#!/bin/bash
set -x 
commit_before_pull=""

save_commit_before_pull () {
    commit_before_pull=$(git reflog | grep "HEAD@{0}" | cut -d" " -f1)
    if ! [ -z "$commit_before_pull" ]; then
        if grep -qE "^[[:xdigit:]]{6,}$" <<< $commit_before_pull; then
            return 0
        fi
    fi
    commit_before_pull=""
    return 1
}
# save_commit_before_pull

revert_to_commit_before_pull () {
    if ! [ -z "$commit_before_pull" ]; then
        if grep -qE "^[[:xdigit:]]{6,}$" <<< $commit_before_pull; then
            `git reset --hard "$commit_before_pull"`
            if [ $? -eq 0 ]; then
                return 0
            fi
        fi
    fi
    return 1
}
# revert_to_commit_before_pull