1 files changed, 64 insertions, 0 deletions
diff --git a/pre_commit/languages/swift.py b/pre_commit/languages/swift.py
new file mode 100644
index 0000000..66aadc8
--- /dev/null
+++ b/pre_commit/languages/swift.py
@@ -0,0 +1,64 @@
+import contextlib
+import os
+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 cmd_output_b
+
+ENVIRONMENT_DIR = 'swift_env'
+get_default_version = helpers.basic_get_default_version
+healthy = helpers.basic_healthy
+BUILD_DIR = '.build'
+BUILD_CONFIG = 'release'
+
+
+def get_env_patch(venv: str) -> PatchesT:  # pragma: win32 no cover
+    bin_path = os.path.join(venv, BUILD_DIR, BUILD_CONFIG)
+    return (('PATH', (bin_path, os.pathsep, Var('PATH'))),)
+
+
+@contextlib.contextmanager  # pragma: win32 no cover
+def in_env(prefix: Prefix) -> Generator[None, None, None]:
+    envdir = prefix.path(
+        helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
+    )
+    with envcontext(get_env_patch(envdir)):
+        yield
+
+
+def install_environment(
+        prefix: Prefix, version: str, additional_dependencies: Sequence[str],
+) -> None:  # pragma: win32 no cover
+    helpers.assert_version_default('swift', version)
+    helpers.assert_no_additional_deps('swift', additional_dependencies)
+    directory = prefix.path(
+        helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
+    )
+
+    # Build the swift package
+    with clean_path_on_failure(directory):
+        os.mkdir(directory)
+        cmd_output_b(
+            'swift', 'build',
+            '-C', prefix.prefix_dir,
+            '-c', BUILD_CONFIG,
+            '--build-path', os.path.join(directory, BUILD_DIR),
+        )
+
+
+def run_hook(
+        hook: Hook,
+        file_args: Sequence[str],
+        color: bool,
+) -> Tuple[int, bytes]:  # pragma: win32 no cover
+    with in_env(hook.prefix):
+        return helpers.run_xargs(hook, hook.cmd, file_args, color=color)