fix convert feature without source

lib/Cargo.toml

@@ -30,8 +30,15 @@ source_async = [
     "futures-util",
     "async-stream",
 ]
-convert = []
-convert_async = ["futures", "futures-core", "futures-util", "async-stream"]
+convert = ["zip"]
+convert_async = [
+    "futures",
+    "futures-core",
+    "futures-util",
+    "async-stream",
+    "async_zip",
+    "tokio",
+]
 
 [dependencies]
 serde = "1.0"

lib/src/lib.rs

@@ -3,6 +3,11 @@ pub mod async_db;
 #[cfg(feature = "sync")]
 pub mod db;
 pub mod questions;
-#[cfg(any(feature = "source", feature = "source_async"))]
+#[cfg(any(
+    feature = "source",
+    feature = "source_async",
+    feature = "convert",
+    feature = "convert_async"
+))]
 pub mod source;
 pub mod util;

lib/src/source.rs

@@ -103,7 +103,7 @@ pub struct SourceQuestionsBatch {
     pub questions: Vec<SourceQuestion>,
 }
 
-#[cfg(feature = "source")]
+#[cfg(any(feature = "convert", feature = "source"))]
 pub mod reader_sync {
     use std::io::{Read, Seek};
     use zip::ZipArchive;
@@ -211,10 +211,10 @@ pub mod reader_sync {
     }
 }
 
-#[cfg(feature = "source")]
+#[cfg(any(feature = "convert", feature = "source"))]
 pub use reader_sync::{ReadSourceQuestionsBatches, SourceQuestionsZipReader};
 
-#[cfg(feature = "source_async")]
+#[cfg(any(feature = "convert_async", feature = "source_async"))]
 pub mod reader_async {
     use async_stream::stream;
     use async_zip::tokio::read::seek::ZipFileReader;
@@ -326,5 +326,5 @@ pub mod reader_async {
         }
     }
 }
-#[cfg(feature = "source_async")]
+#[cfg(any(feature = "convert_async", feature = "source_async"))]
 pub use reader_async::{ReadSourceQuestionsBatchesAsync, SourceQuestionsZipReaderAsync};