InfoCollector: Collect info from project files

Adds a module "InfoCollector" to collect information
from project files using the ``InfoExtractor`` classes.

Related to #131

coala_quickstart/generation/InfoCollector.py

@@ -0,0 +1,45 @@
+from coala_quickstart.info_extractors.EditorconfigInfoExtractor import (
+    EditorconfigInfoExtractor)
+from coala_quickstart.info_extractors.PackageJSONInfoExtractor import (
+    PackageJSONInfoExtractor)
+from coala_quickstart.info_extractors.GemfileInfoExtractor import (
+    GemfileInfoExtractor)
+
+
+def collect_info(project_dir):
+    """
+    Collects information extracted by various ``InfoExtractor``
+    classes and returns them as a dictionary.
+    """
+    editorconfig_info = EditorconfigInfoExtractor(
+        [".editorconfig"], project_dir).extract_information()
+
+    package_json_info = PackageJSONInfoExtractor(
+        ["package.json"], project_dir).extract_information()
+
+    gemfile_info = GemfileInfoExtractor(
+        ["Gemfile"], project_dir).extract_information()
+
+    extracted_info = aggregate_info([
+        editorconfig_info, package_json_info, gemfile_info])
+
+    return extracted_info
+
+
+def aggregate_info(infoextractors):
+    """
+    Aggregates inforamtion extracted from multiple ``InfoExtractor``
+    instances to one dictionary.
+
+    :param infoextractors: list of values of ``information`` attribute
+                           of different ``InfoExtractor`` instances.
+    """
+    result = {}
+    for ie in infoextractors:
+        for fname, extracted_info in ie.items():
+            for info_name, info_instances in extracted_info.items():
+                if result.get(info_name):
+                    result[info_name] += info_instances
+                else:
+                    result[info_name] = info_instances
+    return result

tests/generation/InfoCollectorTest.py

@@ -0,0 +1,100 @@
+import os
+import unittest
+
+from coala_quickstart.generation.InfoCollector import (
+    collect_info)
+from tests.TestUtilities import generate_files
+
+
+package_json = """
+{
+    "name": "awesome-packages",
+    "version": "0.8.0",
+    "license": "MIT",
+    "dependencies": {
+        "coffeelint": "~1",
+        "ramllint": ">=1.2.2 <1.2.4"
+    },
+    "files": ["dist"],
+    "man" : ["./man/foo.1", "./man/bar.1"]
+}
+"""
+
+editorconfig = """
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,py}]
+charset = utf-8
+trim_trailing_whitespace = true
+indent_size = tab
+tab_width = 4
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2
+"""
+
+gemfile = """
+source "https://rubygems.org"
+
+gem "puppet-lint", "2.1.1"
+gem "rubocop", "0.47.1"
+gem "scss_lint", require: false
+gem "RedCloth", :require => "redcloth"
+gem "omniauth", ">= 0.2.6", :git => "git://github.com/intridea/omniauth.git"
+
+group :assets do
+  gem 'some-gem', source: "https://gems.example.com"
+end
+gem "rspec-rails", ">= 2.6.1", :group => [:development, :test]
+end
+"""
+
+
+class InfoCollectorTest(unittest.TestCase):
+
+    def setUp(self):
+        self.uut = collect_info
+        self.test_dir = os.path.join(
+            os.path.dirname(os.path.realpath(__file__)),
+            "information_collector_testfiles")
+
+    def test_collected_info(self):
+
+        files_to_create = ["package.json", ".editorconfig", "Gemfile"]
+        target_file_contents = [package_json, editorconfig, gemfile]
+
+        with generate_files(
+                files_to_create,
+                target_file_contents,
+                self.test_dir) as gen_files:
+
+            collected_info = self.uut(self.test_dir)
+
+            expected_results = [
+                ('TrailingWhitespaceInfo', ['.editorconfig'], 1),
+                ('FinalNewlineInfo', ['.editorconfig'], 1),
+                ('IndentStyleInfo', ['.editorconfig'], 2),
+                ('IndentSizeInfo', ['.editorconfig'], 3),
+                ('LineBreaksInfo', ['.editorconfig'], 1),
+                ('CharsetInfo', ['.editorconfig'], 1),
+                ('ProjectDependencyInfo', ['Gemfile', 'package.json'], 9),
+                ('ManFilesInfo', ['package.json'], 1),
+                ('LicenseUsedInfo', ['package.json'], 1),
+                ('IncludePathsInfo', ['package.json'], 1)]
+
+            self.assertEqual(len(collected_info.keys()), len(expected_results))
+
+            for iname, isources, icount in expected_results:
+                self.assertEqual(len(collected_info[iname]), icount)
+                isources = [os.path.normcase(i) for i in isources]
+                for info in collected_info[iname]:
+                    self.assertIn(info.source, isources)