A better git-checkout

git-co.sh

#!/bin/bash
#####
# Fix the ridiculous ambiguity between branches and files in git-checkout.
# The new default behavior is to check out branches only.
# To check out a file, you must precede the filename with "--".
#####

found=false
for arg in "$@"; do
  if [[ $arg == "--" ]]; then
    found=true
    break
  fi
done

if ! $found; then
  # Add "--" to the end (the first "--" is for the set command itself)
  set -- "$@" --
fi

exec git checkout "$@"