Provide more actions for binding to keyboard shortcuts

[marcora]

It would be great to have more actions available for binding to keyboard shortcuts. Also, it would be nice to have a drop down to select among a few common keybinding schemes, e.g., Vim-like or Emacs/Bash-like.

For the latter, as an example, selecting the "Emacs/Bash-like" scheme from the dropdown would set the following actions to the following keyboard shortcuts:

CTRL+A / CTRL+E | Go to the start/end of the line
CTRL+U / CTRL+K | Delete from cursor to the start/end of the line
CTRL+W / ALT+D | Delete from cursor to start/end of word (whole word if at the boundary)
CTRL+X | Cut whole line and add to clipboard
CTRL+C | Copy whole line to clipboard
CTRL-V | Paste (insert) whole line from clipboard
CTRL-Y | Paste (replace) whole line from clipboard
CTRL+F / CTRL+B | Move forward/backward one character
META+F / META+B Move forward/backward one word (or go to start of word the cursor is currently on)
CTRL+D / CTRL+H | Delete character after/before under cursor
CTRL+N / CTRL+P | Move to next/previous line
CTRL+L | Delete everything

WIth META being Apple key on MacOS or Meta key on Windows/Linux

[marcora]

Given the similarities between Mercury and Sonic Pi, perhaps offering a similar scheme would help transitioning users from one system to the other.

[tmhglnd]

Thanks for this, I have not looked at all the keybinding options from Sonic Pi yet, also not sure if I want to have the same keybindings, but did include the option to jump words in the latest commit 07cf633 with alt-j and alt-l. But having the option to switch between different shortkey "presets" would be interesting to look at!

[tmhglnd]

Deleting characters (as opposite to backspace with delete key) is now included in 09f080c