feat(macros): add convenience macro to get a typed value

clap-rs · Apr 14, 2015 · 8752700 · 8752700
1 parent b67f2e5
commit 8752700
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/src/macros.rs b/src/macros.rs
@@ -27,4 +27,20 @@ macro_rules! for_match {
 			}
 		}
 	};
+}
+
+/// Convenience macro getting a typed value
+#[macro_export]
+macro_rules! value_t {
+	($m:ident.value_of($v:expr), $t:ty) => {
+		match $m.value_of($v) {
+			Some(v) => {
+				match v.parse::<$t>() {
+					Ok(val) => Ok(val),
+					Err(_)  => Err(format!("{} isn't a valid {}",v,stringify!($t))),
+				}
+			},
+			None => Err(format!("Argument not found"))
+		}
+	};
 }