Add context to result

docs/features.md

@@ -6,6 +6,7 @@ hold useful information:
 * ``exit_code``: is the exit code of cookiecutter, ``0`` means successful termination
 * ``exception``: is the exception that happened if one did
 * ``project``: a [py.path.local] object pointing to the rendered project
+* ``context``: is the rendered context
 
 The returned ``LocalPath`` instance provides you with a powerful interface
 to filesystem related information, that comes in handy for validating the generated

pytest_cookies.py

@@ -4,6 +4,8 @@
 import pytest
 
 from cookiecutter.main import cookiecutter
+from cookiecutter.generate import generate_context
+from cookiecutter.prompt import prompt_for_config
 
 USER_CONFIG = u"""
 cookiecutters_dir: "{cookiecutters_dir}"
@@ -14,9 +16,16 @@
 class Result(object):
     """Holds the captured result of the cookiecutter project generation."""
 
-    def __init__(self, exception=None, exit_code=0, project_dir=None):
+    def __init__(
+        self,
+        exception=None,
+        exit_code=0,
+        project_dir=None,
+        context=None,
+    ):
         self.exception = exception
         self.exit_code = exit_code
+        self.context = context
         self._project_dir = project_dir
 
     @property
@@ -28,6 +37,7 @@ def project(self):
     def __repr__(self):
         if self.exception:
             return '<Result {!r}>'.format(self.exception)
+
         return '<Result {}>'.format(self.project)
 
 
@@ -50,17 +60,30 @@ def bake(self, extra_context=None, template=None):
         exception = None
         exit_code = 0
         project_dir = None
+        context = None
 
         if template is None:
             template = self._default_template
 
+        context_file = py.path.local(template).join('cookiecutter.json')
+
         try:
+            # Render the context, so that we can store it on the Result
+            context = prompt_for_config(
+                generate_context(
+                    context_file=str(context_file),
+                    extra_context=extra_context,
+                ),
+                no_input=True,
+            )
+
+            # Run cookiecutter to generate a new project
             project_dir = cookiecutter(
                 template,
                 no_input=True,
                 extra_context=extra_context,
                 output_dir=str(self._new_output_dir()),
-                config_file=str(self._config_file)
+                config_file=str(self._config_file),
             )
         except SystemExit as e:
             if e.code != 0:
@@ -70,7 +93,12 @@ def bake(self, extra_context=None, template=None):
             exception = e
             exit_code = -1
 
-        return Result(exception, exit_code, project_dir)
+        return Result(
+            exception=exception,
+            exit_code=exit_code,
+            project_dir=project_dir,
+            context=context,
+        )
 
 
 @pytest.fixture(scope='session')

tests/test_cookies.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import json
+import collections
 
 import pytest
 
@@ -33,10 +34,10 @@ def test_valid_fixture(cookies):
 def cookiecutter_template(tmpdir):
     template = tmpdir.ensure('cookiecutter-template', dir=True)
 
-    template_config = {
-        'repo_name': 'foobar',
-        'short_description': 'Test Project',
-    }
+    template_config = collections.OrderedDict([
+        ('repo_name', 'foobar'),
+        ('short_description', 'Test Project'),
+    ])
     template.join('cookiecutter.json').write(json.dumps(template_config))
 
     template_readme = '\n'.join([
@@ -138,6 +139,85 @@ def test_bake_project(cookies):
     ])
 
 
+def test_cookies_bake_result_context(testdir, cookiecutter_template):
+    """Programmatically create a **Cookiecutter** template and use `bake` to
+    create a project from it.
+
+    Check that the result holds the rendered context.
+    """
+
+    testdir.makepyfile("""
+        # -*- coding: utf-8 -*-
+
+        import collections
+
+        def test_bake_project(cookies):
+            result = cookies.bake(extra_context=collections.OrderedDict([
+                ('repo_name', 'cookies'),
+                ('short_description', '{{cookiecutter.repo_name}} is awesome'),
+            ]))
+
+            assert result.exit_code == 0
+            assert result.exception is None
+            assert result.project.basename == 'cookies'
+            assert result.project.isdir()
+
+            assert result.context == {
+                'repo_name': 'cookies',
+                'short_description': 'cookies is awesome',
+            }
+
+            assert str(result) == '<Result {}>'.format(result.project)
+    """)
+
+    result = testdir.runpytest(
+        '-v',
+        '--template={}'.format(cookiecutter_template)
+    )
+
+    result.stdout.fnmatch_lines([
+        '*::test_bake_project PASSED*',
+    ])
+
+
+def test_cookies_bake_result_context_exception(testdir, cookiecutter_template):
+    """Programmatically create a **Cookiecutter** template and use `bake` to
+    create a project from it.
+
+    Check that exceptions resulting from rendering the context are stored on
+    result and that the rendered context is not set.
+    """
+
+    testdir.makepyfile("""
+        # -*- coding: utf-8 -*-
+
+        import collections
+
+        def test_bake_project(cookies):
+            result = cookies.bake(extra_context=collections.OrderedDict([
+                ('repo_name', 'cookies'),
+                ('short_description', '{{cookiecutter.nope}}'),
+            ]))
+
+            assert result.exit_code == -1
+            assert result.exception is not None
+            assert result.project is None
+
+            assert result.context is None
+
+            assert str(result) == '<Result {!r}>'.format(result.exception)
+    """)
+
+    result = testdir.runpytest(
+        '-v',
+        '--template={}'.format(cookiecutter_template)
+    )
+
+    result.stdout.fnmatch_lines([
+        '*::test_bake_project PASSED*',
+    ])
+
+
 def test_cookies_bake_should_create_new_output_directories(
     testdir, cookiecutter_template
 ):