Added debug statement hook.

diff --git a/.gitignore b/.gitignore
index 831f634..abd9e46 100644
--- a/.gitignore
+++ b/.gitignore

@@ -9,3 +9,4 @@
 dist
 *.egg-info
 *.iml
+.pre-commit-files

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..89bae15
--- /dev/null
+++ b/.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+
+-
+    repo: git@github.com:pre-commit/pre-commit-hooks
+    sha: 5e713f8878b7d100c0e059f8cc34be4fc2e8f897
+    hooks:
+        -
+            id: pyflakes
+            files: '\.py$'
+
+-
+    repo: git@github.com:pre-commit/pre-commit
+    sha: c77d65d9cbbcf30e2be005f5ba8b63447deedc1e
+    hooks:
+        -
+            id: validate_manifest
+            files: /manifest.yaml
+        -
+            id: validate_config
+            files: /\.pre-commit-config.yaml

diff --git a/Makefile b/Makefile
index 161f6d0..9aedace 100644
--- a/Makefile
+++ b/Makefile

@@ -30,7 +30,7 @@
 		coverage run `which py.test` tests $(TEST_TARGETS) && \
 		coverage report -m'
 
-py_env: requirements.txt
+py_env: requirements.txt setup.py
 	rm -rf py_env
 	virtualenv py_env
 	bash -c 'source py_env/bin/activate && \

diff --git a/manifest.yaml b/manifest.yaml
index 0f24380..f7e7e47 100644
--- a/manifest.yaml
+++ b/manifest.yaml

@@ -5,3 +5,9 @@
     description: This validator runs pyflakes.
     entry: pyflakes
     language: python
+-
+    id: debug-statements
+    name: Debug Statements (Python)
+    description: This hook checks that debug statements (pdb, ipdb, pudb) are not imported on commit.
+    entry: debug-statement-hook
+    language: python

diff --git a/pre_commit_hooks/debug_statement_hook.py b/pre_commit_hooks/debug_statement_hook.py
new file mode 100644
index 0000000..1335cb0
--- /dev/null
+++ b/pre_commit_hooks/debug_statement_hook.py

@@ -0,0 +1,63 @@
+
+import argparse
+import ast
+import collections
+import sys
+
+
+DEBUG_STATEMENTS = set(['pdb', 'ipdb', 'pudb'])
+
+
+DebugStatement = collections.namedtuple(
+    'DebugStatement', ['name', 'line', 'col'],
+)
+
+
+class ImportStatementParser(ast.NodeVisitor):
+    def __init__(self):
+        self.debug_import_statements = []
+
+    def visit_Import(self, node):
+        for node_name in node.names:
+            if node_name.name in DEBUG_STATEMENTS:
+                self.debug_import_statements.append(
+                    DebugStatement(node_name.name, node.lineno, node.col_offset),
+                )
+
+    def visit_ImportFrom(self, node):
+        if node.module in DEBUG_STATEMENTS:
+            self.debug_import_statements.append(
+                DebugStatement(node.module, node.lineno, node.col_offset)
+            )
+
+
+def check_file_for_debug_statements(filename):
+    ast_obj = ast.parse(open(filename).read())
+    visitor = ImportStatementParser()
+    visitor.visit(ast_obj)
+    if visitor.debug_import_statements:
+        for debug_statement in visitor.debug_import_statements:
+            print '{0}:{2}:{3} - {1} imported'.format(filename, *debug_statement)
+        return 1
+    else:
+        return 0
+
+
+def debug_statement_hook(argv):
+    parser = argparse.ArgumentParser()
+    parser.add_argument('filenames', nargs='+', help='Filenames to run')
+    args = parser.parse_args()
+
+    retv = 0
+    for filename in args.filenames:
+        retv |= check_file_for_debug_statements(filename)
+
+    return retv
+
+
+def entry():
+    return debug_statement_hook(sys.argv[1:])
+
+
+if __name__ == '__main__':
+    sys.exit(entry())
\ No newline at end of file

diff --git a/requirements.txt b/requirements.txt
index 5539ad9..0c043a5 100644
--- a/requirements.txt
+++ b/requirements.txt

@@ -6,4 +6,5 @@
 coverage
 ipdb
 mock
+git+git://github.com/pre-commit/pre-commit#egg=pre-commit
 pytest

diff --git a/setup.py b/setup.py
index 496f5aa..ccca970 100644
--- a/setup.py
+++ b/setup.py

@@ -10,4 +10,9 @@
         'pyflakes',
         'simplejson',
     ],
+    entry_points={
+        'console_scripts': [
+            'debug-statement-hook = pre_commit_hooks.debug_statement_hook:entry',
+        ],
+    },
 )

diff --git a/tests/debug_statement_hook_test.py b/tests/debug_statement_hook_test.py
new file mode 100644
index 0000000..ecfdbc0
--- /dev/null
+++ b/tests/debug_statement_hook_test.py

@@ -0,0 +1,56 @@
+
+import ast
+import pytest
+
+from pre_commit_hooks.debug_statement_hook import ImportStatementParser, \
+    DebugStatement
+
+
+@pytest.fixture
+def ast_with_no_debug_imports():
+    return ast.parse("""
+import foo
+import bar
+import baz
+from foo import bar
+""")
+
+
+@pytest.fixture
+def ast_with_debug_import_form_1():
+    return ast.parse("""
+
+import ipdb; ipdb.set_trace()
+
+""")
+
+
+@pytest.fixture
+def ast_with_debug_import_form_2():
+    return ast.parse("""
+
+from pudb import set_trace; set_trace()
+
+""")
+
+
+def test_returns_no_debug_statements(ast_with_no_debug_imports):
+    visitor = ImportStatementParser()
+    visitor.visit(ast_with_no_debug_imports)
+    assert visitor.debug_import_statements == []
+
+
+def test_returns_one_form_1(ast_with_debug_import_form_1):
+    visitor = ImportStatementParser()
+    visitor.visit(ast_with_debug_import_form_1)
+    assert visitor.debug_import_statements == [
+        DebugStatement('ipdb', 3, 0)
+    ]
+
+
+def test_returns_one_form_2(ast_with_debug_import_form_2):
+    visitor = ImportStatementParser()
+    visitor.visit(ast_with_debug_import_form_2)
+    assert visitor.debug_import_statements == [
+        DebugStatement('pudb', 3, 0)
+    ]
\ No newline at end of file