Use script to bind workspaces to primary/nonprimary displays

This was a bit janky (and so never made it off my desktop), but
necessary until 4.22, which added `output nonprimary`

.config/i3/config

@@ -4,12 +4,13 @@
 
 # variables for use later
 set $mod Mod4
-set $mon1 DP-0
-set $mon2 LVDS-0
 set $config_dir ~/.config/i3
 
 include include/`hostname`.conf
 
+exec_always $config_dir/monitor_workspaces.py
+include include/dynamic.conf
+
 ## Startup Applications ##
 exec --no-startup-id ~/.fehbg
 exec --no-startup-id xfce4-panel -d
@@ -210,29 +211,6 @@ bindsym --whole-window $mod+Shift+button1 mark --add quickswap; mode "swap-dest"
 bindsym $mod+Mod1+comma mark --add quickswap
 bindsym $mod+comma swap container with mark quickswap; [con_mark="quickswap"] focus; unmark quickswap
 
-# bind workspaces 1-10 to monitor 1, 11-20 to monitor 2
-workspace  1 output $mon1
-workspace  2 output $mon1
-workspace  3 output $mon1
-workspace  4 output $mon1
-workspace  5 output $mon1
-workspace  6 output $mon1
-workspace  7 output $mon1
-workspace  8 output $mon1
-workspace  9 output $mon1
-workspace 10 output $mon1
-
-workspace 11 output $mon2
-workspace 12 output $mon2
-workspace 13 output $mon2
-workspace 14 output $mon2
-workspace 15 output $mon2
-workspace 16 output $mon2
-workspace 17 output $mon2
-workspace 18 output $mon2
-workspace 19 output $mon2
-workspace 20 output $mon2
-
 # switch to workspace
 bindsym $mod+1 workspace number 1
 bindsym $mod+2 workspace number 2

.config/i3/monitor_workspaces.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+
+from pathlib import Path
+
+import i3ipc
+
+import Xlib.display
+from Xlib.ext import randr
+
+i3 = i3ipc.Connection()
+
+
+def iter_outputs():
+    display = Xlib.display.Display()
+    screen_root = display.screen().root
+    res = randr.get_screen_resources(screen_root)
+    primary_display_id = screen_root.xrandr_get_output_primary().output
+
+    for output in sorted(res.outputs, key=lambda o: o != primary_display_id):
+        params = display.xrandr_get_output_info(output, res.config_timestamp)
+        if not params.crtc:  # skip inactive
+            continue
+        yield params.name, output == primary_display_id
+
+
+def workspaces_for_output(name, primary):
+    if primary:
+        yield "# Primary Monitor"
+        workspaces = range(1, 11)
+    else:
+        yield "# Secondary Monitor"
+        workspaces = range(11, 21)
+
+    for workspace in workspaces:
+        yield f"workspace {workspace} output {name}"
+
+
+with open(Path(__file__).parent / "include/dynamic.conf", "w") as f:
+    f.write(
+        "\n\n".join(
+            "\n".join(workspaces_for_output(output, primary))
+            for output, primary in iter_outputs()
+        )
+    )
+    f.write("\n")
+
+
+# outputs = i3.get_outputs()
+
+
+# def workspaces_for_output(output: i3ipc.OutputReply):
+#     if output.primary:
+#         yield "# Primary Monitor"
+#         workspaces = range(1, 11)
+#     else:
+#         yield "# Secondary Monitor"
+#         workspaces = range(11, 21)
+
+#     for workspace in workspaces:
+#         yield f"workspace {workspace} output {output.name}"
+
+
+# with open(Path(__file__).parent / "include/dynamic.conf", "w") as f:
+#     f.write(
+#         "\n\n".join(
+#             "\n".join(workspaces_for_output(output))
+#             for output in sorted(outputs, key=lambda o: o.primary, reverse=True)
+#             if output.active
+#         )
+#     )
+#     f.write("\n")