From 0e7a851fb6578eee5812e69bc11772142bc9fb54 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Wed, 30 Dec 2020 15:34:08 +0200
Subject: fix: add missing source files

---
 src/error.rs   |  8 ++++++++
 src/genlist.rs | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 src/error.rs
 create mode 100644 src/genlist.rs

diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..1e750e5
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,8 @@
+use thiserror::Error;
+
+/// Define all the kinds of errors any part of this crate can return.
+#[derive(Debug, Error)]
+pub enum ObnamError {
+    #[error("Can't find backup '{0}'")]
+    UnknownGeneration(String),
+}
diff --git a/src/genlist.rs b/src/genlist.rs
new file mode 100644
index 0000000..10c614e
--- /dev/null
+++ b/src/genlist.rs
@@ -0,0 +1,43 @@
+use crate::chunkid::ChunkId;
+use crate::generation::FinishedGeneration;
+
+pub struct GenerationList {
+    list: Vec<FinishedGeneration>,
+}
+
+impl GenerationList {
+    pub fn new(gens: Vec<FinishedGeneration>) -> Self {
+        let mut list = gens.clone();
+        list.sort_by_cached_key(|gen| gen.ended().to_string());
+        Self { list }
+    }
+
+    pub fn iter(&self) -> impl Iterator<Item = &FinishedGeneration> {
+        self.list.iter()
+    }
+
+    pub fn resolve(&self, genref: &str) -> Option<String> {
+        let gen = if self.list.is_empty() {
+            None
+        } else if genref == "latest" {
+            let i = self.list.len() - 1;
+            Some(self.list[i].clone())
+        } else {
+            let genref: ChunkId = genref.parse().unwrap();
+            let hits: Vec<FinishedGeneration> = self
+                .iter()
+                .filter(|gen| gen.id() == genref)
+                .map(|gen| gen.clone())
+                .collect();
+            if hits.len() == 1 {
+                Some(hits[0].clone())
+            } else {
+                None
+            }
+        };
+        match gen {
+            None => None,
+            Some(gen) => Some(gen.id().to_string()),
+        }
+    }
+}
-- 
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