made more consistent output without git

1 files changed, 7 insertions, 8 deletions

diff --git a/mumd/build.rs b/mumd/build.rs
index f09b1c4..78f279f 100644
--- a/mumd/build.rs
+++ b/mumd/build.rs
@@ -1,20 +1,19 @@
 use std::process::Command;
 
 fn main() {
-    let version = format!(
-        "{} {}-{}",
-        env!("CARGO_PKG_NAME"),
-        env!("CARGO_PKG_VERSION"),
-        commit_hash().unwrap_or_else(|| "???".to_string()),
-    );
+    let maybe_hash = commit_hash();
+    let version = match maybe_hash.as_deref() {
+        None | Some("") => format!("v{}", env!("CARGO_PKG_VERSION")),
+        Some(version) => version.to_string(),
+    };
 
     println!("cargo:rustc-env=VERSION={}", version);
 }
 
 fn commit_hash() -> Option<String> {
     let output = Command::new("git")
-                         .arg("show")
-                         .arg("--pretty=format:%h")  // abbrev hash
+                         .arg("describe")
+                         .arg("--tags")
                          .current_dir(env!("CARGO_MANIFEST_DIR"))
                          .output();
     output.ok().map(|o| String::from_utf8_lossy(&o.stdout).to_string())