Add unpack_dependencies function

lutris/util/strings.py

@@ -47,3 +47,25 @@ def version_sort(versions, reverse=False):
         version.append(suffix)
         return version
     return sorted(versions, key=version_key, reverse=reverse)
+
+
+def unpack_dependencies(string):
+    """Parse a string to allow for complex dependencies
+    Works in a similar fashion as Debian dependencies, separate dependencies
+    are comma separated and multiple choices for satisfying a dependency are
+    separated by pipes.
+
+    Example: quake-steam | quake-gog, some-quake-mod returns:
+        [('quake-steam', 'quake-gog'), 'some-quake-mod']
+    """
+    dependencies = string.split(',')
+    dependencies = [dep.strip() for dep in dependencies if dep.strip()]
+    for index, dependency in enumerate(dependencies):
+        if '|' in dependency:
+            choices = tuple([choice.strip()
+                             for choice in dependencies[index].split('|')
+                             if choice.strip()])
+            dependencies[index] = choices
+
+    dependencies = [dep for dep in dependencies if dep]
+    return dependencies

tests/test_utils.py

@@ -128,3 +128,25 @@ class TestEvilConfigParser(TestCase):
         parser.set('Test', 'key', 'value')
         with open(self.config_path, 'wb') as config:
             parser.write(config)
+
+
+class TestUnpackDependencies(TestCase):
+    def test_single_dependency(self):
+        string = 'quake'
+        dependencies = strings.unpack_dependencies(string)
+        self.assertEqual(dependencies, ['quake'])
+
+    def test_multiple_dependencies(self):
+        string = 'quake,  quake-1,quake-steam, quake-gog   '
+        dependencies = strings.unpack_dependencies(string)
+        self.assertEqual(dependencies, ['quake', 'quake-1', 'quake-steam', 'quake-gog'])
+
+    def test_dependency_options(self):
+        string = 'quake,  quake-1,quake-steam | quake-gog|quake-humble   '
+        dependencies = strings.unpack_dependencies(string)
+        self.assertEqual(dependencies, ['quake', 'quake-1', ('quake-steam', 'quake-gog', 'quake-humble')])
+
+    def test_strips_extra_commas(self):
+        string = ', , , ,, ,,,,quake,  quake-1,quake-steam | quake-gog|quake-humble |||| , |, | ,|,| ,  '
+        dependencies = strings.unpack_dependencies(string)
+        self.assertEqual(dependencies, ['quake', 'quake-1', ('quake-steam', 'quake-gog', 'quake-humble')])