add support for dart as a hook language

azure-pipelines.yml

@@ -26,9 +26,9 @@ jobs:
         Write-Host "##vso[task.prependpath]C:\Strawberry\perl\site\bin"
         Write-Host "##vso[task.prependpath]C:\Strawberry\c\bin"
       displayName: Add strawberry perl to PATH
-    - task: PowerShell@2
-      inputs:
-        filePath: "testing/get-r.ps1"
+    - bash: testing/get-dart.sh
+      displayName: install dart
+    - powershell: testing/get-r.ps1
       displayName: install R
 - template: job--python-tox.yml@asottile
   parameters:
@@ -38,13 +38,11 @@ jobs:
     pre_test:
     - task: UseRubyVersion@0
     - template: step--git-install.yml
-    - bash: |
-        testing/get-coursier.sh
-        echo '##vso[task.prependpath]/tmp/coursier'
+    - bash: testing/get-coursier.sh
       displayName: install coursier
-    - bash: |
-        testing/get-swift.sh
-        echo '##vso[task.prependpath]/tmp/swift/usr/bin'
+    - bash: testing/get-dart.sh
+      displayName: install dart
+    - bash: testing/get-swift.sh
       displayName: install swift
     - bash: testing/get-r.sh
       displayName: install R
@@ -54,13 +52,11 @@ jobs:
     os: linux
     pre_test:
     - task: UseRubyVersion@0
-    - bash: |
-        testing/get-coursier.sh
-        echo '##vso[task.prependpath]/tmp/coursier'
+    - bash: testing/get-coursier.sh
       displayName: install coursier
-    - bash: |
-        testing/get-swift.sh
-        echo '##vso[task.prependpath]/tmp/swift/usr/bin'
+    - bash: testing/get-dart.sh
+      displayName: install dart
+    - bash: testing/get-swift.sh
       displayName: install swift
     - bash: testing/get-r.sh
       displayName: install R

pre_commit/languages/all.py

@@ -7,6 +7,7 @@
 from pre_commit.hook import Hook
 from pre_commit.languages import conda
 from pre_commit.languages import coursier
+from pre_commit.languages import dart
 from pre_commit.languages import docker
 from pre_commit.languages import docker_image
 from pre_commit.languages import dotnet
@@ -44,6 +45,7 @@ class Language(NamedTuple):
     # BEGIN GENERATED (testing/gen-languages-all)
     'conda': Language(name='conda', ENVIRONMENT_DIR=conda.ENVIRONMENT_DIR, get_default_version=conda.get_default_version, healthy=conda.healthy, install_environment=conda.install_environment, run_hook=conda.run_hook),  # noqa: E501
     'coursier': Language(name='coursier', ENVIRONMENT_DIR=coursier.ENVIRONMENT_DIR, get_default_version=coursier.get_default_version, healthy=coursier.healthy, install_environment=coursier.install_environment, run_hook=coursier.run_hook),  # noqa: E501
+    'dart': Language(name='dart', ENVIRONMENT_DIR=dart.ENVIRONMENT_DIR, get_default_version=dart.get_default_version, healthy=dart.healthy, install_environment=dart.install_environment, run_hook=dart.run_hook),  # noqa: E501
     'docker': Language(name='docker', ENVIRONMENT_DIR=docker.ENVIRONMENT_DIR, get_default_version=docker.get_default_version, healthy=docker.healthy, install_environment=docker.install_environment, run_hook=docker.run_hook),  # noqa: E501
     'docker_image': Language(name='docker_image', ENVIRONMENT_DIR=docker_image.ENVIRONMENT_DIR, get_default_version=docker_image.get_default_version, healthy=docker_image.healthy, install_environment=docker_image.install_environment, run_hook=docker_image.run_hook),  # noqa: E501
     'dotnet': Language(name='dotnet', ENVIRONMENT_DIR=dotnet.ENVIRONMENT_DIR, get_default_version=dotnet.get_default_version, healthy=dotnet.healthy, install_environment=dotnet.install_environment, run_hook=dotnet.run_hook),  # noqa: E501

pre_commit/languages/dart.py

@@ -0,0 +1,109 @@
+import contextlib
+import os.path
+import shutil
+import tempfile
+from typing import Generator
+from typing import Sequence
+from typing import Tuple
+
+import pre_commit.constants as C
+from pre_commit.envcontext import envcontext
+from pre_commit.envcontext import PatchesT
+from pre_commit.envcontext import Var
+from pre_commit.hook import Hook
+from pre_commit.languages import helpers
+from pre_commit.prefix import Prefix
+from pre_commit.util import clean_path_on_failure
+from pre_commit.util import win_exe
+from pre_commit.util import yaml_load
+
+ENVIRONMENT_DIR = 'dartenv'
+
+get_default_version = helpers.basic_get_default_version
+healthy = helpers.basic_healthy
+
+
+def get_env_patch(venv: str) -> PatchesT:
+    return (
+        ('PATH', (os.path.join(venv, 'bin'), os.pathsep, Var('PATH'))),
+    )
+
+
+@contextlib.contextmanager
+def in_env(prefix: Prefix) -> Generator[None, None, None]:
+    directory = helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT)
+    envdir = prefix.path(directory)
+    with envcontext(get_env_patch(envdir)):
+        yield
+
+
+def install_environment(
+        prefix: Prefix,
+        version: str,
+        additional_dependencies: Sequence[str],
+) -> None:
+    helpers.assert_version_default('dart', version)
+
+    envdir = prefix.path(helpers.environment_dir(ENVIRONMENT_DIR, version))
+    bin_dir = os.path.join(envdir, 'bin')
+
+    def _install_dir(prefix_p: Prefix, pub_cache: str) -> None:
+        dart_env = {**os.environ, 'PUB_CACHE': pub_cache}
+
+        with open(prefix_p.path('pubspec.yaml')) as f:
+            pubspec_contents = yaml_load(f)
+
+        helpers.run_setup_cmd(prefix_p, ('dart', 'pub', 'get'), env=dart_env)
+
+        for executable in pubspec_contents['executables']:
+            helpers.run_setup_cmd(
+                prefix_p,
+                (
+                    'dart', 'compile', 'exe',
+                    '--output', os.path.join(bin_dir, win_exe(executable)),
+                    prefix_p.path('bin', f'{executable}.dart'),
+                ),
+                env=dart_env,
+            )
+
+    with clean_path_on_failure(envdir):
+        os.makedirs(bin_dir)
+
+        with tempfile.TemporaryDirectory() as tmp:
+            _install_dir(prefix, tmp)
+
+        for dep_s in additional_dependencies:
+            with tempfile.TemporaryDirectory() as dep_tmp:
+                dep, _, version = dep_s.partition(':')
+                if version:
+                    dep_cmd: Tuple[str, ...] = (dep, '--version', version)
+                else:
+                    dep_cmd = (dep,)
+
+                helpers.run_setup_cmd(
+                    prefix,
+                    ('dart', 'pub', 'cache', 'add', *dep_cmd),
+                    env={**os.environ, 'PUB_CACHE': dep_tmp},
+                )
+
+                # try and find the 'pubspec.yaml' that just got added
+                for root, _, filenames in os.walk(dep_tmp):
+                    if 'pubspec.yaml' in filenames:
+                        with tempfile.TemporaryDirectory() as copied:
+                            pkg = os.path.join(copied, 'pkg')
+                            shutil.copytree(root, pkg)
+                            _install_dir(Prefix(pkg), dep_tmp)
+                        break
+                else:
+                    raise AssertionError(
+                        f'could not find pubspec.yaml for {dep_s}',
+                    )
+
+
+def run_hook(
+        hook: Hook,
+        file_args: Sequence[str],
+        color: bool,
+) -> Tuple[int, bytes]:
+    with in_env(hook.prefix):
+        return helpers.run_xargs(hook, hook.cmd, file_args, color=color)

pre_commit/languages/helpers.py

@@ -48,8 +48,8 @@ def exe_exists(exe: str) -> bool:
     )
 
 
-def run_setup_cmd(prefix: Prefix, cmd: Tuple[str, ...]) -> None:
-    cmd_output_b(*cmd, cwd=prefix.prefix_dir)
+def run_setup_cmd(prefix: Prefix, cmd: Tuple[str, ...], **kwargs: Any) -> None:
+    cmd_output_b(*cmd, cwd=prefix.prefix_dir, **kwargs)
 
 
 @overload

pre_commit/languages/python.py

@@ -21,6 +21,7 @@
 from pre_commit.util import clean_path_on_failure
 from pre_commit.util import cmd_output
 from pre_commit.util import cmd_output_b
+from pre_commit.util import win_exe
 
 ENVIRONMENT_DIR = 'py_env'
 
@@ -172,7 +173,7 @@ def healthy(prefix: Prefix, language_version: str) -> bool:
     if not os.path.exists(pyvenv_cfg):
         return False
 
-    exe_name = 'python.exe' if sys.platform == 'win32' else 'python'
+    exe_name = win_exe('python')
     py_exe = prefix.path(bin_dir(envdir), exe_name)
     cfg = _read_pyvenv_cfg(pyvenv_cfg)
 

pre_commit/resources/empty_template_pubspec.yaml

@@ -0,0 +1,4 @@
+name: pre_commit_empty_pubspec
+environment:
+  sdk: '>=2.10.0'
+executables: {}

pre_commit/store.py

@@ -189,7 +189,7 @@ def _git_cmd(*args: str) -> None:
     LOCAL_RESOURCES = (
         'Cargo.toml', 'main.go', 'go.mod', 'main.rs', '.npmignore',
         'package.json', 'pre_commit_placeholder_package.gemspec', 'setup.py',
-        'environment.yml', 'Makefile.PL',
+        'environment.yml', 'Makefile.PL', 'pubspec.yaml',
         'renv.lock', 'renv/activate.R', 'renv/LICENSE.renv',
     )
 

pre_commit/util.py

@@ -268,3 +268,7 @@ def handle_remove_readonly(
 def parse_version(s: str) -> Tuple[int, ...]:
     """poor man's version comparison"""
     return tuple(int(p) for p in s.split('.'))
+
+
+def win_exe(s: str) -> str:
+    return s if sys.platform != 'win32' else f'{s}.exe'

testing/gen-languages-all

@@ -2,9 +2,9 @@
 import sys
 
 LANGUAGES = [
-    'conda', 'coursier', 'docker', 'docker_image', 'dotnet', 'fail', 'golang',
-    'node', 'perl', 'pygrep', 'python', 'r', 'ruby', 'rust', 'script',
-    'swift', 'system',
+    'conda', 'coursier', 'dart', 'docker', 'docker_image', 'dotnet', 'fail',
+    'golang', 'node', 'perl', 'pygrep', 'python', 'r', 'ruby', 'rust',
+    'script', 'swift', 'system',
 ]
 FIELDS = [
     'ENVIRONMENT_DIR', 'get_default_version', 'healthy', 'install_environment',

testing/get-coursier.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # This is a script used in CI to install coursier
-set -euxo pipefail
+set -euo pipefail
 
 COURSIER_URL="https://github.com/coursier/coursier/releases/download/v2.0.0/cs-x86_64-pc-linux"
 COURSIER_HASH="e2e838b75bc71b16bcb77ce951ad65660c89bda7957c79a0628ec7146d35122f"
@@ -11,3 +11,5 @@ rm -f "$ARTIFACT"
 curl --location --silent --output "$ARTIFACT" "$COURSIER_URL"
 echo "$COURSIER_HASH  $ARTIFACT" | sha256sum --check
 chmod ugo+x /tmp/coursier/cs
+
+echo '##vso[task.prependpath]/tmp/coursier'

testing/get-dart.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+VERSION=2.13.4
+
+if [ "$OSTYPE" = msys ]; then
+    URL="https://storage.googleapis.com/dart-archive/channels/stable/release/${VERSION}/sdk/dartsdk-windows-x64-release.zip"
+    echo "##vso[task.prependpath]$(cygpath -w /tmp/dart-sdk/bin)"
+else
+    URL="https://storage.googleapis.com/dart-archive/channels/stable/release/${VERSION}/sdk/dartsdk-linux-x64-release.zip"
+    echo '##vso[task.prependpath]/tmp/dart-sdk/bin'
+fi
+
+curl --silent --location --output /tmp/dart.zip "$URL"
+
+unzip -q -d /tmp /tmp/dart.zip
+rm /tmp/dart.zip

testing/get-swift.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # This is a script used in CI to install swift
-set -euxo pipefail
+set -euo pipefail
 
 . /etc/lsb-release
 if [ "$DISTRIB_CODENAME" = "bionic" ]; then
@@ -25,3 +25,5 @@ fi
 
 mkdir -p /tmp/swift
 tar -xf "$TGZ" --strip 1 --directory /tmp/swift
+
+echo '##vso[task.prependpath]/tmp/swift/usr/bin'

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

@@ -0,0 +1,4 @@
+-   id: hello-world-dart
+    name: hello world dart
+    entry: hello-world-dart
+    language: dart

testing/resources/dart_repo/bin/hello-world-dart.dart

@@ -0,0 +1,6 @@
+import 'package:ansicolor/ansicolor.dart';
+
+void main() {
+    AnsiPen pen = new AnsiPen()..red();
+    print("hello hello " + pen("world"));
+}

testing/resources/dart_repo/pubspec.yaml

@@ -0,0 +1,10 @@
+environment:
+  sdk: '>=2.10.0 <3.0.0'
+
+name: hello_world_dart
+
+executables:
+    hello-world-dart:
+
+dependencies:
+  ansicolor: ^2.0.1

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

@@ -1,4 +1,4 @@
--   id: dotnet example hook
+-   id: dotnet-example-hook
     name: dotnet example hook
     entry: testeroni
     language: dotnet

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

@@ -1,4 +1,4 @@
--   id: dotnet example hook
+-   id: dotnet-example-hook
     name: dotnet example hook
     entry: testeroni
     language: dotnet

tests/languages/python_test.py

@@ -9,6 +9,7 @@
 from pre_commit.languages import python
 from pre_commit.prefix import Prefix
 from pre_commit.util import make_executable
+from pre_commit.util import win_exe
 
 
 def test_read_pyvenv_cfg(tmpdir):
@@ -112,7 +113,7 @@ def test_unhealthy_python_goes_missing(python_dir):
 
     python.install_environment(prefix, C.DEFAULT, ())
 
-    exe_name = 'python' if sys.platform != 'win32' else 'python.exe'
+    exe_name = win_exe('python')
     py_exe = prefix.path(python.bin_dir('py_env-default'), exe_name)
     os.remove(py_exe)
 
@@ -158,7 +159,7 @@ def test_unhealthy_then_replaced(python_dir):
     python.install_environment(prefix, C.DEFAULT, ())
 
     # simulate an exe which returns an old version
-    exe_name = 'python.exe' if sys.platform == 'win32' else 'python'
+    exe_name = win_exe('python')
     py_exe = prefix.path(python.bin_dir('py_env-default'), exe_name)
     os.rename(py_exe, f'{py_exe}.tmp')
 

tests/repository_test.py

@@ -1043,10 +1043,50 @@ def test_local_perl_additional_dependencies(store):
 def test_dotnet_hook(tempdir_factory, store, repo):
     _test_hook_repo(
         tempdir_factory, store, repo,
-        'dotnet example hook', [], b'Hello from dotnet!\n',
+        'dotnet-example-hook', [], b'Hello from dotnet!\n',
     )
 
 
+def test_dart_hook(tempdir_factory, store):
+    _test_hook_repo(
+        tempdir_factory, store, 'dart_repo',
+        'hello-world-dart', [], b'hello hello world\n',
+    )
+
+
+def test_local_dart_additional_dependencies(store):
+    config = {
+        'repo': 'local',
+        'hooks': [{
+            'id': 'local-dart',
+            'name': 'local-dart',
+            'entry': 'hello-world-dart',
+            'language': 'dart',
+            'additional_dependencies': ['hello_world_dart'],
+        }],
+    }
+    hook = _get_hook(config, store, 'local-dart')
+    ret, out = _hook_run(hook, (), color=False)
+    assert (ret, _norm_out(out)) == (0, b'hello hello world\n')
+
+
+def test_local_dart_additional_dependencies_versioned(store):
+    config = {
+        'repo': 'local',
+        'hooks': [{
+            'id': 'local-dart',
+            'name': 'local-dart',
+            'entry': 'secure-random -l 4 -b 16',
+            'language': 'dart',
+            'additional_dependencies': ['encrypt:5.0.0'],
+        }],
+    }
+    hook = _get_hook(config, store, 'local-dart')
+    ret, out = _hook_run(hook, (), color=False)
+    assert ret == 0
+    re_assert.Matches('^[a-f0-9]{8}\r?\n$').assert_matches(out.decode())
+
+
 def test_non_installable_hook_error_for_language_version(store, caplog):
     config = {
         'repo': 'local',