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Make it so that you can define an amount of context (in lines) to display before and after every matched line. You could say for example -a 5 and have 5 lines before and 5 lines after every match with TODO show up for context.

If stdout is disconnected because a piped program exits or something, this program has an unhandled exception. Handle it.

We forgot that regex lib can have errors as well. Log those to the console so you can debug your regex when using grep.

add flag that you can set, which will output all lines, not just the target ones, but still only highlight the hits, so you can have context when reading where you got the hits.

You've added the -a flag and the --context flag and still have no documentation in the help text, definitely add that.

Pressing Ctrl + C will send SIGINT to program in linux, which gets triggered fine, but the program doesn't exit until you press enter to send the current line to the program. Fix this.