SwiftPM support

pre_commit/languages/all.py

@@ -6,6 +6,7 @@ from pre_commit.languages import pcre
 from pre_commit.languages import python
 from pre_commit.languages import ruby
 from pre_commit.languages import script
+from pre_commit.languages import swift
 from pre_commit.languages import system
 
 # A language implements the following constant and two functions in its module:
@@ -47,6 +48,7 @@ languages = {
     'python': python,
     'ruby': ruby,
     'script': script,
+    'swift': swift,
     'system': system,
 }
 

pre_commit/languages/swift.py

@@ -0,0 +1,29 @@
+from __future__ import unicode_literals
+
+from pre_commit.languages import helpers
+from pre_commit.util import clean_path_on_failure
+from pre_commit.util import cwd
+from pre_commit.languages import helpers
+from pre_commit.xargs import xargs
+
+ENVIRONMENT_DIR = None
+BUILD_DIR = '.build'
+BUILD_CONFIG = 'release'
+
+def install_environment(
+        repo_cmd_runner,
+        version='default',
+        additional_dependencies=(),
+):
+    # Build the swift package
+    with clean_path_on_failure(repo_cmd_runner.path(BUILD_DIR)):
+        repo_cmd_runner.run((
+            'swift', 'build',
+            '-C', '{prefix}',
+            '-c', BUILD_CONFIG,
+            '--build-path', repo_cmd_runner.path(BUILD_DIR),
+        ))
+
+def run_hook(repo_cmd_runner, hook, file_args):
+    with(cwd(repo_cmd_runner.path(BUILD_DIR, BUILD_CONFIG))):
+        return xargs(helpers.to_cmd(hook), file_args)