Opens all files modified since specified revision of a git repo in vim and Gdiff them

vim git head

#!/bin/bash

# You'll need to get vim-fugitive:
#    https://github.com/tpope/vim-fugitive

if [ $# -eq 0 ]
then
    since='HEAD^'
    show_diff=false
else
    since=$1
    show_diff=true
fi

git_cmd="git diff-tree --no-commit-id --name-only -r $since..HEAD"
gdiff="'+tabdo Gdiff $since' +tabfirst"
vim_cmd="vim -p `$git_cmd`"

if [ $show_diff == true ]
then
    vim_cmd="$vim_cmd $gdiff"
fi

eval $vim_cmd