fixed awkward semver version in issue #204

src/commands/download.rs

@@ -15,7 +15,7 @@ pub struct DownloadCommand {
     pub name: PackageName,
     #[clap(long, short, value_name = "VERSION")]
     /// The version requirement of the package to download; defaults to `*`.
-    pub version: Option<VersionReq>,
+    pub version: Option<String>,
 }
 
 impl DownloadCommand {
@@ -26,17 +26,19 @@ impl DownloadCommand {
 
         println!("downloading package `{name}`...", name = self.name);
 
+        // if user specifies exact verion, then set the `VersionReq` to exact match
+        let version = match &self.version {
+            Some(version) => VersionReq::parse(&format!("={}", version))?,
+            None => VersionReq::STAR,
+        };
+
         let res = client
-            .download(
-                &self.name,
-                self.version.as_ref().unwrap_or(&VersionReq::STAR),
-            )
+            .download(&self.name, &version)
             .await?
             .ok_or_else(|| {
                 anyhow!(
                     "a version of package `{name}` that satisfies `{version}` was not found",
                     name = self.name,
-                    version = self.version.as_ref().unwrap_or(&VersionReq::STAR)
                 )
             })?;