refactor: have per-module error enums

This means that a function that parses step bindings can't return an
error that the document is missing a title. Such an error return would
be nonsensical, and we use the Rust type system to prevent it, at a
small cost of being a bit verbose.

Additional benefit is that the library portion of Obnam doesn't return
anyhow::Result values anymore.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cmd/get_chunk.rs b/src/cmd/get_chunk.rs
index bf653ff..c1d7590 100644
--- a/src/cmd/get_chunk.rs
+++ b/src/cmd/get_chunk.rs
@@ -1,9 +1,10 @@
 use crate::chunkid::ChunkId;
 use crate::client::BackupClient;
 use crate::client::ClientConfig;
+use crate::error::ObnamError;
 use std::io::{stdout, Write};
 
-pub fn get_chunk(config: &ClientConfig, chunk_id: &str) -> anyhow::Result<()> {
+pub fn get_chunk(config: &ClientConfig, chunk_id: &str) -> Result<(), ObnamError> {
     let client = BackupClient::new(&config.server_url)?;
     let chunk_id: ChunkId = chunk_id.parse().unwrap();
     let chunk = client.fetch_chunk(&chunk_id)?;