gps 7.3.3

Official CLI & library for Git Patch Stack
Documentation 
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use super::super::super::ps;
use super::super::private::utils;
use std::result::Result;

#[derive(Debug)]
pub enum CheckoutError {
    GetPatchStackFailed(ps::PatchStackError),
    GetPatchListFailed(ps::GetPatchListError),
    PatchIndexNotFound,
    FailedToCheckout(utils::ExecuteError),
}

pub fn checkout(repo: &git2::Repository, patch_index: usize) -> Result<(), CheckoutError> {
    // get the sha of the commit referenced by the patch index
    let patch_stack = ps::get_patch_stack(repo).map_err(CheckoutError::GetPatchStackFailed)?;
    let patches_vec =
        ps::get_patch_list(repo, &patch_stack).map_err(CheckoutError::GetPatchListFailed)?;
    let patch_oid = patches_vec
        .get(patch_index)
        .ok_or(CheckoutError::PatchIndexNotFound)?
        .oid;

    utils::execute("git", &["checkout", format!("{}", patch_oid).as_str()])
        .map_err(CheckoutError::FailedToCheckout)?;

    Ok(())
}