use crate::Oid;use anyhow::{anyhow, Result};use collections::HashMap;use std::path::Path;use std::process::Command; pub fn get_messages(working_directory: &Path, shas: &[Oid]) -> Result<HashMap<Oid, String>> {    const MARKER: &'static str = "<MARKER>";     let output = Command::new("git")        .current_dir(working_directory)        .arg("show")        .arg("-s")        .arg(format!("--format=%B{}", MARKER))        .args(shas.iter().map(ToString::to_string))        .output()        .map_err(|e| anyhow!("Failed to start git blame process: {}", e))?;     anyhow::ensure!(        output.status.success(),        "'git show' failed with error {:?}",        output.status    );     Ok(shas        .iter()        .cloned()        .zip(            String::from_utf8_lossy(&output.stdout)                .trim()                .split_terminator(MARKER)                .map(|str| String::from(str.trim())),        )        .collect::<HashMap<Oid, String>>())}