Add cargo udeps to CI (#733)

* Add cargo udeps

* Ignore useless deps used to recreate grammar automatically

.pre-commit-config.yaml

@@ -28,6 +28,13 @@ repos:
         entry: cargo clippy --all-targets --all -- -D warnings
         pass_filenames: false
 
+      - id: udeps
+        name: udeps
+        language: system
+        files: '\.rs$'
+        entry: cargo +nightly udeps --all-targets
+        pass_filenames: false
+
       - id: test
         name: test
         language: system

.taskcluster.yml

@@ -41,6 +41,8 @@ tasks:
             - "-cx"
             - "curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && python3 get-pip.py &&
                rustup component add clippy rustfmt &&
+               rustup toolchain install nightly &&
+               curl -L https://github.com/est31/cargo-udeps/releases/download/v0.1.25/cargo-udeps-v0.1.25-x86_64-unknown-linux-gnu.tar.gz | tar xz -C /usr/local/cargo/bin --strip-components 2 &&
                git clone --quiet ${repository} &&
                cd rust-code-analysis &&
                git -c advice.detachedHead=false checkout ${head_rev} &&

tree-sitter-mozcpp/Cargo.toml

@@ -28,3 +28,6 @@ cc = "^1.0"
 # This dependency is not used at all for this crate, but it is here so that
 # dependabot can send notifications when there are updates for this grammar
 tree-sitter-cpp = "0.19.0"
+
+[package.metadata.cargo-udeps.ignore]
+build = ["tree-sitter-cpp"]

tree-sitter-mozjs/Cargo.toml

@@ -28,3 +28,6 @@ cc = "^1.0"
 # This dependency is not used at all for this crate, but it is here so that
 # dependabot can send notifications when there are updates for this grammar
 tree-sitter-javascript = "0.19.0"
+
+[package.metadata.cargo-udeps.ignore]
+build = ["tree-sitter-javascript"]