Validate licenses in init

crates/dinopkg-cli/Cargo.toml

@@ -24,3 +24,4 @@ maplit = "1.0.2"
 serde_json = "1.0.120"
 syntect = "5.2.0"
 validate_package_name = { path = "../validate_package_name" }
+spdx = "0.10.6"

crates/dinopkg-cli/src/command/init.rs

@@ -84,6 +84,12 @@ pub async fn init() -> Result<()> {
         .interact_text()?;
     let license: String = Input::with_theme(&ColorfulTheme::default())
         .with_prompt("License")
+        .validate_with(|input: &String| {
+            spdx::Expression::parse(input).map_or_else(
+                |err| Err(format!("license is invalid:\n{}", err.to_string())),
+                |_| Ok(()),
+            )
+        })
         .default("MIT".into())
         .interact_text()?;