allow splitting panes horizontally

Author: tek

libtmux/pane.py

@@ -104,17 +104,20 @@ def reset(self):
 
         self.cmd('send-keys', '-R \; clear-history')
 
-    def split_window(self, attach=False):
+    def split_window(self, attach=False, vertical=True):
         """Split window at pane and return newly created :class:`Pane`.
 
         :param attach: Attach / select pane after creation.
         :type attach: bool
+        :param vertical: split vertically
+        :type vertical: bool
         :rtype: :class:`Pane`.
 
         """
         return self.window.split_window(
             target=self.get('pane_id'),
-            attach=attach
+            attach=attach,
+            vertical=vertical
         )
 
     def set_width(self, width):

libtmux/window.py

@@ -346,7 +346,8 @@ def split_window(
             self,
             target=None,
             start_directory=None,
-            attach=True
+            attach=True,
+            vertical=True
     ):
         """Split window and return the created :class:`Pane`.
 
@@ -372,6 +373,8 @@ def split_window(
         :type start_directory: string
         :param target: ``target_pane`` to split.
         :type target: bool
+        :param vertical: split vertically
+        :type vertical: bool
 
         :rtype: :class:`Pane`
 
@@ -390,6 +393,11 @@ def split_window(
         else:
             tmux_args += ('-t%s' % self.panes[0].get('pane_id'),)
 
+        if vertical:
+            tmux_args += ('-v',)
+        else:
+            tmux_args += ('-h',)
+
         tmux_args += (
             '-P', '-F%s' % ''.join(tmux_formats)  # output
         )