Move self-update to a module

src/self_update.rs

@@ -0,0 +1,44 @@
+use super::terminal::Terminal;
+use failure::Error;
+use self_update_crate;
+use std::env;
+#[cfg(unix)]
+use std::os::unix::process::CommandExt;
+#[cfg(unix)]
+use std::process::Command;
+
+pub fn self_update(terminal: &mut Terminal) -> Result<(), Error> {
+    terminal.print_separator("Self update");
+    #[cfg(unix)]
+    let current_exe = env::current_exe();
+
+    let target = self_update_crate::get_target()?;
+    let result = self_update_crate::backends::github::Update::configure()?
+        .repo_owner("r-darwish")
+        .repo_name("topgrade")
+        .target(&target)
+        .bin_name(if cfg!(windows) { "topgrade.exe" } else { "topgrade" })
+        .show_output(false)
+        .show_download_progress(true)
+        .current_version(self_update_crate::cargo_crate_version!())
+        .no_confirm(true)
+        .build()?
+        .update()?;
+
+    if let self_update_crate::Status::Updated(version) = &result {
+        println!("\nTopgrade upgraded to {}", version);
+    } else {
+        println!("Topgrade is up-to-date");
+    }
+
+    #[cfg(unix)]
+    {
+        if result.updated() {
+            terminal.print_warning("Respawning...");
+            let err = Command::new(current_exe?).args(env::args().skip(1)).exec();
+            Err(err)?
+        }
+    }
+
+    Ok(())
+}