Add export support

src/scripts/base.rs

@@ -0,0 +1,23 @@
+use crate::types::*;
+use anyhow::Result;
+
+pub trait ScriptBuilder {
+    fn default_encoding(&self) -> Encoding;
+
+    fn build_script(
+        &self,
+        filename: &str,
+        encoding: Encoding,
+        config: &ExtraConfig,
+    ) -> Result<Box<dyn Script>>;
+
+    fn extensions(&self) -> &'static [&'static str];
+
+    fn script_type(&self) -> &'static ScriptType;
+}
+
+pub trait Script: std::fmt::Debug {
+    fn default_output_script_type(&self) -> OutputScriptType;
+
+    fn extract_messages(&self) -> Result<Vec<Message>>;
+}