chore: init hls-server cargo project

[dastarruer]

Summary

• Add fenix to flake.nix inputs
• Add rust packages to flake.nix devshell
• Create hls-server cargo project with cargo init

Summary by CodeRabbit

• Chores

  • Development environment updated to use an alternative Rust toolchain source and public cache, adding a full Rust toolchain, rust-analyzer nightly, and Rust-focused pre-commit checks (formatting, linting, and TOML validation).
  • Build output now ignored by version control.

• New Features

  • New server component initialized with a Cargo project, toolchain pinning, and a simple runnable "Hello, world!" entrypoint.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2a011835-57a9-4cfe-b13d-9603628e1880

📥 Commits

Reviewing files that changed from the base of the PR and between 5fa9577 and 353693e.

⛔ Files ignored due to path filters (2)

• flake.lock is excluded by !**/*.lock
• hls-server/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• flake.nix
• hls-server/.gitignore
• hls-server/Cargo.toml
• hls-server/rust-toolchain.toml
• hls-server/src/main.rs

📝 Walkthrough

Walkthrough

Adds a new Rust workspace crate hls-server with toolchain pinning and gitignore, and updates the Nix flake to use the Fenix input, configure binary caches, expose a Fenix Rust toolchain in devShells, and enable Rust-focused pre-commit hooks.

Changes

Cohort / File(s)	Summary
Nix flake & inputs flake.nix	Added nixConfig with extra-substituters and extra-trusted-public-keys; introduced fenix flake input and adjusted package initialization to use the Fenix overlay.
Dev shell & Rust tooling flake.nix (devShells...)*	Extended devShells.${system}.default to include Fenix-provided Rust components (cargo, clippy, rust-src, rustc, rustfmt) and rust-analyzer-nightly.
Pre-commit hooks flake.nix (pre-commit-check.hooks)*	Enabled/added Rust hooks: clippy (uses pkgs.fenix.complete, all features, deny warnings, manifest path), rustfmt (check mode, manifest path), plus check-toml and taplo.
New Rust project files hls-server/Cargo.toml, hls-server/src/main.rs, hls-server/rust-toolchain.toml, hls-server/.gitignore	Added hls-server Cargo manifest (edition 2024), simple main() printing "Hello, world!", pinned toolchain 1.85.0 with components, and .gitignore entry for target/.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐇 I hopped into the flake and found a shiny key,
A Fenix flame to warm my nightly tree.
A tiny server sprang with "Hello, world!"—so neat,
Toolchains lined up tidy, clippy on its feet.
Hop, code, compile—this burrow smells like tea.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main change: initializing a new Cargo project for hls-server. This aligns with the primary objective of creating an hls-server Cargo project and is concise and specific.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/init-cargo-project

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[dastarruer]

@CodeRabbit review

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✅ Actions performed

Review triggered.

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@flake.nix`:
- Around line 138-146: Inside the with pkgs; block you have redundant pkgs.
prefixes and an unintended nightly toolchain: replace
pkgs.fenix.complete.withComponents [...] with fenix.complete.withComponents
[...] and change pkgs.rust-analyzer-nightly to rust-analyzer-nightly; if you
intended a stable reproducible dev environment, switch fenix.complete to
fenix.stable.withComponents [...] (or fenix.latest) instead of the nightly
toolchain, and optionally consider adding "rust-analyzer" to the withComponents
list rather than pulling rust-analyzer-nightly separately.

In `@hls-server/Cargo.toml`:
- Line 4: The crate sets edition = "2024" which requires rustc >= 1.85 (MSRV),
but this requirement is not documented; add a rust-toolchain.toml at the crate
root pinning the toolchain to 1.85 or newer (e.g., "channel = 1.85") or
alternatively add an explicit MSRV note to the crate README/CONTRIBUTING stating
"Requires rustc >= 1.85" so contributors/CI outside the Nix devshell won't get a
confusing edition error; ensure the new rust-toolchain.toml is committed
alongside the Cargo.toml change.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8abcd80f-2458-4e47-a330-a0083da728a4

📥 Commits

Reviewing files that changed from the base of the PR and between 926846e and 5663573.

⛔ Files ignored due to path filters (2)

• flake.lock is excluded by !**/*.lock
• hls-server/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• flake.nix
• hls-server/.gitignore
• hls-server/Cargo.toml
• hls-server/src/main.rs

[coderabbitai]

Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@flake.nix`:
- Around line 175-182: The devshell is installing a nightly toolchain via
fenix.complete.withComponents and rust-analyzer-nightly while
hls-server/rust-toolchain.toml pins stable 1.85.0; update the flake to use the
same pinned channel by replacing fenix.complete.withComponents (and
rust-analyzer-nightly) with a stable-based provider such as
fenix.fromToolchainFile pointing at ./hls-server/rust-toolchain.toml or
fenix.stable.withComponents [...], ensuring the symbols
fenix.complete.withComponents and rust-analyzer-nightly are removed/adjusted and
fenix.fromToolchainFile or fenix.stable.withComponents is used so the devshell
toolchain matches rust-toolchain.toml.
- Around line 123-154: The clippy and rustfmt blocks currently use
pkgs.fenix.complete (nightly) causing a toolchain mismatch with
hls-server/rust-toolchain.toml (stable 1.85.0); update both the clippy and
rustfmt definitions (the blocks named clippy and rustfmt that set
packageOverrides and settings) to use fenix.fromToolchainFile { file =
./hls-server/rust-toolchain.toml; sha256 = "..." } (use lib.fakeSha256
initially) instead of pkgs.fenix.complete so the Nix-provided
cargo/clippy/rustfmt match the pinned channel, and apply the same change to the
devShell usage of fenix.complete.withComponents to ensure all pre-commit hooks
and the devShell use the fromToolchainFile toolchain.

In `@hls-server/Cargo.toml`:
- Around line 1-4: Add the package.rust-version field to Cargo.toml to declare
the minimum supported Rust toolchain (MSRV); update the [package] section by
adding a rust-version = "x.y" entry (using the same minor/patch as your
rust-toolchain.toml toolchain) so Cargo will enforce the MSRV during dependency
resolution and CI outside the devshell. Reference the Cargo.toml [package] block
and the rust-version field name when making the change.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3407be03-34c6-470b-a30a-b3866055edf0

📥 Commits

Reviewing files that changed from the base of the PR and between 5663573 and 5fa9577.

⛔ Files ignored due to path filters (2)

• flake.lock is excluded by !**/*.lock
• hls-server/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• flake.nix
• hls-server/.gitignore
• hls-server/Cargo.toml
• hls-server/rust-toolchain.toml
• hls-server/src/main.rs