Git pre-commit hook which checks if gofmt fails on any *.go files

pre-commit.gofmt

#!/bin/bash
root=$(git rev-parse --show-cdup)
[ "x$root" = "x" ] && root=.

IFS=$'\n' 
status=0
files=''
# Get a list of staged refs
for object in $(git ls-files -s --full-name $root | sed -e 's/^.* \([a-zA-Z0-9][a-zA-Z0-9]*\)[\t ]*[0-9][0-9]*.\(.*\)$/\1 \2/'); do
    ref=$(echo $object | cut -d' ' -f1)
    file=$(echo $object | cut -d' ' -f2)
    # Only check *.go files
    if [ ! "$(echo $file | sed -e 's/^.*\.\([^.]*\)$/\1/')" = "go" ]; then
        continue
    fi
    formatted="$(git cat-file -p $ref | gofmt -l $GOFMTFLAGS 2> /dev/null)"
    # If parsing fails or formatting is incorrect, fail the commit
    if (($?)) || [ "x$formatted" != "x" ]; then
        files="$files\t$file\n"
        status=1
    fi
done
echo "gofmt failed on the following files:"
echo -n -e "$files"
exit $status