Re: [PATCH 1/3] t5730: introduce fetch command helper

Jonathan Nieder [off-list ref] writes:

Here the entirety of the input to "test-tool pkt-line pack" is the
entirety of the output from write_fetch_command, which would suggest
either

 a. making write_fetch_command pipe its output to "test-tool pkt-line
    pack", or

 b. using a pipe instead of a command substitution, like
    "write_fetch_command ... | test-tool pkt-line pack >in"

(although as mentioned above, I think it's simpler to inline the
write_fetch_command and even the write_command as well).

Yeah, write_command was not saving all that much to begin with.  I
was hoping that there were a lot more commonality that we can save
some typing.