Started to test py2 and py3 on travis now.

I also learned that Vim 7.3 does not seem to be working at all anymore.
Fixes a bug that only happens with python3.

.travis.yml

@@ -1,17 +1,15 @@
 language: python
 
 python:
-  # TOOD: add support for one python3 version. The problem here is Vim: we need to install a version of vim that
-  # has py3, but not py2. I could not figure this out so far.
   - 2.7
+  - 3.3
+  - 3.4
+env:
+  - VIM_VERSION="74"
+
+install: sudo ./install_vim.sh "${VIM_VERSION}" "$(python --version 2>&1)"
+
 before_script:
-  # Clone the dependent plugins we want to use.
-  - ./test_all.py --clone-plugins
-  # Install tmux (> 1.8) and vim. 
-  - sudo add-apt-repository ppa:kalakris/tmux -y
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq -y tmux vim-gnome
-  # Start the testing session.
   - tmux new -d -s vim
-  - vim --version
+
 script: ./test_all.py -v --plugins --interface tmux --session vim

autoload/UltiSnips/bootstrap.vim

@@ -11,7 +11,7 @@ function! UltiSnips#bootstrap#Bootstrap()
        if !has("python3")
            if !has("python")
                if !exists("g:UltiSnipsNoPythonWarning")
-                   echo  "UltiSnips requires py >= 2.6 or any py3"
+                   echo  "UltiSnips requires py >= 2.7 or any py3"
                endif
                unlet g:_uspy
                return

doc/UltiSnips.txt

@@ -74,12 +74,11 @@ http://www.sirver.net/blog/2012/03/31/fourth-episode-of-ultisnips-screencast/
 1.1 Requirements                                     *UltiSnips-requirements*
 ----------------
 
-This plugin works with Vim version 7.0 or later. It only works if the
+This plugin works with Vim version 7.4 or later. It only works if the
 'compatible' setting is not set.
 
-This plugin requires python >= 2.6. It has been specifically tested using
-python 2.7 and python 3.2 but should theoretically work on all versions of
-python >= 2.6.
+This plugin is tested against Python 2.7, 3.3 or 3.4. All other versions are
+unsupported, but might work.
 
 The Python 2.x or Python 3.x interface must be available. In other words, Vim
 must be compiled with either the |+python| feature or the |+python3| feature.

install_vim.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# Installs a known version of vim in the travis test runner.
+set -ex
+
+VIM_VERSION=$1; shift
+PYTHON_VERSION=$1; shift
+
+build_vanilla_vim () {
+   URL=$1; shift;
+
+   mkdir vim_build
+   pushd vim_build
+
+   curl $URL -o vim.tar.bz2
+   tar xjf vim.tar.bz2
+   cd vim${VIM_VERSION}
+
+   PYTHON_BUILD_CONFIG=""
+   if [[ $PYTHON_VERSION =~ "Python 2." ]]; then
+      PYTHON_BUILD_CONFIG="--enable-pythoninterp"
+   else
+      PYTHON_BUILD_CONFIG="--enable-python3interp"
+   fi
+   ./configure \
+      --prefix=${HOME} \
+      --disable-nls \
+      --disable-sysmouse \
+      --disable-gpm \
+      --enable-gui=no \
+      --enable-multibyte \
+      --with-features=huge \
+      --with-tlib=ncurses \
+      --without-x \
+      ${PYTHON_BUILD_CONFIG}
+
+   make install
+   popd
+
+   rm -rf vim_build
+}
+
+# Clone the dependent plugins we want to use.
+./test_all.py --clone-plugins
+
+# Install tmux (> 1.8) and vim. 
+add-apt-repository ppa:kalakris/tmux -y
+apt-get update -qq
+apt-get install -qq -y tmux 
+
+if [[ $VIM_VERSION == "74" ]]; then
+   build_vanilla_vim ftp://ftp.vim.org/pub/vim/unix/vim-7.4.tar.bz2
+else
+   echo "Unknown VIM_VERSION: $VIM_VERSION"
+   exit 1
+fi
+
+# Dirty hack, since PATH seems to be ignored.
+ln -sf /home/travis/bin/vim /usr/bin/vim
+
+vim --version

pythonx/UltiSnips/snippet/source/_snippet_dictionary.py

@@ -11,7 +11,7 @@ class SnippetDictionary(object):
     def __init__(self):
         self._snippets = []
         self._cleared = {}
-        self._clear_priority = None
+        self._clear_priority = float("-inf")
 
     def add_snippet(self, snippet):
         """Add 'snippet' to this dictionary."""

test/vim_test_case.py

@@ -32,6 +32,7 @@ class VimTestCase(unittest.TestCase, TempFileManager):
     # Skip this test for the given reason or None for not skipping it.
     skip_if = lambda self: None
     version = None  # Will be set to vim --version output
+    maxDiff = None  # Show all diff output, always.
 
     def __init__(self, *args, **kwargs):
         unittest.TestCase.__init__(self, *args, **kwargs)