[rc/{sway,X}] add custom keyboard layout, mapping Menu to Alt_R

back when i wasn't on wayland, i used to use xmodmap to remap the menu
key to right alt, xmodmap -e "keycode 135 = Alt_R", since, as it turns
out, setxkbmap doesn't have an option for that.

there being no xkb option for changing menu into right alt meant i was
stuck with it on sway, since setxkbmap is X-specific.

figuring out how to write my own xkb rules was "fun".  at first i did
a separate aminb file containing aminb:menu_ralt (à la altwin:menu);
but decided it would be simpler to just define my own us(basic)-based
layout and make all the changes there.

also, no need to map right control to right alt using ctrl:rctrl_ralt
anymore.

1 files changed, 14 insertions, 2 deletions

diff --git a/rc.org b/rc.org
index 654bd8e..c8c71bc 100644
--- a/rc.org
+++ b/rc.org
@@ -3827,8 +3827,8 @@ input "2:7:SynPS/2_Synaptics_TouchPad" {
 input "1:1:AT_Translated_Set_2_keyboard" {
     repeat_delay 200
     repeat_rate 45
-    xkb_layout us,ir
-    xkb_options ctrl:nocaps,altwin:swap_alt_win,ctrl:rctrl_ralt,grp:shifts_toggle
+    xkb_layout us_ab,ir
+    xkb_options ctrl:nocaps,altwin:swap_alt_win,grp:shifts_toggle
 }
 
 
@@ -5047,6 +5047,18 @@ URxvt.color7: #D3D7CF
 URxvt.color15: #EEEEEC
 #+end_src
 
+*** xkb us_ab keyboard layout
+
+#+begin_src conf :tangle "/sudo::/usr/share/X11/xkb/symbols/us_ab" :comments none
+default partial alphanumeric_keys
+xkb_symbols "us_ab" {
+    include "us(basic)"
+    name[Group1]= "English (US)(aminb)";
+
+    key <MENU> { [ Alt_R ] };
+};
+#+end_src
+
 ** XDG
 :PROPERTIES:
 :header-args+: :tangle ~/.config/user-dirs.dirs