Generate Git commit log within a range #Git #Shell #versioning #devops

git_log_range.sh

git_log_range() {
    """
    Print full multiline Git commit messages between two revisions.

    Args:
        $1 (string): Start revision (exclusive). Example: v1.2.0
        $2 (string): End revision (inclusive). Example: HEAD
                      Defaults to HEAD if not provided.

    Behavior:
        - Outputs commits reachable from <end> but not from <start>
        - Preserves full multiline commit messages (subject + body)
        - Prints commits in chronological order (oldest → newest)
        - Separates commits with a clear delimiter line "----"

    Example:
        git_log_range v1.2.0 HEAD
        git_log_range v1.2.0
    """
    
    local start="$1"
    local end="${2:-HEAD}"

    if [ -z "$start" ]; then
        echo "Error: start revision required (e.g., v1.2.0)"
        return 1
    fi

    git log "${start}..${end}" \
        --reverse \
        --pretty=format:"----%n%B"
}