amv improvements

avm/src/lib.rs

@@ -70,8 +70,24 @@ pub fn use_version(version: &Version) -> Result<()> {
     Ok(())
 }
 
+/// Update to latest stable version
+pub fn update() -> Result<()> {
+    // Find last stable version
+    let version = &get_latest_version();
+
+    install_version(version)?;
+    Ok(())
+}
+
 /// Install a version of anchor-cli
 pub fn install_version(version: &Version) -> Result<()> {
+    // If version is already installed we ignore the request.
+    let installed_versions = read_installed_versions();
+    if installed_versions.contains(version) {
+        println!("Version {} is already installed", version);
+        return Ok(());
+    }
+
     let exit = std::process::Command::new("cargo")
         .args(&[
             "install",
@@ -105,6 +121,8 @@ pub fn install_version(version: &Version) -> Result<()> {
         let mut current_version_file = fs::File::create(current_version_file_path().as_path())?;
         current_version_file.write_all(version.to_string().as_bytes())?;
     }
+
+    use_version(version)?;
     Ok(())
 }
 

avm/src/main.rs

@@ -30,6 +30,8 @@ pub enum Commands {
     },
     #[clap(about = "List available versions of Anchor")]
     List {},
+    #[clap(about = "Update to the latest Anchor version")]
+    Update {},
 }
 
 // If `latest` is passed use the latest available version.
@@ -46,6 +48,7 @@ pub fn entry(opts: Cli) -> Result<()> {
         Commands::Install { version } => avm::install_version(&version),
         Commands::Uninstall { version } => avm::uninstall_version(&version),
         Commands::List {} => avm::list_versions(),
+        Commands::Update {} => avm::update(),
     }
 }