diff --git a/src/adapters/spawning.rs b/src/adapters/spawning.rs
index 186566f..70962bd 100644
--- a/src/adapters/spawning.rs
+++ b/src/adapters/spawning.rs
@@ -96,7 +96,7 @@ pub fn pipe_output<'a>(
 
     tokio::spawn(async move {
         let mut z = inp;
-        tokio::io::copy(&mut z, &mut stdi).await;
+        tokio::io::copy(&mut z, &mut stdi).await.unwrap();
     });
     Ok(Box::pin(stdo.chain(proc_wait(cmd))))
 }
@@ -177,7 +177,7 @@ mod test {
         let input = format!("{0}{0}{0}{0}", input);
         let (a, d) = simple_adapt_info(
             &Path::new("foo.txt"),
-            Box::pin(Cursor::new(input.as_bytes())),
+            Box::pin(Cursor::new(Vec::from(input))),
         );
         let output = adapter.adapt(a, &d).unwrap();
 
diff --git a/src/preproc.rs b/src/preproc.rs
index 11bf317..16a6c73 100644
--- a/src/preproc.rs
+++ b/src/preproc.rs
@@ -1,3 +1,4 @@
+use crate::adapted_iter::AdaptedFilesIterBox;
 use crate::adapters::*;
 use crate::caching_writer::async_read_and_write_to_cache;
 use crate::config::RgaConfig;
@@ -8,10 +9,12 @@ use crate::{
     print_bytes,
 };
 use anyhow::*;
+use async_compression::tokio::bufread::ZstdDecoder;
 use log::*;
 use path_clean::PathClean;
 // use postproc::PostprocPrefix;
 use std::convert::TryInto;
+use std::io::Cursor;
 use std::path::Path;
 use tokio::io::AsyncBufRead;
 use tokio::io::AsyncBufReadExt;
@@ -146,15 +149,6 @@ async fn run_adapter_recursively(
     detection_reason: FileMatcher,
     active_adapters: ActiveAdapters,
 ) -> Result<ReadBox> {
-    let AdaptInfo {
-        filepath_hint,
-        is_real_file,
-        inp,
-        line_prefix,
-        config,
-        archive_recursion_depth,
-        postprocess,
-    } = ai;
     let meta = adapter.metadata();
     debug!(
         "Chose adapter '{}' because of matcher {:?}",
@@ -162,50 +156,30 @@ async fn run_adapter_recursively(
     );
     eprintln!(
         "{} adapter: {}",
-        filepath_hint.to_string_lossy(),
+        ai.filepath_hint.to_string_lossy(),
         &meta.name
     );
     let db_name = format!("{}.v{}", meta.name, meta.version);
-    let cache_compression_level = config.cache.compression_level;
-    let cache_max_blob_len = config.cache.max_blob_len;
+    let cache_compression_level = ai.config.cache.compression_level;
+    let cache_max_blob_len = ai.config.cache.max_blob_len;
 
-    let cache = if is_real_file {
-        LmdbCache::open(&config.cache)?
+    let cache = if ai.is_real_file {
+        LmdbCache::open(&ai.config.cache)?
     } else {
         None
     };
 
     let mut cache = cache.context("No cache?")?;
-    let cache_key: Vec<u8> = compute_cache_key(&filepath_hint, adapter.as_ref(), active_adapters)?;
+    let cache_key: Vec<u8> =
+        compute_cache_key(&ai.filepath_hint, adapter.as_ref(), active_adapters)?;
     // let dbg_ctx = format!("adapter {}", &adapter.metadata().name);
     let cached = cache.get(&db_name, &cache_key)?;
     match cached {
-        Some(cached) => Ok(Box::pin(
-            async_compression::tokio::bufread::ZstdDecoder::new(std::io::Cursor::new(cached)),
-        )),
+        Some(cached) => Ok(Box::pin(ZstdDecoder::new(Cursor::new(cached)))),
         None => {
             debug!("cache MISS, running adapter");
             debug!("adapting with caching...");
-            let inp = adapter
-                .adapt(
-                    AdaptInfo {
-                        line_prefix,
-                        filepath_hint: filepath_hint.clone(),
-                        is_real_file,
-                        inp,
-                        archive_recursion_depth,
-                        config,
-                        postprocess,
-                    },
-                    &detection_reason,
-                )
-                .with_context(|| {
-                    format!(
-                        "adapting {} via {} failed",
-                        filepath_hint.to_string_lossy(),
-                        meta.name
-                    )
-                })?;
+            let inp = loop_adapt(adapter.as_ref(), detection_reason, ai)?;
             let inp = concat_read_streams(inp);
             let inp = async_read_and_write_to_cache(
                 inp,
@@ -228,3 +202,16 @@ async fn run_adapter_recursively(
         }
     }
 }
+
+fn loop_adapt(
+    adapter: &dyn FileAdapter,
+    detection_reason: FileMatcher,
+    ai: AdaptInfo,
+) -> anyhow::Result<AdaptedFilesIterBox> {
+    let fph = ai.filepath_hint.clone();
+    let inp = adapter
+        .adapt(ai, &detection_reason)
+        .with_context(|| format!("adapting {} via {} failed", fph.to_string_lossy(), adapter.metadata().name))?;
+
+    Ok(inp)
+}
diff --git a/src/test_utils.rs b/src/test_utils.rs
index 2a6b870..0efce30 100644
--- a/src/test_utils.rs
+++ b/src/test_utils.rs
@@ -33,7 +33,7 @@ pub fn simple_adapt_info<'a>(filepath: &Path, inp: ReadBox) -> (AdaptInfo, FileM
     )
 }
 
-pub async fn adapted_to_vec(adapted: AdaptedFilesIterBox<'_>) -> Result<Vec<u8>> {
+pub async fn adapted_to_vec(adapted: AdaptedFilesIterBox) -> Result<Vec<u8>> {
     let mut res = concat_read_streams(adapted);
 
     let mut buf = Vec::new();