$ hg init repo

  $ cd repo

  $ i=0; while [ "$i" -lt 213 ]; do echo a >> a; i=`expr $i + 1`; done

  $ hg add a

Wide diffstat:

  $ hg diff --stat

   a |  213 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

   1 files changed, 213 insertions(+), 0 deletions(-)

diffstat width:

  $ COLUMNS=24 hg diff --config ui.interactive=true --stat

   a |  213 ++++++++++++++

   1 files changed, 213 insertions(+), 0 deletions(-)

  $ hg ci -m adda

  $ cat >> a <<EOF

  > a

  > a

  > a

  > EOF

Narrow diffstat:

  $ hg diff --stat

   a |  3 +++

   1 files changed, 3 insertions(+), 0 deletions(-)

  $ hg ci -m appenda

  $ printf '\0' > b

  $ hg add b

Binary diffstat:

  $ hg diff --stat

   b |    0 

   1 files changed, 0 insertions(+), 0 deletions(-)

Binary git diffstat:

  $ hg diff --stat --git

   b |  Bin 

   1 files changed, 0 insertions(+), 0 deletions(-)

  $ hg ci -m createb

  $ printf '\0' > "file with spaces"

  $ hg add "file with spaces"

Filename with spaces diffstat:

  $ hg diff --stat

   file with spaces |    0 

   1 files changed, 0 insertions(+), 0 deletions(-)

Filename with spaces git diffstat:

  $ hg diff --stat --git

   file with spaces |  Bin 

   1 files changed, 0 insertions(+), 0 deletions(-)