How to Type-Check a Specific OpenLogi Crate: Fast Verification for Multi-Crate Workspaces

Run cargo check -p <crate-name> from the repository root to quickly type-check any individual OpenLogi crate without compiling the entire workspace or generating binaries.

OpenLogi organizes its Rust codebase as a multi-crate workspace, with each component residing beneath the crates/ directory. When iterating on specific functionality—whether the openlogi-core protocol library or the openlogi-ui front-end—you need targeted verification that skips the overhead of full workspace compilation while ensuring type safety.

Locate the Target Crate in the Workspace

Each crate in OpenLogi declares its package name in its respective Cargo.toml file under the crates/ directory. The primary library is openlogi-core, defined in crates/openlogi-core/Cargo.toml, while the GPUI-based GUI front-end lives in openlogi-ui at crates/openlogi-ui/Cargo.toml. Other key crates include openlogi-hidpp for HID++ protocol implementation and openlogi-agent for the background service.

To identify the correct name for the -p flag, inspect the package.name field within the target crate’s Cargo.toml.

Execute Fast Type-Checking with Cargo

According to the OpenLogi developer guide in AGENTS.md (lines 62-64), the recommended "fast-path verification step" uses cargo check with the -p (package) flag. This command performs semantic analysis, type-checking, and borrow-checking without producing binaries or running code generation, making it significantly faster than cargo build.

From the repository root, execute:

cargo check -p openlogi-core

This validates openlogi-core and its local dependencies while ignoring unrelated workspace members. The command exits with compilation errors, type mismatches, or dependency resolution failures if present.

Verify Platform-Specific Code Paths

Crates such as openlogi-agent contain #[cfg(target_os = …)] blocks for cross-platform compatibility. Running cargo check on Linux only validates Linux-specific code paths. To verify Windows-specific implementations without switching hosts, specify the target triple:

cargo check -p openlogi-agent --target x86_64-pc-windows-msvc

Integrate Targeted Checks into Your Development Workflow

The OpenLogi development workflow documented in AGENTS.md (lines 77-81) describes this approach as the "inner loop"—rapid iteration on a single crate followed by comprehensive workspace validation once changes stabilize. This methodology appears in automation scripts like xtask/src/commands/release/changelog.rs, which runs cargo check on specific crates before generating release documentation to ensure changelog generation only proceeds when the target code compiles.

For test-driven verification, remember that cargo test -p <crate-name> also type-checks the code it touches before execution, though cargo check remains the fastest pure verification method.

Practical Type-Checking Examples

Use these commands to verify specific OpenLogi components:

# Type-check the core protocol library

cargo check -p openlogi-core

# Type-check the GPUI-based UI front-end

cargo check -p openlogi-ui

# Type-check the HID++ protocol implementation

cargo check -p openlogi-hidpp

# Type-check Windows tray code (requires Windows target or cross-compilation setup)

cargo check -p openlogi-agent --target x86_64-pc-windows-msvc

Summary

• Use cargo check -p <crate-name> to validate a single OpenLogi crate without building the entire workspace.
• Crate names derive from package.name in each crate’s Cargo.toml located under crates/<name>/.
• Performance: Type-checking skips binary generation, offering faster feedback than cargo build.
• Cross-platform validation requires the --target flag to check platform-specific #[cfg] blocks for non-host operating systems.
• Workflow integration follows the "inner loop" pattern described in AGENTS.md for efficient iterative development.

Frequently Asked Questions

What is the difference between cargo check and cargo build when working with OpenLogi?

cargo check performs type-checking, borrow-checking, and macro expansion without producing binaries or optimizing code generation, making it roughly 2-3x faster than cargo build. Use cargo check for rapid verification during development, and reserve cargo build for producing release artifacts or when you need to execute the compiled code.

How do I type-check an OpenLogi crate for a different operating system?

Append the --target flag to your cargo check -p command with the appropriate target triple, such as --target x86_64-pc-windows-msvc for Windows or --target aarch64-unknown-linux-gnu for ARM64 Linux. This forces the compiler to evaluate #[cfg(target_os = "...")] blocks for the specified platform rather than your host system.

Can I run tests on a single OpenLogi crate without checking the entire workspace?

Yes. Use cargo test -p <crate-name> to compile and execute tests for a specific crate only. This command implicitly type-checks the code paths touched by the test suite before running them. For even finer granularity, filter specific tests with cargo test -p <crate-name> --lib <test_name>.

Where does OpenLogi define the crate names used with the -p flag?

Each crate defines its package name in the [package] section of its Cargo.toml file. For example, crates/openlogi-core/Cargo.toml declares name = "openlogi-core", which becomes the identifier for the -p flag. The workspace-wide configuration in the root Cargo.toml lists these crates as members, enabling Cargo to resolve them by name.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}