repo: diff: add option to show "creation event" diff for root commit

At its inception, Git did not show a "creation event" diff for a
project's root commit since early projects, such as the Linux kernel,
were already well established, and a large root diff was considered
uninteresting noise.

On the other hand, new projects adopting Git typically have small root
commits, and such a "creation event" is likely to have meaning, rather
than being pure noise. Consequently, git-diff-tree gained a --root flag
in dc26bd89 (diff-tree: add "--root" flag to show a root commit as a big
creation event, 2005-05-19), though it was disabled by default.

Displaying the root "creation event" diff, however, became the default
behavior when configuration option 'log.showroot' was added to git-log
in 0f03ca94 (config option log.showroot to show the diff of root
commits; 2006-11-23). And, gitk (belatedly) followed suit when it
learned to respect 'log.showroot' in b2b76d10 (gitk: Teach gitk to
respect log.showroot; 2011-10-04).

By default, these tools now all show the root diff as a "creation
event", however, git-arr suppresses it unconditionally. Resolve this
shortcoming by adding a new git-arr configuration option "rootdiff" to
control the behavior (enabled by default).

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Alberto Bertogli <albertito@blitiri.com.ar>

0 files changed, 0 insertions, 0 deletions