Add a way to get a list of changed items in the worktree.

Author: Byron

Cargo.lock

@@ -7,6 +7,8 @@ bstr = "1.11.1"
 # Add the `tracing` or `tracing-detail` features to see more of gitoxide in the logs. Useful to see which programs it invokes.
 gix = { git = "https://github.com/GitoxideLabs/gitoxide", branch = "main", default-features = false, features = [
 ] }
+gix-testtools = "0.15.0"
+insta = "1.41.1"
 git2 = { version = "0.20.0", features = [
     "vendored-openssl",
     "vendored-libgit2",

Cargo.toml

@@ -17,6 +17,7 @@ but-core.workspace = true
 but-workspace.workspace = true
 
 clap = { version = "4.5.23", features = ["derive", "env"] }
+gix.workspace = true
 anyhow.workspace = true
 tracing-forest = { version = "0.1.6" }
 tracing-subscriber.workspace = true

crates/but-cli/Cargo.toml

@@ -5,16 +5,22 @@ pub fn project_from_path(path: PathBuf) -> anyhow::Result<Project> {
     Project::from_path(&path)
 }
 
+pub fn project_repo(path: PathBuf) -> anyhow::Result<gix::Repository> {
+    let project = project_from_path(path)?;
+    Ok(gix::open(project.worktree_path())?)
+}
+
 fn debug_print(this: impl std::fmt::Debug) -> anyhow::Result<()> {
     println!("{:#?}", this);
     Ok(())
 }
 
 pub mod status {
-    use crate::command::debug_print;
+    use crate::command::{debug_print, project_repo};
+    use std::path::PathBuf;
 
-    pub fn doit() -> anyhow::Result<()> {
-        debug_print("call into but-core")
+    pub fn doit(current_dir: PathBuf) -> anyhow::Result<()> {
+        debug_print(but_core::worktree::changes(&project_repo(current_dir)?)?)
     }
 }
 

crates/but-cli/src/command/mod.rs

@@ -15,7 +15,7 @@ fn main() -> Result<()> {
     let _op_span = tracing::info_span!("cli-op").entered();
 
     match args.cmd {
-        args::Subcommands::Status => command::status::doit(),
+        args::Subcommands::Status => command::status::doit(args.current_dir),
         args::Subcommands::Stacks => command::stacks::list(args.current_dir),
     }
 }

crates/but-cli/src/main.rs

@@ -12,6 +12,8 @@ doctest = false
 serde = { workspace = true, features = ["std"] }
 bstr.workspace = true
 anyhow = "1.0.95"
-gix = { workspace = true, features = ["dirwalk", "credentials", "parallel"] }
-walkdir = "2.5.0"
-toml.workspace = true
+gix = { workspace = true, features = ["dirwalk", "credentials", "parallel", "serde", "status"] }
+
+[dev-dependencies]
+gix-testtools.workspace = true
+insta.workspace = true

crates/but-core/Cargo.toml

@@ -5,25 +5,49 @@
 //!
 //! ### House-~~Rules~~ Guidance
 //!
-//! * Try hard to do write all the 'right' tests
+//! * **Try hard to do write all the 'right' tests**
 //!    - Tests should challenge the implementation, try hard to break it.
 //!    - capture *all* business requirements
 //!    - Try to avoid doing read-only filesystem fixtures with `tempdir`, instead use `gitbutler-testtools::readonly`.
-//! * minimal dependencies
-//!    - both for the crate and for parameters of functions as well.
+//! * **minimal dependencies**
+//!    - both for the *crate* and for *parameters* of functions as well.
 //!         - i.e. try to avoid 'God' structures so the function only has access to what it needs to.
-//! * The filesystem is `Sync` but we don't have atomic operations
+//! * **The filesystem is `Sync` but we don't have atomic operations**
 //!    - Let's be very careful about changes to the filesystem, must at least be on the level of Git which means `.lock` files instead of direct writes.
 //!    - If only one part of the application is supposed to change the worktree, let's protect the Application from itself by using `gitbutler::access` just like we do now.
-//! * Make it work, make it work right, and if time and profiler permits, make it work fast.
-//! * All of the above can and should be scrutinized and is there is no hard rules.
+//! * **Implement `Serialize` on utility types to facilitate transfer to the frontend**
+//!     - But don't make bigger types frontend-specific. If that is needed, create a new type in the frontend-crate that uses frontend types.
+//!     - `BString` has a `BStringForFrontend` counterpart.
+//!     - `gix::ObjectId` has a `with = gitbutler_serde::object_id` serialization module.
+//! * **Make it work, make it work right, and if time and profiler permits, make it work fast**.
+//! * **All of the above can and should be scrutinized and is there is no hard rules.**
+//!
+//! ### Terminology
+//!
+//! * **Worktree**
+//!     - A git worktree, i.e. the checkout of a tree that makes the tree accessible on disk.
+//! * **Workspace**
+//!     - A GitButler concept of the combination of one or more branches into one worktree. This allows
+//!       multiple branches to be perceived in one worktree, by merging multiple branches together.
+//!
+
+use bstr::BString;
 
 /// Functions related to a Git worktree, i.e. the files checked out from a repository.
-pub mod worktree {
-    use std::path::Path;
+pub mod worktree;
 
-    /// Return a list of items that live underneath `worktree_root` that changed and thus can become part of a commit.
-    pub fn committable_entries(_worktree_root: &Path) -> anyhow::Result<()> {
-        todo!()
-    }
+/// An entry in the worktree that changed and thus is eligible to being committed.
+///
+/// It either lives (or lived) in the in `.git/index`, or in the `worktree`.
+///
+/// ### Note
+///
+/// For simplicity, copy-tracking is not representable right now, but `copy: bool` could be added
+/// if needed.
+#[derive(Debug, Clone)]
+pub struct WorktreeChange {
+    /// The *relative* path in the worktree where the entry can be found.
+    pub path: BString,
+    /// The specific information about this change.
+    pub status: worktree::Status,
 }