#!/usr/bin/env zsh
# Copied from https://github.com/paulirish/dotfiles/commit/6743b907ff586c28cd36e08d1e1c634e2968893e

function strip_diff_leading_symbols(){
    color_code_regex=$'(\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K])'

    # simplify the unified patch diff header
    sed -E "s/^($color_code_regex)diff --git .*$//g" | \
        sed -E "s/^($color_code_regex)index .*$/\
\1$(rule)/g" | \
        sed -E "s/^($color_code_regex)\+\+\+(.*)$/\1\+\+\+\5\\
\1$(rule)/g" | \

    # actually strips the leading symbols
    sed -E "s/^($color_code_regex)[\+\-]/\1 /g"
}

## Print a horizontal rule
rule () {
    printf "%$(tput cols)s\n"|tr " " "─"
}

/usr/local/share/git-core/contrib/diff-highlight/diff-highlight | strip_diff_leading_symbols