Add golang package mirroring

pre_commit_mirror_maker/golang/go.mod

@@ -0,0 +1,3 @@
+module github.com/pre-commit/placeholder
+
+go 1.19

pre_commit_mirror_maker/golang/main.go

@@ -0,0 +1,3 @@
+package main
+
+func main() {{}}

pre_commit_mirror_maker/languages.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import json
+import re
 import subprocess
 import urllib.request
 
@@ -33,6 +34,18 @@ def rust_get_package_versions(package_name: str) -> list[str]:
     return list(reversed([version['num'] for version in resp['versions']]))
 
 
+def golang_get_package_versions(package_name: str) -> list[str]:
+    # https://pkg.go.dev/golang.org/x/mod/module#EscapePath
+    # https://github.com/golang/mod/blob/d271cf332fd221d661d13b186b51a11d7e66ff74/module/module.go#L707
+    escaped = re.sub(
+        r'[A-Z]',
+        lambda m: f'!{m.group(0).lower()}', package_name,
+    )
+    url = f'https://proxy.golang.org/{escaped}/@v/list'
+    resp = urllib.request.urlopen(url).read().decode()
+    return sorted(resp.splitlines(), key=version.parse)
+
+
 def node_get_additional_dependencies(
         package_name: str, package_version: str,
 ) -> list[str]:
@@ -45,14 +58,22 @@ def rust_get_additional_dependencies(
     return [f'cli:{package_name}:{package_version}']
 
 
+def golang_get_additional_dependencies(
+        package_name: str, package_version: str,
+) -> list[str]:
+    return [f'{package_name}@{package_version}']
+
+
 LIST_VERSIONS = {
+    'golang': golang_get_package_versions,
     'node': node_get_package_versions,
     'python': python_get_package_versions,
     'ruby': ruby_get_package_versions,
     'rust': rust_get_package_versions,
 }
 
 ADDITIONAL_DEPENDENCIES = {
+    'golang': golang_get_additional_dependencies,
     'node': node_get_additional_dependencies,
     'rust': rust_get_additional_dependencies,
 }

setup.cfg

@@ -35,6 +35,7 @@ console_scripts =
 pre_commit_mirror_maker =
     all/.pre-commit-hooks.yaml
     all/.version
+    golang/*
     node/.npmignore
     node/*
     python/*

tests/languages_test.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from pre_commit_mirror_maker.languages import golang_get_package_versions
 from pre_commit_mirror_maker.languages import node_get_package_versions
 from pre_commit_mirror_maker.languages import python_get_package_versions
 from pre_commit_mirror_maker.languages import ruby_get_package_versions
@@ -39,3 +40,9 @@ def test_rust_get_package_version_output():
     ret = rust_get_package_versions('clap')
     assert ret
     assert_all_text(ret)
+
+
+def test_golang_get_package_version_output():
+    ret = golang_get_package_versions('mvdan.cc/gofumpt')
+    assert ret
+    assert_all_text(ret)

tests/make_repo_test.py

@@ -236,3 +236,24 @@ def test_rust_integration(in_git_dir):
     assert _cmd('git', 'log', '--oneline')
 
     # TODO: test that the package is installable
+
+
+def test_golang_integration(in_git_dir):
+    make_repo(
+        '.',
+        language='golang', name='mvdan.cc/gofumpt', description='',
+        entry='gofumpt', id='gofumpt', match_key='types', match_val='go',
+        args='-w', require_serial='false', minimum_pre_commit_version='0',
+    )
+    # Our files should exist
+    assert in_git_dir.join('.version').exists()
+    assert in_git_dir.join('.pre-commit-hooks.yaml').exists()
+    assert in_git_dir.join('go.mod').exists()
+    assert in_git_dir.join('main.go').exists()
+
+    # Should have made _some_ tags
+    assert _cmd('git', 'tag', '-l')
+    # Should have made _some_ commits
+    assert _cmd('git', 'log', '--oneline')
+
+    # TODO: test that the package is installable