A simple window switcher for sway.

Part of this code is derived from:
<https://github.com/tobiaspc/wofi-scripts>

Huge thanks to Tobi!

LICENSE

@@ -672,3 +672,26 @@ may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
+
+    Sections of this code is derived from covered under the MIT License
+    Copyright (c) 2020 Tobi <https://github.com/tobiaspc/wofi-scripts>
+    See source file for more information
+
+                            The MIT License
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

swayswitch

@@ -0,0 +1,127 @@
+#!/bin/python3
+"""A simple windowswitcher for sway"""
+# switch_window, get_windows and extract_nodes_iterative is derived from 
+# https://github.com/tobiaspc/wofi-scripts Copyright (c) 2020 Tobi which
+# is covered by the MIT License. However this program is licenced under
+# the GPLv3+ Copyright (c) 2020 Micke Nordin. See LICENSE file for details.
+
+import json
+import math
+import subprocess
+
+import wx
+
+
+class SwaySwitch(wx.Frame):  # pylint: disable=no-member
+    """Frame for the swayswitcher"""
+    def __init__(self, *args, **kw):  # pylint: disable=unused-argument
+        """Constructor"""
+        wx.Frame.__init__(self, None, title="", style=wx.STAY_ON_TOP)  # pylint: disable=no-member
+        # create a panel in the frame
+        self.pnl = wx.Panel(self)  # pylint: disable=no-member
+        # get windows from sway
+        windows = get_windows()
+        label_len = 20
+
+        # and create a sizer to manage the layout of child widgets
+        x_and_y = int(math.sqrt(len(windows)) + 0.5)
+        sizer = wx.GridSizer(x_and_y)  # pylint: disable=no-member
+        self.pnl.SetSizer(sizer)
+        for window in windows:
+            try:
+                label = window['window_properties']['class']
+            except KeyError:
+                try:
+                    label = window['app_id']
+                    if len(label) < label_len:
+                        label = label + ':' + window['name'][:label_len -
+                                                             len(label)]
+                except KeyError:
+                    label = window['name']
+                if len(label) > label_len:
+                    label = label[:label_len]
+            winid = window['id']
+            size = wx.Window.GetFont(self).GetPointSize() * label_len  # pylint: disable=no-member
+            btn = wx.Button(  # pylint: disable=no-member
+                parent=self.pnl,
+                id=winid,
+                label=label,
+                size=wx.Size(size, size))  # pylint: disable=no-member
+            btn.Bind(
+                wx.EVT_BUTTON,
+                lambda event, mwinid=winid: self.switch_window(event, mwinid))
+            sizer.Add(btn, 0, wx.ALIGN_CENTER)  # pylint: disable=no-member
+            # Set up esc keybinding
+            self.Bind(wx.EVT_CHAR_HOOK, lambda event: self.on_key_press(event))  # pylint: disable=unnecessary-lambda
+        sizer.Fit(self)
+        sizer.Layout()
+
+    def on_key_press(self, event):
+        """Intercept esc key press"""
+        keycode = event.GetUnicodeKey()
+        if keycode == wx.WXK_ESCAPE:  # pylint: disable=no-member
+            self.Close(True)
+        else:
+            event.Skip(True)
+
+    def switch_window(self, event, winid):  # pylint: disable=unused-argument
+        """Switches the focus to the given id"""
+        command = "swaymsg [con_id={}] focus".format(winid)
+        subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
+        self.Close(True)
+
+
+def get_windows():
+    """Returns a list of all json window objects"""
+    command = "swaymsg -t get_tree"
+    process = subprocess.Popen(command,
+                               shell=True,
+                               stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE)
+    data = json.loads(process.communicate()[0])
+
+    # Select outputs that are active
+    windows = []
+    for output in data['nodes']:
+
+        # The scratchpad (under __i3) is not supported
+        if output.get('name') != '__i3' and output.get('type') == 'output':
+            workspaces = output.get('nodes')
+            for workspace in workspaces:
+                if workspace.get('type') == 'workspace':
+                    windows += extract_nodes_iterative(workspace)
+    return windows
+
+
+def extract_nodes_iterative(workspace):
+    """Extracts all windows from a sway workspace json object"""
+    all_nodes = []
+
+    floating_nodes = workspace.get('floating_nodes')
+
+    for floating_node in floating_nodes:
+        all_nodes.append(floating_node)
+
+    nodes = workspace.get('nodes')
+
+    for node in nodes:
+
+        # Leaf node
+        if len(node.get('nodes')) == 0:
+            all_nodes.append(node)
+        # Nested node, handled iterative
+        else:
+            for inner_node in node.get('nodes'):
+                nodes.append(inner_node)
+
+    return all_nodes
+
+
+# Entry point
+if __name__ == "__main__":
+    # When this module is run (not imported) then create the app, the
+    # frame, show it, and start the event loop.
+    app = wx.App()
+    frm = SwaySwitch(None, title="")
+    frm.Show()
+    app.MainLoop()