#!/bin/bash

set -eo pipefail

UPSTREAM=$1
HEAD=$2

HASHES=$(git cherry "$UPSTREAM" "$HEAD" | grep -F '+' | tr -d '+ ' | cut -c 1-7)
HASH_REGEX="/$(echo "$HASHES" | paste -sd '|' -)/"

AWK_PROG_TEMPLATE="$HASH_REGEX {
    where = match(\$0, /[a-f0-9]{7,}/)
    substring = substr(\$0, where, 7)
    sub(substring, \"\033[1;7m&\")
}

{ print }
"

git log --all --decorate --oneline --graph --color=always | awk "$AWK_PROG_TEMPLATE" | less -R