Allow UIs to override the window size

The console widget is slightly smaller than the terminal size, so the
column UI should help get_terminal_size a bit to determine the correct
size.

topydo/lib/Utils.py

@@ -23,12 +23,6 @@ import re
 from collections import namedtuple
 from datetime import date
 
-# shutil.get_terminal_size was added to the standard library in Python 3.3
-try:
-    from shutil import get_terminal_size as _get_terminal_size  # pylint: disable=no-name-in-module
-except ImportError:
-    from backports.shutil_get_terminal_size import get_terminal_size as _get_terminal_size  # pylint: disable=import-error
-
 
 def date_string_to_date(p_date):
     """
@@ -61,19 +55,42 @@ def escape_ansi(p_string):
 escape_ansi.pattern = re.compile(r'\x1b[^m]*m')
 
 
-def get_terminal_size():
+def get_terminal_size(p_getter=None):
     """
     Try to determine terminal size at run time. If that is not possible,
     returns the default size of 80x24.
+
+    By default, the size is determined with provided get_terminal_size by
+    shutil. Sometimes an UI may want to specify the desired width, then it can
+    provide a getter that returns a named tuple (columns, lines) with the size.
     """
+
     try:
-        sz = _get_terminal_size()
-    except ValueError:
-        """
-        This can result from the 'underlying buffer being detached', which
-        occurs during running the unittest on Windows (but not on Linux?)
-        """
-        terminal_size = namedtuple('Terminal_Size', 'columns lines')
-        sz = terminal_size((80, 24))
-
-    return sz
+        return get_terminal_size.getter()
+    except AttributeError:
+        if p_getter:
+            get_terminal_size.getter = p_getter
+        else:
+            def inner():
+                try:
+                    # shutil.get_terminal_size was added to the standard
+                    # library in Python 3.3
+                    try:
+                        from shutil import get_terminal_size as _get_terminal_size  # pylint: disable=no-name-in-module
+                    except ImportError:
+                        from backports.shutil_get_terminal_size import get_terminal_size as _get_terminal_size  # pylint: disable=import-error
+
+                    sz = _get_terminal_size()
+                except ValueError:
+                    """
+                    This can result from the 'underlying buffer being detached', which
+                    occurs during running the unittest on Windows (but not on Linux?)
+                    """
+                    terminal_size = namedtuple('Terminal_Size', 'columns lines')
+                    sz = terminal_size((80, 24))
+
+                return sz
+
+            get_terminal_size.getter = inner
+
+        return get_terminal_size.getter()

topydo/ui/ConsoleWidget.py

@@ -21,6 +21,8 @@ class ConsoleWidget(urwid.LineBox):
         urwid.register_signal(ConsoleWidget, ['close'])
 
         self.text = urwid.Text(p_text)
+        self.width = 0
+
         super().__init__(self.text)
 
     def keypress(self, p_size, p_key):
@@ -29,6 +31,14 @@ class ConsoleWidget(urwid.LineBox):
 
         # don't return the key, 'enter', 'escape' or 'q' are your only escape.
 
+    def render(self, p_size, focus):
+        """
+        This override intercepts the width of the widget such that it can be
+        stored. The width is used for rendering `ls` output.
+        """
+        self.width = p_size[0]
+        return super().render(p_size, focus)
+
     def selectable(self):
         return True
 
@@ -37,3 +47,7 @@ class ConsoleWidget(urwid.LineBox):
 
     def clear(self):
         self.text.set_text("")
+
+    def console_width(self):
+        # return the last known width (last render)
+        return self.width

topydo/ui/Main.py

@@ -14,6 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from collections import namedtuple
 import shlex
 import urwid
 
@@ -27,6 +28,7 @@ from topydo.ui.ColumnLayout import columns
 from topydo.lib.Config import config
 from topydo.lib.Sorter import Sorter
 from topydo.lib.Filter import get_filter_list, RelevanceFilter, DependencyFilter
+from topydo.lib.Utils import get_terminal_size
 from topydo.lib.View import View
 from topydo.lib import TodoFile
 from topydo.lib import TodoList
@@ -81,6 +83,7 @@ class UIApplication(CLIApplicationBase):
 
         # console widget
         self.console = ConsoleWidget()
+        get_terminal_size(self._console_width)
 
         urwid.connect_signal(self.commandline, 'blur', self._blur_commandline)
         urwid.connect_signal(self.commandline, 'execute_command',
@@ -355,6 +358,13 @@ class UIApplication(CLIApplicationBase):
 
         return user_input[0]
 
+    def _console_width(self):
+        terminal_size = namedtuple('Terminal_Size', 'columns lines')
+        width = self.console.console_width() - 2
+        sz = terminal_size(width, 1)
+
+        return sz
+
     def run(self):
         layout = columns()
         if len(layout) > 0: