now with saner listing as well as not requiring git directory to just list.

git-ignore

#!/bin/sh

USAGE="list | list-single | <types> ..."
LONG_USAGE="Generate/Append the repo's .gitignore file using the gitignore.io api

`curl -s http://gitignore.io/api/`"

SUBDIRECTORY_OK=
NONGIT_OK=1
OPTIONS_SPEC=
. "$(git --exec-path)/git-sh-setup"

total=$#

if [ $total -eq 0 ]; then
  usage
fi

# If we are only asking for list, print it.
if [[ $@ == 'list' || $@ == 'list-single' ]]; then
    list=$(curl -s "http://gitignore.io/api/list" | tr -cd '[:print:]\n\t' | tr ',' '\n' | sort)
    if [ $@ == 'list' ]; then
        echo "$list" | column -c $(tput cols)
    else
        echo "$list"
    fi  
    exit 0
fi

# To actually save a gitignore, we have to be in a working tree.
require_work_tree_exists
cd_to_toplevel

for item in $@; do
    # Skip "list"
    if [ $item == 'list' ]; then
        continue;
    fi
done

LIST=$(printf ',%s' "$@" | cut -c 2-)

# tr == prevent shell injection. for safety
curl -s "http://gitignore.io/api/$LIST" | tr -cd '[:print:]\n\t' | tee -a .gitignore