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    /*
    # Git Testing Support

    ## Creating a git dependency
    `git::new()` is an easy way to create a new git repository containing a
    project that you can then use as a dependency. It will automatically add all
    the files you specify in the project and commit them to the repository.
    Example:

    ```
    let git_project = git::new("dep1", |project| {
        project
            .file("Cargo.toml", &basic_manifest("dep1", "1.0.0"))
            .file("src/lib.rs", r#"pub fn f() { println!("hi!"); } "#)
    });

    // Use the `url()` method to get the file url to the new repository.
    let p = project()
        .file("Cargo.toml", &format!(r#"
            [package]
            name = "a"
            version = "1.0.0"

            [dependencies]
            dep1 = {{ git = '{}' }}
        "#, git_project.url()))
        .file("src/lib.rs", "extern crate dep1;")
        .build();
    ```

    ## Manually creating repositories
    `git::repo()` can be used to create a `RepoBuilder` which provides a way of
    adding files to a blank repository and committing them.

    If you want to then manipulate the repository (such as adding new files or
    tags), you can use `git2::Repository::open()` to open the repository and then
    use some of the helper functions in this file to interact with the repository.

    */

    use crate::{path2url, project, Project, ProjectBuilder, SymlinkBuilder};
    use std::fs;
    use std::path::{Path, PathBuf};
    use std::sync::Once;
    use url::Url;

    #[must_use]
    pub struct RepoBuilder {
        repo: git2::Repository,
        files: Vec<PathBuf>,
    }

    pub struct Repository(git2::Repository);

    /// Create a `RepoBuilder` to build a new git repository.
    ///
    /// Call `build()` to finalize and create the repository.
    pub fn repo(p: &Path) -> RepoBuilder {
        RepoBuilder::init(p)
    }

    impl RepoBuilder {
        pub fn init(p: &Path) -> RepoBuilder {
            t!(fs::create_dir_all(p.parent().unwrap()));
            let repo = init(p);
            RepoBuilder {
                repo,
                files: Vec::new(),
            }
        }

        /// Add a file to the repository.
        pub fn file(self, path: &str, contents: &str) -> RepoBuilder {
            let mut me = self.nocommit_file(path, contents);
            me.files.push(PathBuf::from(path));
            me
        }

        /// Create a symlink to a directory
        pub fn nocommit_symlink_dir<T: AsRef<Path>>(self, dst: T, src: T) -> Self {
            let workdir = self.repo.workdir().unwrap();
            SymlinkBuilder::new_dir(workdir.join(dst), workdir.join(src)).mk();
            self
        }

        /// Add a file that will be left in the working directory, but not added
        /// to the repository.
        pub fn nocommit_file(self, path: &str, contents: &str) -> RepoBuilder {
            let dst = self.repo.workdir().unwrap().join(path);
            t!(fs::create_dir_all(dst.parent().unwrap()));
            t!(fs::write(&dst, contents));
            self
        }

        /// Create the repository and commit the new files.
        pub fn build(self) -> Repository {
            {
                let mut index = t!(self.repo.index());
                for file in self.files.iter() {
                    t!(index.add_path(file));
                }
                t!(index.write());
                let id = t!(index.write_tree());
                let tree = t!(self.repo.find_tree(id));
                let sig = t!(self.repo.signature());
                t!(self
                    .repo
                    .commit(Some("HEAD"), &sig, &sig, "Initial commit", &tree, &[]));
            }
            let RepoBuilder { repo, .. } = self;
            Repository(repo)
        }
    }

    impl Repository {
        pub fn root(&self) -> &Path {
            self.0.workdir().unwrap()
        }

        pub fn url(&self) -> Url {
            path2url(self.0.workdir().unwrap().to_path_buf())
        }

        pub fn revparse_head(&self) -> String {
            self.0
                .revparse_single("HEAD")
                .expect("revparse HEAD")
                .id()
                .to_string()
        }
    }

    /// Initialize a new repository at the given path.
    pub fn init(path: &Path) -> git2::Repository {
        default_search_path();
        let repo = t!(git2::Repository::init(path));
        default_repo_cfg(&repo);
        repo
    }

    fn default_search_path() {
        use crate::paths::global_root;
        use git2::{opts::set_search_path, ConfigLevel};

        static INIT: Once = Once::new();
        INIT.call_once(|| unsafe {
            let path = global_root().join("blank_git_search_path");
            t!(set_search_path(ConfigLevel::System, &path));
            t!(set_search_path(ConfigLevel::Global, &path));
            t!(set_search_path(ConfigLevel::XDG, &path));
            t!(set_search_path(ConfigLevel::ProgramData, &path));
        })
    }

    fn default_repo_cfg(repo: &git2::Repository) {
        let mut cfg = t!(repo.config());
        t!(cfg.set_str("user.email", "foo@bar.com"));
        t!(cfg.set_str("user.name", "Foo Bar"));
    }

    /// Create a new git repository with a project.
    pub fn new<F>(name: &str, callback: F) -> Project
    where
        F: FnOnce(ProjectBuilder) -> ProjectBuilder,
    {
        new_repo(name, callback).0
    }

    /// Create a new git repository with a project.
    /// Returns both the Project and the git Repository.
    pub fn new_repo<F>(name: &str, callback: F) -> (Project, git2::Repository)
    where
        F: FnOnce(ProjectBuilder) -> ProjectBuilder,
    {
        let mut git_project = project().at(name);
        git_project = callback(git_project);
        let git_project = git_project.build();

        let repo = init(&git_project.root());
        add(&repo);
        commit(&repo);
        (git_project, repo)
    }

    /// Add all files in the working directory to the git index.
    pub fn add(repo: &git2::Repository) {
        let mut index = t!(repo.index());
        t!(index.add_all(["*"].iter(), git2::IndexAddOption::DEFAULT, None));
        t!(index.write());
    }

    /// Add a git submodule to the repository.
    pub fn add_submodule<'a>(
        repo: &'a git2::Repository,
        url: &str,
        path: &Path,
    ) -> git2::Submodule<'a> {
        let path = path.to_str().unwrap().replace(r"\", "/");
        let mut s = t!(repo.submodule(url, Path::new(&path), false));
        let subrepo = t!(s.open());
        default_repo_cfg(&subrepo);
        t!(subrepo.remote_add_fetch("origin", "refs/heads/*:refs/heads/*"));
        let mut origin = t!(subrepo.find_remote("origin"));
        t!(origin.fetch(&Vec::<String>::new(), None, None));
        t!(subrepo.checkout_head(None));
        t!(s.add_finalize());
        s
    }

    /// Commit changes to the git repository.
    pub fn commit(repo: &git2::Repository) -> git2::Oid {
        let tree_id = t!(t!(repo.index()).write_tree());
        let sig = t!(repo.signature());
        let mut parents = Vec::new();
        if let Some(parent) = repo.head().ok().map(|h| h.target().unwrap()) {
            parents.push(t!(repo.find_commit(parent)))
        }
        let parents = parents.iter().collect::<Vec<_>>();
        t!(repo.commit(
            Some("HEAD"),
            &sig,
            &sig,
            "test",
            &t!(repo.find_tree(tree_id)),
            &parents
        ))
    }

    /// Create a new tag in the git repository.
    pub fn tag(repo: &git2::Repository, name: &str) {
        let head = repo.head().unwrap().target().unwrap();
        t!(repo.tag(
            name,
            &t!(repo.find_object(head, None)),
            &t!(repo.signature()),
            "make a new tag",
            false
        ));
    }

    /// Returns true if gitoxide is globally activated.
    ///
    /// That way, tests that normally use `git2` can transparently use `gitoxide`.
    pub fn cargo_uses_gitoxide() -> bool {
        std::env::var_os("__CARGO_USE_GITOXIDE_INSTEAD_OF_GIT2").map_or(false, |value| value == "1")
    }