1 files changed, 141 insertions, 0 deletions
diff --git a/vendor/gix-command/src/lib.rs b/vendor/gix-command/src/lib.rs
new file mode 100644
index 000000000..9e662b016
--- /dev/null
+++ b/vendor/gix-command/src/lib.rs
@@ -0,0 +1,141 @@
+//! Launch commands very similarly to `Command`, but with `git` specific capabilities and adjustments.
+#![deny(rust_2018_idioms, missing_docs)]
+#![forbid(unsafe_code)]
+
+use std::ffi::OsString;
+
+/// A structure to keep settings to use when invoking a command via [`spawn()`][Prepare::spawn()], after creating it with [`prepare()`].
+pub struct Prepare {
+    /// The command to invoke (either with or without shell depending on `use_shell`.
+    pub command: OsString,
+    /// The way standard input is configured.
+    pub stdin: std::process::Stdio,
+    /// The way standard output is configured.
+    pub stdout: std::process::Stdio,
+    /// The way standard error is configured.
+    pub stderr: std::process::Stdio,
+    /// The arguments to pass to the spawned process.
+    pub args: Vec<OsString>,
+    /// environment variables to set in the spawned process.
+    pub env: Vec<(OsString, OsString)>,
+    /// If `true`, we will use `sh` to execute the `command`.
+    pub use_shell: bool,
+}
+
+mod prepare {
+    use std::{
+        ffi::OsString,
+        process::{Command, Stdio},
+    };
+
+    use bstr::ByteSlice;
+
+    use crate::Prepare;
+
+    /// Builder
+    impl Prepare {
+        /// If called, the command will not be executed directly, but with `sh`.
+        ///
+        /// This also allows to pass shell scripts as command, or use commands that contain arguments which are subsequently
+        /// parsed by `sh`.
+        pub fn with_shell(mut self) -> Self {
+            self.use_shell = self.command.to_str().map_or(true, |cmd| {
+                cmd.as_bytes().find_byteset(b"|&;<>()$`\\\"' \t\n*?[#~=%").is_some()
+            });
+            self
+        }
+
+        /// Unconditionally turn off using the shell when spawning the command.
+        /// Note that not using the shell is the default so an effective use of this method
+        /// is some time after [`with_shell()`][Prepare::with_shell()] was called.
+        pub fn without_shell(mut self) -> Self {
+            self.use_shell = false;
+            self
+        }
+
+        /// Configure the process to use `stdio` for _stdin.
+        pub fn stdin(mut self, stdio: Stdio) -> Self {
+            self.stdin = stdio;
+            self
+        }
+        /// Configure the process to use `stdio` for _stdout_.
+        pub fn stdout(mut self, stdio: Stdio) -> Self {
+            self.stdout = stdio;
+            self
+        }
+        /// Configure the process to use `stdio` for _stderr.
+        pub fn stderr(mut self, stdio: Stdio) -> Self {
+            self.stderr = stdio;
+            self
+        }
+
+        /// Add `arg` to the list of arguments to call the command with.
+        pub fn arg(mut self, arg: impl Into<OsString>) -> Self {
+            self.args.push(arg.into());
+            self
+        }
+
+        /// Add `args` to the list of arguments to call the command with.
+        pub fn args(mut self, args: impl IntoIterator<Item = impl Into<OsString>>) -> Self {
+            self.args
+                .append(&mut args.into_iter().map(Into::into).collect::<Vec<_>>());
+            self
+        }
+
+        /// Add `key` with `value` to the environment of the spawned command.
+        pub fn env(mut self, key: impl Into<OsString>, value: impl Into<OsString>) -> Self {
+            self.env.push((key.into(), value.into()));
+            self
+        }
+    }
+
+    /// Finalization
+    impl Prepare {
+        /// Spawn the command as configured.
+        pub fn spawn(self) -> std::io::Result<std::process::Child> {
+            Command::from(self).spawn()
+        }
+    }
+
+    impl From<Prepare> for Command {
+        fn from(mut prep: Prepare) -> Command {
+            let mut cmd = if prep.use_shell {
+                let mut cmd = Command::new(if cfg!(windows) { "sh" } else { "/bin/sh" });
+                cmd.arg("-c");
+                if !prep.args.is_empty() {
+                    prep.command.push(" \"$@\"")
+                }
+                cmd.arg(prep.command);
+                cmd.arg("--");
+                cmd
+            } else {
+                Command::new(prep.command)
+            };
+            cmd.stdin(prep.stdin)
+                .stdout(prep.stdout)
+                .stderr(prep.stderr)
+                .envs(prep.env)
+                .args(prep.args);
+            cmd
+        }
+    }
+}
+
+/// Prepare `cmd` for [spawning][std::process::Command::spawn()] by configuring it with various builder methods.
+///
+/// Note that the default IO is configured for typical API usage, that is
+///
+/// - `stdin` is null to prevent blocking unexpectedly on consumption of stdin
+/// - `stdout` is captured for consumption by the caller
+/// - `stderr` is inherited to allow the command to provide context to the user
+pub fn prepare(cmd: impl Into<OsString>) -> Prepare {
+    Prepare {
+        command: cmd.into(),
+        stdin: std::process::Stdio::null(),
+        stdout: std::process::Stdio::piped(),
+        stderr: std::process::Stdio::inherit(),
+        args: Vec::new(),
+        env: Vec::new(),
+        use_shell: false,
+    }
+}