git rm でファイルを削除した時、そのファイルがあったディレクトリが空になるならば、そのディレクトリごと削除される

gistfile1.sh

[10:37] ~/tmp/2014-05-22/test
% git --version
git version 1.9.0

[10:37] ~/tmp/2014-05-22/test
% git init
Initialized empty Git repository in /Users/no-kumagai/tmp/2014-05-22/test/.git/

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% ll

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% mkdir -p path/to/

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% touch path/to/file

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% git add .

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% git ci -m 'first commit'
[master (root-commit) 7a78b7f] first commit
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 path/to/file

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% tree path
path
└── to
    └── file

1 directory, 1 file

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% git rm path/to/file
rm 'path/to/file'

[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% git st
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

        deleted:    path/to/file


[10:37] ~/tmp/2014-05-22/test
 (git)-[master]-% git ci -m 'delete file'
[master 2b96e76] delete file
 1 file changed, 0 insertions(+), 0 deletions(-)
 delete mode 100644 path/to/file

[10:38] ~/tmp/2014-05-22/test
 (git)-[master]-% tree path
path [error opening dir]

0 directories, 0 files

[10:38] ~/tmp/2014-05-22/test
 (git)-[master]-% ll

[10:38] ~/tmp/2014-05-22/test
 (git)-[master]-%