use crate::{worktree, Worktree}; /// Worktree iterationimpl crate::Repository {    /// Return a list of all _linked_ worktrees sorted by private git dir path as a lightweight proxy.    ///    /// Note that these need additional processing to become usable, but provide a first glimpse a typical worktree information.    pub fn worktrees(&self) -> std::io::Result<Vec<worktree::Proxy<'_>>> {        let mut res = Vec::new();        let iter = match std::fs::read_dir(self.common_dir().join("worktrees")) {            Ok(iter) => iter,            Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(res),            Err(err) => return Err(err),        };        for entry in iter {            let entry = entry?;            let worktree_git_dir = entry.path();            if worktree_git_dir.join("gitdir").is_file() {                res.push(worktree::Proxy {                    parent: self,                    git_dir: worktree_git_dir,                })            }        }        res.sort_by(|a, b| a.git_dir.cmp(&b.git_dir));        Ok(res)    }     /// Iterate all _linked_ worktrees in sort order and resolve them, ignoring those without an accessible work tree, into repositories    /// whose [`worktree()`][crate::Repository::worktree()] is the worktree currently being iterated.    ///    /// Note that for convenience all io errors are squelched so if there is a chance for IO errors during    /// traversal of an owned directory, better use `list()` directly. The latter allows to resolve repositories    /// even if the worktree checkout isn't accessible.    pub fn worktree_repos(&self) -> ! {        todo!()    }} /// Interact with individual worktrees and their information.impl crate::Repository {    /// Return the repository owning the main worktree.    ///    /// Note that it might be the one that is currently open if this repository dosn't point to a linked worktree.    /// Also note that the main repo might be bare.    pub fn main_repo(&self) -> Result<crate::Repository, crate::open::Error> {        crate::ThreadSafeRepository::open_opts(self.common_dir(), self.options.clone()).map(Into::into)    }     /// Return the currently set worktree if there is one, acting as platform providing a validated worktree base path.    ///    /// Note that there would be `None` if this repository is `bare` and the parent [`Repository`][crate::Repository] was instantiated without    /// registered worktree in the current working dir.    pub fn worktree(&self) -> Option<Worktree<'_>> {        self.work_dir().map(|path| Worktree { parent: self, path })    }     /// Return true if this repository is bare, and has no main work tree.    ///    /// This is not to be confused with the [`worktree()`][crate::Repository::worktree()] worktree, which may exists if this instance    /// was opened in a worktree that was created separately.    pub fn is_bare(&self) -> bool {        self.config.is_bare    }     /// Open a new copy of the index file and decode it entirely.    ///    /// It will use the `index.threads` configuration key to learn how many threads to use.    /// Note that it may fail if there is no index.    // TODO: test    #[cfg(feature = "git-index")]    pub fn open_index(&self) -> Result<git_index::File, worktree::open_index::Error> {        use std::convert::{TryFrom, TryInto};        let thread_limit = self            .config            .resolved            .boolean("index", None, "threads")            .map(|res| {                res.map(|value| if value { 0usize } else { 1 }).or_else(|err| {                    git_config::Integer::try_from(err.input.as_ref())                        .map_err(|err| worktree::open_index::Error::ConfigIndexThreads {                            value: err.input.clone(),                            err,                        })                        .map(|value| value.to_decimal().and_then(|v| v.try_into().ok()).unwrap_or(1))                })            })            .transpose()?;        git_index::File::at(            self.git_dir().join("index"),            git_index::decode::Options {                object_hash: self.object_hash(),                thread_limit,                min_extension_block_in_bytes_for_threading: 0,            },        )        .map_err(Into::into)    }}