some fixes

configs/alias_useful.fish

@@ -100,6 +100,34 @@ function mkvenv
     end
 end
 
+function src
+    # Check if venv directory exists
+    if not test -d .venv
+        echo "Cannot activate: .venv directory does not exist."
+        return 1
+    end
+
+    if not test -d .venv/bin
+        echo "Cannot activate: .venv/bin directory does not exist."
+        return 1
+    end
+
+    # Prefer Fish activation script
+    if test -f .venv/bin/activate.fish
+        source .venv/bin/activate.fish
+        return 0
+    end
+
+    # Fallback to bash activation via bass
+    if test -f .venv/bin/activate.bash
+        bass source .venv/bin/activate.bash
+        return 0
+    end
+
+    echo "No usable activation script found in .venv/bin/"
+    return 1
+end
+
 # Check if eza exists in either location
 if test -x /usr/bin/eza -o -x $HOME/.cargo/bin/eza
     function ls