Re: command on switching terminals?

[Mikael Magnusson <mikachu@xxxxxxxxx>]

On Sat, Jan 6, 2018 at 6:33 AM, Ray Andrews <rayandrews@xxxxxxxxxxx> wrote:
> Is it possible for zsh to know when the terminal in which it is running has
> awakened by having the mouse moved into that window?  I understand that it's
> the window manager that decides which terminal is active of course, but
> perhaps zsh knows when it is put to sleep by the mouse moving out of it's
> window, and also knows when it has been awakened again? I have a utility
> that lets you hotkey a mouse jump between terminals so as to jump between
> them without having to reach for the mouse itself, and I can call it fine
> within a function, but I'd like to be able to also execute some code after
> each jump but in the new window.  As it is, zsh just wakes up without
> seeming to know it's been asleep so there's nothing to 'attach' any commands
> to.  precmd() and preexec() are not aroused.   Any commands inside the
> calling function placed after the command to jump to the new terminal are
> executed in the old terminal, which is not surprising, so it would have to
> depend on the awakened terminal knowing it's been awakened.  Sorta like
> precmd but hooked to the activation of the terminal.  I understand that this
> might be outside of zsh's domain.

You can, yes. Note that if a program was running in the foreground,
zsh won't know if the terminal is active or not once that program
finishes though. I have never found a practical use for this.

# this might work for more terminals but i haven't tested, adjust as needed
# also check if you already have hooks for zle-line-init/finish and
adjust those as needed instead
# note also that leaving/entering a terminal will disable paste
hilighting when the following stuff is enabled
# These two hooks will enable and disable the terminal sending an
escape code to the terminal when it receives/loses focus, since most
programs won't handle them.
function _zle_line_init() {
  # enable focus events
  [[ $TERM == rxvt-unicode || $TERM = xterm ]] && printf '\e[?1004h'
}

function _zle_line_finish() {
  # disable focus events
  [[ $TERM == rxvt-unicode || $TERM = xterm ]] && printf '\e[?1004l'
}
zle -N zle-line-init _zle_line_init
zle -N zle-line-finish _zle_line_finish

# Handle FocusIn/Out events
bindkey '^[[I' focus-in
bindkey '^[[O' focus-out
# you can use two different functions too of course,
# i just happened to want the same thing to happen in both cases
# when i was testing this
zle -N focus-in _focus_handler
zle -N focus-out _focus_handler
function _focus_handler() {
  # $WIDGET will be focus-in when terminal receives
  # focus and focus-out when losing it, eg
  if [[ $WIDGET = focus-in ]]; then
    zle -M "hey we got focus"
  fi
}


-- 
Mikael Magnusson