use bstr::{BString, ByteSlice, ByteVec};use git_object::Commit; use crate::commit; /// Generate a message typical for git commit logs based on the given `operation`pub fn message(operation: &str, commit: &Commit) -> BString {    let mut out = BString::from(operation);    if let Some(commit_type) = commit_type_by_parents(commit.parents.len()) {        out.push_str(b" (");        out.extend_from_slice(commit_type.as_bytes());        out.push_byte(b')');    }    out.push_str(b": ");    out.extend_from_slice(&commit::summary(commit.message.as_bstr()));    out} pub(crate) fn commit_type_by_parents(count: usize) -> Option<&'static str> {    Some(match count {        0 => "initial",        1 => return None,        _two_or_more => "merge",    })}