Don't crash on shlex.split error

Show some meaningful error messages instead.

Fixes #107

test/data/aliases.conf

@@ -4,3 +4,4 @@ baz = FooBar
 format = ls -F "|I| x c d {(}p{)} s k" -n 25
 smile = ls ☻
 star = tag {} star 1
+quot = lol'd

test/test_get_sub_command.py

@@ -21,9 +21,8 @@ from topydo.Commands import get_subcommand
 from topydo.commands.AddCommand import AddCommand
 from topydo.commands.DeleteCommand import DeleteCommand
 from topydo.commands.ListCommand import ListCommand
-from topydo.commands.ListProjectCommand import ListProjectCommand
 from topydo.commands.TagCommand import TagCommand
-from topydo.lib.Config import config
+from topydo.lib.Config import config, ConfigError
 
 class GetSubcommandTest(TopydoTest):
     def test_normal_cmd(self):
@@ -120,6 +119,15 @@ class GetSubcommandTest(TopydoTest):
         real_cmd, final_args = get_subcommand(args)
         self.assertEqual(real_cmd, None)
 
+    def test_alias_quotation(self):
+        config("test/data/aliases.conf")
+
+        args = ["quot"]
+        with self.assertRaises(ConfigError) as ce:
+            get_subcommand(args)
+
+        self.assertEqual(str(ce.exception), 'No closing quotation')
+
     def test_help(self):
         real_cmd, final_args = get_subcommand(['help', 'nonexisting'])
         self.assertFalse(real_cmd)

topydo/Commands.py

@@ -21,7 +21,7 @@ instance based on an argument list.
 
 import sys
 
-from topydo.lib.Config import config
+from topydo.lib.Config import config, ConfigError
 
 _SUBCOMMAND_MAP = {
     'add': 'AddCommand',
@@ -90,7 +90,11 @@ def get_subcommand(p_args):
         If alias resolves to non-existent command, main help message is
         returned.
         """
+        try:
             real_subcommand, alias_args = alias_map[p_alias]
+        except ValueError as ve:
+            raise ConfigError(alias_map[p_alias]) from ve
+
         try:
             result = import_subcommand(real_subcommand)
             args = join_args(p_args, alias_args)

topydo/cli/CLI.py

@@ -50,7 +50,11 @@ class CLIApplication(CLIApplicationBase):
         self.todofile = TodoFile.TodoFile(config().todotxt())
         self.todolist = TodoList.TodoList(self.todofile.read())
 
+        try:
             (subcommand, args) = get_subcommand(args)
+        except ConfigError as ce:
+            error('Error: ' + str(ce) + '. Check your aliases configuration')
+            sys.exit(1)
 
         if subcommand is None:
             self._usage()

topydo/cli/Prompt.py

@@ -99,9 +99,16 @@ class PromptApplication(CLIApplicationBase):
                 sys.exit(0)
             except KeyboardInterrupt:
                 continue
+            except ValueError as verr:
+                error('Error: ' + str(verr))
 
             mtime_after = _todotxt_mtime()
+
+            try:
                 (subcommand, args) = get_subcommand(user_input)
+            except ConfigError as ce:
+                error('Error: ' + str(ce) + '. Check your aliases configuration')
+                continue
 
             # refuse to perform operations such as 'del' and 'do' if the
             # todo.txt file has been changed in the background.

topydo/lib/Config.py

@@ -18,6 +18,7 @@ import configparser
 import os
 import shlex
 
+
 class ConfigError(Exception):
     def __init__(self, p_text):
         self.text = p_text
@@ -299,10 +300,13 @@ class _Config:
         alias_dict = dict()
 
         for alias, meaning in aliases:
+            try:
                 meaning = shlex.split(meaning)
                 real_subcommand = meaning[0]
                 alias_args = meaning[1:]
                 alias_dict[alias] = (real_subcommand, alias_args)
+            except ValueError as verr:
+                alias_dict[alias] = str(verr)
 
         return alias_dict