpkgs#ffmpeg" -- -i "$input" -filter:v "crop=853:640:0:0" -c:a copy "$output"
+}
+