Add local file completer

cliglue/autocomplete/completers.py

@@ -0,0 +1,6 @@
+import os
+
+
+def file_completer():
+    files = [f for f in os.listdir('.')]
+    return sorted(files)

tests/autocomplete/test_autocomplete.py

@@ -1,4 +1,5 @@
 from cliglue import *
+from cliglue.autocomplete.completers import file_completer
 from tests.asserts import MockIO
 
 
@@ -223,3 +224,27 @@ def test_completing_word_in_the_middle():
             subcommand('run'),
         ).run()
         assert mockio.stripped() == 'run'
+
+
+def test_complete_with_completer_function():
+    def complete():
+        return ['42', '47', '53']
+
+    with MockIO('--autocomplete', '"app 4"') as mockio:
+        CliBuilder(reraise_error=True).has(
+            arguments('a', choices=complete),
+        ).run()
+        assert mockio.stripped() == '42\n47'
+
+
+def test_file_completer():
+    with MockIO('--autocomplete', '"app "') as mockio:
+        CliBuilder(reraise_error=True).has(
+            arguments('f', choices=file_completer),
+        ).run()
+        proposals = mockio.stripped().splitlines()
+        assert '.gitignore' in proposals
+        assert 'tests' in proposals
+        assert 'tests/builder' not in proposals
+        assert '.' not in proposals
+        assert '..' not in proposals