use std::{    fs::{self, OpenOptions},    io::Write,    path::{Path, PathBuf},}; use crate::bstr::ByteSlice; /// The error used in [`into()`].#[derive(Debug, thiserror::Error)]#[allow(missing_docs)]pub enum Error {    #[error("Could not open data at '{}'", .path.display())]    IoOpen { source: std::io::Error, path: PathBuf },    #[error("Could not write data at '{}'", .path.display())]    IoWrite { source: std::io::Error, path: PathBuf },    #[error("Refusing to initialize the existing '{}' directory", .path.display())]    DirectoryExists { path: PathBuf },    #[error("Refusing to initialize the non-empty directory as '{}'", .path.display())]    DirectoryNotEmpty { path: PathBuf },    #[error("Could not create directory at '{}'", .path.display())]    CreateDirectory { source: std::io::Error, path: PathBuf },} const GIT_DIR_NAME: &str = ".git"; const TPL_INFO_EXCLUDE: &[u8] = include_bytes!("../assets/baseline-init/info/exclude");const TPL_HOOKS_APPLYPATCH_MSG: &[u8] = include_bytes!("../assets/baseline-init/hooks/applypatch-msg.sample");const TPL_HOOKS_COMMIT_MSG: &[u8] = include_bytes!("../assets/baseline-init/hooks/commit-msg.sample");const TPL_HOOKS_FSMONITOR_WATCHMAN: &[u8] = include_bytes!("../assets/baseline-init/hooks/fsmonitor-watchman.sample");const TPL_HOOKS_POST_UPDATE: &[u8] = include_bytes!("../assets/baseline-init/hooks/post-update.sample");const TPL_HOOKS_PRE_APPLYPATCH: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-applypatch.sample");const TPL_HOOKS_PRE_COMMIT: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-commit.sample");const TPL_HOOKS_PRE_MERGE_COMMIT: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-merge-commit.sample");const TPL_HOOKS_PRE_PUSH: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-push.sample");const TPL_HOOKS_PRE_REBASE: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-rebase.sample");const TPL_HOOKS_PRE_RECEIVE: &[u8] = include_bytes!("../assets/baseline-init/hooks/pre-receive.sample");const TPL_HOOKS_PREPARE_COMMIT_MSG: &[u8] = include_bytes!("../assets/baseline-init/hooks/prepare-commit-msg.sample");const TPL_HOOKS_UPDATE: &[u8] = include_bytes!("../assets/baseline-init/hooks/update.sample");const TPL_CONFIG: &[u8] = include_bytes!("../assets/baseline-init/config");const TPL_DESCRIPTION: &[u8] = include_bytes!("../assets/baseline-init/description");const TPL_HEAD: &[u8] = include_bytes!("../assets/baseline-init/HEAD"); struct PathCursor<'a>(&'a mut PathBuf); struct NewDir<'a>(&'a mut PathBuf); impl<'a> PathCursor<'a> {    fn at(&mut self, component: &str) -> &Path {        self.0.push(component);        self.0.as_path()    }} impl<'a> NewDir<'a> {    fn at(self, component: &str) -> Result<Self, Error> {        self.0.push(component);        create_dir(self.0)?;        Ok(self)    }    fn as_mut(&mut self) -> &mut PathBuf {        self.0    }} impl<'a> Drop for NewDir<'a> {    fn drop(&mut self) {        self.0.pop();    }} impl<'a> Drop for PathCursor<'a> {    fn drop(&mut self) {        self.0.pop();    }} fn write_file(data: &[u8], path: &Path) -> Result<(), Error> {    let mut file = OpenOptions::new()        .write(true)        .create(true)        .append(false)        .open(path)        .map_err(|e| Error::IoOpen {            source: e,            path: path.to_owned(),        })?;    file.write_all(data).map_err(|e| Error::IoWrite {        source: e,        path: path.to_owned(),    })} fn create_dir(p: &Path) -> Result<(), Error> {    fs::create_dir_all(p).map_err(|e| Error::CreateDirectory {        source: e,        path: p.to_owned(),    })} /// Create a new `.git` repository of `kind` within the possibly non-existing `directory`/// and return its path.pub fn into(directory: impl Into<PathBuf>, kind: crate::Kind) -> Result<crate::Path, Error> {    let mut dot_git = directory.into();     match kind {        crate::Kind::Bare => {            if std::fs::read_dir(&dot_git)                .map_err(|err| Error::IoOpen {                    source: err,                    path: dot_git.clone(),                })?                .count()                != 0            {                return Err(Error::DirectoryNotEmpty { path: dot_git });            }        }        crate::Kind::WorkTree => {            dot_git.push(GIT_DIR_NAME);             if dot_git.is_dir() {                return Err(Error::DirectoryExists { path: dot_git });            }        }    }    create_dir(&dot_git)?;     {        let mut cursor = NewDir(&mut dot_git).at("info")?;        write_file(TPL_INFO_EXCLUDE, PathCursor(cursor.as_mut()).at("exclude"))?;    }     {        let mut cursor = NewDir(&mut dot_git).at("hooks")?;        for (tpl, filename) in &[            (TPL_HOOKS_UPDATE, "update.sample"),            (TPL_HOOKS_PREPARE_COMMIT_MSG, "prepare-commit-msg.sample"),            (TPL_HOOKS_PRE_RECEIVE, "pre-receive.sample"),            (TPL_HOOKS_PRE_REBASE, "pre-rebase.sample"),            (TPL_HOOKS_PRE_PUSH, "pre-push.sample"),            (TPL_HOOKS_PRE_COMMIT, "pre-commit.sample"),            (TPL_HOOKS_PRE_MERGE_COMMIT, "pre-merge-commit.sample"),            (TPL_HOOKS_PRE_APPLYPATCH, "pre-applypatch.sample"),            (TPL_HOOKS_POST_UPDATE, "post-update.sample"),            (TPL_HOOKS_FSMONITOR_WATCHMAN, "fsmonitor-watchman.sample"),            (TPL_HOOKS_COMMIT_MSG, "commit-msg.sample"),            (TPL_HOOKS_APPLYPATCH_MSG, "applypatch-msg.sample"),        ] {            write_file(tpl, PathCursor(cursor.as_mut()).at(filename))?;        }    }     {        let mut cursor = NewDir(&mut dot_git).at("objects")?;        create_dir(PathCursor(cursor.as_mut()).at("info"))?;        create_dir(PathCursor(cursor.as_mut()).at("pack"))?;    }     {        let mut cursor = NewDir(&mut dot_git).at("refs")?;        create_dir(PathCursor(cursor.as_mut()).at("heads"))?;        create_dir(PathCursor(cursor.as_mut()).at("tags"))?;    }     for (tpl, filename) in &[        (TPL_HEAD, "HEAD"),        (TPL_DESCRIPTION, "description"),        (TPL_CONFIG, "config"),    ] {        if *filename == "config" {            write_file(                &tpl.replace(                    "{bare-value}",                    match kind {                        crate::Kind::Bare => "true",                        crate::Kind::WorkTree => "false",                    },                ),                PathCursor(&mut dot_git).at(filename),            )?;        } else {            write_file(tpl, PathCursor(&mut dot_git).at(filename))?;        }    }     Ok(crate::Path::from_dot_git_dir(dot_git, kind))}