Support user-specified column-layout file

User can now use '-l' option with an argument *after* 'columns' command
and topydo will try to load column layout from that location. If it
won't find specified file it will use standard column-layout file
locations as a fallback.

Example of use:
Will work: `topydo columns -l ~/fooBar_columns`
Won't work: `topydo -l ~/fooBar_columns columns`

Implements #147

topydo/ui/columns/ColumnLayout.py

@@ -15,10 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import configparser
+from os.path import expanduser
 
 from topydo.lib.Config import home_config_path, config
 
-def columns():
+
+def columns(p_alt_layout_path=None):
     """
     Returns list with complete column configuration dicts.
     """
@@ -49,6 +51,8 @@ def columns():
         "/etc/topydo_columns.conf",
     ]
 
+    if p_alt_layout_path is not None:
+        files.insert(0, expanduser(p_alt_layout_path))
     for filename in files:
         if cp.read(filename):
             break

topydo/ui/columns/Main.py

@@ -15,7 +15,9 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import datetime
+import getopt
 import shlex
+import sys
 import time
 import urwid
 
@@ -30,7 +32,7 @@ from topydo.lib.Utils import get_terminal_size
 from topydo.lib.View import View
 from topydo.lib import TodoFile
 from topydo.lib import TodoList
-from topydo.ui.CLIApplicationBase import CLIApplicationBase
+from topydo.ui.CLIApplicationBase import CLIApplicationBase, error
 from topydo.ui.columns.CommandLineWidget import CommandLineWidget
 from topydo.ui.columns.ConsoleWidget import ConsoleWidget
 from topydo.ui.columns.KeystateWidget import KeystateWidget
@@ -92,7 +94,19 @@ class UIApplication(CLIApplicationBase):
     def __init__(self):
         super().__init__()
 
-        self._process_flags()
+        args = self._process_flags()
+
+        try:
+            opts, args = getopt.getopt(args[1:], 'l:')
+        except getopt.GetoptError as e:
+            error(str(e))
+            sys.exit(1)
+
+        self.alt_layout_path = None
+
+        for opt, value in opts:
+            if opt == "-l":
+                self.alt_layout_path = value
 
         self.column_width = config().column_width()
         self.todofile = TodoFile.TodoFile(config().todotxt())
@@ -576,7 +590,7 @@ class UIApplication(CLIApplicationBase):
             return False
 
     def run(self):
-        layout = columns()
+        layout = columns(self.alt_layout_path)
         if len(layout) > 0:
             for column in layout:
                 self._add_column(self._viewdata_to_view(column))