// list_tracked_files.rs

//

// Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

use crate::errors::HgError;

use crate::matchers::Matcher;

use crate::repo::Repo;

use crate::revlog::manifest::Manifest;

use crate::revlog::RevlogError;

use crate::utils::filter_map_results;

use crate::utils::hg_path::HgPath;

/// List files under Mercurial control at a given revision.

pub fn list_rev_tracked_files(

    repo: &Repo,

    revset: &str,

    narrow_matcher: Box<dyn Matcher>,

) -> Result<FilesForRev, RevlogError> {

    let rev = crate::revset::resolve_single(revset, repo)?;

    Ok(FilesForRev {

        narrow_matcher,

    })

}

pub struct FilesForRev {

    manifest: Manifest,

    narrow_matcher: Box<dyn Matcher>,

}

impl FilesForRev {

    pub fn iter(&self) -> impl Iterator<Item = Result<&HgPath, HgError>> {

        filter_map_results(self.manifest.iter(), |entry| {

            let path = entry.path;

            Ok(if self.narrow_matcher.matches(path) {

                Some(path)

            } else {

                None

            })

        })

    }

}