version slice

src/lib.rs

@@ -41,8 +41,8 @@ pub trait AppConfig: Sized + Serialize + DeserializeOwned + Debug + Default {
     fn configure<'a>(self, _clap: &clap::ArgMatches<'a>) -> Fallible<Self::Init>;
 
     /// Initialize the app
-    fn init(name: &str, cfg_file_name: &str, version: Option<String>) -> Fallible<Self::Init> {
-        let version: String = version.unwrap_or_else(|| env!("CARGO_PKG_VERSION").into());
+    fn init(name: &str, cfg_file_name: &str, version: Option<&str>) -> Fallible<Self::Init> {
+        let version = version.unwrap_or_else(|| env!("CARGO_PKG_VERSION"));
         let clap = clap::App::new(name)
             .arg(
                 clap::Arg::with_name("config")
@@ -88,7 +88,7 @@ pub trait AppConfig: Sized + Serialize + DeserializeOwned + Debug + Default {
         let clap = Self::add_args(clap);
 
         // this must be done after `add_args` or all hell breaks loose around lifetimes
-        let clap = clap.version(version.as_str());
+        let clap = clap.version(version);
 
         let argv = clap.get_matches();