1 files changed, 97 insertions, 0 deletions
diff --git a/pre_commit/languages/golang.py b/pre_commit/languages/golang.py
new file mode 100644
index 0000000..91ade1e
--- /dev/null
+++ b/pre_commit/languages/golang.py
@@ -0,0 +1,97 @@
+import contextlib
+import os.path
+import sys
+from typing import Generator
+from typing import Sequence
+from typing import Tuple
+
+import pre_commit.constants as C
+from pre_commit import git
+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
+from pre_commit.util import cmd_output_b
+from pre_commit.util import rmtree
+
+ENVIRONMENT_DIR = 'golangenv'
+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]:
+    envdir = prefix.path(
+        helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
+    )
+    with envcontext(get_env_patch(envdir)):
+        yield
+
+
+def guess_go_dir(remote_url: str) -> str:
+    if remote_url.endswith('.git'):
+        remote_url = remote_url[:-1 * len('.git')]
+    looks_like_url = (
+        not remote_url.startswith('file://') and
+        ('//' in remote_url or '@' in remote_url)
+    )
+    remote_url = remote_url.replace(':', '/')
+    if looks_like_url:
+        _, _, remote_url = remote_url.rpartition('//')
+        _, _, remote_url = remote_url.rpartition('@')
+        return remote_url
+    else:
+        return 'unknown_src_dir'
+
+
+def install_environment(
+        prefix: Prefix,
+        version: str,
+        additional_dependencies: Sequence[str],
+) -> None:
+    helpers.assert_version_default('golang', version)
+    directory = prefix.path(
+        helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
+    )
+
+    with clean_path_on_failure(directory):
+        remote = git.get_remote_url(prefix.prefix_dir)
+        repo_src_dir = os.path.join(directory, 'src', guess_go_dir(remote))
+
+        # Clone into the goenv we'll create
+        helpers.run_setup_cmd(prefix, ('git', 'clone', '.', repo_src_dir))
+
+        if sys.platform == 'cygwin':  # pragma: no cover
+            _, gopath, _ = cmd_output('cygpath', '-w', directory)
+            gopath = gopath.strip()
+        else:
+            gopath = directory
+        env = dict(os.environ, GOPATH=gopath)
+        env.pop('GOBIN', None)
+        cmd_output_b('go', 'get', './...', cwd=repo_src_dir, env=env)
+        for dependency in additional_dependencies:
+            cmd_output_b('go', 'get', dependency, cwd=repo_src_dir, env=env)
+        # Same some disk space, we don't need these after installation
+        rmtree(prefix.path(directory, 'src'))
+        pkgdir = prefix.path(directory, 'pkg')
+        if os.path.exists(pkgdir):  # pragma: no cover (go<1.10)
+            rmtree(pkgdir)
+
+
+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)