feat: zsh: Add Custom Widgets hack

[bezhermoso]

Summary

Widgets are functions that perform actions in the terminal and command-line buffer. You can define custom ones and bind them to key combinations.

What it achieves

• Create custom keyboard shortcuts that manipulate the command line
• Access and modify the command buffer programmatically
• Build personalized command-line workflows

Zsh Configuration

# 1. Define function
prepend-sudo() {
    if [[ $BUFFER != "sudo "* ]]; then
        BUFFER="sudo $BUFFER"
        zle end-of-line
    fi
}
# 2. Create widget
zle -N prepend-sudo
# 3. Bind hotkey
bindkey '^Xs' prepend-sudo

Key variables: $BUFFER, $LBUFFER, $RBUFFER, $CURSOR

Reference

• Original video: 10 Zsh Tips to Improve Productivity (14:04-15:19)

Additional Applications & Inspiration

• A User's Guide to the Z-Shell - Chapter 4
• Mastering Zsh: Widgets
• Zsh Line Editor Documentation
• Magnus919: Zsh Hidden Gems (2025)
• thevaluable.dev: Guide to the Zsh Line Editor
• sgeb.io: Creating custom widgets
• Gist: How to create user defined widget
• Gist: Standard ZLE widgets summary

[bezhermoso]

• Fix conflicts with existing key binds.