Fix completion in file prompts

qutebrowser/mainwindow/prompt.py

@@ -599,6 +599,11 @@ class FilenamePrompt(_BasePrompt):
         self._file_view.setHeaderHidden(True)
         for col in range(1, 4):
             self._file_view.setColumnHidden(col, True)
+        # Nothing selected initially
+        self._file_view.setCurrentIndex(QModelIndex())
+        # The model needs to be sorted so we get the correct first/last index
+        self._file_model.directoryLoaded.connect(
+            lambda: self._file_model.sort(0))
 
     def accept(self, value=None):
         text = value if value is not None else self._lineedit.text()
@@ -610,18 +615,27 @@ class FilenamePrompt(_BasePrompt):
         assert which in ['prev', 'next'], which
         selmodel = self._file_view.selectionModel()
 
-        first_index = self._file_model.index(0, 0)
-        last_index = self._file_model.index(self._file_model.rowCount() - 1, 0)
+        parent = self._file_view.rootIndex()
+        first_index = self._file_model.index(0, 0, parent)
+        row = self._file_model.rowCount(parent) - 1
+        last_index = self._file_model.index(row, 0, parent)
+
+        if not first_index.isValid():
+            # No entries
+            return
+
+        assert last_index.isValid()
 
         idx = selmodel.currentIndex()
         if not idx.isValid():
             # No item selected yet
             idx = last_index if which == 'prev' else first_index
-
-        if which == 'prev':
+        elif which == 'prev':
             idx = self._file_view.indexAbove(idx)
         else:
+            assert which == 'next', which
             idx = self._file_view.indexBelow(idx)
+
         # wrap around if we arrived at beginning/end
         if not idx.isValid():
             idx = last_index if which == 'prev' else first_index

tests/unit/mainwindow/test_prompt.py

@@ -0,0 +1,53 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+import pytest
+
+from qutebrowser.mainwindow import prompt as promptmod
+from qutebrowser.utils import usertypes
+
+
+@pytest.fixture(autouse=True)
+def setup(qapp, key_config_stub):
+    key_config_stub.set_bindings_for('prompt', {})
+
+
+@pytest.mark.parametrize('steps, where, subfolder', [
+    (1, 'next', '..'),
+    (1, 'prev', 'c'),
+    (2, 'next', 'a'),
+    (2, 'prev', 'b'),
+])
+def test_file_completion(tmpdir, qtbot, steps, where, subfolder):
+    for directory in 'abc':
+        (tmpdir / directory).ensure(dir=True)
+    question = usertypes.Question()
+    question.title = "test"
+    question.default = str(tmpdir) + '/'
+
+    prompt = promptmod.DownloadFilenamePrompt(question)
+    qtbot.add_widget(prompt)
+    with qtbot.wait_signal(prompt._file_model.directoryLoaded):
+        pass
+    assert prompt._lineedit.text() == str(tmpdir) + '/'
+
+    for _ in range(steps):
+        prompt.item_focus(where)
+
+    assert prompt._lineedit.text() == str(tmpdir / subfolder)