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#!/usr/bin/env bash
# a i3-like scratchpad for arbitrary applications.
#
# this lets a new monitor called "scratchpad" appear in from the top into the
# current monitor. There the "scratchpad" will be shown (it will be created if
# it doesn't exist yet). If the monitor already exists it is scrolled out of
# the screen and removed again.
#
# Warning: this uses much resources because herbstclient is forked for each
# animation step.
#
# If a tag name is supplied, this is used instead of the scratchpad
tag="${1:-scratchpad}"
hc() { "${herbstclient_command[@]:-herbstclient}" "$@" ;}
#scratchpad=(alacritty --title "$tag" --class "scratchpad")
scratchpad=(urxvt -title "$tag" -name "scratchpad")
#scratchpad=(xterm -title "$tag" -name "scratchpad")
read -r -a mrect < <(hc monitor_rect "")
monitor_w=${mrect[2]}
monitor_h=${mrect[3]}
monitor_w_offset=${mrect[0]}
monitor_h_offset=${mrect[1]}
scratchpad_scale_factor=0.75
scratch_w=$(printf "%d" "$(bc -l <<< "$monitor_w * $scratchpad_scale_factor")")
scratch_h=$(printf "%d" "$(bc -l <<< "$monitor_h * $scratchpad_scale_factor")")
scratch_w_offset=$(((monitor_w-scratch_w)/2))
scratch_h_offset=$(((monitor_h-scratch_h)/2))
rect=(
"$scratch_w"
"$scratch_h"
$((monitor_w_offset+scratch_w_offset))
$((monitor_h_offset+scratch_h_offset))
)
hc add "$tag"
monitor=scratchpad
exists=false
if ! hc add_monitor "$(printf "%dx%d%+d%+d" "${rect[@]}")" \
"$tag" "$monitor" 2> /dev/null ; then
exists=true
else
# remember which monitor was focused previously
hc chain \
, new_attr string monitors.by-name."$monitor".my_prev_focus \
, substitute M monitors.focus.index \
set_attr monitors.by-name."$monitor".my_prev_focus M
fi
show() {
[ "$(hc attr tags.by-name."$tag".client_count)" = "0" ] && hc spawn "${scratchpad[@]}"
hc lock
hc raise_monitor "$monitor"
hc focus_monitor "$monitor"
hc unlock
hc lock_tag "$monitor"
}
hide() {
# if q3terminal still is focused, then focus the previously focused monitor
# (that mon which was focused when starting q3terminal)
hc substitute M monitors.by-name."$monitor".my_prev_focus \
and + compare monitors.focus.name = "$monitor" \
+ focus_monitor M
hc remove_monitor "$monitor"
}
# shellcheck disable=SC2015
[ $exists = true ] && hide || show
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