mirror of
https://github.com/martinvonz/jj.git
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7c8a0a18f9
`ReadonlyRepo::init()` takes callbacks for initializing each kind of backend. We called these things like `op_store_initializer`. I found that confusing because it is not a `OpStoreFactory` (which is for loading an existing backend). This patch tries to clarify that by renaming the arguments and adding types for each kind of callback function.
159 lines
4.6 KiB
Rust
159 lines
4.6 KiB
Rust
// Copyright 2022 The Jujutsu Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::any::Any;
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use std::io::Read;
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use std::path::Path;
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use async_trait::async_trait;
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use jj_cli::cli_util::{CliRunner, CommandError, CommandHelper};
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use jj_cli::ui::Ui;
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use jj_lib::backend::{
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Backend, BackendInitError, BackendLoadError, BackendResult, ChangeId, Commit, CommitId,
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Conflict, ConflictId, FileId, SymlinkId, Tree, TreeId,
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};
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use jj_lib::git_backend::GitBackend;
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use jj_lib::repo::StoreFactories;
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use jj_lib::repo_path::RepoPath;
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use jj_lib::workspace::Workspace;
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#[derive(clap::Parser, Clone, Debug)]
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enum CustomCommands {
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/// Initialize a workspace using the Jit backend
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InitJit,
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}
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fn create_store_factories() -> StoreFactories {
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let mut store_factories = StoreFactories::default();
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// Register the backend so it can be loaded when the repo is loaded. The name
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// must match `Backend::name()`.
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store_factories.add_backend(
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"jit",
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Box::new(|store_path| Ok(Box::new(JitBackend::load(store_path)?))),
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);
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store_factories
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}
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fn run_custom_command(
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_ui: &mut Ui,
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command_helper: &CommandHelper,
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command: CustomCommands,
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) -> Result<(), CommandError> {
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match command {
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CustomCommands::InitJit => {
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let wc_path = command_helper.cwd();
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// Initialize a workspace with the custom backend
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Workspace::init_with_backend(command_helper.settings(), wc_path, &|store_path| {
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Ok(Box::new(JitBackend::init(store_path)?))
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})?;
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Ok(())
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}
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}
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}
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fn main() -> std::process::ExitCode {
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CliRunner::init()
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.set_store_factories(create_store_factories())
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.add_subcommand(run_custom_command)
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.run()
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}
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/// A commit backend that's extremely similar to the Git backend
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#[derive(Debug)]
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struct JitBackend {
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inner: GitBackend,
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}
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impl JitBackend {
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fn init(store_path: &Path) -> Result<Self, BackendInitError> {
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let inner = GitBackend::init_internal(store_path)?;
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Ok(JitBackend { inner })
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}
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fn load(store_path: &Path) -> Result<Self, BackendLoadError> {
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let inner = GitBackend::load(store_path)?;
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Ok(JitBackend { inner })
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}
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}
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#[async_trait]
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impl Backend for JitBackend {
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fn as_any(&self) -> &dyn Any {
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self
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}
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fn name(&self) -> &str {
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"jit"
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}
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fn commit_id_length(&self) -> usize {
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self.inner.commit_id_length()
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}
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fn change_id_length(&self) -> usize {
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self.inner.change_id_length()
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}
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fn root_commit_id(&self) -> &CommitId {
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self.inner.root_commit_id()
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}
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fn root_change_id(&self) -> &ChangeId {
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self.inner.root_change_id()
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}
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fn empty_tree_id(&self) -> &TreeId {
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self.inner.empty_tree_id()
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}
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async fn read_file(&self, path: &RepoPath, id: &FileId) -> BackendResult<Box<dyn Read>> {
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self.inner.read_file(path, id).await
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}
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fn write_file(&self, path: &RepoPath, contents: &mut dyn Read) -> BackendResult<FileId> {
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self.inner.write_file(path, contents)
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}
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async fn read_symlink(&self, path: &RepoPath, id: &SymlinkId) -> BackendResult<String> {
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self.inner.read_symlink(path, id).await
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}
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fn write_symlink(&self, path: &RepoPath, target: &str) -> BackendResult<SymlinkId> {
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self.inner.write_symlink(path, target)
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}
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async fn read_tree(&self, path: &RepoPath, id: &TreeId) -> BackendResult<Tree> {
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self.inner.read_tree(path, id).await
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}
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fn write_tree(&self, path: &RepoPath, contents: &Tree) -> BackendResult<TreeId> {
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self.inner.write_tree(path, contents)
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}
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async fn read_conflict(&self, path: &RepoPath, id: &ConflictId) -> BackendResult<Conflict> {
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self.inner.read_conflict(path, id).await
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}
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fn write_conflict(&self, path: &RepoPath, contents: &Conflict) -> BackendResult<ConflictId> {
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self.inner.write_conflict(path, contents)
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}
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async fn read_commit(&self, id: &CommitId) -> BackendResult<Commit> {
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self.inner.read_commit(id).await
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}
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fn write_commit(&self, contents: Commit) -> BackendResult<(CommitId, Commit)> {
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self.inner.write_commit(contents)
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}
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}
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