How to combine stdin into a pipe?

Question

I want to send pipe and stdin output to a channel in bash.

Ie:

gen_input | cat - | parse_input_and_stdin 

will send the output of gen_input to parse_input_and_stdin , and then leave stdin open for more interactive input.

Answer 1

 cat <(gen_input) - | parse_input_and_stdin 

Answer 2

To close.

 { gen_input ; cat ; } | parse_input_and_stdin