Git bash aliases with tab completion

gistfile1.sh

#!/bin/sh

# Git related aliases

parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}

__define_git_completion () {
eval "
    _git_$2_shortcut () {
        COMP_LINE=\"git $2\${COMP_LINE#$1}\"
        let COMP_POINT+=$((4+${#2}-${#1}))
        COMP_WORDS=(git $2 \"\${COMP_WORDS[@]:1}\")
        let COMP_CWORD+=1

        # Latest bash complete is choking on this...
        #_get_comp_words_by_ref -n =: cur words cword prev
        local cur words cword prev
        _git_$2
    }
"
}

__git_shortcut () {
    type _git_$2_shortcut &>/dev/null || __define_git_completion $1 $2
    alias $1="git $2 $3"
    complete -o default -o nospace -F _git_$2_shortcut $1
}

__git_shortcut  a    add
__git_shortcut  b    branch
__git_shortcut  ba   branch -a
__git_shortcut  co   checkout
__git_shortcut  c    commit
__git_shortcut  ci   commit -a
__git_shortcut  d    diff
__git_shortcut  dc   diff --cached
__git_shortcut  ds   diff --stat
__git_shortcut  f    fetch
__git_shortcut  up   push origin

# Custom logging
__git_shortcut  l    prettylog
__git_shortcut  g    prettygraph

alias s='git status' # no completion for git status
alias ff='git ff' # no completion for fast-forward