index: move static functions from Index to IndexFile and delete it

The Index struct no longer has any state, so it's not needed.

lib/src/index.rs

@@ -908,6 +908,29 @@ impl IndexEntry<'_> {
 }
 
 impl IndexFile {
+    pub fn init(dir: PathBuf) {
+        std::fs::create_dir(dir.join("operations")).unwrap();
+    }
+
+    pub fn reinit(dir: PathBuf) {
+        std::fs::remove_dir_all(dir.join("operations")).unwrap();
+        IndexFile::init(dir);
+    }
+
+    pub fn load(repo: &ReadonlyRepo, dir: PathBuf, op_id: OperationId) -> Arc<IndexFile> {
+        let op_id_hex = op_id.hex();
+        let op_id_file = dir.join("operations").join(&op_id_hex);
+        let index_file = if op_id_file.exists() {
+            let op_id = OperationId(hex::decode(op_id_hex).unwrap());
+            IndexFile::load_at_operation(&dir, repo.store().hash_length(), &op_id).unwrap()
+        } else {
+            let op = repo.view().get_operation(&op_id).unwrap();
+            IndexFile::index(repo.store(), &dir, &op).unwrap()
+        };
+
+        Arc::new(index_file)
+    }
+
     fn load_from(
         file: &mut dyn Read,
         dir: &Path,
@@ -1103,33 +1126,6 @@ impl IndexFile {
     }
 }
 
-pub struct Index;
-
-impl Index {
-    pub fn init(dir: PathBuf) {
-        std::fs::create_dir(dir.join("operations")).unwrap();
-    }
-
-    pub fn reinit(dir: PathBuf) {
-        std::fs::remove_dir_all(dir.join("operations")).unwrap();
-        Index::init(dir);
-    }
-
-    pub fn load(repo: &ReadonlyRepo, dir: PathBuf, op_id: OperationId) -> Arc<IndexFile> {
-        let op_id_hex = op_id.hex();
-        let op_id_file = dir.join("operations").join(&op_id_hex);
-        let index_file = if op_id_file.exists() {
-            let op_id = OperationId(hex::decode(op_id_hex).unwrap());
-            IndexFile::load_at_operation(&dir, repo.store().hash_length(), &op_id).unwrap()
-        } else {
-            let op = repo.view().get_operation(&op_id).unwrap();
-            IndexFile::index(repo.store(), &dir, &op).unwrap()
-        };
-
-        Arc::new(index_file)
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

lib/src/repo.rs

@@ -24,7 +24,7 @@ use thiserror::Error;
 use crate::commit_builder::{new_change_id, signature};
 use crate::evolution::{Evolution, ReadonlyEvolution};
 use crate::git_store::GitStore;
-use crate::index::{Index, IndexFile};
+use crate::index::IndexFile;
 use crate::local_store::LocalStore;
 use crate::operation::Operation;
 use crate::settings::{RepoSettings, UserSettings};
@@ -155,7 +155,7 @@ impl ReadonlyRepo {
         let static_lifetime_repo: &'static ReadonlyRepo = unsafe { std::mem::transmute(repo_ref) };
 
         fs::create_dir(repo_path.join("index")).unwrap();
-        Index::init(repo_path.join("index"));
+        IndexFile::init(repo_path.join("index"));
 
         let evolution = ReadonlyEvolution::new(static_lifetime_repo);
 
@@ -221,13 +221,13 @@ impl ReadonlyRepo {
         let mut locked_index = self.index.lock().unwrap();
         if locked_index.is_none() {
             let op_id = self.view.base_op_head_id().clone();
-            locked_index.replace(Index::load(self, self.repo_path.join("index"), op_id));
+            locked_index.replace(IndexFile::load(self, self.repo_path.join("index"), op_id));
         }
         locked_index.as_ref().unwrap().clone()
     }
 
     pub fn reindex(&mut self) -> Arc<IndexFile> {
-        Index::reinit(self.repo_path.join("index"));
+        IndexFile::reinit(self.repo_path.join("index"));
         {
             let mut locked_index = self.index.lock().unwrap();
             locked_index.take();