Validate licenses in init

Cargo.lock

@@ -366,6 +366,7 @@ dependencies = [
  "maplit",
  "owo-colors 4.0.0",
  "serde_json",
+ "spdx",
  "syntect",
  "tokio",
  "validate_package_name",
@@ -1249,6 +1250,15 @@ version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 
+[[package]]
+name = "spdx"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47317bbaf63785b53861e1ae2d11b80d6b624211d42cb20efcd210ee6f8a14bc"
+dependencies = [
+ "smallvec",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"

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()?;