Show git changelogs between branches

show-me-git-changelogs.sh

# To use it:
# show_me_git_change_logs release-v2.38.0
# show_me_git_change_logs release-v2.38.0 another_branch
function show_me_git_change_logs() {
    fromBranch=${1}
    toBranch=${2:-master}
    echo "Here are the changelogs for origin/${fromBranch}...origin/${toBranch}\n"
    # Sort and add bullet for each item as well
    git log --oneline --no-merges --pretty=format:%s origin/${fromBranch}...origin/${toBranch} | sort | sed 's/^/- /'
}

# Show the diff between branches as commits (1 line style)
# also compare the diff commits with last 100 commits of target branch to see if some of them were merged as cherry-pick
function show_me_git_change_logs() {
    fromBranch=${1}
    toBranch=${2:-master}
    echo "\nChangelogs for ${fromBranch}...${toBranch}:\n"
    changelogs=$(git log --oneline --no-merges --pretty=format:%s ${fromBranch}...${toBranch} | sort | while read -r commit; do
        if git log -n 100 --pretty=format:%s ${toBranch} | grep -q "$commit"; then
            echo "- $commit (prev)"
        else
            echo "- $commit"
        fi
    done | sort -r | uniq)

    prev_commits=$(echo "$changelogs" | grep "(prev)")
    new_commits=$(echo "$changelogs" | grep -v "(prev)")

    echo "=== Merged commits (probably, as it matched to the commit on the target branch) ==="
    echo "$prev_commits"
    echo "\n=== New commits ==="
    echo "$new_commits"
}