Smart Caps Lock: Remap to Control AND Escape (Linux, Mac, Windows)

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    Smart Caps Lock: Remap to Control AND Escape (Linux, Mac, Windows)
把 Caps Lock 變成智慧的 Control 以及 Escape ：

單獨輕按一下就是 Escape 。
若按下時同時按著其他鍵，就會是 Control 。

這應該是 Vim 和 Emacs 的最佳解了！(Emacs? Bash 的快捷鍵就是 Emacs 系列的)

Send Escape if you tap Caps Lock alone.
Send Control if you press Caps Lock with another key.

For both Vim and Emacs world.
GNU/Linux
Step 1. Install XCAPE
Install XCAPE (xcape). (Linux utility to configure modifier keys to act as other keys when pressed and released on their own.)
Ubuntu:
sudo apt-get install xcape
Step 2. Run the command
# make CapsLock behave like Ctrl:
setxkbmap -option ctrl:nocaps

# make short-pressed Ctrl behave like Escape:
xcape -e 'Control_L=Escape'
The effect should apply immediately.
Step 3. Autostart
Append code from Step 2 to file ~/.xprofile to run the command when X starts.
macOS

Download and install Karabiner-Elements, a powerful and stable keyboard customizer.
Open Karabiner-Elements, select Complex Modifications tab, and click Add rule at the bottom.
Find Post escape if caps is pressed alone, left_ctrl otherwise and click on enable.

The effect should apply immediately.
Windows
Option 1:

Download and install AutoHotKey.
Use the script CapsLockCtrlEscape.ahk.

Option 2:
Download and run dual-key-remap. (Note that in config.txt, CONTROL might needed to changed to LEFT_CTRL for some computers)
For both options, the effect should apply immediately.