Re: [PATCH v10 0/4] Add cat-file --batch-command flag

"John Cai via GitGitGadget" [off-list ref] writes:

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 four parts:

 1. preparation patch to rename a variable
 2. adding an enum to keep track of batch modes
 3. add a remove_timestamp() helper that takes stdin and removes timestamps
 4. logic to handle --batch-command flag, adding contents, info, flush
    commands

Changes since v9

 * add test to exercise format for batch-command
 * minor semantic improvements
 * removed README entry for environment variable used in test

Both the changes relative to the previous round and relative to
'master' look good to me.

Thanks.