archive: Add install exporting

This exports all contents in your vento directory into an xz tarball.
Needs documentation, but essentially it works using `vento -E`. Mind the
uppercase E there!

src/archive.rs

@@ -51,3 +51,21 @@ pub fn export_inv(slot: &str, output: PathBuf, message: bool) -> Result<()> {
     };
     Ok(())
 }
+
+pub fn export_install(output: PathBuf, message: bool) -> Result<()> {
+    let dir: PathBuf = common::env_config()?.vento_dir;
+
+    let archive = File::create(&output)?;
+    let enc = XzEncoder::new(archive, 9);
+    let mut tar = tar::Builder::new(enc);
+    tar.append_dir_all("", dir)?;
+
+    if message {
+        println!(
+            "✅ {} {}",
+            "Exported Vento install into".green(),
+            &output.to_str().unwrap()
+        );
+    };
+    Ok(())
+}

src/bin/vento.rs

@@ -60,6 +60,11 @@ fn main() -> Result<()> {
                     2 => archive::export_inv("active", PathBuf::from("active.tar.xz"), true)?,
                     _ => throw_error(ErrorType::TooManyArgs)?,
                 },
+                "-E" | "--export-install" => match args.len() {
+                    3 => archive::export_install(PathBuf::from(&args[2]), true)?,
+                    2 => archive::export_install(PathBuf::from("vento.tar.xz"), true)?,
+                    _ => throw_error(ErrorType::TooManyArgs)?,
+                },
                 "-s" => match args.len() {
                     4 => inv::list(&args[2], &args[3])?,
                     3 => inv::list(&args[2], "")?,