Make column width configurable

Use this in the configuration file:

[columns]
column_width = 42

topydo.conf

@@ -66,6 +66,9 @@ append_parent_contexts      = 0
 ;listcontext = lscon
 ;listcontexts = lscon
 
+[columns]
+column_width = 40
+
 [column_keymap]
 ; Keymap configuration for column-mode
 gg = home

topydo/lib/Config.py

@@ -52,6 +52,7 @@ class _Config:
             'add',
             'aliases',
             'colorscheme',
+            'columns',
             'dep',
             'ls',
             'sort',
@@ -117,6 +118,10 @@ class _Config:
                 'listcontexts': 'lscon',
             },
 
+            'columns': {
+                'column_width': '40',
+            },
+
             'column_keymap': {
                 'gg': 'home',
                 'G': 'end',
@@ -383,6 +388,18 @@ class _Config:
         """ Returns the list format used by `ls` """
         return self.cp.get('ls', 'list_format')
 
+    def column_width(self):
+        try:
+            width = self.cp.getint('columns', 'column_width')
+
+            if width < 1:
+                # read default
+                raise ValueError
+
+            return width
+        except ValueError:
+            return int(self.defaults['columns']['column_width'])
+
     def column_keymap(self):
         """ Returns keymap and keystates used in column mode """
         keystates = set()

topydo/ui/columns/Main.py

@@ -95,12 +95,14 @@ class UIApplication(CLIApplicationBase):
 
         self._process_flags()
 
+        self.column_width = config().column_width()
         self.todofile = TodoFile.TodoFile(config().todotxt())
         self.todolist = TodoList.TodoList(self.todofile.read())
 
         self.marked_todos = []
 
-        self.columns = urwid.Columns([], dividechars=0, min_width=COLUMN_WIDTH)
+        self.columns = urwid.Columns([], dividechars=0,
+            min_width=config().column_width())
         self.commandline = CommandLineWidget('topydo> ')
         self.keystate_widget = KeystateWidget()
         self.status_line = urwid.Columns([
@@ -442,7 +444,7 @@ class UIApplication(CLIApplicationBase):
 
         options = self.columns.options(
             width_type='given',
-            width_amount=COLUMN_WIDTH,
+            width_amount=config().column_width(),
             box_widget=True
         )