Initial structure for unhighlighted source blocks.

src/context/src_block.rs

@@ -9,7 +9,9 @@ use crate::intermediate::ISrcBlock;
 #[derive(Debug, Serialize)]
 #[serde(tag = "type")]
 #[serde(rename = "src_block")]
-pub(crate) struct RenderSrcBlock {}
+pub(crate) struct RenderSrcBlock {
+    lines: Vec<String>,
+}
 
 impl RenderSrcBlock {
     pub(crate) fn new(
@@ -18,6 +20,8 @@ impl RenderSrcBlock {
         output_file: &Path,
         original: &ISrcBlock,
     ) -> Result<RenderSrcBlock, CustomError> {
-        Ok(RenderSrcBlock {})
+        Ok(RenderSrcBlock {
+            lines: original.lines.clone(),
+        })
     }
 }