This quick-and-dirty project is taking longer than I had hoped, and I have to get this post out! I am working on a little shell script daemon that will re-run alttab when I change inputs on one of my monitors, so alttab is always visible on the screen.
This is a preview of the fully-fleshed-out project (Makefile, xdg autostart entry, etc.). Here is file fix-alttab
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#!/bin/sh
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# File: fix-alttab
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# Location: /usr/libexec/fix-alttab
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# Author: bgstack15
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# Startdate: 2023-07-10-2 08:10
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# Title: fix-alttab
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# History:
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# Usage:
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# called by fix-alttab-daemon
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# Reference:
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# https://unix.stackexchange.com/questions/537529/how-do-i-get-xdg-config-home-from-a-shell-script-command-line
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# Improve:
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# Dependencies:
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# xrandr, awk
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# Documentation: README.md
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# load settings
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test -f /etc/bgscripts/fix-alttab.conf && . /etc/bgscripts/fix-alttab.conf
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test -f "${XDG_CONFIG_HOME:-~/.config}/fix-alttab" && . "${XDG_CONFIG_HOME:-~/.config}/fix-alttab"
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# just in case no settings defined there
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test -z "${ALTTAB_COMMON}" && ALTTAB_COMMON="alttab -w 1 -theme numix-circle"
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test -z "${ALTTAB_LEFTYES_RIGHTYES}" && ALTTAB_LEFTYES_RIGHTYES=""
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test -z "${ALTTAB_LEFTNO_RIGHTYES}" && ALTTAB_LEFTNO_RIGHTYES="-vp 1920x1080+1920+0"
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test -z "${ALTTAB_LEFTYES_RIGHTNO}" && ALTTAB_LEFTYES_RIGHTNO="" #unsupported
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test -z "${ALTTAB_LEFTNO_RIGHTNO}" && ALTTAB_LEFTNO_RIGHTNO="" # unsupported
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# for better security, strip out any semicolons from these values because we evaluate without quotes
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_strip() {
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printf '%s' "${@}" | sed -r -e 's/;.*$//;'
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}
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ALTTAB_COMMON="$( _strip "${ALTTAB_COMMON}" )"
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ALTTAB_LEFTYES_RIGHTYES="$( _strip "${ALTTAB_LEFTYES_RIGHTYES}" )"
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ALTTAB_LEFTNO_RIGHTYES="$( _strip "${ALTTAB_LEFTNO_RIGHTYES}" )"
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ALTTABLEFTYES_RIGHTNO="$( _strip "${ALTTABLEFTYES_RIGHTNO}" )"
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ALTTAB_LEFTNO_RIGHTNO="$( _strip "${ALTTAB_LEFTNO_RIGHTNO}" )"
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# always evaluate this
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_ALTTAB_COMMAND_TO_KILL="$( echo "${ALTTAB_COMMON}" | awk '{print $1}' )"
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# main
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# set environment variables "left" and "right" to yes or no, to indicate if monitor is there.
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unset right left
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eval $( xrandr | awk 'BEGIN{a[0]="no";a[1]="yes"}/HDMI-1/{if($2~/\<connected/){r=1;}else{r=0};} /HDMI-0/{if($2~/\<connected/){l=1;}else{l=0;};} END{print "right="a[r];print "left="a[l];}' )
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unset _ALTTAB_PARAMS
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case "${left}${right}" in
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yesyes)
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printf '%s\n' "Using left yes, right yes"
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_ALTTAB_PARAMS="${ALTTAB_LEFTYES_RIGHTYES}"
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;;
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noyes)
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printf '%s\n' "Using left no, right yes"
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_ALTTAB_PARAMS="${ALTTAB_LEFTNO_RIGHTYES}"
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;;
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yesno)
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printf '%s\n' "Using left no, right yes"
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_ALTTAB_PARAMS="${ALTTAB_LEFTNO_RIGHTYES}"
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;;
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nono)
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printf '%s\n' "Using left no, right no: UNSUPPORTED!"
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_ALTTAB_PARAMS="${ALTTAB_LEFTNO_RIGHTNO}"
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;;
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*)
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printf '%s\n' "Unknown config: leftright \"${left}${right}\". Aborted." 1>&2 ; exit 1
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;;
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esac
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test -n "${APPLY}" && {
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test -n "${DEBUG}" && set -x
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killall "${_ALTTAB_COMMAND_TO_KILL}"
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# unquoted here:
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${ALTTAB_COMMON} ${_ALTTAB_PARAMS} &
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set +x
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}
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File fix-alttab-daemon which gets called by ~/.fluxbox/startup or with an entry in directory /etc/xdg/autostart/.
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#!/bin/sh
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# File: fix-alttab-daemon
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# Location: /usr/bin
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# Author: bgstack15
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# Startdate: 2023-07-10-2 08:55
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# SPDX-License-Identifier: GPL-3.0
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# Title: fix-alttab-daemon
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# Project: fix-alttab
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# Purpose: Detect changes to connected HDMI monitors
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# History:
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# Usage:
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# run in ~/.fluxbox/startup in the background
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# Reference:
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# Improve:
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# Dependencies:
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# plecho
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# fix-alttab
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# Documentation: README.md
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# load settings
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test -f /etc/bgscripts/fix-alttab.conf && . /etc/bgscripts/fix-alttab.conf
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test -f "${XDG_CONFIG_HOME:-~/.config}/fix-alttab" && . "${XDG_CONFIG_HOME:-~/.config}/fix-alttab"
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command -v plecho 1>/dev/null && _use_plecho=1
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unset _laststatus
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while ! test -f /tmp/stop-fix-alttab-daemon ;
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do
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sleep "${ALTTAB_DAEMON_LOOP:-3}"
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_status="$( APPLY= ./fix-alttab )"
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test "${_status}" != "${_laststatus}" && {
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APPLY=1 ./fix-alttab | \
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{
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test "${_use_plecho}" = "1" && timeout 2 plecho || cat
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}
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} | tee -a "${ALTTAB_DAEMON_LOGFILE:-fix-alttab-daemon.log}"
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_laststatus="${_status}"
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done
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And here is the config file. The above scripts read /etc/bgscripts/fix-alttab.conf first, and then ~/.config/fix-alttab.
# Example fix-alttab.conf
# Usage: dot-sourced by fix-alttab and its daemon
# Locations:
# /etc/bgscripts/fix-alttab.conf
# ~/.config/fix-alttab
ALTTAB_DAEMON_LOOP=3
ALTTAB_DAEMON_LOGFILE="${XDG_RUNTIME_DIR:~}/fix-alttab-daemon.log"
# First word here is the binary to run. This will be killalled if it needs to be run.
ALTTAB_COMMON="alttab -w 1 -theme numix-circle"
ALTTAB_LEFTYES_RIGHTYES=""
ALTTAB_LEFTNO_RIGHTYES="-vp 1920x1080+1920+0"
ALTTAB_LEFTYES_RIGHTNO="" # unsupported
ALTTAB_LEFTNO_RIGHTNO="" # unsupported
Yes, I'm in love with sleep loops. I aspire to be a Unix Master Foo.
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