moved the installing code to its own package

pre_commit/git.py

@@ -1,6 +1,5 @@
 import os
 import pkg_resources
-import contextlib
 
 import pre_commit.constants as C
 from plumbum import local
@@ -9,7 +8,6 @@ from plumbum import local
 def get_root():
     return local['git']['rev-parse', '--show-toplevel']().strip()
 
-
 def get_pre_commit_path():
     return os.path.join(get_root(), '.git/hooks/pre-commit')
 
@@ -30,40 +28,4 @@ def remove_pre_commit():
     local.path(get_pre_commit_path()).delete()
 
 
-class PreCommitProject(object):
-
-    def __init__(self, git_repo_path, sha):
-        self.git_repo_path = git_repo_path
-        self.sha = sha
-
-    @contextlib.contextmanager
-    def in_checkout(self):
-        with local.cwd(get_pre_commit_dir_path()):
-            with local.cwd(self.sha):
-                yield
-
-    def create(self):
-        create_pre_commit_package_dir()
-
-        with local.cwd(get_pre_commit_dir_path()):
-            local['git']['clone', self.git_repo_path, self.sha]()
-            with self.in_checkout():
-                local['git']['checkout', self.sha]()
-
-    def install(self):
-        with self.in_checkout():
-            if local.path('setup.py').exists():
-                local['virtualenv']['py_env']()
-                local['bash']['-c', 'source py_env/bin/activate && pip install .']()
-                print local.cwd.getpath()
-
-def create_repo_in_env(git_repo_path, sha):
-    project = PreCommitProject(git_repo_path, sha)
-    project.create()
-
-def install_pre_commit(git_repo_path, sha):
-    project = PreCommitProject(git_repo_path, sha)
-    project.create()
-    project.install()
-
 

pre_commit/installer/repo_installer.py

@@ -0,0 +1,44 @@
+import contextlib
+
+from plumbum import local
+from pre_commit import git
+
+class RepoInstaller(object):
+
+    def __init__(self, git_repo_path, sha):
+        self.git_repo_path = git_repo_path
+        self.sha = sha
+
+    @contextlib.contextmanager
+    def in_checkout(self):
+        with local.cwd(git.get_pre_commit_dir_path()):
+            with local.cwd(self.sha):
+                yield
+
+    def create(self):
+        git.create_pre_commit_package_dir()
+
+        with local.cwd(git.get_pre_commit_dir_path()):
+            if local.path(self.sha).exists():
+                # Project already exists, no reason to re-create it
+                return
+
+            local['git']['clone', self.git_repo_path, self.sha]()
+            with self.in_checkout():
+                local['git']['checkout', self.sha]()
+
+    def install(self):
+        with self.in_checkout():
+            if local.path('setup.py').exists():
+                local['virtualenv']['py_env']()
+                local['bash']['-c', 'source py_env/bin/activate && pip install .']()
+
+
+def create_repo_in_env(git_repo_path, sha):
+    project = RepoInstaller(git_repo_path, sha)
+    project.create()
+
+def install_pre_commit(git_repo_path, sha):
+    project = RepoInstaller(git_repo_path, sha)
+    project.create()
+    project.install()