Git log format string

git log --pretty="format: ..."

%H  - commit hash
%h  - commit hash, abbrew
%T  - tree hash
%T  - tree hash, abbrev
%P  - parent hash
%p  - parent hash, abbrew
%an - author
%aN - author, respecting mailmap
%ae - author email
%aE - author email, respending mailmap
%aD - date (rfc2882)
%ar - date (relative)
%at - date (unix timestamp)
%ai - date (iso8601)
%cn - committer name
%cN - committer name
%ce - committer email
%cE - committer email
%cd - committer date
%cD - committer date
%cr
%ct
%ci
%cd - ref names
%e  - econding
%s  - commit subject
%f  - commit subject, filename style
%b  - commit body