fix placeholder error message

src/cli.rs

@@ -21,7 +21,7 @@ pub struct Opts {
     pub indent: usize,
 }
 
-#[derive(Clone, ValueEnum)]
+#[derive(Clone, Debug, ValueEnum)]
 #[clap(rename_all = "camelCase")]
 pub enum Fetcher {
     FetchFromGitHub,

src/main.rs

@@ -48,10 +48,14 @@ fn main() -> Result<()> {
         }
 
         (
-            Some(Fetcher::FetchFromGitHub | Fetcher::FetchFromGitLab | Fetcher::FetchFromSourcehut),
+            Some(
+                fetcher @ (Fetcher::FetchFromGitHub
+                | Fetcher::FetchFromGitLab
+                | Fetcher::FetchFromSourcehut),
+            ),
             None,
         ) => {
-            bail!("bad");
+            bail!("{fetcher:?} does not support URLs without a host");
         }
 
         (Some(Fetcher::Fetchgit), _) | (None, _) => {