Improve error output

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "rx-repack"
 description = "Rust re-write of px-repack"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/main.rs

@@ -1,3 +1,4 @@
+use anyhow::Context;
 use camino::Utf8PathBuf;
 use clap::Parser;
 use rx_repack::{json_message, repack};
@@ -65,5 +66,7 @@ fn main() -> anyhow::Result<()> {
         println!("{}", json_message(&dicom_file, &outcome)?);
     }
 
-    outcome.map(|_| ())
+    outcome
+        .with_context(|| format!("Failed to pack: {}", &dicom_file))
+        .map(|_| ())
 }

src/ndjson_log.rs

@@ -8,9 +8,9 @@ use std::os::unix::fs::MetadataExt;
 pub fn json_message(
     src: &Utf8Path,
     result: &anyhow::Result<RepackOutcome>,
-) -> anyhow::Result<String> {
+) -> serde_json::Result<String> {
     let msg = Message::new(src, result);
-    serde_json::to_string(&msg).map_err(anyhow::Error::from)
+    serde_json::to_string(&msg)
 }
 
 #[allow(non_snake_case)]