use std::process::{Command, Stdio}; use bstr::{BString, ByteSlice, ByteVec}; use crate::{helper, Program}; /// The kind of helper program to use.#[derive(Debug, Clone, Eq, PartialEq)]pub enum Kind {    /// The built-in `git credential` helper program, part of any `git` distribution.    Builtin,    /// A custom credentials helper, as identified just by the name with optional arguments    ExternalName {        /// The name like `foo` along with optional args, like `foo --arg --bar="a b"`, with arguments using `sh` shell quoting rules.        /// The program executed will be `git-credential-foo` if `name_and_args` starts with `foo`.        name_and_args: BString,    },    /// A custom credentials helper, as identified just by the absolute path to the program and optional arguments. The program is executed through a shell.    ExternalPath {        /// The absolute path to the executable, like `/path/to/exe` along with optional args, like `/path/to/exe --arg --bar="a b"`, with arguments using `sh`        /// shell quoting rules.        path_and_args: BString,    },    /// A script to execute with `sh`.    ExternalShellScript(BString),} /// Initializationimpl Program {    /// Create a new program of the given `kind`.    pub fn from_kind(kind: Kind) -> Self {        Program {            kind,            child: None,            stderr: true,        }    }     /// Parse the given input as per the custom helper definition, supporting `!<script>`, `name` and `/absolute/name`, the latter two    /// also support arguments which are ignored here.    pub fn from_custom_definition(input: impl Into<BString>) -> Self {        let mut input = input.into();        let kind = if input.starts_with(b"!") {            input.remove(0);            Kind::ExternalShellScript(input)        } else {            let path = git_path::from_bstr(                input                    .find_byte(b' ')                    .map_or(input.as_slice(), |pos| &input[..pos])                    .as_bstr(),            );            if git_path::is_absolute(path) {                Kind::ExternalPath { path_and_args: input }            } else {                input.insert_str(0, "git credential-");                Kind::ExternalName { name_and_args: input }            }        };        Program {            kind,            child: None,            stderr: true,        }    }} /// Builderimpl Program {    /// By default `stderr` of programs is inherited and typically displayed in the terminal.    pub fn suppress_stderr(mut self) -> Self {        self.stderr = false;        self    }} impl Program {    pub(crate) fn start(        &mut self,        action: &helper::Action,    ) -> std::io::Result<(std::process::ChildStdin, Option<std::process::ChildStdout>)> {        assert!(self.child.is_none(), "BUG: must not call `start()` twice");        let mut cmd = match &self.kind {            Kind::Builtin => {                let mut cmd = Command::new(cfg!(windows).then(|| "git.exe").unwrap_or("git"));                cmd.arg("credential").arg(action.as_arg(false));                cmd            }            Kind::ExternalShellScript(for_shell)            | Kind::ExternalName {                name_and_args: for_shell,            }            | Kind::ExternalPath {                path_and_args: for_shell,            } => git_command::prepare(git_path::from_bstr(for_shell.as_bstr()).as_ref())                .with_shell()                .arg(action.as_arg(true))                .into(),        };        cmd.stdin(Stdio::piped())            .stdout(if action.expects_output() {                Stdio::piped()            } else {                Stdio::null()            })            .stderr(if self.stderr { Stdio::inherit() } else { Stdio::null() });        let mut child = cmd.spawn()?;        let stdin = child.stdin.take().expect("stdin to be configured");        let stdout = child.stdout.take();         self.child = child.into();        Ok((stdin, stdout))    }     pub(crate) fn finish(&mut self) -> std::io::Result<()> {        let mut child = self.child.take().expect("Call `start()` before calling finish()");        let status = child.wait()?;        if status.success() {            Ok(())        } else {            Err(std::io::Error::new(                std::io::ErrorKind::Other,                format!("Credentials helper program failed with status code {:?}", status.code()),            ))        }    }} ///pub mod main;pub use main::function::main;