Use classes for managing vim interaction

Create classes for interacting with vim, a base class with common
methods, a class for interacting via screen, and one for interacting on
Windows.

At startup time an instance of one of these classes is created, and that
object is passed to all of the tests instead of the session.

I haven't been able to get UltiSnips working in vim on Windows to really
test this, but I have verified that vim interactions still work.

test.py

@@ -39,8 +39,6 @@ import sys
 
 from textwrap import dedent
 
-WIN = platform.system() == "Windows"
-
 # Some constants for better reading
 BS = '\x7f'
 ESC = '\x1b'
@@ -63,28 +61,34 @@ EA = "#" # Expand anonymous
 COMPL_KW = chr(24)+chr(14)
 COMPL_ACCEPT = chr(25)
 
+class VimInterface:
+    def focus(title=None):
+        pass
 
-################ windows ################
+    def send_keystrokes(self, str, sleeptime):
+        """
+        Send the keystrokes to vim via screen. Pause after each char, so
+        vim can handle this
+        """
+        for c in str:
+            self.send(c)
+            time.sleep(sleeptime)
 
-if WIN:
+class VimInterfaceScreen(VimInterface):
-    # import windows specific modules
+    def __init__(self, session):
-    import win32com.client, win32gui
+        self.session = session
-    shell = win32com.client.Dispatch("WScript.Shell")
 
-def focus_win(title=None):
+    def send(self, s):
-    if not shell.AppActivate(title or "- GVIM"):
+        s = s.replace("'", r"'\''")
-        raise Exception("Failed to switch to GVim window")
+        cmd = "screen -x %s -X stuff '%s'" % (self.session, s)
-    time.sleep(1)
+        if sys.version_info >= (3,0):
+            cmd = cmd.encode("utf-8")
+        os.system(cmd)
 
-def is_focused(title=None):
+class VimInterfaceWindows(VimInterface):
-    cur_title = win32gui.GetWindowText(win32gui.GetForegroundWindow())
+    BRACES = re.compile("([}{])")
-    if (title or "- GVIM") in cur_title:
+    WIN_ESCAPES = ["+", "^", "%", "~", "[", "]", "<", ">", "(", ")"]
-        return True
+    WIN_REPLACES = [
-    return False
-
-BRACES = re.compile("([}{])")
-WIN_ESCAPES = ["+", "^", "%", "~", "[", "]", "<", ">", "(", ")"]
-WIN_REPLACES = [
             (BS, "{BS}"),
             (ARR_L, "{LEFT}"),
             (ARR_R, "{RIGHT}"),
@@ -100,65 +104,53 @@ WIN_REPLACES = [
             ("`", "`_{BS}"),
             ("´", "´_{BS}"),
             ("{^}", "{^}_{BS}"),
-]
+    ]
-def convert_keys(keys):
+
-    keys = BRACES.sub(r"{\1}", keys)
+    def __init__(self):
-    for k in WIN_ESCAPES:
+        self.seq_buf = []
+        # import windows specific modules
+        import win32com.client, win32gui
+        self.win32gui = win32gui
+        self.shell = win32com.client.Dispatch("WScript.Shell")
+
+    def is_focused(self, title=None):
+        cur_title = self.win32gui.GetWindowText(self.win32gui.GetForegroundWindow())
+        if (title or "- GVIM") in cur_title:
+            return True
+        return False
+
+    def focus(self, title=None):
+        if not self.shell.AppActivate(title or "- GVIM"):
+            raise Exception("Failed to switch to GVim window")
+        time.sleep(1)
+
+    def convert_keys(self, keys):
+        keys = self.BRACES.sub(r"{\1}", keys)
+        for k in self.WIN_ESCAPES:
             keys = keys.replace(k, "{%s}" % k)
-    for f, r in WIN_REPLACES:
+        for f, r in self.WIN_REPLACES:
             keys = keys.replace(f, r)
         return keys
 
-SEQ_BUF = []
+    def send(self, keys):
-def send_win(keys, session):
+        self.seq_buf.append(keys)
-    global SEQ_BUF
+        seq = "".join(self.seq_buf)
-    SEQ_BUF.append(keys)
-    seq = "".join(SEQ_BUF)
 
         for f in SEQUENCES:
             if f.startswith(seq) and f != seq:
                 return
-    SEQ_BUF = []
+        self.seq_buf = []
 
-    seq = convert_keys(seq)
+        seq = self.convert_keys(seq)
 
-    if not is_focused():
+        if not self.is_focused():
             time.sleep(2)
-        focus()
+            self.focus()
-    if not is_focused():
+        if not self.is_focused():
             # This is the only way I can find to stop test execution
             raise KeyboardInterrupt("Failed to focus GVIM")
 
-    shell.SendKeys(seq)
+        self.shell.SendKeys(seq)
-
-################ end windows ################
-
-def send_screen(s, session):
-    s = s.replace("'", r"'\''")
-    cmd = "screen -x %s -X stuff '%s'" % (session, s)
-    if sys.version_info >= (3,0):
-        cmd = cmd.encode("utf-8")
-    os.system(cmd)
-
-
-def send(s, session):
-    if WIN:
-        send_win(s, session)
-    else:
-        send_screen(s, session)
-
-def focus(title=None):
-    if WIN:
-        focus_win(title=title)
-
-def send_keystrokes(str, session, sleeptime):
-    """
-    Send the keystrokes to vim via screen. Pause after each char, so
-    vim can handle this
-    """
-    for c in str:
-        send(c, session)
-        time.sleep(sleeptime)
 
 class _VimTest(unittest.TestCase):
     snippets = ("dummy", "donotdefine")
@@ -176,7 +168,7 @@ class _VimTest(unittest.TestCase):
     skip_on_mac = False
 
     def send(self,s):
-        send(s, self.session)
+        self.vim.send(s)
 
     def send_py(self,s):
         if sys.version_info < (3,0):
@@ -185,7 +177,7 @@ class _VimTest(unittest.TestCase):
             self.send(":py3 << EOF\n%s\nEOF\n" % s)
 
     def send_keystrokes(self,s):
-        send_keystrokes(s, self.session, self.sleeptime)
+        self.vim.send_keystrokes(s, self.sleeptime)
 
     def check_output(self):
         wanted = self.text_before + '\n\n' + self.wanted + \
@@ -2924,40 +2916,45 @@ if __name__ == '__main__':
     test_loader = unittest.TestLoader()
     all_test_suites = test_loader.loadTestsFromModule(__import__("test"))
 
-    focus()
+    if platform.system() == "Windows":
+        vim = VimInterfaceWindows()
+    else:
+        vim = VimInterfaceScreen(options.session)
+
+    vim.focus()
 
     # Ensure we are not running in VI-compatible mode.
-    send(""":set nocompatible\n""", options.session)
+    vim.send(""":set nocompatible\n""")
 
     # Do not mess with the X clipboard
-    send(""":set clipboard=""\n""", options.session)
+    vim.send(""":set clipboard=""\n""")
 
     # Set encoding and fileencodings
-    send(""":set encoding=utf-8\n""", options.session)
+    vim.send(""":set encoding=utf-8\n""")
-    send(""":set fileencoding=utf-8\n""", options.session)
+    vim.send(""":set fileencoding=utf-8\n""")
 
     # Tell vim not to complain about quitting without writing
-    send(""":set buftype=nofile\n""", options.session)
+    vim.send(""":set buftype=nofile\n""")
 
     # Ensure runtimepath includes only Vim's own runtime files
     # and those of the UltiSnips directory under test ('.').
-    send(""":set runtimepath=$VIMRUNTIME,.\n""", options.session)
+    vim.send(""":set runtimepath=$VIMRUNTIME,.\n""")
 
     # Set the options
-    send(""":let g:UltiSnipsExpandTrigger="<tab>"\n""", options.session)
+    vim.send(""":let g:UltiSnipsExpandTrigger="<tab>"\n""")
-    send(""":let g:UltiSnipsJumpForwardTrigger="?"\n""", options.session)
+    vim.send(""":let g:UltiSnipsJumpForwardTrigger="?"\n""")
-    send(""":let g:UltiSnipsJumpBackwardTrigger="+"\n""", options.session)
+    vim.send(""":let g:UltiSnipsJumpBackwardTrigger="+"\n""")
-    send(""":let g:UltiSnipsListSnippets="@"\n""", options.session)
+    vim.send(""":let g:UltiSnipsListSnippets="@"\n""")
 
     # Now, source our runtime
-    send(":so plugin/UltiSnips.vim\n", options.session)
+    vim.send(":so plugin/UltiSnips.vim\n")
     time.sleep(2) # Parsing and initializing UltiSnips takes a while.
 
     # Inform all test case which screen session to use
     suite = unittest.TestSuite()
     for s in all_test_suites:
         for test in s:
-            test.session = options.session
+            test.vim = vim
             test.interrupt = options.interrupt
             if len(selected_tests):
                 id = test.id().split('.')[1]