Add tests for Rust

pre_commit/languages/rust.py

@@ -39,6 +39,7 @@ def in_env(prefix):
 def _add_dependencies(cargo_toml_path, additional_dependencies):
     with open(cargo_toml_path, 'r+') as f:
         cargo_toml = toml.load(f)
+        cargo_toml.setdefault('dependencies', {})
         for dep in additional_dependencies:
             name, _, spec = dep.partition(':')
             cargo_toml['dependencies'][name] = spec or '*'
@@ -47,7 +48,7 @@ def _add_dependencies(cargo_toml_path, additional_dependencies):
         f.truncate()
 
 
-def install_environment(prefix, version, additional_deps):
+def install_environment(prefix, version, additional_dependencies):
     helpers.assert_version_default('rust', version)
     directory = prefix.path(
         helpers.environment_dir(ENVIRONMENT_DIR, 'default'),
@@ -63,14 +64,23 @@ def install_environment(prefix, version, additional_deps):
     #
     # Because of this, we allow specifying "cli" dependencies by prefixing
     # with 'cli:'.
-    cli_deps = {dep for dep in additional_deps if dep.startswith('cli:')}
-    lib_deps = set(additional_deps) - cli_deps
+    cli_deps = {
+        dep for dep in additional_dependencies if dep.startswith('cli:')
+    }
+    lib_deps = set(additional_dependencies) - cli_deps
 
     if len(lib_deps) > 0:
         _add_dependencies(prefix.path('Cargo.toml'), lib_deps)
 
     with clean_path_on_failure(directory):
-        packages_to_install = {()} | {(dep[len('cli:'):],) for dep in cli_deps}
+        packages_to_install = {()}
+        for cli_dep in cli_deps:
+            cli_dep = cli_dep[len('cli:'):]
+            package, _, version = cli_dep.partition(':')
+            if version != '':
+                packages_to_install.add((package, '--version', version))
+            else:
+                packages_to_install.add((package,))
 
         for package in packages_to_install:
             cmd_output(

testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,5 @@
+-   id: rust-hook
+    name: rust example hook
+    entry: rust-hello-world
+    language: rust
+    files: ''

testing/resources/rust_hooks_repo/Cargo.lock

@@ -0,0 +1,3 @@
+[[package]]
+name = "rust-hello-world"
+version = "0.1.0"

testing/resources/rust_hooks_repo/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "rust-hello-world"
+version = "0.1.0"

testing/resources/rust_hooks_repo/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("hello world");
+}

tests/repository_test.py

@@ -20,6 +20,7 @@ from pre_commit.languages import node
 from pre_commit.languages import pcre
 from pre_commit.languages import python
 from pre_commit.languages import ruby
+from pre_commit.languages import rust
 from pre_commit.repository import Repository
 from pre_commit.util import cmd_output
 from testing.fixtures import config_with_local_hooks
@@ -282,6 +283,51 @@ def test_golang_hook(tempdir_factory, store):
     )
 
 
+@pytest.mark.integration
+def test_rust_hook(tempdir_factory, store):
+    _test_hook_repo(
+        tempdir_factory, store, 'rust_hooks_repo',
+        'rust-hook', [], b'hello world\n',
+    )
+
+
+@pytest.mark.integration
+@pytest.mark.parametrize('dep', ('cli:shellharden:3.1.0', 'cli:shellharden'))
+def test_additional_rust_cli_dependencies_installed(
+        tempdir_factory, store, dep,
+):
+    path = make_repo(tempdir_factory, 'rust_hooks_repo')
+    config = make_config_from_repo(path)
+    # A small rust package with no dependencies.
+    config['hooks'][0]['additional_dependencies'] = [dep]
+    repo = Repository.create(config, store)
+    repo.require_installed()
+    (prefix, _, _, _), = repo._venvs()
+    binaries = os.listdir(prefix.path(
+        helpers.environment_dir(rust.ENVIRONMENT_DIR, 'default'), 'bin',
+    ))
+    assert 'shellharden' in binaries
+
+
+@pytest.mark.integration
+def test_additional_rust_lib_dependencies_installed(
+        tempdir_factory, store,
+):
+    path = make_repo(tempdir_factory, 'rust_hooks_repo')
+    config = make_config_from_repo(path)
+    # A small rust package with no dependencies.
+    deps = ['shellharden:3.1.0']
+    config['hooks'][0]['additional_dependencies'] = deps
+    repo = Repository.create(config, store)
+    repo.require_installed()
+    (prefix, _, _, _), = repo._venvs()
+    binaries = os.listdir(prefix.path(
+        helpers.environment_dir(rust.ENVIRONMENT_DIR, 'default'), 'bin',
+    ))
+    assert 'rust-hello-world' in binaries
+    assert 'shellharden' not in binaries
+
+
 @pytest.mark.integration
 def test_missing_executable(tempdir_factory, store):
     _test_hook_repo(