[FEATURE] [PERF] Adds support for ID_LIKE (from os-release)

> See <https://www.freedesktop.org/software/systemd/man/os-release.html#ID_LIKE=>.

+ Optimizes `Output` initialization using full `Enum` features

archey/output.py

@@ -23,13 +23,19 @@ class Output:
         if 'microsoft' in check_output(['uname', '-r'], universal_newlines=True).lower():
             self.distribution = Distributions.WINDOWS
         else:
-            distribution_id = distro.id()
-            for distribution in Distributions:
-                if distribution_id == distribution.value:
-                    self.distribution = distribution
+            try:
+                self.distribution = Distributions(distro.id())
+            except ValueError:
+                # See <https://www.freedesktop.org/software/systemd/man/os-release.html#ID_LIKE=>.
+                for distro_like in distro.like().split(' '):
+                    try:
+                        self.distribution = Distributions(distro_like)
+                    except ValueError:
+                        continue
                     break
-            else:
-                self.distribution = Distributions.LINUX
+                else:
+                    # Well, we didn't match anything so let's fall-back to default `Linux`.
+                    self.distribution = Distributions.LINUX
 
         # Fetch the colors palette related to this distribution.
         self.colors_palette = COLOR_DICT[self.distribution]

archey/test/test_archey_output.py

@@ -41,6 +41,60 @@ class TestOutputUtil(unittest.TestCase):
 
         self.assertEqual(output.distribution, Distributions.LINUX)
 
+    @patch(
+        'archey.output.check_output',
+        return_value='X.Y.Z-R-ARCH\n'
+    )
+    @patch(
+        'archey.output.distro.id',
+        return_value=''  # Unknown distribution.
+    )
+    @patch(
+        'archey.output.distro.like',
+        return_value='ubuntu'  # Oh, it's actually an Ubuntu-based one !
+    )
+    def test_init_distro_like(self, _, __, ___):
+        """Test distribution matching from the `os-release`'s `ID_LIKE` option"""
+        output = Output()
+
+        self.assertEqual(output.distribution, Distributions.UBUNTU)
+
+    @patch(
+        'archey.output.check_output',
+        return_value='X.Y.Z-R-ARCH\n'
+    )
+    @patch(
+        'archey.output.distro.id',
+        return_value=''  # Unknown distribution.
+    )
+    @patch(
+        'archey.output.distro.like',
+        return_value='linuxmint debian'  # Oh, what do we got there ?!
+    )
+    def test_init_distro_like_multiple(self, _, __, ___):
+        """Test distribution matching from the `os-release`'s `ID_LIKE` option (multiple entries)"""
+        output = Output()
+
+        self.assertEqual(output.distribution, Distributions.LINUX_MINT)
+
+    @patch(
+        'archey.output.check_output',
+        return_value='X.Y.Z-R-ARCH\n'
+    )
+    @patch(
+        'archey.output.distro.id',
+        return_value=''  # Unknown distribution.
+    )
+    @patch(
+        'archey.output.distro.like',
+        return_value=''  # No `ID_LIKE` either...
+    )
+    def test_init_both_distro_calls_fail(self, _, __, ___):
+        """Test distribution fall-back when `distro` soft-fail two times"""
+        output = Output()
+
+        self.assertEqual(output.distribution, Distributions.LINUX)
+
     @patch(
         'archey.output.check_output',
         return_value='X.Y.Z-R-Microsoft\n'