Tests for helper functions in flags.py

.travis.yml

@@ -3,11 +3,11 @@ python:
   - "2.6"
   - "2.7"
 install:
-  - pip install flake8
+  - pip install -r python/test_requirements.txt --use-mirrors
 compiler:
   - gcc
   - clang
-script: flake8 --exclude=jedi --select=F,C9 --max-complexity=10 python && ./install.sh
+script: flake8 --exclude=jedi --select=F,C9 --max-complexity=10 python && nosetests python && ./install.sh
 env:
   - YCM_TESTRUN=1 EXTRA_CMAKE_ARGS=""
   - YCM_TESTRUN=1 EXTRA_CMAKE_ARGS="-DUSE_CLANG_COMPLETER=ON"

python/completers/cpp/flags.py

@@ -26,6 +26,7 @@ NO_EXTRA_CONF_FILENAME_MESSAGE = ('No {0} file detected, so no compile flags '
   'are available. Thus no semantic support for C/C++/ObjC/ObjC++. See the '
   'docs for details.').format( extra_conf_store.YCM_EXTRA_CONF_FILENAME )
 
+
 class Flags( object ):
   """Keeps track of the flags necessary to compile a file.
   The flags are loaded from user-created python files (hereafter referred to as
@@ -121,10 +122,18 @@ def _SanitizeFlags( flags ):
 def _RemoveUnusedFlags( flags, filename ):
   """Given an iterable object that produces strings (flags for Clang), removes
   the '-c' and '-o' options that Clang does not like to see when it's producing
-  completions for a file."""
+  completions for a file. Also removes the first flag in the list if it does not
+  start with a '-' (it's highly likely to be the compiler name/path)."""
 
   new_flags = []
-  skip = True
+
+  # When flags come from the compile_commands.json file, the first flag is
+  # usually the path to the compiler that should be invoked. We want to strip
+  # that.
+  if not flags[ 0 ].startswith( '-' ):
+    flags = flags[ 1: ]
+
+  skip = False
   for flag in flags:
     if skip:
       skip = False

python/completers/cpp/tests/flags_test.py

@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2011, 2012  Strahinja Val Markovic  <val@markovic.io>
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe 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.
+#
+# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.
+
+from nose.tools import eq_
+from ycm_test_utils import MockVimModule
+vim_mock = MockVimModule()
+from .. import flags
+
+
+def SanitizeFlags_Passthrough_test():
+  eq_( [ '-foo', '-bar' ],
+       list( flags._SanitizeFlags( [ '-foo', '-bar' ] ) ) )
+
+
+def SanitizeFlags_ArchRemoved_test():
+  expected = [ '-foo', '-bar' ]
+  to_remove = [ '-arch', 'arch_of_evil' ]
+
+  eq_( expected,
+       list( flags._SanitizeFlags( expected + to_remove ) ) )
+
+  eq_( expected,
+       list( flags._SanitizeFlags( to_remove + expected ) ) )
+
+  eq_( expected,
+       list( flags._SanitizeFlags(
+         expected[ :1 ] + to_remove + expected[ -1: ] ) ) )
+
+
+def RemoveUnusedFlags_Passthrough_test():
+  eq_( [ '-foo', '-bar' ],
+       flags._RemoveUnusedFlags( [ '-foo', '-bar' ], 'file' ) )
+
+
+def RemoveUnusedFlags_RemoveCompilerPathIfFirst_test():
+  def tester( path ):
+    eq_( expected,
+        flags._RemoveUnusedFlags( [ path ] + expected, filename ) )
+
+  compiler_paths = [ 'c++', 'c', 'gcc', 'g++', 'clang', 'clang++',
+                     '/usr/bin/c++', '/some/other/path', 'some_command' ]
+  expected = [ '-foo', '-bar' ]
+  filename = 'file'
+
+  for compiler in compiler_paths:
+    yield tester, compiler
+
+
+def RemoveUnusedFlags_RemoveDashC_test():
+  expected = [ '-foo', '-bar' ]
+  to_remove = [ '-c' ]
+  filename = 'file'
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( expected + to_remove, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( to_remove + expected, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags(
+         expected[ :1 ] + to_remove + expected[ -1: ], filename ) )
+
+
+def RemoveUnusedFlags_RemoveDashO_test():
+  expected = [ '-foo', '-bar' ]
+  to_remove = [ '-o', 'output_name' ]
+  filename = 'file'
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( expected + to_remove, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( to_remove + expected, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags(
+         expected[ :1 ] + to_remove + expected[ -1: ], filename ) )
+
+
+def RemoveUnusedFlags_RemoveFilename_test():
+  expected = [ '-foo', '-bar' ]
+  to_remove = [ 'file' ]
+  filename = 'file'
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( expected + to_remove, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags( to_remove + expected, filename ) )
+
+  eq_( expected,
+       flags._RemoveUnusedFlags(
+         expected[ :1 ] + to_remove + expected[ -1: ], filename ) )
+

python/test_requirements.txt

@@ -0,0 +1,3 @@
+flake8>=2.0
+mock>=1.0.1
+nose>=1.3.0

python/ycm_test_utils.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2011, 2012  Strahinja Val Markovic  <val@markovic.io>
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe 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.
+#
+# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.
+
+from mock import MagicMock
+import sys
+
+def MockVimModule():
+  """The 'vim' module is something that is only present when running inside the
+  Vim Python interpreter, so we replace it with a MagicMock for tests. """
+
+  vim_mock = MagicMock()
+  vim_mock.eval = MagicMock( return_value = '' )
+  sys.modules[ 'vim' ] = vim_mock
+  return vim_mock