use std::ops::Deref;

/// Kind of error encountered by `ListDirstateTrackedFiles`

pub enum ListDirstateTrackedFilesErrorKind {

    /// Error when reading the `dirstate` file

    IoError(std::io::Error),

    /// Error when parsing the `dirstate` file

/// A `ListDirstateTrackedFiles` error

pub struct ListDirstateTrackedFilesError {

    /// Kind of error encountered by `ListDirstateTrackedFiles`

    pub kind: ListDirstateTrackedFilesErrorKind,

impl std::error::Error for ListDirstateTrackedFilesError {}

impl fmt::Display for ListDirstateTrackedFilesError {

impl From<ListDirstateTrackedFilesErrorKind>

    for ListDirstateTrackedFilesError

{

    fn from(kind: ListDirstateTrackedFilesErrorKind) -> Self {

        ListDirstateTrackedFilesError { kind }

impl From<std::io::Error> for ListDirstateTrackedFilesError {

    fn from(err: std::io::Error) -> Self {

        let kind = ListDirstateTrackedFilesErrorKind::IoError(err);

        ListDirstateTrackedFilesError { kind }

    /// The `dirstate` content.

    pub fn new(root: &PathBuf) -> Result<Self, ListDirstateTrackedFilesError> {

        let dirstate = root.join(".hg/dirstate");

        let content = fs::read(&dirstate)?;

        Ok(Self { content })

    }

    pub fn run(

        &mut self,

    ) -> Result<Vec<&HgPath>, ListDirstateTrackedFilesError> {

            .map_err(ListDirstateTrackedFilesErrorKind::ParseError)?;