Re: [PATCH v4 0/3] Add cat-file --batch-command flag

> The feature proposal of adding a command interface to cat-file was first
> discussed in [A]. In [B], Taylor expressed the need for a fuller proposal
> before moving forward with a new flag. An RFC was created [C] and the idea
> was discussed more thoroughly, and overall it seemed like it was headed in
> the right direction.
>
> This patch series consolidates the feedback from these different threads.
>
> This patch series has three parts:
>
>  1. preparation patch to rename a variable
>  2. adding an enum to keep track of batch modes
>  3. logic to handle --batch-command flag, adding contents, info, flush
>     commands
>
> Changes since v3 (thanks to Junio's feedback):
>
>  * added cascading logic in batch_options_callback()
>  * free memory for queued call input lines
>  * do not throw error when flushing an empty queue
>  * renamed cmds array to singular queued_cmd
>  * fixed flaky test that failed --stress