80 lines
2.5 KiB
Plaintext
80 lines
2.5 KiB
Plaintext
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#!/bin/bash
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# epochMillis: print the amount of millis since epoch time on the std output stream.
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epochMillis(){
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echo $(($(date +%s%N)/1000000))
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}
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# queue: array holding the focused window ids in order, the most recent focus is on index 0.
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queue=( )
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queueLimit=8
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# pushOnQueue: insert a window id on index 0 of the queue. This function also removes the given id if was already present, the queue is an ordered set.
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# arg 1: window id to insert.
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pushOnQueue(){
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if [ "$1" = "0x0" ]
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then
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return
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fi
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newQueue=( "$1" )
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for i in "${queue[@]}"
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do
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if [ "$1" = "$i" ]
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then
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continue
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fi
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newQueue=( ${newQueue[@]:0} "$i" )
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done
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queue=( "${newQueue[@]:0:$queueLimit}" )
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}
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# markQueue: put i3 marks using the window ids stored on the queue. The windows are marked using "_prevFocusX" where X is a integer corresponding with the index of the element on the queue. The previously focused window (the most recent) is marked using "_prevFocus0". This function also cleans the queue from windows that can't be marked (e.g. windows that have been closed).
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markQueue(){
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queueCopy=( "${queue[@]}" )
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queue=( )
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j=0
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for i in "${queueCopy[@]}"
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do
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i3-msg "unmark _prevFocus$j" 1>/dev/null 2>&1
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if i3-msg "[id=$i] mark --add _prevFocus$j" 2>/dev/null | grep -i "\"success\":true" 1>/dev/null 2>&1
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then
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queue=( ${queue[@]:0} "$i" )
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j=$(($j + 1))
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fi
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done
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}
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lastTime=$(epochMillis)
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# permanence: period in millis used to determine if a window is worthy to be saved on the queue. This enables i3 window fast navigation without saving unworthy window ids.
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permanence=1000
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# main loop: read activated window ids continuously.
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xprop -root -spy _NET_ACTIVE_WINDOW |
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while read line
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do
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currentTime=$(epochMillis)
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period=$(($currentTime-$lastTime))
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lastTime=$currentTime
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# previousFocus: window id of the previously focused (activated) window.
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previousFocus=$currentFocus
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# currentFocus: window id of the window that has just being activated.
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currentFocus=$(echo "$line" | awk -F' ' '{printf $NF}')
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# push the previousFocus id to the queue if the time spent on the previous window was greater than permanence. Check also to allow fast switching between two windows.
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if [ $period -gt $permanence -o "$currentFocus" = "${queue[0]}" ]
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then
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pushOnQueue "$previousFocus"
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fi
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# if the currentFocus is marked as the previous window (_prevFocus0 or queue[0]) then swap the first two elements on the queue to allow switching.
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if [ "${queue[0]}" = "$currentFocus" ]
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then
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queue=( ${queue[1]} ${queue[0]} ${queue[@]:2} )
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fi
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markQueue
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done
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