Add shell command framework #6

Added the shell_commands module that will either let you run a command or automatically use `sh - c` to run a command.

src/main.rs

@@ -23,6 +23,8 @@ fn main() {
     }
 
     println!("Here we do things");
+
+    shell_commands::execute_in_sh("sudo pacman -Syu").unwrap();
 }
 
 fn copyright_notice() -> &'static str {

src/shell_commands.rs

@@ -0,0 +1,32 @@
+/*
+    Rust Arch Linux Updater
+    Copyright (C) 2024 Luke Harding <luke@lukeh990.io>
+    This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+    You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/*
+    shell_commands.rs
+    This file contains utility functions to interact with the shell.
+*/
+
+use std::ffi::OsStr;
+use std::io;
+use std::process::Command;
+
+pub fn execute_and_display<S: AsRef<OsStr>, I>(cmd: S, args: I) -> io::Result<()>
+where
+    I: IntoIterator,
+    I::Item: AsRef<OsStr>,
+{
+    let mut child = Command::new(cmd).args(args).spawn()?;
+
+    child.wait()?;
+
+    Ok(())
+}
+
+pub fn execute_in_sh(cmd: &'static str) -> io::Result<()> {
+    execute_and_display("sh", ["-c", cmd])
+}