When the -n/--number flag is passed on the command line, bat now shows
line numbers even when piping output to another process (loop-through
mode), similar to how `cat -n` behaves.
This change detects if -n or --number was passed on the CLI (before
merging with config file and environment variables) and disables
loop-through mode in that case, allowing the InteractivePrinter to
add line numbers.
The existing behavior is preserved:
- Styles from config/env are still ignored when piping (unless --decorations=always is set)
- Only the -n flag from CLI enables line numbers in piped mode
- -p and --style options from CLI do not disable loop-through mode
Keith Hall
abc7261488