update flake

fish/conf.d/functions.fish

@@ -76,3 +76,46 @@ function gur
   git reset "HEAD@{$argv[1]}"
 end
 
+function nix_upgrade
+    sudo nix flake update --flake /home/catalin/.dotfiles/nix/
+    sudo nixos-rebuild switch --flake /home/catalin/.dotfiles/nix/ --upgrade
+end
+
+function delete_line
+    if test (count $argv) -lt 2
+        echo "Usage: delete_line <file> <line_number> [--backup]"
+        return 1
+    end
+
+    set file $argv[1]
+    set line_num $argv[2]
+    set make_backup false
+
+    if contains -- --backup $argv
+        set make_backup true
+    end
+
+    if not test -f $file
+        echo "Error: File '$file' does not exist"
+        return 1
+    end
+
+    if not string match -qr '^\d+$' $line_num
+        echo "Error: Line number must be a positive integer"
+        return 1
+    end
+
+    set total_lines (wc -l < $file)
+    if test $line_num -gt $total_lines
+        echo "Error: Line $line_num does not exist (file has only $total_lines lines)"
+        return 1
+    end
+
+    if test $make_backup = true
+        cp $file $file.bak
+        echo "Backup created: $file.bak"
+    end
+
+    sed -i "$line_num"d $file
+    echo "Deleted line $line_num from $file"
+end