Closes issue SublimeText#71

- Adds AutoSwitchPane EventListener to auto-group files by syntax

Origami.sublime-settings

@@ -1,4 +1,22 @@
 {
+    /**
+     * The "syntax_grouping" key determines if you want
+     * Origami to attempt to group files with the same syntax
+     * into the same pane. The default if "false".
+     *
+     * The "enabled_syntaxes" key holds a list of syntaxes
+     * that qualify for grouping. Each syntax should be entered as
+     * a string. A blank list means all syntaxes qualify. If you are
+     * unsure of the correct syntax name, you can open the Sublime console
+     * and enter the following command:
+     *   sublime.active_window().active_view().settings().get('syntax')
+     * The name of the tmLanguage file is what you want.
+     * Ex// ["json", "python"]
+    */
+    "syntax_grouping": false,
+    "enabled_syntaxes": [],
+
+
     /**
      * The "saved_layouts" key holds a list of previously
      * saved layout settings. These can be set using the

README.markdown

@@ -42,6 +42,8 @@ You can have Origami automatically zoom the active pane by setting `origami_auto
 
 Origami can also automatically close a pane for you once you've closed the last file in it. Just set `origami_auto_close_empty_panes` to true in your user preferences.
 
+Origami can also automatically move files of the same syntax into the same pane group when opening them. Set `syntax_grouping` to `true` in your user or project settings. If you only want specific syntax types to be automatically grouped, you can selectively enable them using the `enabled_syntaxes` list in your user or project settings. (If you don't know the syntax name to use, you can open the Sublime console with <kbd>CTRL</kbd>+<kbd>~</kbd> and type `sublime.active_window().active_view().settings().get('syntax')`. Copy the name of the _tmLanguage_ file without the path parameters.
+
 Install
 -------
 

origami.py

@@ -1,6 +1,7 @@
 from __future__ import division
 import sublime, sublime_plugin
 import copy
+import os
 from functools import partial
 
 XMIN, YMIN, XMAX, YMAX = list(range(4))
@@ -62,6 +63,27 @@ def fixed_set_layout_no_focus_change(window, layout):
 	active_group = window.active_group()
 	window.set_layout(layout)
 
+def get_setting(view, key, default=None):
+    """
+    Get a Sublime Text setting value, starting in the project-specific
+    settings file, then the user-specific settings file, and finally
+    the package-specific settings file. Also accepts an optional default.
+    """
+    try:
+        settings = view.settings()
+        if settings.has('Origami'):
+            s = settings.get('Origami').get(key)
+            if s and len(s) > 0:
+                return s
+            else:
+                pass
+        else:
+            pass
+    except:
+        pass
+    global_settings = sublime.load_settings('Origami.sublime-settings')
+    return global_settings.get(key, default)
+
 class PaneCommand(sublime_plugin.WindowCommand):
 	"Abstract base class for commands."
 
@@ -763,3 +785,29 @@ def on_activated(self, view):
 		self.running = True
 
 		sublime.set_timeout(lambda: self.delayed_zoom(view, fraction), 0)
+
+class AutoSwitchPane(sublime_plugin.EventListener):
+	def get_syntax_name(self, view):
+		syntax_path = view.settings().get('syntax')
+		syntax_name = os.path.splitext(os.path.basename(syntax_path))[0].lower()
+		return syntax_name
+
+	def on_load(self, view):
+		syntax_grouping = get_setting(view, 'syntax_grouping')
+		enabled_syntaxes = [s.lower() for s in get_setting(view, 'enabled_syntaxes')]
+
+		if syntax_grouping:
+			w = sublime.active_window()
+			view = w.active_view()
+			views = w.views()
+			current_syntax = self.get_syntax_name(view)
+
+			if views and (len(enabled_syntaxes) == 0 or current_syntax in enabled_syntaxes):
+				for v in views:
+					syntax = self.get_syntax_name(v)
+					group = w.get_view_index(v)[0]
+
+					if syntax and syntax == current_syntax:
+						w.set_view_index(view, group, 0)
+						w.focus_view(view)
+