TIL: Using ctrl-z to toggle between a program and the terminal

In almost any terminal program you can hit ctrl-z to pause it, then run fg to bring it back. With some zsh configuration you can make ctrl-z bring back the program too.

First, I tried doing what this Blog post suggested:

# .zshrc
# use ctrl-z to toggle in and out of bg
if [[ $- == *i* ]]; then
  stty susp undef
  bind '"\C-z":" fg\015"'
fi

But my system doesn't seem to support the bind command. Thus I ended up with:

# .zshrc
foreground() {
    fg
}

zle -N foreground
# use ctrl-z to toggle in and out of bg
if [[ $- == *i* ]]; then
  stty susp undef
  bindkey "^Z" foreground
fi

Which worked, but it didn't work from nvim which is where I thought I'd find it most useful. It turns out this is because I'm using Doom vim which disables crtrl-z in lua/doom/extras/keybindings/core.lua:

mappings.map("n", "<c-z>", "<Nop>", opts, "Editor", "disable_suspending", "Disable suspending")

Commenting out the offending line fixed me up nicely.

From: @Solene on Mastodon and Unix Stack Exchange: How to bind a keyboard shortcut in zsh to a program requiring stdin?