feat: getters of Command (#102)

Author: TD-Sky

src/lib.rs

@@ -862,6 +862,76 @@ impl Command {
         self
     }
 
+    /// Gets an iterator of the arguments that will be passed to the program.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::ffi::OsStr;
+    /// use async_process::Command;
+    ///
+    /// let mut cmd = Command::new("echo");
+    /// cmd.arg("first").arg("second");
+    /// let args: Vec<&OsStr> = cmd.get_args().collect();
+    /// assert_eq!(args, &["first", "second"]);
+    /// ```
+    pub fn get_args(&self) -> std::process::CommandArgs<'_> {
+        self.inner.get_args()
+    }
+
+    /// Gets an iterator of the environment variables explicitly set for the child process.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::ffi::OsStr;
+    /// use async_process::Command;
+    ///
+    /// let mut cmd = Command::new("ls");
+    /// cmd.env("TERM", "dumb").env_remove("TZ");
+    /// let envs: Vec<(&OsStr, Option<&OsStr>)> = cmd.get_envs().collect();
+    /// assert_eq!(envs, &[
+    ///     (OsStr::new("TERM"), Some(OsStr::new("dumb"))),
+    ///     (OsStr::new("TZ"), None)
+    /// ]);
+    /// ```
+    pub fn get_envs(&self) -> std::process::CommandEnvs<'_> {
+        self.inner.get_envs()
+    }
+
+    /// Gets the working directory for the child process.
+    ///
+    /// This returns [`None`] if the working directory will not be changed.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    /// use async_process::Command;
+    ///
+    /// let mut cmd = Command::new("ls");
+    /// assert_eq!(cmd.get_current_dir(), None);
+    /// cmd.current_dir("/bin");
+    /// assert_eq!(cmd.get_current_dir(), Some(Path::new("/bin")));
+    /// ```
+    pub fn get_current_dir(&self) -> Option<&Path> {
+        self.inner.get_current_dir()
+    }
+
+    /// Gets the path to the program that was given to [`Command::new`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use async_process::Command;
+    ///
+    /// let cmd = Command::new("echo");
+    /// assert_eq!(cmd.get_program(), "echo");
+    /// ```
+    pub fn get_program(&self) -> &OsStr {
+        self.inner.get_program()
+    }
+
     /// Removes an environment variable mapping.
     ///
     /// # Examples