iankelling.org Git - distro-setup/blob - laptop-xrandr

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23 set -e; . /usr/local/lib/bash-bear; set +e
  24
  25 xf=$(mktemp)
  26 xrandr >$xf
  27
  28 # eg eDP-1 connected primary
  29 laptop_out=$(awk '$3 == "primary" {print $1}' $xf)
  30 output=$(grep -E "^(HDMI|DP)[^ ]* connected [0-9]" $xf| awk '{print $1}' ||:)
  31
  32 edid() {
  33   card=$1
  34   sha256sum </sys/class/drm/$card/edid | grep -oE '^.{10}'
  35   }
  36
  37 restart=false
  38 left_right_arg=--right-of
  39 if [[ $output ]]; then
  40
  41   mode=$(grep -A1 -E "^$output" | tail -n1 | awk '{print $1}' $xf)
  42
  43   primary_res=$(awk '$2 == "connected" && $3 == "primary" { print $4 }' $xf | sed 's/+.*//')
  44   primary_x=${primary_res%x*}
  45
  46   x=${mode%x*}
  47   y=${mode#*x}
  48
  49   half_x=$(( x / 2 ))
  50
  51   x_offset=0
  52
  53   # identify monitors that are always on the left.
  54   if [[ $output == HDMI2 && $(edid card0-HDMI-A-2) == 192efbdcef ]] || \
  55        [[ $output == HDMI-1 && $(edid card1-HDMI-A-1 ) == 7c58f9ac1e ]]; then
  56     left_right_arg=--left-of
  57     x_offset=$primary_x
  58   fi
  59
  60   # some monitors need off then on to become active
  61   if $restart; then
  62     xrandr --output $output --off
  63     sleep 2
  64   fi
  65
  66
  67   # eg: 3840x2160
  68   echo mode=$mode
  69   xrandr --output $output $left_right_arg $laptop_out --mode $mode
  70
  71
  72   # This splits a monitor into 2 virtual screens, which makes it split
  73   # into 2 workspaces in i3, which is a much more convenient setup for
  74   # managing windows.
  75   # todo: add an option to turn this off
  76   # todo: do this on systems with just 1 monitor.
  77   #
  78   # /298 & 336 are millimeters. I took them from a monitor I was using. I
  79   # don't know if they are important, I assume not important enough to
  80   # change for different monitors.
  81   xrandr --setmonitor BIG-LEFT $half_x/298x$y/336+0+$x_offset $output
  82   xrandr --setmonitor BIG-RIGHT $half_x/298x$y/336+$(( x_offset + half_x ))+0 none
  83
  84
  85   for i in 2 3 4 5 6 7 8 9 10; do
  86     # if the workspace is already there, this will fail.
  87     # if the workspace doesn't exist yet, it fails with:
  88     # ERROR: No output matched
  89     i3-msg '[workspace="'$i'"]' move workspace to output $output ||:
  90   done
  91 else
  92   xrandr --auto
  93
  94 fi