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从键盘到字符

关于键盘改键的知识。

软件版

Preliminaries

keyboard:

find id of touchpad:

xinput list | grep -i "Touchpad" | awk '{print $6}' | sed 's/[^0-9]//g'

Warning

does not work

```xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ERAZER N500 Pro Mouse id=9 [slave pointer (2)]
⎜ ↳ GXTP7863:00 27C6:01E0 id=10 [slave pointer (2)]
⎜ ↳ GXTP7863:00 27C6:01E0 id=11 [slave pointer (2)]
⎜ ↳ test Keyboard id=15 [slave pointer (2)]
⎜ ↳ ZMK Project reviung Keyboard id=8 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Video Bus id=6 [slave keyboard (3)]
↳ Power Button id=7 [slave keyboard (3)]
↳ Huawei WMI hotkeys id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ test Keyboard id=16 [slave keyboard (3)]
↳ ZMK Project reviung Keyboard id=14 [slave keyboard (3)]

it does not recognize `Touchpad`

`xev`: find keycode; `xmodmap`: define keysym for each keycode (`xkeycaps` gui); `setxkbmap`: set keyboard layout; `xcape`: use a modifier as another key.

for example, <kbd>caps</kbd> as <kbd>escape</kbd> and <kbd>ctrl</kbd>

```sh
setxkbmap -option ctrl:swapcaps # swap ctrl and caps
setxkbmap -option ctrl:nocaps
xcape -e 'Alt_L=Escape' # Escape when tap, ALt when hold
# I usually use following
setxkbmap -option 'caps:ctrl_modifier' # caps become ctrl
xcape -e 'Caps_Lock=Escape'

usage of xmodmap:

modifier for X Window. mod1: left Alt, mod2: Num_Lock，mod3: no，mod4: Left Super (windows)，mod5: Shift

```xmodmap -pm

xmodmap: up to 4 keys per modifier, (keycodes in parentheses):

shift Shift_L (0x32), Shift_R (0x3e)
lock Caps_Lock (0x42)
control Control_L (0x25), Control_R (0x69)
mod1 Alt_L (0x40), Alt_R (0x6c), Alt_L (0xcc), Meta_L (0xcd)
mod2 Num_Lock (0x4d)
mod3 ISO_Level5_Shift (0xcb), Hyper_L (0xcf)
mod4 Super_L (0x85), Super_R (0x86), Super_L (0xce)
mod5 ISO_Level3_Shift (0x5c)

Keycode is what the kernal get, and keysym is what it gives. Each keysym column in the table corresponds to a particular combination of modifier keys:

1. Key
2. Shift+Key
3. Mode_switch+Key
4. Mode_switch+Shift+Key
5. ISO_Level3_Shift+Key
6. ISO_Level3_Shift+Shift+Key

check current keycode map:
```xmodmap -pke

keycode   8 =
keycode   9 = Escape NoSymbol Escape
keycode  10 = 1 exclam 1 exclam
keycode  11 = 2 at 2 at
keycode  12 = 3 numbersign 3 numbersign
keycode  13 = 4 dollar 4 dollar
keycode  14 = 5 percent 5 percent
keycode  15 = 6 asciicircum 6 asciicircum
keycode  16 = 7 ampersand 7 ampersand
keycode  17 = 8 asterisk 8 asterisk
keycode  18 = 9 parenleft 9 parenleft
keycode  19 = 0 parenright 0 parenright
...
keycode  34 = bracketleft braceleft bracketleft braceleft
keycode  35 = bracketright braceright bracketright braceright
keycode  36 = Return NoSymbol Return
keycode  37 = Control_L NoSymbol Control_L
keycode  38 = a A a A
keycode  39 = s S s S
keycode  40 = d D d D
keycode  41 = f F f F
keycode  42 = g G g G
keycode  43 = h H h H
keycode  67 = F1 F1 F1 F1 F1 F1 XF86Switch_VT_1
keycode  68 = F2 F2 F2 F2 F2 F2 XF86Switch_VT_2
...

ref

another softwares:
- interception-tools with plugins
- dual-function-keys (like Mod-Tap feature of zmk and qmk)
- caps2esc
- space2meta
- keyd: this is sick.

Reference