use StorageConfig instead of ReplicaConfig

taskchampion/src/storage/config.rs

@@ -0,0 +1,23 @@
+use super::{InMemoryStorage, KVStorage, Storage};
+use failure::Fallible;
+use std::path::PathBuf;
+
+/// The configuration required for a replica's storage.
+pub enum StorageConfig {
+    /// Store the data on disk.  This is the common choice.
+    OnDisk {
+        /// Path containing the task DB.
+        taskdb_dir: PathBuf,
+    },
+    /// Store the data in memory.  This is only useful for testing.
+    InMemory,
+}
+
+impl StorageConfig {
+    pub fn into_storage(self) -> Fallible<Box<dyn Storage>> {
+        Ok(match self {
+            StorageConfig::OnDisk { taskdb_dir } => Box::new(KVStorage::new(taskdb_dir)?),
+            StorageConfig::InMemory => Box::new(InMemoryStorage::new()),
+        })
+    }
+}

taskchampion/src/storage/mod.rs

@@ -2,11 +2,13 @@ use failure::Fallible;
 use std::collections::HashMap;
 use uuid::Uuid;
 
+mod config;
 mod inmemory;
 mod kv;
 mod operation;
 
 pub use self::kv::KVStorage;
+pub use config::StorageConfig;
 pub use inmemory::InMemoryStorage;
 
 pub use operation::Operation;