my actual .gitconfig

.gitconfig

[gui]

[diff]
  tool = vim
[difftool "vim"]
  cmd = "vimdiff \"$LOCAL\" \"$REMOTE\""

[merge]

[guitool "Files/Open"]
  cmd = mvim $FILENAME
  noconsole = yes

[user]
  name = yann ARMAND
  email = yarmand@yammer-inc.com

[merge]
  diffstat = false

[core]
  excludesfile = /Users/yarmand/.gitignore_global

[difftool "sourcetree"]
        cmd = opendiff \"$LOCAL\" \"$REMOTE\"
        path =

[mergetool "sourcetree"]
        cmd = /Applications/SourceTree.app/Contents/Resources/opendiff-w.sh \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
        trustExitCode = true

[alias]
  latest = "! sh -c 'git fetch; git checkout -b temp ; git branch -D $1 ; git checkout $1 ; git branch -D temp' -"
  co = "checkout"
  ll = log --graph --max-count=20 --pretty=format:'%C(yellow)%h%Creset -%C(red)%d%Creset %s %C(green)(%an, %cr)%Creset'
  l = log --graph --pretty=format:'%C(yellow)%H%Creset -%C(red)%d%Creset %s %C(green)(%an, %cr)%Creset %C(red)%N%Creset'
  s = status --branch --short --untracked=no
  ss = status

[color]
  ui = auto