Simple git find-&-replace utility (for use w/ GNU sed)

git-find-replace.sh

#--------------------------------------------------------
# Simple search and replace utility for git repositories.
# @note Use w/ GNU sed.
# (c) Nathan Nobbe 2014
# quickshiftin@gmail.com
# http://quickshiftin.com
# $1 - Search
# $2 - Replace
# $3 - Subdirectory (optional, defaults to cwd)
#--------------------------------------------------------
function git_find_replace
{
    local grepexp="$1"
    local replace="$2"
    local dir='.'
    if [ ! -z "$3" ]; then
        dir="$3"
    fi  

    # Build sed command
    local sedcmd="s/$grepexp/$replace/g"

    # First find the files; then pipe through xargs sed for replacement
    echo git grep --name-only "$grepexp" "$dir" '| xargs sed -i -r' "$sedcmd"
    git grep --name-only "$grepexp" "$dir" | xargs sed -r "$sedcmd" -i
}

To use this w/ BSD sed, simply change the -i component to -i ''. You must explicitly supply an empty string to the -i flag under BSD sed.