fix: blueprint still needs to load older plutus versions

crates/aiken-lang/src/plutus_version.rs

@@ -4,9 +4,7 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Default, Deserialize, Serialize, Clone, Copy, PartialEq)]
 #[serde(rename_all = "camelCase")]
 pub enum PlutusVersion {
-    #[serde(skip_deserializing)]
     V1,
-    #[serde(skip_deserializing)]
     V2,
     #[default]
     V3,

crates/aiken-project/src/config.rs

@@ -26,7 +26,7 @@ pub struct Config {
         default = "default_version"
     )]
     pub compiler: Version,
-    #[serde(default)]
+    #[serde(default, deserialize_with = "validate_v3_only")]
     pub plutus: PlutusVersion,
     pub license: Option<String>,
     #[serde(default)]
@@ -376,6 +376,18 @@ impl Config {
     }
 }
 
+fn validate_v3_only<'de, D>(deserializer: D) -> Result<PlutusVersion, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    let version = PlutusVersion::deserialize(deserializer)?;
+
+    match version {
+        PlutusVersion::V3 => Ok(version),
+        _ => Err(serde::de::Error::custom("Aiken only supports Plutus V3")),
+    }
+}
+
 mod built_info {
     include!(concat!(env!("OUT_DIR"), "/built.rs"));
 }

crates/aiken/src/cmd/blueprint/convert.rs

@@ -1,6 +1,5 @@
 use aiken_project::{
     blueprint::{error::Error as BlueprintError, Blueprint},
-    config::Config,
     error::Error as ProjectError,
 };
 use clap::ValueEnum;
@@ -22,7 +21,7 @@ pub struct Args {
     #[clap(short, long)]
     validator: Option<String>,
 
-    // Format to convert to
+    /// Format to convert to
     #[clap(long, default_value = "cardano-cli")]
     to: Format,
 }
@@ -56,13 +55,6 @@ pub fn exec(
     let blueprint: Blueprint =
         serde_json::from_reader(BufReader::new(blueprint)).into_diagnostic()?;
 
-    let opt_config = Config::load(&project_path).ok();
-
-    let cardano_cli_type = opt_config
-        .map(|config| config.plutus)
-        .unwrap_or_default()
-        .cardano_cli_type();
-
     // Perform the conversion
     let when_too_many =
         |known_validators| ProjectError::MoreThanOneValidatorFound { known_validators };
@@ -85,6 +77,8 @@ pub fn exec(
 
                 let cbor_hex = hex::encode(double_cbor_bytes);
 
+                let cardano_cli_type = blueprint.preamble.plutus_version.cardano_cli_type();
+
                 Ok(json!({
                     "type": cardano_cli_type,
                     "description": "Generated by Aiken",