feat: add GenerationList

Various part of Obnam will need to deal with lists of generations.
Abstract this.

4 files changed, 7 insertions, 5 deletions

diff --git a/src/client.rs b/src/client.rs
index adca373..ec99134 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -6,6 +6,7 @@ use crate::chunkid::ChunkId;
 use crate::chunkmeta::ChunkMeta;
 use crate::fsentry::{FilesystemEntry, FilesystemKind};
 use crate::generation::FinishedGeneration;
+use crate::genlist::GenerationList;
 use chrono::{DateTime, Local};
 use log::{debug, error, info, trace};
 use reqwest::blocking::Client;
@@ -181,7 +182,7 @@ impl BackupClient {
         Ok(chunk_ids)
     }
 
-    pub fn list_generations(&self) -> anyhow::Result<Vec<FinishedGeneration>> {
+    pub fn list_generations(&self) -> anyhow::Result<GenerationList> {
         let url = format!("{}?generation=true", &self.chunks_url());
         trace!("list_generations: url={:?}", url);
         let req = self.client.get(&url).build()?;
@@ -195,7 +196,7 @@ impl BackupClient {
             .iter()
             .map(|(id, meta)| FinishedGeneration::new(id, meta.ended().map_or("", |s| s)))
             .collect();
-        Ok(finished)
+        Ok(GenerationList::new(finished))
     }
 
     pub fn fetch_chunk(&self, chunk_id: &ChunkId) -> anyhow::Result<DataChunk> {
diff --git a/src/cmd/list.rs b/src/cmd/list.rs
index 70aa0a7..8766e34 100644
--- a/src/cmd/list.rs
+++ b/src/cmd/list.rs
@@ -3,9 +3,8 @@ use crate::client::{BackupClient, ClientConfig};
 pub fn list(config: &ClientConfig) -> anyhow::Result<()> {
     let client = BackupClient::new(&config.server_url)?;
 
-    let mut generations = client.list_generations()?;
-    generations.sort_by_cached_key(|gen| gen.ended().to_string());
-    for finished in generations {
+    let generations = client.list_generations()?;
+    for finished in generations.iter() {
         println!("{} {}", finished.id(), finished.ended());
     }
 
diff --git a/src/generation.rs b/src/generation.rs
index dc9bf0c..5d04a9f 100644
--- a/src/generation.rs
+++ b/src/generation.rs
@@ -158,6 +158,7 @@ mod test {
 /// A finished generation.
 ///
 /// A generation is finished when it's on the server. It can be restored.
+#[derive(Debug, Clone)]
 pub struct FinishedGeneration {
     id: ChunkId,
     ended: String,
diff --git a/src/lib.rs b/src/lib.rs
index 995cdeb..1880758 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,6 +9,7 @@ pub mod cmd;
 pub mod fsentry;
 pub mod fsiter;
 pub mod generation;
+pub mod genlist;
 pub mod index;
 pub mod indexedstore;
 pub mod server;